Top Blockchain Companies & Developers in Stockholm

Ratings Updated: September 3, 2026

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11 Companies

Country: Sweden

City: Stockholm

List of the Top Stockholm Blockchain Development Companies

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Nextrope

5.0 18 reviews

Premier Verified

$25,000+

$50 - $99 / hr

10 - 49

Serves Stockholm, Sweden

Services provided

70% Blockchain

30% Custom Software Development

Nextrope is a Blockchain Development company specializing in Blockchain Solutions, Smart Contract Development, and Crypto Application Development. All reviews highlight their proactive approach, adaptability, and strong sense of ownership, with 100% positive feedback on their ability to align technological and business strategies effectively. Their expertise contributed to a 60% reduction in manual work and faster investment processes.

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Reviews mention Helpful
Nextrope has received overwhelmingly positive feedback for its helpfulness and responsiveness. Clients praised the team's effective communication, stating that project managers were always available and provided continuous feedback. For instance, one client noted the team's flexibility and readiness to assist, which significantly contributed to achieving project milestones. Another client highlighted that Nextrope acted not just as a development team but as a trusted technology partner, always offering valuable advice. Overall, the sentiment reflects strong satisfaction with Nextrope's support throughout the project lifecycle.

EIP-20 Ethereum Token for Web3 Solution Provider

5.0 Mar 12, 2022

The communication in the project was on a very high level, there was continuous feedback from both sides. The project manager was always up to date and was very helpful with our questions. We had weekly status calls with him but also we were in touch via Discord all the time.
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Software Development for Interim CFO Company

5.0 Jul 16, 2020

Nextrope was not only our development team but our technology partner. They are always helpful and ready to give advice.
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Average Project Cost Breakdown

$10,000 to $49,000 (10) Less than $10,000 (4) $50,000 to $199,999 (2)

What Clients Have Said
Nextrope is frequently noted for providing excellent value for money, with clients highlighting their cost-effectiveness relative to the quality of service delivered. For instance, one CEO mentioned selecting Nextrope for their 'good value for cost,' while another emphasized the 'high quality of work' achieved within a 'reasonable budget.' Overall, clients express strong satisfaction with Nextrope's pricing, describing their services as both affordable and of high quality, contributing to successful project outcomes.
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More responsive than most other service providers

Nextrope is very responsive
They are a great candidate to start a conversation with. Send them a short message or project inquiry.
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Poland (11) United Arab Emirates (2) Estonia (1) Norway (1) England (1)

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RedDuck

5.0 15 reviews

Verified

$5,000+

$50 - $99 / hr

10 - 49

Serves Stockholm, Sweden

Services provided

90% Blockchain

10% Web Development

RedDuck is a Blockchain Development company specializing in Distributed Ledger Technology, Smart Contract Development, and Decentralized Application (DApp) Development. Reviews highlight their strong project management skills and responsiveness, with 100% positive feedback on their ability to meet deadlines and adapt to client needs. Clients frequently commend their technical precision and strategic approach, ensuring high-quality deliverables.

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Reviews mention Communicative
Clients consistently praised RedDuck for their proactive communication and timely project management. One client noted, 'They have been super-active in terms of communication,' highlighting their commitment to daily updates and responsiveness. Another remarked, 'The communication is excellent, and things go smoothly,' emphasizing the team's ability to understand and implement client needs efficiently. Overall, the sentiment reflects a strong appreciation for RedDuck's communicative approach, contributing significantly to client satisfaction.

Web Development for Blockchain Game

5.0 Jan 27, 2022

The communication is excellent, and things go smoothly. We’re happier with RedDuck than with all the companies we’ve worked with in the past. We really like how they handle communication and deadlines. RedDuck works hard, and if they can’t get their stuff together, they work late in the night.
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Platform Development for Financial Services Company

5.0 Jul 31, 2023

RedDuck has been very proactive in communication with daily stand-ups and managers holding the junior devs responsible for the delivery timeline promised. They have also been super-active in terms of communication. The senior guys Mark & Dmytro really show care about the quality of the work their team delivers and step in as and when required.
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2 of 2 reviews are 5 stars

1 new review for Blockchain services

$50,000 – $199,999 avg. project cost

Reviewed 2 times in the past 6 months
In the last six months, RedDuck has received positive feedback for their project delivery and communication. Clients noted timely completion of projects, with one stating they appreciated RedDuck's attentiveness to needs and ability to meet deadlines. The COO of NYM Technologies praised their straightforward approach and value for cost, while the founder of Hypersimplex highlighted a strong cultural fit and satisfaction with their deliverables. Overall, client sentiment reflects high satisfaction with RedDuck's performance.
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Average Project Cost Breakdown

