148 tools · 45 open-source · 103 SaaS
The best API tools. Ranked by real activity.
The top-ranked open-source API tool on Enlisted is Hoppscotch (81k GitHub stars), followed by Bruno and Kong. Among SaaS products, other tools on Enlisted are most often compared with Postman, Thunder Client and Apidog.
Enlisted lists 148 API tools: 45 open source and 103 SaaS. 18 of the open-source ones can be self-hosted on your own server or computer. The most common open-source licences here are Apache-2.0 (15 tools), MIT (14) and AGPL-3.0 (4). The open-source ones are most often listed as alternatives to Postman, Thunder Client and Apifox.
Last updated October 3, 2026 · ranked by GitHub stars, growth and recent commits
The top 48 of 148 API tools
Hoppscotch
API Tools
Helps you create requests faster, saving precious time on development.
MITvs Postman★ 81k
Bruno
API Tools
Bruno is the Git-native API client for REST, GraphQL, gRPC and Websocket. A local and open
MITvs Postman★ 47k
Kong
API Tools
🦍 The API and AI Gateway
Apache-2.0vs Apigee★ 44k
Insomnia
API Tools
The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. Wi
Apache-2.0vs Postman★ 40k
Hasura
Backend as a Service
Blazing fast, instant realtime GraphQL APIs on all your data with fine grained access cont
Apache-2.0vs AWS AppSync★ 32k
OpenAPI Generator
API Tools
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs
Apache-2.0vs Stainless★ 27k
Yaak
API Tools
The most intuitive desktop API client. Organize and execute REST, GraphQL, WebSockets, Ser
MITvs Postman★ 19k
Apache APISIX
API Tools
The Cloud-Native API Gateway and AI Gateway
Apache-2.0vs Apigee★ 17k
Scalar
API Tools
Scalar is an open-source API platform: 🌐 Modern RES
MITvs Postman★ 16k
OpenWA
API Tools
OpenWA - The free, open source WhatsApp API Gateway with a pluggable architecture. Self-ho
MITvs Twilio★ 15k
Nango
API Tools
Connect your agents & product to 1,000 APIs.
OSSvs Merge★ 12k
Tyk
API Tools
Open Source API and AI Gateway supporting REST, GraphQL, TCP, gRPC and MCP (Model Context
OSSvs Apigee★ 11k
Higress
API Tools
🤖 AI Gateway | AI Native API Gateway
Apache-2.0vs Amazon API Gateway★ 9.5k
Karate
Testing & QA
Test Automation Made Simple
MITvs Postman★ 9k
Mockoon
API Tools
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no
MITvs Beeceptor★ 8.4k
Newman
API Tools
Newman is a command-line collection runner for Postman
Apache-2.0★ 7.3k
Requestly
API Tools
Community hub for Requestly API Client — bugs, feature requests, and roadmap. The privacy-
OSSvs Postman★ 6.8k
Unkey
API Tools
The Developer Platform for Modern APIs
OSSvs Zuplo★ 5.5k
pREST
Backend as a Service
PostgreSQL ➕ REST, low-code, simplify and accelerate development, ⚡ instant, realtime, hig
MITvs Firebase★ 4.6kATAC
API Tools
A simple API client (postman like) in your terminal
MITvs Postman★ 3.7k
Cortex Docs
API Tools
Cortex - Generates interactive API documentation, typed SDKs, and MCP servers from OpenAPI
MITvs Mintlify★ 3.2k
DummyJSON
API Tools
DummyJSON.com provides different types of REST Endpoints filled with JSON data which you c
OSSvs Mockaroo★ 2.9k
API Dash
API Tools
API Dash is a beautiful AI-powered open-source cross-platform (Desktop & Mobile) API Clien
Apache-2.0vs Postman★ 2.9k
Restfox
API Tools
Offline-First Minimalistic HTTP & Socket Testing Client for the Web & Desktop
MITvs Postman★ 2.8k
KrakenD
API Tools
KrakenD Community Edition: High-performance, stateless, declarative, API Gateway written i
Apache-2.0vs Amazon API Gateway★ 2.7k
Insomnia Mockbin
API Tools
Insomnia Mockbin is the underlying backend for the API mocks capability of Insomnia. It is
OSSvs Beeceptor★ 2.1k
Resterm
API Tools
Terminal API client for HTTP, GraphQL and gRPC. Plain .http files you can diff and version
Apache-2.0vs Postman★ 2k
Voiden
API Tools
Design, Test and Document APIs in plain Markdown. Compose Requests with API blocks. Reuse,
Apache-2.0vs Postman★ 1.9kZato
Workflow Automation
ESB, SOA, REST, APIs and Cloud Integrations in Python
AGPL-3.0vs MuleSoft★ 1k
AnythingMCP
AI Infrastructure
Open-source, self-hosted MCP gateway: turn any REST/OpenAPI, SOAP, GraphQL, OData or SQL A
AGPL-3.0★ 716
Chapar
API Tools
Chapar is a simple and easy to use api testing tools aims to help developers to test their
BSD-3-Clausevs Postman★ 714curlie
API Tools
The power of curl, the ease of use of httpie.
