Find your next tool.
Find tools for your next project. Start with free options. Know the limits before you commit.
Free options first. Paid tools when you need more.
Supabase
Free plan · Add a database, login, and storage to your app.
500 MB database, 1 GB file storage, 50,000 MAUs, 2 active projects
Pricing checked Jul 2026 · Compare plans and costs
Ably
Free plan · Reliable pub/sub with guaranteed message ordering and offline catch-up
Free plan: 6M messages/month, 200 concurrent connections
Pricing checked Jul 2026 · Compare plans and costs
BetterUptime
Free plan · Uptime monitoring with on-call alerts
Free: 10 monitors & heartbeats, 1 status page, Slack/email alerts
Pricing checked Jul 2026 · Compare plans and costs
Expo
Free plan · Build and deploy React Native apps to iOS and Android from one codebase
Free plan: 15 Android + 15 iOS builds/mo, updates to 1K MAUs, 60 CI/CD minutes
Pricing checked Jul 2026 · Compare plans and costs
Express Rate Limit
Free · Drop-in rate limiting middleware for Express apps with flexible storage backends
Free and open source (MIT license)
Pricing checked Jul 2026 · Compare plans and costs
Firebase Cloud Messaging
Free plan · Google's free push delivery backbone used by millions of apps worldwide
Free at any scale on all Firebase plans
Pricing checked Jul 2026 · Compare plans and costs
Flagsmith
Free plan · Feature flags and remote configuration with both cloud and self-hosted options
Free plan: 50,000 requests/month, 1 team member, unlimited flags
Pricing checked Jul 2026 · Compare plans and costs
GitHub
Free plan · Store code and work on it together.
Free plan: unlimited public/private repos, 2,000 CI/CD minutes/month
Pricing checked Jul 2026 · Compare plans and costs
GitHub Actions
Free plan · Run tests and build checks on every pull request
Free for public repos and self-hosted runners; 2,000 free minutes/mo on private repos (GitHub Free)
Pricing checked Jul 2026 · Compare plans and costs
Google Calendar API
Free plan · Build a fully custom scheduling experience backed by Google Calendar availability
Free with usage quotas
Pricing checked Jul 2026 · Compare plans and costs
LaunchDarkly
Free plan · Industry-standard feature flag platform with targeting, experimentation, and audit logs
Developer plan: $0, unlimited seats, 1 project/3 environments, 5K AI runs/mo
Pricing checked Jul 2026 · Compare plans and costs
OneSignal
Free plan · Send targeted push notifications to iOS and Android users
Free plan: unlimited mobile push, 10K email sends/mo, web push to 10K subscribers
Pricing checked Jul 2026 · Compare plans and costs
Postman
Free plan · Test endpoints and auto-generate collections from your API
Free plan: 1 user, API client, mock servers, 1K monitoring requests/mo
Pricing checked Jul 2026 · Compare plans and costs
Pusher
Free plan · Managed WebSocket infrastructure that handles connections, scaling, and presence
Sandbox: free forever — 100 concurrent connections, 200K messages/day
Pricing checked Jul 2026 · Compare plans and costs
Pusher Beams
Free plan · Managed push notifications with per-device delivery receipts and analytics
Sandbox: free — up to 1,000 subscribed devices, unlimited notifications
Pricing checked Jul 2026 · Compare plans and costs
ReadMe
Free plan · Host polished, versioned docs with a built-in API explorer
Starter plan free: 1 project, 1 version, custom domain, interactive API reference
Pricing checked Jul 2026 · Compare plans and costs
Sentry
Free plan · Real-time error tracking and stack traces
Developer plan: 1 user, 5K errors, 5M spans, 50 replays, 5 GB logs
Pricing checked Jul 2026 · Compare plans and costs
Socket.io
Free · Full-featured WebSocket library with automatic fallback and room-based messaging
Free and open source (MIT license)
Pricing checked Jul 2026 · Compare plans and costs
Supabase Auth
Free plan · Built-in auth with social providers
Included in every Supabase plan — Free tier covers 50,000 MAUs
Pricing checked Jul 2026 · Compare plans and costs
Supabase Realtime
Free plan · Subscribe to Postgres table changes and broadcast them to connected clients instantly
Included in every Supabase plan with message/connection quotas
Pricing checked Jul 2026 · Compare plans and costs
Swagger UI
Free · Render an OpenAPI spec as browsable, try-it-now documentation
Free and open source (Apache 2.0)
Pricing checked Jul 2026 · Compare plans and costs
Unleash
Free · self-hosted · Open-source feature toggle service you can host on your own infrastructure
The software is free to self-host. Hosting and maintenance may cost extra.
Pricing checked Jul 2026 · Compare plans and costs
Upstash
Free plan · Serverless Redis with a per-request pricing model ideal for rate limiting counters
Free plan: 256 MB data, 500K commands/month, 10 GB bandwidth
Pricing checked Jul 2026 · Compare plans and costs
Vercel AI SDK
Free · Stream AI responses to your frontend
Free and open source (Apache 2.0)
Pricing checked Jul 2026 · Compare plans and costs
Web Push API
Free · Browser-native push standard that works without a third-party service
Free web standard built into browsers
Pricing checked Jul 2026 · Compare plans and costs
Zod
Free · Validate form inputs client and server side
Free and open source (MIT license)
Pricing checked Jul 2026 · Compare plans and costs
Kong
Free trial · Open-source API gateway with built-in rate limiting, auth, and routing plugins
No perpetual free Konnect tier — 30-day free trial with 1M API requests/mo analytics
Pricing checked Jul 2026 · Compare plans and costs
OpenAI
Paid · Add AI features to your app with an API.
No free API tier — pay per token from the first request
Pricing checked Jul 2026 · Compare plans and costs
Twilio Verify
Free trial · Send one-time passcodes via SMS or voice call with global delivery
No free tier — free trial available
Pricing checked Jul 2026 · Compare plans and costs
Free plans have limits. Pricing can change; check the provider before signing up.