Stop chasing ghosts
in your API
Polter.io is a desktop reverse proxy that intercepts, mocks, and records API traffic — so you can build frontends without waiting on backends.
Everything you need to
develop without blockers
No backend? No problem. Polter.io gives you a fully controllable API layer running on your machine.
Smart Interception
When your backend returns a 404 or an endpoint doesn't exist yet, Polter.io automatically serves your locally-defined mock — no config toggling required.
Virtual Hosts
Run multiple proxy targets simultaneously with independent routing, SSL, and mock configurations — mirror your full staging environment locally.
Real-time Traffic Log
Monitor every request and response in real-time. See exactly what's proxied vs mocked with full headers, bodies, and timing data.
Recording Sessions
Record live API traffic and convert it to mock rules in one click. Bootstrap your mock library from real production data.
Local HTTPS / SSL
Automatic TLS certificate generation with a local CA. Trust the Polter.io CA once and get green locks for all your local domains.
Config Import / Export
Share your entire proxy + mock setup with your team via a single JSON file. Onboard new devs in seconds, not hours.
From zero to mocking in
under two minutes
Add a Virtual Host
Point Polter.io at your API target — e.g. api.myapp.dev → localhost:3000. HTTPS is auto-configured.
Define mock rules (or record them)
Create JSON mock responses for endpoints that don't exist yet, or hit Record and let Polter.io capture real traffic into mocks.
Develop without blockers
Requests that hit a live endpoint pass through. Requests that return 404 get your mock instead. No code changes, no toggles.
Start free. Upgrade when you need more.
Polter.io is free for solo devs with limits. Go PRO to unlock the full power.
Free
- 1 active project at a time
- Up to 3 mocked endpoints
- Manual JSON responses only
- HTTP traffic only (no SSL)
Pro
Save 30%- Unlimited projects & vhosts
- Unlimited mocked endpoints
- AI-powered data generation
- Full HTTPS / SSL & certificates
- Chaos Engine (lag & error simulation)
- Swagger / Postman import
- Recording & replay sessions
- Request/response transformers
- Team collaboration & sync