$50,000 to $199,999 (6) $10,000 to $49,000 (1)

What Clients Have Said
Clients consistently highlight RedDuck's competitive pricing and excellent value for money. For instance, one COO noted that they chose RedDuck for their 'good value for the cost,' while the CEO of InvariFi emphasized that their pricing fit the budget and offered 'great culture fit.' Overall sentiment reflects satisfaction with project outcomes delivered on time and within budget, reinforcing the perception of RedDuck as a reliable and cost-effective partner.
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$6,400 Allocation of an ethereum smart-contract developer $9,600 Allocation of a senior ethereum developer RWA/DeFi $12,800 Allocation of a tech-lead developer RWA/DeFi/Web3

Software Development (Ethereum/EVM)
Development of Blockchain/Web3 software focusing on smart-contracts / DeFi / RWA on Ethereum network.
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Slashdev

5.0 18 reviews

Verified

$5,000+

$50 - $99 / hr

10 - 49

Stockholm, Sweden

Services provided

10% Blockchain

20% Custom Software Development

20% Mobile App Development +4 services

20% Web Development

10% AI Development

10% E-Commerce Development

10% IT Staff Augmentation

Slashdev is a versatile software development company known for its expertise in web and mobile applications, including microservices and SaaS products. With approximately 90% positive feedback, clients frequently commend their technical prowess, swift project delivery, and effective communication. Notably, 70% of reviewers highlight their ability to quickly recruit specialized developers. However, some suggest improvements in early infrastructure planning and project portal integration.

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Reviews mention Transparent
Client feedback regarding Slashdev highlights a strong sentiment of transparency. One client noted the absence of 'gatekeeping,' allowing direct communication with developers, which fostered real-time iterations and accountability. Another client praised their 'care, attention to detail, and transparency,' emphasizing effective communication and quick responses. Overall, clients appreciate Slashdev's open approach, which enhances collaboration and mitigates misunderstandings, making them a recommended partner for complex projects.

Custom Software Dev for Luxury Footwear & Apparel Retailer

5.0 Jun 1, 2022

The company demonstrates an impressive level of care and attention to detail. Their transparency is impeccable, ensuring that clients are well-informed throughout the project. This approach fosters trust and confidence in their ability to deliver results.
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Web Development Services for Education Company

5.0 May 19, 2025

Project management was lean and effective. Michael was consistently attentive and quick to internalize requirements, and his updates were clear without adding process for process’s sake. We chose to manage most of the project ourselves, and Slashdev adapted seamlessly - no ticket-wall, no layers to wade through. We had direct, unfettered access to the developers, which let us iterate quickly and keep momentum. Milestones were delivered on or ahead of schedule, and when scope shifted, they flagged trade-offs early and helped re-prioritize so critical dates stayed intact. Response times were strong (same day for routine items; near-immediate for urgent issues), and they were proactive about risks and handoffs. The net effect: work got done, on time, with minimal ceremony.
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Web Development Services for Education Company

5.0 May 19, 2025

What stood out most is their no-gatekeeping model. Slashdev let us manage resources directly and never walled us off from the engineers doing the work. We set direction, spoke to developers in real time, and iterated fast - which is essential for a complex learning platform like ours. After dealing with the “PM → dev lead → dev → new dev” blame-game with our prior vendor, this level of transparency and access was a breath of fresh air. It eliminated misinterpretation, cut cycle time, and kept accountability crystal clear.
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England (4) United States (3) Sweden (2) Armenia (1) Brazil (1) Canada (1) Greece (1)

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Stockholm, Sweden

Mäster Samuelsgatan 36
Stockholm, Sweden 111 57
2 - 5

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Review Rating from Clients

5.0/5.0

Quality

5.0

Schedule

5.0

Cost

5.0

Willing to Refer

5.0

Reviewers in Stockholm commend Slashdev for their responsiveness, skilled developers, and effective project management. They appreciate the company's ability to handle complex app development tasks, ensuring timely delivery and ongoing support for their innovative digital solutions.
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ERRNA

4.8 2 reviews

$5,000+

< $25 / hr

1,000 - 9,999

Stockholm, Sweden

Services provided

60% Blockchain

10% Cybersecurity

10% Marketing Strategy +2 services

10% Mobile App Development

10% Web Design

ERRNA offers services including Blockchain Development, Smart Contract Development, and Decentralized Application (DApp) Development. The client feedback highlights ERRNA's ability to deliver secure and effective blockchain solutions on time and within budget. Clients appreciate their professionalism, project management, and the high quality of their developed applications.

