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Top API Developers in Chicago

Ratings Updated: April 2, 2026

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6 Leaders 15 Contenders

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

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$5,000+

$25 - $49 / hr

10 - 49

Downers Grove, IL

Services provided

10% API Development

30% Custom Software Development

15% Mobile App Development +5 services

10% Back Office Outsourcing

10% Cloud Consulting & SI

10% E-Commerce Development

10% IT Strategy Consulting

5% AI Development

Profusion Systems is a highly regarded company specializing in API Development Services and API Integration. They deliver efficient and value-driven API solutions, as evidenced by positive feedback from clients who appreciate their timely project completion and unique problem-solving capabilities. Approximately 100% of reviewers highlight their effective communication and adherence to budget constraints.

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Reviews mention Exceptional performance
Clients have consistently praised Profusion Systems for their exceptional performance, particularly highlighting their ability to deliver unique solutions in complex environments. One IT Manager noted their impressive capacity to address all scoped items within budget and timeline, while another emphasized the significant reduction in paper usage due to effective API implementations. Overall, the sentiment reflects strong satisfaction with project management and responsiveness, marking Profusion Systems as a reliable partner for custom software solutions.

ERP & API Development for Food Servicing Company

5.0 Jun 4, 2025

Chirag has been the Project for the last year. Communicates effectively on all deliverable items. The majority are finished within the timeline laid out when the initial scope was created. Profusion as a whole has always been very responsive to the question or issue, we see. Resolving most issues within minutes.
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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 express satisfaction with Profusion Systems' pricing and value for money. One client noted that their 'pricing fit our budget' and highlighted 'good value for cost.' Another stated that Profusion 'delivered on time and on budget,' emphasizing the positive return on investment. Overall, clients appreciate the company's ability to provide high-quality solutions while remaining flexible and responsive, often exceeding expectations without escalating costs.
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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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Review Rating from Clients

5.0/5.0

Quality

5.0

Schedule

4.8

Cost

5.0

Willing to Refer

5.0

Chicago-based reviewers highlight Profusion Systems's expertise in custom software development, API integration, and scalable solutions for complex environments. They delivered projects on time, supporting food service, data management, and operational efficiency for large organizations, demonstrating strong project management and innovative problem-solving skills.
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Hristov Development

5.0 11 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 custom software development agency specializing in AI integration, IT consulting, and agile prototyping. Their reviews demonstrate a 100% positive reception, with clients highlighting their technical expertise, proactive communication, and customer-centric approach. Notably, 80% of reviewers emphasized their innovative solutions and reliable project management. The company is praised for exceeding expectations and delivering timely, scalable, and user-friendly solutions.

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Reviews mention Great project management
Clients consistently praised Hristov Development for their excellent project management, highlighting their clear communication and timely deliverables. One client noted that the team maintained regular updates and ensured alignment on goals, while another emphasized their agile methodology and adaptability to changing requirements. Both reviews underscored the company's commitment to meeting deadlines and providing proactive problem-solving, contributing significantly to project success.

Data Management Tool Dev for Business Development Company

5.0 Dec 12, 2022

Kristian and his team met all deliverables on time and without issue. Their project management was excellent with regular updates and communication. We had direct access to Kristian and his development team.
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Custom Software Development for Career Management Platform

5.0 Dec 14, 2024

Hristov Development demonstrated exceptional project management skills throughout our collaboration. Their team maintained clear and transparent communication, provided regular updates, and ensured alignment on goals and deliverables. Their agile methodology allowed them to adapt seamlessly to changing requirements, while their structured approach with well-defined milestones ensured consistent progress and measurable outcomes.
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Industry Experience

Hristov Development has demonstrated expertise primarily in the Software, Real Estate, Consulting, and Research industries. Clients in Software praised their custom software development and AI integration capabilities, noting significant improvements in user engagement and operational efficiency. In Real Estate and Consulting, feedback highlighted their agile development support and responsiveness. The Research sector noted their ability to create scalable, user-friendly platforms. Overall, sentiment across industries reflects strong satisfaction with their technical skills, project management, and customer-centric approach.
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Software Real estate Consulting Research

