Top Blockchain Companies & Developers in Stockholm

Ratings Updated: March 14, 2026

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4 Leaders 7 Contenders

11 Companies

Country: Sweden

City: Stockholm

List of the Top Stockholm Blockchain Development Companies

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RedDuck

5.0 13 reviews
Verified

$10,000+

$50 - $99 / hr

10 - 49

Serves Stockholm, Sweden

Services provided

100% Blockchain

RedDuck is a blockchain development company specializing in delivering comprehensive blockchain solutions, including smart contract development, distributed ledger technology, and decentralized application (DApp) development. Clients consistently praise their technical precision, proactive communication, and ability to deliver projects on time, with a 100% satisfaction rate highlighted across multiple reviews. Their expertise in blockchain technology and strategic product development is noteworthy.

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Reviews mention Open to feedback
The reviews consistently highlight RedDuck's openness to feedback and adaptability. Clients noted their quick responses to inquiries and willingness to implement changes, with one client stating, "When I gave RedDuck negative feedback, I never got excuses... I got adjusted behavior." Another emphasized their transparent communication and responsiveness to evolving requirements, stating, "Our feedback was always taken into account, and changes were implemented quickly." Overall, the sentiment is highly positive, reflecting a strong alignment with client needs.

Custom Software Development for Blockchain Company

5.0 Mar 18, 2022

When I gave RedDuck negative feedback, I never got excuses from them — I got adjusted behavior. They were able to take criticism from us and adjust their approach versus blaming the circumstance. RedDuck is on the right track; they should keep doing what they’re doing, and I’m sure they’ll be incredible in a few years.
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Cryptocurrency & Blockchain Dev for Asset Tokenization Co

5.0 Apr 21, 2025

Always quick response to questions, very open to changes and suggestions. Excellent project management.
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Blockchain Development for FinTech Company

5.0 Apr 23, 2025

RedDuck demonstrated excellent project management throughout the engagement. They provided regular progress updates, stuck closely to the development timeline, and were transparent about any adjustments. Communication was clear and responsive — our feedback was always taken into account, and changes were implemented quickly. Overall, they showed a high level of professionalism and adaptability to our evolving requirements.
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5 of 5 Blockchain reviews are 5 stars

2 new reviews for Blockchain in past 6 months

$50,000 – $199,999 avg. project cost

Blockchain PROJECT HIGHLIGHT

Blockchain Development for FinTech Company
5.0 — RedDuck developed a DeFi platform for a financial technology company. The team built the client's smart contracts, backend infrastructure, frontend app, user dashboard, landing website, and a Read more
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Industry Experience

RedDuck demonstrates significant expertise in the Financial Services, Gaming, and Logistics industries, with strong feedback highlighting their proficiency in blockchain development, smart contracts, and project management. Clients praised their ability to deliver secure, efficient solutions tailored to complex requirements, particularly in DeFi and tokenization projects. Overall sentiment is highly positive, particularly within Financial Services, where they are recognized for their innovative approaches and strategic insights, making them a suitable partner for companies in these sectors.
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Financial services Other Industry Logistics & Supply Chain Gaming

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Average Project Cost Breakdown

$50,000 to $199,999 (5) $10,000 to $49,000 (1)

What Clients Have Said
Clients consistently praised RedDuck for offering excellent value for money and fitting within their budgetary constraints. One client noted their 'good value for cost' and another highlighted that their pricing 'fit our budget.' Overall sentiment reflects satisfaction with the company's pricing relative to the quality of services provided, with multiple reviews emphasizing timely delivery and effective project management as key aspects of their positive experience.
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Slashdev

5.0 18 reviews

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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 and recruitment company specializing in web and mobile application development, as well as providing skilled developers for clients’ specific project needs. Overall, the feedback is highly positive, with approximately 90% of reviews highlighting their efficiency, strong project management, and technical expertise. Clients commend their quick recruitment process and flexibility, although some suggest improvements in deliverables clarity and payment systems.

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Reviews mention Reasonable pricing
Clients have reported a positive sentiment regarding Slashdev's pricing, describing it as "fair" and "impressive." One client noted that the company felt reasonable in their pricing structure while hiring a senior engineer, emphasizing the value provided. Another client, the CEO of a startup, highlighted their pricing as a significant positive aspect of the partnership. Overall, the feedback reflects satisfaction with the cost-effectiveness of their services.

