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Cold Email Killer
Cold Email Killer is an open-source script finds cold emails in Gmail, labels them, and archives them automatically.
Cold Email Killer is an open-source script that runs on Google Apps Script inside your own Google account to process incoming mail. It checks your inbox every 10 minutes, separates cold outreach from real messages, and archives unwanted emails with a specific label. You can use rule-based filtering or connect an AI provider such as Gemini, Claude, OpenAI, or a self-hosted option like Ollama or LM Studio. It preserves communication from people you have previously emailed, active reply threads, company colleagues, newsletters, and calendar invites. The project includes a settings page where you can manage confidence levels, AI keys, and allowlists.
Cold Email Killer at a glance
Key features
- Finds and labels cold emails in Gmail
- Runs automatically every 10 minutes on Google Apps Script
- Supports Gemini, Claude, OpenAI, and self-hosted models
- Excludes previous correspondents and calendar invites
- Includes adjustable confidence levels and dry-run mode
- Provides a web-based settings page
Use it for
- Filtering sales pitches and cold outreach from your main inbox
- Automating email management using self-hosted AI models
- Organizing incoming mail with custom rules and labels
Alternatives to Cold Email Killer
- Umbra Mail — It keeps mail private with no tracking and optional local AI.
- Klar — Runs fully on the Mac without sending messages to the cloud.
- GmailClass — Classifies inbox emails using custom descriptions and color-coded labels.
- bytemail — Connects directly to email providers without using intermediary servers.
- Nuvrail — Stages every AI agent email write and send for human sign-off before reaching the mail server.
- Claire Mail — Combines mail, calendar, reminders and AI triage in one fast app for Mac and iPhone.
- Clotr — Runs locally with no network or accounts required.
- Resend Inboxes — Build workflows, share inboxes, and connect AI agents directly to email.
- FutureMail — Unlimited addresses and agent-native APIs for one fixed monthly price.
- Dafeiyu Cleaner — Detects and removes AI bot comments locally without touching Bilibili's servers.
- Curier — Keeps all mail data locally on the Mac with no intermediate servers.
- Clutterstrike — Provides immediate validation of suspicious digital communications.
All Cold Email Killer alternatives