MIT★ 3.7kROAPI
API Tools
Create full-fledged APIs for slowly moving datasets without writing a single line of code.
Apache-2.0★ 3.4k
CodeChat
API Tools
CodeChat - WhatsApp Api
Apache-2.0vs Twilio★ 1.3k
RustMailer
Email Clients & Servers
A self-hosted Email Middleware for IMAP, SMTP, Gmail API, Graph API — built for developers
OSSvs Nylas★ 508
Firecamp
API Tools
Developer-first OpenSource API DevTool, Postman/Insomnia alternative.
AGPL-3.0vs Postman★ 2.6k
HTTPie CLI
API Tools
🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON supp
BSD-3-Clausevs Postman★ 39k
Notion API Worker
CMS
Notion as CMS with easy API access
OSSvs Super★ 1.7k
DBAPI
API Tools
Build rest API with SQL in one minute
AGPL-3.0★ 801
HTTPie Desktop
API Tools
🚀 HTTPie Desktop — cross-platform API testing client for humans. Painlessly test REST, Gr
OSSvs Postman★ 4k
Orange API Gateway
API Tools
OpenResty/Nginx Gateway for API Monitoring and Management.
MITvs Apigee★ 2.3k
Mocky
API Tools
Generate custom HTTP responses, the simpler way to test your Web Services
Apache-2.0vs Beeceptor★ 2.1k
Step CI
Testing & QA
Automated API Testing and Quality Assurance
MPL-2.0vs Postman★ 1.9k
VulcanSQL
API Tools
Data API Framework for AI Agents and Data Apps
Apache-2.0vs Tinybird★ 793DataFire
Workflow Automation
A framework for building integrations and APIs
MITvs Zapier★ 575
0mcp
API Tools
Platform for launching and running production MCP servers so SaaS products work with AI agents
SaaS
1Lookup
API Tools
API for real-time phone, email and IP validation plus data enrichment on a shared credit balance
SaaS
42Crunch
Security
API security platform that audits OpenAPI definitions and protects APIs at runtime
SaaS
API tools: questions
- What is the best open-source API tool?
- Hoppscotch is the top-ranked open-source API tool on Enlisted, with 81k GitHub stars. It is followed by Bruno, Kong and Insomnia.
- What are the best free API tools?
- The top-ranked open-source API tools with a standard licence are Hoppscotch (MIT), Bruno (MIT) and Kong (Apache-2.0), so their code is free to use. 50 of the 103 SaaS products here have a free plan, including Postman, Thunder Client and Apidog.
- Which API tools can be self-hosted?
- 18 of the 45 open-source API tools on Enlisted can be self-hosted on your own server or computer; the top-ranked are Kong, Hasura and Apache APISIX.
- How are these API tools ranked?
- Open-source tools are ordered by a score built from GitHub stars, star growth over the last 30 days and how recently the code changed; 31 of the 45 had new commits or a release in the last 30 days. SaaS products have no public repository, so they get a fixed baseline score. GitHub data is refreshed daily, and nobody can pay to move up.