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Top API Developers in Chicago

Ratings Updated: October 22, 2026

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9 Companies

Country: United States

State: Illinois

City: Chicago

API Type: REST API

List of the Top Chicago API Development Services

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Profusion Systems

5.0 4 reviews

Verified

$5,000+

$25 - $49 / hr

10 - 49

Downers Grove, IL

Services provided

10% API Development

35% Custom Software Development

25% AI Development +3 services

10% Cloud Consulting & SI

10% E-Commerce Development

10% Mobile App Development

Profusion Systems is an API Development services company that excels in creating custom API solutions and integrations. They received positive feedback for their effective project management and ability to meet complex needs within budget and timelines, with 100% of reviewers highlighting their unique solutions and responsiveness.

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Average Project Cost Breakdown

$10,000 to $49,000 (1) $50,000 to $199,999 (1) $200,000 to $999,999 (1)

What Clients Have Said
Clients consistently highlight Profusion Systems' competitive pricing and overall value for money. For instance, an IT Manager noted that their pricing fit the budget and provided good value for the cost. Similarly, a Vice President emphasized the company's alignment with their budget while delivering quality results. The sentiment across reviews reflects satisfaction with the cost-effectiveness of services, with one client stating they saved millions due to effective project execution and resource management.
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More responsive than most other service providers

Profusion Systems 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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1 of 1 Chicago-based review is 5 stars

$50,000 – $199,999 avg. project cost for API Development services in Chicago

Chicago-based API Development project highlight

ERP & API Development for Food Servicing Company
5.0 — Profusion Systems has developed a custom ordering platform for a food servicing company. The team has created custom API endpoints, built custom workflows within NetSuite, and integrated Read more
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Review Rating from Clients

5.0/5.0

Quality

5.0

Schedule

4.8

Cost

5.0

Willing to Refer

5.0

Reviewers in Chicago emphasize Profusion Systems' ability to build and adapt custom software for demanding environments, including food-service systems serving hundreds of schools, workforce tools, and e-commerce integrations. Clients cite strong technical knowledge, flexibility as project needs expanded, and measurable efficiency and cost benefits.
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Hristov Development

5.0 12 reviews

$5,000+

$25 - $49 / hr

10 - 49

Chicago, IL

Services provided

10% API Development

10% Application Management & Support

10% Cloud Consulting & SI +7 services

10% Custom Software Development

10% E-Commerce Development

10% IT Managed Services

10% IT Staff Augmentation

10% Mobile App Development

10% UX/UI Design

10% Web Development

Hristov Development is a versatile software development company specializing in custom software solutions, AI integration, and data management tools. Their reviews highlight a strong commitment to technical excellence and exceptional project management. With 100% of reviews praising their communication skills and responsiveness, clients frequently commend their ability to deliver tailored, innovative solutions efficiently and effectively.

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Reviews mention Reasonable pricing
Clients have highlighted Hristov Development's reasonable pricing as a significant advantage. One reviewer noted, 'few I find are as much of a pleasure to work with, quick, and competitively priced like Kristian and his team.' This sentiment reflects an overall positive perception of the company's value, emphasizing their affordability in comparison to industry standards, while maintaining high-quality service.

Web Dev for UX Design Company

5.0 Aug 26, 2022

The main reason behind working with Kristian is that he's just a really good guy. There are a lot of qualified developers and agencies out there, but few I find are as much of a pleasure to work with, quick, and competitively priced like Kristian and his team.
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0 of 1 reviews is 5 stars

Less than $10,000 avg. project cost

Reviewed 1 time in the past 6 months
Hristov Development has received high praise for its recent project involving the integration of a Shopify store with a 3D visualization platform. Clients highlighted their excellent project management, proactive communication, and technical expertise, which facilitated a seamless integration process. One client noted that Hristov Development acted as a bridge between multiple platforms, ensuring that complex requirements were met efficiently. Overall, the sentiment is overwhelmingly positive, with clients expressing satisfaction and confidence in Hristov Development's capabilities.
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More responsive than most other service providers

Hristov Development 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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United States (7) Switzerland (1)

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StudioKrew

4.7 3 reviews

$5,000+

$25 - $49 / hr

50 - 249

Chicago, IL

Services provided

10% API Development

20% Mobile App Development

15% AR/VR Development +5 services

15% Custom Software Development

10% IoT Development

10% Other Application Development

10% UX/UI Design

10% Web Development

StudioKrew is a versatile software development company specializing in product development, ERP systems, CRM solutions, and app development for both iOS and Android platforms. With overwhelmingly positive feedback, clients commend their technical flexibility, marketing prowess, and effective communication, with over 90% expressing satisfaction. However, minor improvements in time management have been suggested by 33% of reviewers.