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Industry Experience

ERRNA has received positive feedback primarily from the education industry, with clients highlighting their strengths in product development and project management. Their expertise in managing product roadmaps and backlog prioritization has been beneficial for educational platforms like MyTutor. Overall sentiment reflects strong satisfaction, particularly in communication and alignment with client values, making ERRNA a suitable choice for projects focused on educational technology and development.
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Education

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Average Project Cost Breakdown

$10,000 to $49,000 (1)

What Clients Have Said
Clients have expressed satisfaction with ERRNA's pricing structure, highlighting it as a good fit for their budget and noting the overall value for money. One client emphasized that the company aligned with their values and provided effective project management. Additionally, the quality of team communication and transparency was praised, reinforcing the perception of ERRNA as a cost-effective choice for product development needs.
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Stockholm, Sweden

61 Sandhamnsgatan
Stockholm, Sweden 115 28
2 - 5

+1-435-800-0086

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OpenGeeksLab

4.9 17 reviews

$10,000+

$25 - $49 / hr

50 - 249

Stockholm, Sweden

Services provided

30% Blockchain

30% Custom Software Development

20% Mobile App Development +1 service

20% Web Development

OpenGeeksLab is a blockchain development company specializing in integrating blockchain technology to enhance security, transparency, and efficiency. The company has received 100% positive feedback for its expertise in smart contract development and project management. Clients commend OpenGeeksLab for its professionalism and ability to tailor blockchain solutions to specific business needs, ensuring successful project delivery.

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Reviews mention Patient
OpenGeeksLab received high praise for their patience throughout the app development process. Clients noted the team's willingness to educate them on mobile app development, stating, "They were always patient in guiding us through the process." Additionally, the project manager maintained effective communication and demonstrated understanding, even during instances of repeated questions from the client. Overall, the sentiment reflects a strong appreciation for the team's patience and support, contributing positively to the project experience.

Mobile App Dev for MCQ & Aptitude Test Platform

5.0 Mar 30, 2018

He was also very patient in educating us on what app development entails. Working with a novice can be annoying at times, and although we occasionally repeated some obvious questions, they were always patient in guiding us through the process.
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Industry Experience

OpenGeeksLab has demonstrated expertise across various industries, including retail apparel and fashion, cryptocurrency, education, and business services. Clients consistently highlight the company's strengths in web and mobile application development, effective project management, and strong communication. Positive feedback emphasizes their ability to enhance user experience, increase sales, and deliver projects on time. Overall, OpenGeeksLab is well-suited for businesses seeking robust digital solutions in dynamic sectors such as e-commerce, technology, and education.
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Beauty & Cosmetics Logistics & Supply Chain Advertising & marketing Other Industry Education Software Business services

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Average Project Cost Breakdown

$10,000 to $49,000 (5) $50,000 to $199,999 (5)

What Clients Have Said
OpenGeeksLab is recognized for delivering strong value for money, with several clients highlighting their cost-effectiveness and quality of service. For instance, one client noted that their pricing fit the budget and provided great value, while another emphasized their flexibility and cost-efficiency compared to competitors. Overall, feedback reflects a positive sentiment regarding the company's pricing structure, with many clients expressing satisfaction with the outcomes relative to their investment.
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Canada (3) United States (2) England (2) France (1) United Arab Emirates (1) Ukraine (1)

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Blocksism

4.0 1 review

$5,000+

$25 - $49 / hr

Freelancer

Stockholm, Sweden

Services provided

80% Blockchain

10% Custom Software Development

10% Web Development

Blocksism is a blockchain development company specializing in creating smart contracts and utilizing Hyperledger technology. Reviews highlight their agility, responsiveness, and effective communication, with 100% of feedback emphasizing a successful prototype completion. Clients appreciate their competitive pricing, although suggestions include exploring frameworks beyond Ethereum. Overall, Blocksism delivers efficiently on niche blockchain solutions with a clear emphasis on client collaboration.

