Custom API Integration and Development Services Company
ColorWhistle is a leading expert in custom API development services and integration solutions. From simple API integration services to complex or multiple end-points custom API development, we can create a solution that is easy to consume, well documented, and truly dependable.
We have a professional team of API developers in India who can construct web APIs that are completely scalable, secure, and match your business requirements. Our custom API development services will enrich and enhance your services in new and creative ways.
- White Label Partnerships
- Startup Business Partnerships
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API Development and Integration Services
Our API integration and development team have vast knowledge in the technologies behind API, and also master the end-to-end process (managing, monitoring, and monetizing). We are also experienced in developing custom APIs, open-source APIs, WordPress REST API, and third-party APIs.
As a highly acclaimed API development company, we have supported clients in the USA, UK, Canada, Singapore, and more by strategizing, managing, and running high-performance API programs to meet their business goals.
Our API Services Will Simplify your Systems and
Reduce your Operating and Maintenance costs
Basically, APIs are fundamentally changing how data can be used. This concept is opening up new business models and strategies for products. Our API development company has recognized this shift and the importance of APIs.
Over the past years, we’ve improved our capabilities in this area to become one of the leading experts in custom API development and integration. ColorWhistle’s professional developers can integrate the API according to your requirement to enrich and enhance the services you offer to your end customers.
Get in touch with our custom API developers to find out how our custom API development services can help you overcome tech-related problems


Industries We Serve
Our API development team at ColorWhistle are experts in developing innovative solutions for clients in a vast variety of industries and verticals. We are dedicated to helping businesses in the travel, hotel & restaurant, education, healthcare, and real estate industries gain more leads, conversions, and loyal customers.
Popular API Integrations We Work With
We provide top API integration for real estate professionals to get access to MLS and IDX data from providers such as Zillow, Rets.ly, SimplyRETS, Data.gov, Walk Score, DataNerds Property, Yelp Fusion, Rets Rabbit, and more.
Example of Real Estate API Integration Combinations
- Zillow + WordPress
- Mailchimp + Zillow
- IDX, MLS + WordPress
Our professional API developers can work with channel management software and GDS/API/XML integration for flights, hotels, cruise, navigation, weather, and more.
Example of Travel API Integration Combinations
- Website + TripAdvisor content
- Website + Public transportation
- Website + Travel management and planning
We offer API integration services for patient registration, scheduling, finances & billing, insurance, clinical, ancillary, public health, and IOT while supporting healthcare information standards such as HL7, FHIR, HL7v2, HL7v3, and MLLP.
Example of Healthcare API Integration Combinations
- Mail Chimp + Acuity Scheduling
- Acuity Scheduling + Google Calendar
- Acuity Scheduling + WordPress
Our API developers can create a great learning environment for students by integrating APIs such as communication, collaboration, whiteboard, virtual classroom, and content sharing.
Example of Education API Integration Combinations
- Teachable + Active Campaign
- Teachable + Custom reminders
- Teachable + Convertkit
We offer API integration services for the most popular Google APIs such as maps, chart, checkout, translate, search, Webmaster tools, analytics, AdWords, and YouTube.
Example of Google API Integration Combinations
- YouTube + Discord
- YouTube + Slack
- Dropbox + YouTube
- Stripe + Google Analytics
Integrate sales API into your custom software to manage your CRM. Some common integrations that we do are HubSpot, Salesforce, Marketo, Constant Contact, and more.
Example of Sales API Integration Combinations
- Facebook lead ads + HubSpot
- Pipedrive + Slack
- Facebook lead ads + Salesforce
We integrate marketing APIs such as LinkedIn Marketing Developer, Google Adwords, Clearbit, FullContact, MailChimp, Hootsuite, other social login gateways, and more to manage your audience and find new customers.
Example of Marketing API Integration Combinations
- Delighted + Slack
- Delighted + Prodsight
- Typeform responses + Google Sheets
We can integrate communication APIs for SMS (Two-Way SMS API, SIP Trunking
Number Discovery) and e-mail (SendGrid, ZeroBounce, etc) to attract, convert, and retain customers.
Example of Communication API Integration Combinations
- Google Sheets + SendGrid
- Gravity Forms + SendGrid
- Facebook Lead Ads + SendGrid
- Mailchimp + SendGrid
- ClickFunnels + Mailchimp
- Google Forms + Mailchimp
- Wave + Mailchimp
Our company offers secure CMS platform integration via API connectors. We connect to WordPress, Joomla, Drupal, HubSpot, Kentico, Magento, Sitecore, Contentful, Sitecore, Typo3, and more
Example of CMS API Integration Combinations
- PlanSo Forms for WordPress + Google Sheets
- PlanSo Forms for WordPress + HubSpot
- WordPress + Facebook Pages
- WordPress + LinkedIn
- WordPress + Slack
- HubSpot + Wave
- Google Contacts + HubSpot
Our API developers can integrate with the leading accounting solutions, like QuickBooks, Xero, MYOB, Freshdesk, Sage, Fortnox, and more.
Example of Accounting API Integration Combinations
- Freshdesk + Slack
- Freshdesk + Trello
- Freshdesk + Asana
- Stripe + Xero
- Xero + Digest by
- Zapier + Slack
We offer Social Media API integration services for Facebook, Twitter, LinkedIn, Google+, Instagram, Pinterest, YouTube, Vimeo, Bebo, and much more to help you reach a large amount of audience.
Example of Social Media API Integration Combinations
- Instagram + Facebook Pages
- Facebook Pages + LinkedIn
- Facebook Pages + Slack
- Twitter + SMS by Zapier
- LinkedIn Lead Gen Forms + Salesforce
- LinkedIn Lead Gen Forms + HubSpot
Our API developers in India can help you find the right API marketplaces like Zapier, Integratedly, MuleSoft’s Anypoint, or Integromat and seamlessly integrate your software into them.
Example of MarketplaceAPI Integration Combinations
- Facebook Marketplace + Hubspot
- Bigcommerce + HubSpot
With GraphQL (data query and manipulation language for APIs), we can improve your application’s performance and scalability and provide the requested data.
Our team can integrate e-commerce APIs such as security, price comparison, shipping, site search, payment handling, and store API integration that are aimed at enhancing the customer shopping experience.
Example of E-commerce API Integration Combinations
- Amazon Seller Central + Salesforce
- Dropbox + Amazon S3
- WooCommerce + Xero
We offer payment gateway integration service using the famous gateways such as PayPal, Stripe, Authorize.net, Google Checkout, PayU, BillDesk, and CCAvenue.
Example of Payment Gateway API Integration Combinations
- Stripe + Wave
- Stripe + Mailchimp
- Stripe + Slack
- Stripe + Email by Zapier
- PayPal + Mailchimp
- PayPal + Slack
- PayPal + Salesforce
Building Cost Effective API Services to Scale and
Provide Less Price Solutions to Customers
Basically, APIs are fundamentally changing how data can be used. This concept is opening up new business models and strategies for products. Our API development company has recognized this shift and the importance of APIs.
Over the past years, we’ve improved our capabilities in this area to become one of the leading experts in custom API development and integration. ColorWhistle’s professional developers will integrate the API according to your requirement to enrich and enhance the services you offer in a new and creative way.
Get in touch with our custom API developers to find out how our custom API development services can help you overcome tech-related problems
5+ Years of Committed Service
650 + Projects
100 % Client Retention
16 + Years of Domain Expertise
30 + Experts