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Industry Experience

Studio Krew has demonstrated substantial expertise across various industries, including business services, co-working spaces, and arts and entertainment. Clients praise their ability to develop custom applications, manage complex projects, and deliver effective marketing strategies, leading to successful products and increased user engagement. Overall sentiment is positive, highlighting their flexibility, communication skills, and commitment to client satisfaction, making them a strong candidate for projects in technology-driven sectors.
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Business services IT Services Arts, entertainment & music

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Average Project Cost Breakdown

$50,000 to $199,999 (2) Less than $10,000 (1)

What Clients Have Said
Clients generally perceive Studio Krew as offering good value for money, with one client noting they exceeded expectations despite budget concerns. Investments ranged from $786 to approximately $100,900, reflecting a range of project complexities. Feedback highlights the team's flexibility and responsiveness, with successful project outcomes leading to increased user engagement and client satisfaction. However, some clients suggested improvements in time management to enhance efficiency further.
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India (2) Canada (1)

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Chicago, IL

111 North Wabash Ave. Ste.100
Chicago, IL 60602
2 - 5

+12893022793

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uFlow Decision Engine

Not yet reviewed

$5,000+

Undisclosed

10 - 49

Chicago, IL

Services provided

20% API Development

20% AI Development

20% Cloud Consulting & SI +2 services

20% Graphic Design

20% Web Development

UFlow Decision Engine, a graphic design agency, offer Graphic Design and cloud consulting & SI. They were founded in 2020.
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Adminix

Not yet reviewed

$1,000+

$50 - $99 / hr

2 - 9

Chicago, IL

Services provided

25% API Development

20% AI Development

20% Enterprise App Modernization +3 services

15% Custom Software Development

10% DevOps Managed Services

10% Low/No Code Development

Adminix is a software development firm headquartered in Chicago, Illinois and Vyshhorod, Ukraine. Founded in 2022, the team offers Custom Software Development and API Development.
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Inspirit Dev

5.0 7 reviews

$10,000+

$50 - $99 / hr

10 - 49

Naperville, IL

Services provided

10% API Development

40% Custom Software Development

15% Microservices Architecture Services +5 services

10% AI Agents

10% Enterprise App Modernization

5% AI Development

5% DevOps Managed Services

5% Other Application Development

Inspirit is a versatile technology consulting firm specializing in web development, AI integration, and data management solutions. The company has received overwhelmingly positive feedback, with 100% of reviewers praising their proactive approach, seamless communication, and effective project management. Clients consistently highlight Inspirit's ability to integrate with internal teams and deliver high-quality, timely results that align with their business objectives.

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Reviews mention Adaptable
Inspirit Dev received commendations for its adaptability, effectively responding to the dynamic needs of clients. One client highlighted their proactive communication and ability to pivot quickly without losing momentum, stating that Inspirit Dev felt like an extension of their internal team. The project management approach, characterized by weekly sprints and timely delivery, further underscored their adaptability. Overall, the sentiment towards Inspirit Dev's flexibility and responsiveness was highly positive, with no specific areas for improvement noted.

Agent Deployment Console Dev for Web3 Development Company

5.0 Apr 28, 2025

Lean, responsive, and highly adaptive to our fast-moving environment. They used weekly sprints with async updates, which worked perfectly for our distributed team. Key deliverables were consistently shipped on time, and they were proactive in flagging any risks or blockers early. Whenever we needed to pivot, they adjusted without losing momentum. Their ability to balance structure with flexibility made a big difference.
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Average Project Cost Breakdown

$10,000 to $49,000 (4) $50,000 to $199,999 (1)

What Clients Have Said
Inspirit Dev is consistently regarded as a provider that delivers good value for money. Clients have highlighted the company's pricing as fitting their budgets while appreciating the quality of work received. One client noted that although the price seemed high at first, the exceptional quality justified the cost. Overall, feedback indicates a strong sentiment towards the value Inspirit Dev offers, with clients stating they received significant returns on their investments through efficient solutions and proactive service.
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United States (5) Poland (1)

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$10,000 One rail or provider, sandbox to production $25,000 2-3 rails behind one payment abstraction $40,000 4+ rails, abstraction and reconciliation feed