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Industry Experience

Blocksism has demonstrated expertise in the blockchain sector, particularly within the staffing and recruiting industry. Their strengths include effective communication, responsiveness, and agile project management, as noted in client feedback. They successfully developed a blockchain prototype using Hyperledger technology, validating all project requirements. Overall sentiment is positive, with clients appreciating their approachability and niche focus, although they could benefit from diversifying their technical frameworks beyond Ethereum.
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Other Industry

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Average Project Cost Breakdown

What Clients Have Said
Clients have expressed satisfaction with Blocksism's pricing, noting it as 'good' and reflecting strong value for money. One client mentioned spending $2,000 on a blockchain prototype, which met all validation goals. They appreciated Blocksism's responsiveness and adaptability to changing requirements, enhancing their overall experience. However, potential clients are advised to clarify costs and project scope upfront, and to consider starting with smaller projects to gauge the company’s capabilities.
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More Digital Studios Sweden AB

Not yet reviewed

$5,000+

$100 - $149 / hr

10 - 49

Stockholm, Sweden

Services provided

15% Blockchain

30% Digital Strategy

25% Advertising +3 services

10% AR/VR Development

10% UX/UI Design

10% Web Development

Headquartered in Piteå, Sweden and Stockholm, Sweden, More Digital Studios Sweden AB is a Digital Strategy company. Their services include Digital Strategy and Advertising.
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Stockholm, Sweden

7 Nybrogatan
Stockholm, Sweden 114 34
6 - 9

+46703983649

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Erlang Solutions

Not yet reviewed

$10,000+

Undisclosed

50 - 249

Stockholm, Sweden

Services provided

10% Blockchain

40% Custom Software Development

20% IT Strategy Consulting +4 services

10% IoT Development

10% Other Application Development

5% Computer Engineering

5% Mobile App Development

Erlang Solutions is a software development company. The London, England-based team specializes in Custom Software Development and IT strategy consulting.
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Stockholm, Sweden

Blekholmstorget 30 F
Stockholm, Sweden 111 64
21 - 30

+44 (0) 20 7456 1020

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skilledpeople.

Not yet reviewed

$10,000+

$100 - $149 / hr

2 - 9

Stockholm, Sweden

Services provided

40% Blockchain

40% Business Consulting

20% Digital Strategy

Skilledpeople. Is a small Blockchain company located in Stockholm, Sweden. Their services include Blockchain and Business Consulting.
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Clever Compliance

Not yet reviewed

Undisclosed

Undisclosed

2 - 9

Stockholm, Sweden

Services provided

40% Blockchain

60% Custom Software Development

Clever Compliance is a software development firm. Their small team is based in Stockholm, Sweden and Sollentuna, Sweden. Their services include Custom Software Development and Blockchain.
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Sierratech

5.0 1 review

$5,000+

$50 - $99 / hr

50 - 249

Stockholm, Sweden

Services provided

20% Blockchain

30% Web Development

20% AI Development +3 services

10% AR/VR Development

10% Custom Software Development

10% Low/No Code Development

Sierratech offers services in Blockchain Development, focusing on secure platform development, user interface creation, and cryptocurrency integration. Reviews highlight Sierratech's cutting-edge expertise in blockchain technology, exemplary project management, and robust security measures. Clients commend their proactive communication and tailored solutions, ensuring projects are delivered on time with high standards of quality and compliance.

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Inc Dev

Not yet reviewed

$1,000+

$25 - $49 / hr

10 - 49

Stockholm, Sweden

Services provided

17% Blockchain

17% Custom Software Development

17% UX/UI Design +3 services

17% Web Development

16% DevOps Managed Services

16% Mobile App Development

Inc Dev is a Stockholm, Sweden-based UX company. They focus on UX/UI Design and Custom Software Development.
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Dwellir

Not yet reviewed

Undisclosed

Undisclosed

10 - 49

Uppsala, Sweden

Services provided

100% Blockchain

Dwellir is a Blockchain company. The team is located in Uppsala, Sweden, and their services include Blockchain.
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Ability to deliver

Focus

Proven

Market Leaders

Emerging

Niche

Clutch Leaders Matrix

Rollover to see company insights or click a company below for more details.

1 ERRNA

2 OpenGeeksLab

3 Slashdev

4 Blocksism

A Clutch Leaders Matrix provides a broad view of the top-performing companies in a particular service or location. Each company featured in a Leaders Matrix is evaluated based on Focus and Ability to Deliver. The size of each circle indicates that company’s size.

By using verified reviews, focused service details, and real project data, the Leaders Matrix highlights companies that consistently deliver and stand out from the rest. Each company’s position is based on how well they focus on a service area and how consistently they deliver results, helping you make informed, confident decisions. Learn More

Focus (x-axis)

Focus accounts for a company’s specialization within a certain service.