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Average Project Cost Breakdown

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

What Clients Have Said
Clients consistently commend Hristov Development for their competitive pricing and exceptional value for money. One client noted that their 'pricing fit our budget' and emphasized the company's alignment with their values. Another remarked on the 'good value for cost,' highlighting their expertise. Overall, feedback indicates that clients feel they receive high-quality service and outcomes that justify their investment, with many stating they experienced efficient project management and timely deliverables without compromising on quality.
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United States (6) Switzerland (1)

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LOGICON, LLC

5.0 6 reviews

$25,000+

$100 - $149 / hr

10 - 49

Oakbrook Terrace, IL

Services provided

15% API Development

20% Business Consulting

15% Robotics Process Automation +5 services

10% BI & Big Data Consulting & SI

10% Cloud Consulting & SI

10% Custom Software Development

10% DevOps Managed Services

10% Microservices Architecture Services

LOGICON, LLC is a versatile technology development company specializing in web and mobile applications, with a particular expertise in customized solutions and financial products. The reviews indicate a high level of client satisfaction, with approximately 80% of feedback highlighting their efficient project management and adaptability to client needs. The company is praised for meeting timelines consistently, although some reviews noted language barriers and project management transitions as areas for improvement.

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Industry Experience

LOGICON, LLC has garnered positive feedback across several industries, including Education, Advertising & Marketing, Media, Financial Services, and Gaming. Clients commend their expertise in web and mobile development, project management, and adaptability to client needs. Particularly in Education and Financial Services, LOGICON's timely delivery and competitive pricing have been highlighted. Their strength in mobile app development is noted in Advertising & Marketing, while they also excel in customized solutions in Media and Gaming. Overall, LOGICON is well-suited for clients seeking robust technical support across these sectors.
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Education Advertising & marketing Media Financial services Gaming

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Average Project Cost Breakdown

$10,000 to $49,000 (2) $200,000 to $999,999 (2) $50,000 to $199,999 (1)

What Clients Have Said
LOGICON, LLC has received positive feedback regarding their pricing and value for money. Clients have praised their competitive pricing, noting that they felt fortunate to secure a good deal, especially given the efficiency and quality of work delivered. One client invested approximately $250,000 and expressed satisfaction with the outcomes, stating that LOGICON's resources significantly accelerated their project timeline. Overall, clients view LOGICON as a reliable partner that meets expectations while providing substantial value.
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More responsive than most other service providers

LOGICON, LLC 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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Italy (1) Malaysia (1) Qatar (1) Switzerland (1) United States (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 development company specializing in creating digital solutions across various platforms, including mobile apps, ERP systems, and websites. Reviews highlight their technological flexibility, excellent project management, and strong marketing skills, with 100% positive feedback on their ability to meet client needs and exceed expectations. Clients appreciate their efficiency and personalized approach, though some mention potential improvements in time management.

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Reviews mention Well-organized projects
Clients consistently praised Studio Krew for their well-organized project management. One CTO noted the effective communication and accurate time estimates provided by their project manager, which facilitated smooth collaboration. The team employed tools like Trello and Zoho to coordinate efforts, enhancing overall efficiency. Their flexibility and ability to scale teams quickly were also highlighted as significant strengths, contributing to a positive and structured project experience.

Product Development & Marketing for Sports Startup

4.5 Feb 26, 2019

I had a project manager who kept in touch for all of the non-technical logistics and dealt with the developers directly. We worked in sprints to hit on all of the features for my first startup’s product and used email, Zoho, and Trello to coordinate. The team’s communication was fantastic; they always provided accurate time estimates.
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Industry Experience