Banking & Payment Rail API Integration
Production integration of the rails and payment providers: Interac, PAD/EFT, ACSS, Lynx, RTR, Open Banking, Stripe, PayPal, PIX, Plaid, or a direct bank integration. Inspirit Dev handles idempotency, webhooks, retries and rate limits, then feeds every settled transaction back into your ledger so the books match the bank.
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Crispy Software Solutions

4.8 2 reviews

$5,000+

$50 - $99 / hr

2 - 9

Dyer, IN

Services provided

25% API Development

30% Custom Software Development

15% Business Consulting +4 services

10% Low/No Code Development

10% Web Design

5% Mobile App Development

5% Web Development

Crispy Software Solutions is a software development company specializing in creating custom platforms for workforce development and remote staffing. The reviews indicate a 100% positive feedback rate, highlighting their exceptional project management, responsiveness, innovative solutions, and attention to detail. Approximately 50% of reviewers emphasize their ability to deliver projects on time and meet client-specific needs.

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Reviews mention Personable
Crispy Software Solutions received positive feedback for their personable approach and strong attention to detail. One client noted that the company maintained a very personal touch throughout the project, enhancing the overall experience. Additionally, the responsiveness and smooth project management further contributed to a favorable sentiment. Overall, clients expressed satisfaction with the company's communication and support, indicating a high level of trust and collaboration.

Dashboard Dev for Virtual Receptionist & Staffing Company

5.0 Aug 13, 2024

Crispy Software Solutions had a very personal approach and strong attention to detail. The whole process was very smooth with little bugs. Delivery was smooth and on time.
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Industry Experience

Crispy Software Solutions has demonstrated strong expertise in the consulting and business services industries. In consulting, they excelled in developing custom software for workforce development, enhancing applicant tracking and compliance reporting, resulting in increased engagement and efficiency. In the business services sector, their solutions for virtual staffing improved integration and user experience. Overall, feedback highlights their technical proficiency, responsiveness, and ability to deliver tailored solutions that significantly impact client operations across these sectors.
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Consulting Business services

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Average Project Cost Breakdown

Less than $10,000 (1) $50,000 to $199,999 (1)

What Clients Have Said
Clients have praised Crispy Software Solutions for their competitive pricing and overall value for money. One client noted that the pricing fit their budget and highlighted the 'good value for cost' provided. Another client emphasized the significant cost savings achieved through automation, estimating a 25% reduction in administrative overhead. Overall sentiment reflects satisfaction with the cost-effectiveness of the services, alongside quality deliverables and responsive project management.
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Canada (1) United States (1)

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Hawkdive Media

Not yet reviewed

Undisclosed

$50 - $99 / hr

2 - 9

Naperville, IL

Services provided

30% API Development

15% E-Commerce Development

15% Low/No Code Development +5 services

10% Search Engine Optimization

10% Web Design

10% Web Development

5% CRM Consulting and SI

5% DevOps Managed Services

Located in Naperville, Illinois and Budapest, Hungary, Hawkdive Media is a small API Development company. Their services include API Development and Web Development.
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AptlyLabs Inc

Not yet reviewed

$10,000+

$25 - $49 / hr

10 - 49

South Barrington, IL

Services provided

20% API Development

20% Web Development

15% Custom Software Development +4 services

15% Enterprise App Modernization

15% Other Application Development

10% Low/No Code Development

5% Mobile App Development

AptlyLabs Inc is a small software development company. They offer Custom Software Development and Web Development and were launched in 2018.
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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 Hristov Development

2 TwinCore

3 StudioKrew

4 jam-IT BPM Consultants

5 Profusion Systems

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 5 Chicago API Development Services

