Company lists · Data refreshed September 2026
Top 25 Api development software companies worldwide
RevenueBase identified 492 api development software companies worldwide as of September 2026 and tracks 11,034 professional contacts across them, including 4,366 with verified work emails. The United States is the largest market and San Francisco the largest hub.
This list covers api development software companies worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 27, 2026. Country and city lists for api development software companies follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest api development software companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 2,269 contacts → | ||||
Partial evidence “Postman is the world’s leading API platform.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,320 contacts → | ||||
Indirect evidence “WSO2 is a global technology company, owned by EQT, providing the foundational platforms enterprises need to build an agentic future.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 3 | 969 contacts → | ||||
Partial evidence “SmartBear delivers application integrity for modern tech stacks, ensuring continuous, measurable assurance that software just works as intended – with governance to operate at AI…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 4 | 900 contacts → | ||||
Indirect evidence “At Docker, we simplify the lives of developers who are making world-changing apps.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 5 | 892 contacts → | ||||
Partial evidence “No AI without APIs.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 6 | 627 contacts → | ||||
Partial evidence “Sensedia supports companies to become more digital, connected and open through a technology platform and expertise in APIs and Microservices.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 7 | 211 contacts → | ||||
Strong evidence “Agmo Group is Malaysia leading AI/Digital application development company with a team of more than 250 software team members based in Empire City Damansara.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 8 | 187 contacts → | ||||
Strong evidence “Miquido is a one-stop software development company that aims to solve business challenges with cutting-edge technology and data-driven research.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 9 | 176 contacts → | ||||
Partial evidence “Located in Luxembourg, France, Germany, Italy, Switzerland, Portugal, Costa Rica, Shanghaï and Hong Kong, Cap4 Lab helps customers unlock their potential in the development of new…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 10 | 120 contacts → | ||||
Partial evidence “Tyk is a leading API Management Platform.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 11 | 108 contacts → | ||||
Indirect evidence “ShepHertz provides an Enterprise Platform for Agile & Incremental Digital Transformation.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 12 | 80 contacts → | ||||
Partial evidence “OptiValueTek is a leading provider of Solutions for- Application & Process Integration - API Management - Data Engineering - Data Science/MLOps - DevOps & SRE - Cloud Solutions -…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 13 | 74 contacts → | ||||
Indirect evidence “At ReadMe, we help teams build beautiful, interactive documentation.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 14 | 69 contacts → | ||||
Partial evidence “Startup specialiced in APIs.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 15 | 65 contacts → | ||||
Partial evidence “Tiugo Technologies is assembling a unique collection of world-class, API-first developer platforms focused on content and data management, virtual collaboration and customer…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 16 | 65 contacts → | ||||
Partial evidence “Stainless helps you deliver world-class developer interfaces for your API.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 17 | 64 contacts → | ||||
Strong evidence “AI-Driven Software Development Company | SaaS | Web & Mobile Apps | Automation Stop building basic software.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 18 | 62 contacts → | ||||
Partial evidence “At last, API docs you can be proud of!” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 19 | 61 contacts → | ||||
Partial evidence “At Particular Software, it's not just about writing software and building great products.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 20 | 53 contacts → | ||||
Partial evidence “APIMatic is a Developer Experience platform for APIs.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 21 | 51 contacts → | ||||
Partial evidence “AIM is a specialized company providing a wide range of API management solutions and services to ensure optimal performance and security for businesses.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 22 | 42 contacts → | ||||
Partial evidence “Toro makes accessible enterprise application integration software.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 23 | 41 contacts → | ||||
Partial evidence “Layer7 API Security To get maximum value from data, your enterprise needs to seamlessly connect with mobile apps, cloud services and the Internet of Things.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 24 | 39 contacts → | ||||
Indirect evidence “Traefik Labs helps enterprises migrate, modernize, and transform any workload, across any environment.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 25 | 38 contacts → | ||||
Indirect evidence “Input OpenAPI.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: api development software companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names api development software companies.
- Partial evidence
- Its own public description names part of api development software companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name api development software companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 492 api development software companies worldwide
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Api development software companies worldwide at a glance
As of Sep 27, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among api development software companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for api development software companies are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “api development software companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names api development software companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among api development software companies, and records with no verified work email.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 4,366 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 27, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Api development software companies by location
3 lists · largest firstEvery Api development software companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names api development software companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many api development software companies are there worldwide?
RevenueBase identified 492 api development software companies worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Postman, headquartered in San Francisco, tops this list with the largest team on record.
Which country has the most api development software companies?
The United States leads with 119 companies, followed by India (51) and the United Kingdom (27). Every api development software companies list by country and city is linked on this page.
Which city has the most api development software companies?
San Francisco leads with 24 headquartered companies, followed by London (18) and Boston (7).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 4,366 verified decision-maker contacts tracked across these 492 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 27, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.