Ability to Deliver (y-axis)

Ability to Deliver considers three criteria:

Client feedback and reviews
Work experience and previous projects
Market presence and reputation in the industry

List of the Top 4 Stockholm Blockchain Development Companies

ERRNA

$5,000+

< $25 / hr

1,000 - 9,999

Stockholm, Sweden

Ability to deliver

32.9/40.0

16.2/20 Reviews

9.7/10 Clients & Experience

7/10 Market Presence

Service focus

60% Blockchain

40% Other

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OpenGeeksLab

$10,000+

$25 - $49 / hr

50 - 249

Stockholm, Sweden

Ability to deliver

33.4/40.0

15.6/20 Reviews

10/10 Clients & Experience

7.8/10 Market Presence

Service focus

30% Blockchain

70% Other

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Slashdev

$5,000+

$50 - $99 / hr

10 - 49

Stockholm, Sweden

Ability to deliver

35.1/40.0

16.6/20 Reviews

10/10 Clients & Experience

8.5/10 Market Presence

Service focus

10% Blockchain

90% Other

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Blocksism

$5,000+

$25 - $49 / hr

Freelancer

Stockholm, Sweden

Ability to deliver

19.4/40.0

13/20 Reviews

1.8/10 Clients & Experience

4.6/10 Market Presence

Service focus

80% Blockchain

20% Other

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More Digital Studios Sweden AB

$5,000+

$100 - $149 / hr

10 - 49

Stockholm, Sweden

Ability to deliver

14.3/40.0

0/20 Reviews

9/10 Clients & Experience

5.3/10 Market Presence

Service focus

15% Blockchain

85% Other

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Erlang Solutions

$10,000+

Undisclosed

50 - 249

Stockholm, Sweden

Ability to deliver

12.2/40.0

0/20 Reviews

4.8/10 Clients & Experience

7.4/10 Market Presence

Service focus

10% Blockchain

90% Other

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skilledpeople.

$10,000+

$100 - $149 / hr

2 - 9

Stockholm, Sweden

Ability to deliver

8.4/40.0

0/20 Reviews

3.8/10 Clients & Experience

4.6/10 Market Presence

Service focus

40% Blockchain

60% Other

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Clever Compliance

Undisclosed

Undisclosed

2 - 9

Stockholm, Sweden

Ability to deliver

5.3/40.0

0/20 Reviews

0/10 Clients & Experience

5.3/10 Market Presence

Service focus

40% Blockchain

60% Other

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Sierratech

$5,000+

$50 - $99 / hr

50 - 249

Stockholm, Sweden

Ability to deliver

4.9/40.0

0/20 Reviews

0/10 Clients & Experience

4.9/10 Market Presence

Service focus

20% Blockchain

80% Other

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Inc Dev

$1,000+

$25 - $49 / hr

10 - 49

Stockholm, Sweden

Ability to deliver

6.1/40.0

0/20 Reviews

2.1/10 Clients & Experience

4/10 Market Presence

Service focus

17% Blockchain

83% Other

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Dwellir

Undisclosed

Undisclosed

10 - 49

Uppsala, Sweden

Ability to deliver

0/40.0

0/20 Reviews

0/10 Clients & Experience

0/10 Market Presence

Service focus

100% Blockchain

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Specialties

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Top Blockchain Companies & Developers in Stockholm

List of the Top Stockholm Blockchain Development Companies

Reviews mention Helpful

EIP-20 Ethereum Token for Web3 Solution Provider

Software Development for Interim CFO Company

Average Project Cost Breakdown

What Clients Have Said

Nextrope is very responsive

Reviews mention Communicative

Web Development for Blockchain Game

Platform Development for Financial Services Company

Reviewed 2 times in the past 6 months

Average Project Cost Breakdown

What Clients Have Said

Software Development (Ethereum/EVM)

Reviews mention Transparent

Custom Software Dev for Luxury Footwear & Apparel Retailer

Web Development Services for Education Company

Web Development Services for Education Company

Industry Experience

Select Industry to see insights

Average Project Cost Breakdown

What Clients Have Said

Reviews mention Patient

Mobile App Dev for MCQ & Aptitude Test Platform

Industry Experience

Select Industry to see insights

Average Project Cost Breakdown

What Clients Have Said

Industry Experience

Select Industry to see insights

Average Project Cost Breakdown

What Clients Have Said

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List of the Top 4 Stockholm Blockchain Development Companies

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Specialties