Business Benefits of Using Custom APIs
- Allows siloed apps like CRMs, ERPs, communication, and marketing automation platforms to communicate with each other to enhance the personalization that an organization requires
- Third-party API Integration offers real-time functionality without the need to write complex codes (especially for e-commerce, travel, finance and other industries)
- Workflows can be strategically orchestrated to optimize productivity
- Reduce cost and improve time to market
- Personalize and customize the customer experience
Our Custom API Offerings
API Integration & Development Services
We are experts in custom API development services and integration solutions. Our team can extend the functionality of your application via new and existing third-party systems.
Source Code Repository Integration
Our developers will work with you to find the best source code repository integration solution like GitHub, TFS, GitLab, and Bitbucket
API as a Service
The API developers in our company can build web APIs and API as a Service (APIaaS) through web protocols like HTTP/HTTPS, XML, JSON, REST, and SOAP
API Development Platform
We create APIs for desktop, mobile, cloud apps, web sockets, Service-Oriented Architectures (SOA), and databases
Marketing Software API Integration Services
Through our CRM and marketing software API integration services, we will help you share data between your systems and streamline your business processes with no trouble.
Custom Web API Solutions
ColorWhistle is a pioneer API development company that offers quality custom API solutions. We use best development tools to build high-performance APIs for your needs.
Samples of our Featured Work


Logo Design for Tots in pots
Tots in pots is a greenery intiative to spread this awareness as much as possible to help you make most of the greenery that you surround yourself at present.












Logo Design for Statinfer
Statinfer aims to offer training on Machine Learning, Deep Learning and Artificial Intelligence using tools like R, Python and TensorFlow
























Logo Design for Hungry Bells
Hungry Bells India’s first personalized food journal that recommends you tasty meal/dishes in your location. It is mobile first food marketplace for consumers who wants good food supply for daily consumption requirement.


























Logo Design for Power BenchMarking
Power benchmarking is a power company that distributes power in specific states of US when there is a demand





















Logo Design for AJ Agro Farms
AJ Agro farms is a passionate team of Millenials, who are interested in raising cattle and distribute milk products locally.

















Logo Design for JC Barnett
Jcb School Of Jump Shooting is a Basket ball coaching academy whose mission is to equip driven basketball players in North Central Indiana with a quality jump shot that will take them and their basketball game to the next level.






























Logo Design for Mediator Academy
Mediator Academy is an online education platform for improving the skills, knowledge and effectiveness of mediators, students and dispute resolution professionals.
























Logo Design for Flowerbomb
Flowerbomb is a logo that was created for a standup speaker in Kokomo. The logo was expected to communicate freshness and standup speaking.




























Logo Design for On A Healthy Note
On A Healthy Note is an ecommerce brand selling organic beauty and health products. The brand wanted to reflect a strong organic base with earthy tones.

















Logo Design for IamStefani
Iam Stefani is a ministry website for Stefani Butler. She is founder of iamstefani ministries, based in Kokomo, Indiana. She is also founder and creative director of nitara, a digital marketing and design agency based in historic downtown Kokomo.

















End State Business Solution
Endstate Business Solutions in a company that specializes in planning, strategizing and helping out in project management for its end clients.

















Logo design for CodingTown
Coding town is a software company that has its roots in india. The company specializes in mobile application and web application projects.

















Professional API integration partner for
B2B Outsourcing & Whitelabel Company Services
ColorWhistle will work behind the scenes and make you look great in front of your clients. You take all the credits. Our expert API developers will make sure all our API integration and development services will extend the usefulness and functionality of your web service
As a general rule, we will never contact your customers directly. But in the event of such a situation, we are on your team.
All of our B2B services are designed to off-load the API development and integration needs of any agency. We are happy to work under your branding to take care of your customers.
Let us integrate APIs for your clients on time and on budget!