Home API Development United States Chicago

Top API Developers in Chicago

Ratings Updated: July 22, 2026

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6 Leaders 15 Contenders

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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

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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 an API Development company specializing in creating custom API endpoints and integrations for seamless data exchange and paperless workflows. Reviews indicate a 100% positive feedback rate, highlighting their effective communication, timely delivery, and unique solutions within budget constraints. Approximately 75% of reviewers commend their ability to handle complex environments efficiently.

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Reviews mention Timely
Overall, feedback regarding Profusion Systems' timeliness is highly positive across various reviews. Clients consistently noted that deliverables were completed on schedule, with one client emphasizing that the majority of items were finished within the initially laid out timelines. Additionally, another client praised their project management process for keeping projects moving forward and ensuring nothing fell through the cracks. This reliability in meeting deadlines has significantly contributed to client satisfaction and trust in the company's capabilities.

Financial & IT Strategy Consulting for Real Estate Nonprofit

5.0 May 27, 2025

Profusion provided their deliverable on time and on schedule. They provided all the necessary resources and time commitment in order to gather all of the required information.
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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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WordPress & Custom Software Dev for Dentists' Association

5.0 May 27, 2025

Profusion Systems delivered on time and was very responsive to our needs. Their project management process was great; it kept the projects moving forward and assured that nothing fell through the cracks. Profusion Systems has delivered on projects time and time again. No matter the scope, technology, or platform, they have the resources to support our IT needs.
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Industry Experience

Profusion Systems has demonstrated expertise across various industries, including Food & Beverage, Retail, and Professional Associations. Clients in the Food & Beverage sector praised their ability to create custom ordering platforms and improve operational efficiency, while Retail clients highlighted their robust application development and project management skills. Feedback from Professional Associations emphasized their responsiveness and successful delivery of IT solutions. Overall, sentiments are positive, suggesting that Profusion Systems is well-suited for projects requiring custom software solutions and system integrations.
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Other industries Food & Beverage Nonprofit Retail

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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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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 commend Profusion Systems for their deep technical knowledge, project management skills, and capacity to support intricate, long-term digital transformation initiatives across various industries.
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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 company known for its expertise in AI integration, IT consulting, and innovative software solutions. They excel in agile project management, with 100% of reviews highlighting their rapid prototyping and exceptional communication skills. Clients consistently commend their dedication and ability to deliver tailored solutions, contributing significantly to project success and user engagement.

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Reviews mention Innovative
Clients have consistently praised Hristov Development for their innovative approach to software development and AI integration. One client highlighted their 'exceptional' ability to rapidly prototype and implement features, which significantly contributed to user engagement and operational efficiency. The team's commitment to understanding client needs and delivering tailored solutions was noted as a key differentiator. Overall, the sentiment around innovation is overwhelmingly positive, with clients acknowledging Hristov Development as a reliable partner in achieving transformative project outcomes.

Custom Software Development for Career Management Platform

5.0 Dec 14, 2024

What impressed me most about Hristov Development was their deep commitment to understanding our needs and ability to deliver tailored, innovative solutions that exceeded expectations. Their unique combination of technical expertise, proactive communication, and adaptability set them apart from other partners we’ve worked with. They didn’t just meet deadlines; they consistently added value by anticipating challenges and providing thoughtful, strategic guidance.
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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 highlight Hristov Development's strong value for money, noting their competitive pricing and high-quality deliverables. One client emphasized that they selected Hristov due to 'good value for cost' and praised their ability to meet project milestones efficiently. Another review mentioned that the team provided 'quick and lean' solutions at competitive rates. Overall, the sentiment across reviews reflects satisfaction with the pricing relative to the quality of service received.
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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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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 software development company specializing in mobile and web application development, as well as IT consulting services. Across multiple reviews, clients commend their ability to deliver projects on time and meet client expectations, with 100% of reviewers highlighting their professionalism and adaptability. Some reviews mention language barriers and project manager changes as areas for improvement, but overall, feedback remains overwhelmingly positive.

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Reviews mention Accessible
Clients have expressed a strong sentiment regarding LOGICON, LLC's accessibility. One CEO highlighted that Murad, the CEO of Logicon, was 'always available for discussions and to provide input,' which greatly benefited the team. Additionally, the structured communication approach using tools like Jira and Slack facilitated smooth interactions. Overall, LOGICON is praised for its commitment to being accessible and responsive, fostering effective collaboration throughout the project.

Custom Software Dev for Investing Solutions Company

5.0 Jun 12, 2022

We communicated via Jira, Slack, WhatsApp, Google Meet and Zoom. We had set a structure in our approach from day 1 and managing the process was very easy and smooth. Murad, the CEO of Logicon was always available for discussions and to provide input which was of great benefit to me and the team.
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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.
Get in Touch

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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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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 Knowledgeable
Clients consistently praised Crispy Software Solutions for their exceptional knowledge and expertise in developing customized software solutions. One client highlighted the team's 'deep knowledge of the systems needed' and their ability to provide innovative solutions that aligned with project goals. Another noted their comprehensive understanding of grant management and applicant tracking, which significantly improved operational efficiency. Overall, the sentiment is highly positive, reflecting confidence in Crispy Software Solutions' capabilities and their commitment to delivering tailored systems.

Custom Software & Web Dev & Design for Business Consultancy

4.5 Sep 5, 2024

Chris and his team stood out for their exceptional knowledge of the tools needed to build our systems, paired with a deep understanding of the vision behind our grant work. They didn’t just focus on the technical aspects; they actively contributed ideas to enhance the final product, aligning it closely with our goals. 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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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 LOGICON, LLC

3 TwinCore

4 StudioKrew

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

32.8/40.0

16.4/20 Reviews

9.8/10 Clients & Experience

6.6/10 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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TwinCore

$25,000+

$25 - $49 / hr

10 - 49

Chicago, IL

Ability to deliver

28.2/40.0

17/20 Reviews

6.3/10 Clients & Experience

4.9/10 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

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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Profusion Systems

$5,000+

$25 - $49 / hr

10 - 49

Downers Grove, IL

Ability to deliver

21.3/40.0

16.4/20 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

21.1/40.0

13.4/20 Reviews

3.7/10 Clients & Experience

4/10 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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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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Meta App Designs

$25,000+

$25 - $49 / hr

10 - 49

Naperville, IL

Ability to deliver

23.3/40.0

16.4/20 Reviews

0/10 Clients & Experience

6.9/10 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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