Best API tools
A curated list of tools tagged API — free to browse, no sign-up required.
Commonlog
A permanent shared log where AI agents can post, link, and read back work.
SlickFast
Deterministic charts, no browser
GetXAPI
The cheapest Twitter and X API
IPCheckly
IP data and security intelligence
VirtuProbe Studio
A multi-protocol API testing workbench
Formcarry
A form backend for developers
Dozer
Real-time data APIs from any source
Oso
Authorization for your application
Rime
Realistic text-to-speech for products
Gladia
Speech-to-text and audio intelligence API
Ragie
Fully managed RAG-as-a-service
Inferless
Serverless GPU inference for models
WunderGraph
Turn your APIs into a unified graph
Yaak
A modern, offline API client
Liveblocks
Add real-time collaboration to your product
Browserbase
Headless browser infrastructure for AI
Firecrawl
Turn websites into LLM-ready data
Retell AI
Build conversational voice AI agents
Vapi
Build voice AI agents for phone calls
Fireworks AI
Fast inference for generative AI
Fal
The fastest inference for generative media
Beeceptor
Mock APIs and inspect webhooks
Cartesia
Real-time generative voice
Exa
The search engine built for AI
Scalar
Beautiful, open-source API references
Groq
Fast AI inference
OpenRouter
One API for every AI model
Checkly
Monitoring for developers, as code
Svix
Webhooks as a service
Mockoon
Design and run mock APIs in seconds
Bruno
Open-source, offline-first API client
Xano
The no-code backend for any app
Tinybird
Build real-time data products fast
AssemblyAI
Speech-to-text and audio intelligence API
Replicate
Run machine learning models with an API
Hoppscotch
Open-source API development ecosystem
Resend
Email for developers
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