CloseInbox is
open source.
CloseInbox is now fully open source and free for everyone, forever.
The commercial service has been shut down. The full source code — AI intent detection, inbox management, platform integrations — is yours to fork, self-host, and build on.
Integrates with your cold email stack
// features
Everything you need.
Nothing you don't.
Built for outbound sales teams who need to process cold email replies at scale — without the overhead.
Smart Intent Detection
AI reads every reply and instantly categorizes it — Interested, OOO, Not Interested, Objection, or Referral. No manual sorting, ever.
Unified Priority Inbox
All high-priority conversations from every client account, every sending inbox, aggregated into one clean view.
One-Click Handling
Draft AI responses, snooze objections for follow-up, or book a meeting — straight from the inbox, in one click.
Unlimited Reply Handling
No reply caps, no overages, no surprises. Process tens of thousands of cold email replies without worrying about hitting a limit.
Bring Your Own Key (BYOK)
Plug in your own OpenAI, Gemini, or Anthropic API key. You control the AI, you control the cost.
Fully Open Source (MIT)
Every line of code is on GitHub under the MIT License. Fork it, self-host it, white-label it, or build on it — no restrictions.
// stack
Modern, proven tech.
Everything deployed on your own infrastructure. You own the stack, the data, and the code.
Take the code.
Build something great.
MIT License. No restrictions. Fork it, self-host it, white-label it, or build an entirely new product on top of it.
View on GitHub