StudioKrew has demonstrated expertise across diverse industries including Business Services, IT Services, and Arts & Entertainment. Clients commend their exceptional communication, project management, and marketing capabilities, particularly in developing tailored software solutions and mobile applications. Overall, feedback reflects a positive sentiment, highlighting their flexibility, responsiveness, and ability to deliver impactful results, making them a strong candidate for businesses seeking digital development support in these 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
Overall, clients expressed satisfaction with Studio Krew's cost and value for money. One CTO noted an investment of approximately $100,900, highlighting that the team consistently exceeded expectations while staying within budget. Another client, a COO, spent around $80,000–$90,000 and praised the efficiency and effectiveness of the delivered product. A comedian reported a modest investment of $786, emphasizing high satisfaction with the final outcome. Clients generally felt that the quality of work justified the costs incurred.
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India (2) Canada (1)

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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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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 Accommodating
Crispy Software Solutions received positive feedback regarding their accommodating nature, with clients noting their exceptional responsiveness and ability to adapt to changing requirements. One client highlighted how Chris and his team consistently delivered items ahead of schedule and took the initiative to clarify objectives. Their proactive communication and willingness to integrate client feedback were particularly appreciated, although a few instances of delayed communication were noted. Overall, the sentiment reflects a strong commitment to client satisfaction and collaboration.

Custom Software & Web Dev & Design for Business Consultancy

4.5 Sep 5, 2024

Chris and his team demonstrated exceptional project management skills throughout the entire process. They were highly responsive to our needs, consistently delivering items on time and often ahead of schedule. Even when our requirements were not fully defined, Chris took the time to understand our objectives and worked closely with us to clarify our expectations.
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Custom Software & Web Dev & Design for Business Consultancy

4.5 Sep 5, 2024

Working with them was a pleasure; they were highly adaptable to our schedules and timelines, making the collaboration seamless and enjoyable. Their ability to combine technical expertise with a genuine interest in the impact of our work set them apart and made them invaluable partners in our project.
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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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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 LOGICON, LLC

3 StudioKrew

4 TwinCore

5 Profusion Systems

6 JAM-IT BPM Consultants

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 6 Chicago API Development Services

Hristov Development

$5,000+

$25 - $49 / hr

10 - 49

Chicago, IL

Ability to deliver

32.5/40.0

16.4/20 Reviews

9.8/10 Clients & Experience

6.3/10 Market Presence

Service focus

10% API Development

90% Other

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LOGICON, LLC

$25,000+

$100 - $149 / hr

10 - 49

Oakbrook Terrace, IL

Ability to deliver

31.8/40.0

16.6/20 Reviews

10/10 Clients & Experience

5.2/10 Market Presence

Service focus

15% API Development

85% Other

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StudioKrew

$5,000+

$25 - $49 / hr

50 - 249

Chicago, IL

Ability to deliver

28/40.0

15.2/20 Reviews

6.7/10 Clients & Experience

6.2/10 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

27.8/40.0

16.6/20 Reviews

6.3/10 Clients & Experience

4.9/10 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

21.9/40.0

17/20 Reviews

0/10 Clients & Experience

4.9/10 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

21.5/40.0

13.8/20 Reviews

3.7/10 Clients & Experience

4/10 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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Kleinschmidt Inc.

$1,000+

Undisclosed

50 - 249

Deerfield, IL

Ability to deliver

21.5/40.0

16.4/20 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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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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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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Policy Claim Management International (PCMI)

Undisclosed

Undisclosed

50 - 249

Park Ridge, 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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Placematic USA LLC

Undisclosed

$25 - $49 / hr

2 - 9

Rolling Meadows, IL

Ability to deliver

4.6/40.0

0/20 Reviews

0/10 Clients & Experience

4.6/10 Market Presence

Service focus

20% API Development

80% Other

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Hawkdive Media

Undisclosed

$50 - $99 / hr

2 - 9

Naperville, IL

Ability to deliver

4.9/40.0

0/20 Reviews

0/10 Clients & Experience

4.9/10 Market Presence

Service focus

30% API Development

70% Other

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AptlyLabs Inc

$10,000+

$25 - $49 / hr

10 - 49

South Barrington, IL

Ability to deliver

4.9/40.0

0/20 Reviews

0/10 Clients & Experience

4.9/10 Market Presence

Service focus

20% API Development

80% Other

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