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Top 8 Unified APIs Software Companies (October 2026)

As of October 2026, Latka tracks 8 unified APIs software companies. They have combined revenues of $48.8M and employ 267 people. They have raised $134.4M and serve 15K customers combined.

Every company below sells unified APIs software to other businesses and is ranked by its most recent annual revenue. Revenue, funding, headcount and customer figures come from CEO interviews on the Latka podcast, public company filings, and Latka estimates where a company has not disclosed a number.

What Unified APIs Software Companies do

Unified APIs software refers to a category of application programming interfaces that consolidates multiple APIs into a single, standardized interface. This allows developers to interact with various software services more efficiently, minimizing the need for extensive coding and integration efforts. Common use cases include enabling seamless data exchange across platforms, simplifying access to complex APIs, and enhancing user experiences by providing streamlined functionality across different applications. The primary features of unified APIs typically involve abstraction layers that normalize data formats, unify authentication processes, and create a standard endpoint for various integrations. Typical user personas include software developers, integration specialists, and IT practitioners, who leverage these tools to simplify workflows and improve operational efficiencies across diverse systems. Companies looking to implement unified APIs benefit from quicker deployment times and reduced maintenance overhead, allowing them to focus on developing core functionalities and innovative solutions.

Companies
8
Revenue
$48.8M
Funding
$134.4M
Employees
267

Filters

Sorting: Highest -> Lowest

Filters

Top Unified APIs Software Companies by revenue

Showing 8 of 8 companies ranked by annual revenue.

1Merge logo
Merge

San Francisco, California, United States

Merge is a San Francisco-based B2B software company that provides unified APIs, allowing software companies to offer dozens of integrations across HR, applicant tracking, accounting, and related categories through a single connection. Co-founded by Gil Feig and Shensi Ding-Lopez, the company launched out of stealth roughly two and a half to three months before this July 2021 interview, having spent the prior six months building its platform before adding any integrations. As of mid-2021, Merge had 280 organizations signed up on its platform, with 40 to 50 fully embedded and paying customers. The company raised a $4.5 million priced seed round from NEA, with Scott Sandell joining the board, and was targeting $1 million in ARR by the end of 2021, implying roughly $83,000 in monthly recurring revenue by December. With a 12-person team, the company was adding two to three new integrations per week and had processed hundreds of millions of API requests since launch. Merge competes in the integration infrastructure space and counts Flatfile as both a peer and a customer-facing partner, while distinguishing itself from horizontal tools like Zapier and Workato by offering vertical-specific, normalized data APIs built for enterprise-grade scale.

Revenue
$20.8M
Customers
40
Year founded
2020
Funding
$74.5M
Team size
104
2useagave.com logo
useagave.com

San Francisco, California, United States

Agave provides a unified API for data access across various construction software platforms. It operates as a Provider of API for integration of construction software.

Revenue
$15.6M
Year founded
2021
Team size
63
3StackOne logo
StackOne

London, England, United Kingdom

Supercharge your SaaS product's integrations in only a few days with our standardized unified APIs.

Revenue
$4.7M
Year founded
2023
Funding
$23.6M
Team size
43
4Kloudless logo
Kloudless

Berkeley, California, United States

Kloudless unifies features and data models across many SaaS APIs, allowing developers to easily integrate their apps with any SaaS provider. Code once, integrate many. Zero API maintenance.

Revenue
$2.7M
Customers
15K
Year founded
2014
Funding
$7.3M
Team size
12
5Composio logo
Composio

San Francisco, California, United States

Composio is a toolset designed to empower AI agents with seamless interactions with software applications and system tools. Featuring built-in authentication management and support for actions and triggers, Composio enables users to integrate external tools swiftly, helping them go live within hours. Composio enhances AI agents' capabilities, enabling them to execute code, interact with local systems, and integrate with over 200 external tools, thus simplifying complex integration tasks and letting users focus on their primary objectives. It also supports custom tool development, allowing developers to build tailored solutions.

Revenue
$2M
Year founded
2023
Funding
$29M
Team size
18
6Integration App logo
Integration App

United States

Integration App presents the Universal Integration Layer. The turnkey solution for scaling your customer-facing integrations with any SaaS app, any use case. The company was built by a team of ex-DataRobot early employees. The product is built on the strengths of previous generations by combining the standardization and turnkey nature of Unified APIs with the ease and scalability of more customized Embedded iPaaS solutions. Unlike IpaaS platforms or unified APIs, Integration App operates at a lower level of infrastructure, giving developers multiple building blocks to assemble any kind of customer-facing integration with full flexibility and control. This eliminates the traditional blockers of these approaches, such as rigid, static data sets and the need to build multiple integrations one at a time. You can choose to integrate any of our 3000+ connectors across various SaaS categories (CRMs, task management, accounting, etc.) or build your own custom connector for any app with an OpenAPI spec using LLM-powered features for scraping API docs and mapping data. Integration App is used by 100+ B2B Saas companies like Quickbase, Adeptia, Storyblok, Spekit, JustPaid & many others.

Revenue
$1.8M
Team size
16
7Quikk API logo
Quikk API

Nairobi, Kenya

Streamlined access to APIs in Africa. Quikk helps companies & developers connect to digital financial service providers in Africa through a unified API. Digital Financial services require significant levels of care, and the Quikk API keeps companies & developers secure and compliant. Quikk brings simplicity and standardisation to complex API labyrinths.

Revenue
$660K
Year founded
2021
Team size
6
8Revert logo
Revert

Middletown, DE, United States

Revert makes it incredibly easy to build integrations with any third party API. With Revert Unified API, you can integrate with CRMs, marketing automation platforms, ticketing tools, file storage systems and accounting tools. Oh! And we are open-source too! Join our stargazers here: GitHub → https://github.com/revertinc/revert ⭐ Our community here: Discord → https://discord.gg/q5K5cRhymW 👾

Revenue
$550K
Year founded
2022
Team size
5

Frequently asked questions about Unified APIs Software Companies

How many unified APIs software companies are there?

Latka tracks 8 unified APIs software companies with reported revenue. Together they generate $48.8M in annual revenue and employ 267 people.

Which unified APIs software company is the largest?

Merge is the largest, with $20.8M in annual revenue, founded in 2020.

How much revenue does a typical unified APIs software company make?

The average unified APIs software company in this list makes $6.1M a year, across 8 companies with reported revenue. They serve 15K customers combined.

Who are the leading Unified APIs software vendors?

Ranked by annual revenue, the leaders are Merge, useagave.com, StackOne, Kloudless and Composio.

How much funding have unified APIs software companies raised?

The 8 unified APIs software companies tracked here have raised $134.4M in disclosed funding between them.

Related Development Software categories

Inclusion Criteria

- The software must provide a single interface for accessing multiple APIs. - It should enable data normalization and transformation across different applications. - The solution must simplify authentication processes for users. - It should support various integration scenarios, including real-time data access. - The product is not just an API management tool; it must offer comprehensive features for integration and data handling.