Dev Staff Augmentation for Software Development Company

5.0 Apr 5, 2023

Hired a very competent developer in just three days, for a fair rate.
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Mobile App Dev & Staff Augmentation for Banking Company

5.0 Sep 26, 2022

They also felt very fair in their pricing.
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Web Design for Staffing & Selection Company

4.5 Jun 29, 2022

Their price is impressive.
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2 of 2 reviews are 5 stars

$10,000 – $49,000 avg. project cost

Reviewed 2 times in the past 6 months
In the past six months, client feedback for Slashdev has been overwhelmingly positive. Reliable Storage noted a 50% reduction in onboarding time and a 15% increase in Google reviews, praising Slashdev's strong project management and flexibility. College Prep System highlighted the successful refactoring of 90% of their codebase, emphasizing the team's ownership and efficient communication. While some clients suggested clearer deliverables and early infrastructure planning, overall sentiment reflects satisfaction and a strong recommendation for future collaborations.
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Industry Experience

Slashdev has demonstrated expertise across various industries, including Education, Information Technology, Software, Healthcare, Business Services, Real Estate, and Retail. Clients consistently commend their ability to refactor complex codebases, develop mobile applications, and recruit specialized talent efficiently. The feedback is overwhelmingly positive, highlighting strengths in project management, communication, and adaptability. Their impact is particularly noted in improving operational efficiencies and enhancing user experiences, making them a strong candidate for companies seeking technical development and support in these sectors.
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Healthcare IT Services Business services Other Industry Retail Software Information technology Education Real estate

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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

Swedish clients in Stockholm commend Slashdev for their swift, high-quality mobile development, including banking apps and EdTech features. Reviewers value their transparency, skilled senior engineers, and proactive project management, resulting in successful, timely project outcomes.
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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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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 Knowledgeable
Clients consistently express high satisfaction with OpenGeeksLab's knowledgeable team, highlighting their expertise in software development. One reviewer noted the developer's logical and consistent approach, which facilitated clear communication and collaborative project management. Another client emphasized the developers' self-motivation and professionalism, instilling confidence in their capabilities. Overall, the sentiment is overwhelmingly positive, with clients appreciating the team's responsiveness and commitment to delivering high-quality results.

Staff Augmentation for Custom Software Dev Company

5.0 Mar 16, 2023

We are impressed with their experience and credentials, as well as their responsiveness and willingness to work collaboratively with our team. Their specialist is highly experienced and knowledgeable in software development and provides a valuable contribution to our projects. He works closely with our product owners and other stakeholders to ensure that our requirements are met, and he provides ongoing support and maintenance for our websites.
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Software Development for Business Management Company

4.0 Feb 12, 2018

They performed very well by using their own knowledge to plan the amount of time needed to develop each section. This gave us great confidence that we had great and self-motivated developers involved. OpenGeeksLab has developers that are easy to work with. They provide professional services in management and development. Their understanding and effort of work are unquestionable.
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Industry Experience

OpenGeeksLab has demonstrated expertise across multiple industries, including Beauty & Cosmetics, Advertising & Marketing, Software, Logistics & Supply Chain, Education, and Business Services. Clients consistently commend their professionalism, timely delivery, and ability to create tailored web solutions that enhance user engagement. Positive feedback highlights their strengths in project management and communication, particularly in developing user-friendly platforms and e-commerce systems. Overall, they are well-suited for projects in retail, software development, and educational platforms.
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Beauty & Cosmetics Advertising & marketing Software Logistics & Supply Chain Other Industry Business services Education

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Average Project Cost Breakdown

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

What Clients Have Said
Clients consistently highlight OpenGeeksLab's competitive pricing and excellent value for money. One client noted that their pricing 'fit our budget' while another emphasized their 'good value for cost.' Overall sentiment reflects satisfaction with the affordability of services, suggesting that clients perceive a strong return on investment. Despite some minor suggestions for improvement, the majority of feedback underscores the company's ability to deliver high-quality results within budget constraints.
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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 blockchain prototypes, particularly within Hyperledger and Ethereum environments. The reviews highlight their responsiveness, agile project management, and competitive pricing, with 100% of reviewers noting successful prototype validation. They are recommended for small-scale projects due to their niche expertise and adaptability.

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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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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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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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Focus

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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

33.6/40.0

15.8/20 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

35.7/40.0

17.2/20 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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Top Blockchain Companies & Developers in Stockholm

List of the Top Stockholm Blockchain Development Companies

Reviews mention Open to feedback

Custom Software Development for Blockchain Company

Cryptocurrency & Blockchain Dev for Asset Tokenization Co

Blockchain Development for FinTech Company

Blockchain Development for FinTech Company

Industry Experience

Select Industry to see insights

Average Project Cost Breakdown

What Clients Have Said

Reviews mention Reasonable pricing

Dev Staff Augmentation for Software Development Company

Mobile App Dev & Staff Augmentation for Banking Company

Web Design for Staffing & Selection Company

Reviewed 2 times in the past 6 months

Industry Experience

Select Industry to see insights

Industry Experience

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Average Project Cost Breakdown

What Clients Have Said

Reviews mention Knowledgeable

Staff Augmentation for Custom Software Dev Company

Software Development for Business Management Company

Industry Experience

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Average Project Cost Breakdown

What Clients Have Said

Industry Experience

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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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