Hristov Development

$5,000+

$25 - $49 / hr

10 - 49

Chicago, IL

Ability to deliver

33/40.0

16.6/20 Reviews

9.8/10 Clients & Experience

6.6/10 Market Presence

Service focus

10% API Development

90% Other

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TwinCore

$25,000+

$25 - $49 / hr

10 - 49

Chicago, IL

Ability to deliver

26.6/40.0

16.6/20 Reviews

6.3/10 Clients & Experience

3.7/10 Market Presence

Service focus

10% API Development

90% Other

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StudioKrew

$5,000+

$25 - $49 / hr

50 - 249

Chicago, IL

Ability to deliver

25.7/40.0

15.2/20 Reviews

6.7/10 Clients & Experience

3.9/10 Market Presence

Service focus

10% API Development

90% Other

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jam-IT BPM Consultants

$50,000+

$300+ / hr

2 - 9

Evanston, IL

Ability to deliver

21.7/40.0

13.4/20 Reviews

3.7/10 Clients & Experience

4.6/10 Market Presence

Service focus

10% API Development

90% Other

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Profusion Systems

$5,000+

$25 - $49 / hr

10 - 49

Downers Grove, IL

Ability to deliver

20.1/40.0

16.4/20 Reviews

0/10 Clients & Experience

3.7/10 Market Presence

Service focus

10% API Development

90% Other

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DevVerx

$1,000+

< $25 / hr

10 - 49

Skokie, IL

Ability to deliver

13.3/40.0

0/20 Reviews

8.8/10 Clients & Experience

4.6/10 Market Presence

Service focus

10% API Development

90% Other

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uFlow Decision Engine

$5,000+

Undisclosed

10 - 49

Chicago, IL

Ability to deliver

5.2/40.0

0/20 Reviews

0/10 Clients & Experience

5.2/10 Market Presence

Service focus

20% API Development

80% Other

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Scalesology

Undisclosed

$150 - $199 / hr

10 - 49

Chicago, IL

Ability to deliver

5.5/40.0

0/20 Reviews

0/10 Clients & Experience

5.5/10 Market Presence

Service focus

15% API Development

85% Other

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Adtitude Digital

$10,000+

$25 - $49 / hr

2 - 9

Glenview, IL

Ability to deliver

4.6/40.0

0/20 Reviews

0/10 Clients & Experience

4.6/10 Market Presence

Service focus

25% API Development

75% Other

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Pixelum

$25,000+

$50 - $99 / hr

10 - 49

Chicago, IL

Ability to deliver

4/40.0

0/20 Reviews

0/10 Clients & Experience

4/10 Market Presence

Service focus

20% API Development

80% Other

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Webkrafterz

$1,000+

$25 - $49 / hr

10 - 49

Skokie, IL

Ability to deliver

4.6/40.0

0/20 Reviews

0/10 Clients & Experience

4.6/10 Market Presence

Service focus

10% API Development

90% Other

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Meta App Designs

$25,000+

$25 - $49 / hr

10 - 49

Naperville, IL

Ability to deliver

31.5/40.0

16.4/20 Reviews

8.3/10 Clients & Experience

6.8/10 Market Presence

Service focus

10% API Development

90% Other

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Kleinschmidt Inc.

$1,000+

Undisclosed

50 - 249

Deerfield, IL

Ability to deliver

21.4/40.0

16.2/20 Reviews

0/10 Clients & Experience

5.2/10 Market Presence

Service focus

20% API Development

80% Other

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Chicago Web

$5,000+

$100 - $149 / hr

2 - 9

Chicago, IL

Ability to deliver

4/40.0

0/20 Reviews

0/10 Clients & Experience

4/10 Market Presence

Service focus

10% API Development

90% Other

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Pelican Systems

Undisclosed

Undisclosed

2 - 9

Chicago, IL

Ability to deliver

4/40.0

0/20 Reviews

0/10 Clients & Experience

4/10 Market Presence

Service focus

10% API Development

90% Other

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Adminix

$1,000+

$50 - $99 / hr

2 - 9

Chicago, IL

Ability to deliver

4.9/40.0

0/20 Reviews

0/10 Clients & Experience

4.9/10 Market Presence

Service focus

25% API Development

75% Other

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Inspirit Dev

$10,000+

$50 - $99 / hr

10 - 49

Naperville, IL

Ability to deliver

23.2/40.0

17.4/20 Reviews

2.8/10 Clients & Experience

3/10 Market Presence

Service focus

10% API Development

90% Other

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Basis Technologies

Undisclosed

Undisclosed

250 - 999

Chicago, IL

Ability to deliver

0/40.0

0/20 Reviews

0/10 Clients & Experience

0/10 Market Presence

Service focus

10% API Development

90% Other

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Kokomo24/7®

Undisclosed

$200 - $300 / hr

50 - 249

Northbrook, IL

Ability to deliver

5.5/40.0

0/20 Reviews

0/10 Clients & Experience

5.5/10 Market Presence

Service focus

10% API Development

90% Other

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Crispy Software Solutions

$5,000+

$50 - $99 / hr

2 - 9

Dyer, IN

Ability to deliver

22.9/40.0

15.8/20 Reviews

1.4/10 Clients & Experience

5.6/10 Market Presence

Service focus

25% API Development

75% Other

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