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TabMail vs UsingOpen

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

TabMail compared with UsingOpen
DetailTabMail logo TabMailUsingOpen logo UsingOpen
What it doesAgentic AI email assistant with zero data retention for iOS and Thunderbird Free AI chat with open models, no account or sign-up required
StageNot given Not given
FoundedNot given Not given
Based inCA Not given
Pricing modelFreemium Free
PricingFree 2-week trial (eligible new accounts). TabMail Zero: brings your own API keys (OpenAI, Anthropic, Google). TabMail Basic: CAD $15.00 per month (includes TabMail Voice for macOS, agentic dictation, unlimited email autocompletion and AI agent requests, limited priority AI agent requests, good for Free with 10 prompts per day. UsingOpen Studio desktop app is $19 USD one-time purchase, or ¥99 CNY in mainland China.
Key features
  • Voice dictation with context awareness for composing and editing emails
  • Suggested email replies with AI composition
  • Email triage and inbox management
  • AI-powered inbox assistant for research and answering questions
  • Agentic mode with calendar, contacts, files, web search integration
  • Support for Gmail, Outlook, iCloud, and IMAP accounts
  • Zero data retention for email and calendar content
  • On-device personalization data storage on iOS
  • Toggleable AI features with privacy controls
  • Access to 20+ open-weight AI models including DeepSeek, Qwen, GLM, Gemma, GPT-OSS, Kimi K3 and MiniMax M3
  • No account required, no sign-up, no email or password needed
  • 10 free prompts per day, reset at midnight UTC
  • Chat history saved locally on your device, never sent to servers
  • Streaming responses with visible reasoning for thinking models
  • Compare two models side by side in the same conversation
  • Live model availability status and real-time capacity information
  • Responsive design, installable as standalone mobile app
What makes it different
  • Zero data retention: email and calendar content processed transiently without server storage
  • Open source: Thunderbird add-on and iOS app are publicly available on GitHub for transparency and contribution
  • Works with existing inboxes: no vendor lock-in, integrates Gmail, Outlook, iCloud, and IMAP
  • Agentic dictation understanding technical terms and acronyms through screen context
  • Built on trusted open source: Mozilla Thunderbird foundation with modern ML capabilities
  • Complete privacy - chat history stays only on your device and is never sent to servers
  • Model picker with real-time availability, not a single locked-in assistant
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)3 no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)11
Citation Flow (Majestic)1917
Referring domains (Majestic)425

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