SenderStack

SenderStack is an AI-powered email and writing assistant — delivered as a Gmail Chrome extension — that drafts, summarizes and translates emails, chats across multiple AI models (ChatGPT, Claude, Gemini, DeepSeek) and lets you query PDFs. It has no TrustRadius listing; the Chrome Web Store shows 4.9/5 from just 7 ratings and 34 users. The Dealify lifetime deal is $119 (65% off $343).

What is SenderStack?

SenderStack is an AI email and writing assistant that lives inside Gmail as a Chrome extension. It drafts replies from a few bullet points, summarizes long threads, translates across 90%+ languages, and lets you create up to 10 custom AI "personalities" that you can train by uploading PDFs — so replies come out in your voice. A separate chat dashboard gives multi-model access to ChatGPT, Claude, Gemini and DeepSeek, plus ChatPDF for querying documents. The founder is Martin Kamata; the company's registered address is a Delaware registered-agent office. It has a free plan and a 14-day trial, with the Dealify lifetime deal at $119 (65% off a $343 sticker — itself higher than the vendor's $199 lifetime price). The product's footprint is very small: 34 users and 7 ratings on the Chrome Web Store, and no TrustRadius, G2 or Capterra presence. For a tool that reads your inbox, that lack of validation plus Gmail-only support and daily reply caps makes it a modest bet at best.

Key Features

• *AI Email Drafting** — write polished, on-brand emails from short prompts or bullet points, with tone presets (professional, friendly, assertive, casual)
• *Smart Summaries** — one-click condensation of long email threads into actionable overviews
• *Custom AI Personalities** — up to 10 personalities, trainable by uploading a PDF so replies match your voice
• *ChatPDF** — upload a document and chat with it to extract key points
• *Multi-Model AI Chat** — access ChatGPT, Claude, Gemini and DeepSeek from one dashboard
• *Multilingual Support** — translate and reply across 90%+ of global languages
• *Email Analytics Dashboard** — open rates, reply patterns and engagement insights
• *Automations** — automated email responses, scheduled follow-ups and AI-driven workflows

Who is it for?

• Gmail users who answer a lot of repetitive email and want drafts, summaries and translations on hand
• Customer-service and support agents who want a consistent voice in replies
• Non-native speakers who want polished, translated email replies
• People who want one tool with multi-model AI chat plus inbox writing

Who is it NOT for?

• Outlook or Apple Mail users — Gmail-only for now
• Heavy inboxes — 125 AI replies/day and one-account-per-license caps bite
• Anyone who needs email prioritization now (still in development)
• Privacy-sensitive users who are uncomfortable with an AI extension reading their inbox, given the lack of independent validation