Ultra‑light, Blazing‑fast & Privacy‑First
Email Client
Cold start ≤1.5s · Sync 100 emails ≤3s · Idle memory ≤80MB · Local instant search
Built for power users with massive inboxes
Available for Windows, macOS, and Linux
Engineered Performance Targets
Designed for speed, optimized for efficiency
All metrics are target values under continuous optimization. Actual performance may vary based on hardware and email volume.
Built for Performance
Lightning fast, privacy-first email client.
Speed
Instant Local Search
Index millions of emails, query in <50ms.
Ultra-light Footprint
Idle memory ≤80MB with optimized threads.
Optimized Sync
Sync 100 recent emails in ≤3s.
Productivity
Multi-Account Support
Gmail, Outlook & custom IMAP/SMTP.
Rich Composer
Attachments, formatting, autosave drafts.
Folder Management
Efficient organization & filtering.
Privacy
Offline & Private
All data stored locally in SQLite.
No Telemetry
Zero tracking or analytics.
Secure Tokens (Planned)
Platform encryption for OAuth tokens.
Reliability
Background Sync
Stay up-to-date with minimal resource use.
Robust Index
SQLite-based high performance store.
Attachment Handling
Fast uploads & inline previews.
Lightning-Fast Search
Local indexing enables millisecond queries without remote server delays.
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💡 Interactive demo showing local indexed search response time
Instant Results
Type and search, <50ms response
Full-Text Index
Sender, subject, body coverage
Fully Offline
No network dependency, private
Privacy & Security
Your data belongs to you. Privacy protection is our top priority.
Local SQLite Storage
Email metadata and content stored locally. Fully offline capable, no cloud exposure risk.
Zero Telemetry
No usage data collection, no behavior tracking, no analytics reporting.
OS Keychain Protection
Passwords & OAuth2 tokens stored in OS keychain (Windows Credential Manager / macOS Keychain) with system-level encryption.
OAuth2 Secure Auth
Gmail & Outlook OAuth2 support. Tokens auto-chunked to bypass platform length limits.
Open Source Transparency
MIT licensed open source. All code auditable, community-driven, no hidden backdoors.
Direct IMAP/SMTP
Direct connection to email servers, no intermediary proxies, transparent communication.
✅ Implemented: Passwords and OAuth2 tokens migrated to OS keychain, no longer stored in app database.
📋 Current: Email content and attachments stored locally in plaintext. Future versions will implement AES-GCM encryption with user key.
How ColiMail Compares
See how ColiMail outperforms traditional email clients on key metrics.
| Metric | ColiMail | Thunderbird | Outlook | Apple Mail |
|---|---|---|---|---|
| Cold Start Time | ≤1.5s | ~8s | ~5s | ~3s |
| Idle Memory | ≤80MB | ~400MB | ~500MB | ~200MB |
| Package Size | ≤30MB | ~150MB | ~2GB | Built-in |
| Local Search | <50ms | ~500ms | ~200ms | ~100ms |
| Sync 100 Emails | ≤3s | ~10s | ~8s | ~5s |
| Multi-Account | ✓ | ✓ | ✓ | ✓ |
| OAuth2 Support | ✓ | ✓ | ✓ | ✓ |
| No Telemetry | ✓ | ✓ | ✗ | ✗ |
| Cross-Platform | Win/Mac/Linux | Win/Mac/Linux | Win/Mac | Mac only |
Cold Start Time
Idle Memory
Package Size
Local Search
Sync 100 Emails
Multi-Account
OAuth2 Support
No Telemetry
Cross-Platform
Benchmarks measured on Windows 11, i7-12700K, 16GB RAM. Results may vary by system configuration.
Performance Benchmarks
Real-world performance comparison across key metrics.
Performance Benchmark Comparison
ColiMail's advantage in key performance metrics
Benchmarks are updated with each major release to reflect the latest optimizations.
Version History & Roadmap
Track our progress and see what's coming next.
Released Versions
- Fixed Google OAuth desktop flow with deep link protocol
- Resolved authentication deadlock in callback handling
- Enhanced OAuth callback page with success indicators
- Complete Supabase authentication system
- Email/password registration with verification
- Google OAuth login integration
- Guest mode for full offline functionality
- 13 email provider presets (Yahoo, iCloud, Zoho, etc.)
- Connection testing before account creation
- OAuth2 email input validation
- Improved IMAP compatibility with GMX and 163.com
- OS-native credential encryption (Windows Keyring, macOS Keychain)
- Removed plaintext password storage from SQLite
- OAuth2 token encryption with automatic chunking
- Secure token storage with hash-based keys
Planned Features
- AES-GCM encryption for local email content
- Calendar integration with event management
- Multi-language UI support (English, Chinese, Japanese)
- Advanced email filtering and rules engine
- Log viewer UI in settings with export functionality
- Subscription/billing management interface
- Enhanced notification settings dialog
- Contact management system
- Production-ready stable release
- Full platform encryption for all sensitive data
- Advanced search with filters and saved searches
- Email templates and signatures
Want to see detailed changes? Check out the full changelog.
View ChangelogStay Updated
Get notified about new releases and performance benchmarks.
Get Started
v0.5.0-fix2Download ColiMail for your platform. Auto-detects your operating system.
Released on: 2025-11-01 · View Changelog
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