InboxZen — Premium Email Productivity

InboxZen turns Gmail into a power-user inbox. Every feature Boomerang ($15/mo), Mixmax ($24/mo), and Streak ($59/mo) lock behind paid tiers — for free, fully backend-free. ✉ SEND LATER WITH GMAIL'S OWN SCHEDULER Click ⏰ in any compose, pick a time, InboxZen invokes Gmail's native "Schedule send" so your email is held by Google's servers and delivered at the chosen time — your computer can be off. Recurring sends use InboxZen's own chrome.alarms (browser must be open). Choose either mode per email. 📋 TEMPLATES WITH /SLASH SHORTCUTS Type /welcome + space in any compose to instantly expand your "welcome" template. Variables filled from the recipient: {{first_name}}, {{email}}, {{company}}, {{domain}}, {{date}}, {{time}}, {{weekday}}. ✨ AI COMPOSE, POLISH, TONE-SHIFT (BYOK) Bring your own API key for Anthropic Claude, OpenAI, Groq (free, no card), or Google Gemini. One click rewrites your email in any of these modes: • Smart reply for the thread you're viewing • Polish — fix grammar + flow • Professional / Casual / Friendly / Persuasive tone • Shorter / Longer / TL;DR • Translate to any language Unlike Grammarly, InboxZen does NOT log every keystroke. AI calls only fire when you press them, and go directly browser→provider — InboxZen has no server in the loop. ✨ AI SUMMARIZE THREAD Open any thread, press ✨ Summarize, get 2-4 bullets of action items + decisions in your browser language. ⚡ AI QUICK REPLIES (3 TONES) In any open thread, click ⚡ above the reply box. AI generates three drafts side-by-side: • Friendly acknowledgement (green) • Professional with a question (indigo) • Polite decline (rose) Click one → it flows straight into Gmail's reply box. 🤖 AI AUTO-CATEGORIZE INCOMING Toggle on in Settings. Each new inbox row gets a single-letter colored badge (Important / Updates / Promotions / Social / Personal / Spam). BYOK — one tiny call per email, cached locally. 📨 MAIL MERGE Upload a CSV with email + variable columns. Pick a template. InboxZen schedules every email staggered (default 60s apart) to avoid Gmail spam triggers. Variables in subject + body are filled per row. 🔄 SEQUENCES Multi-step outreach: send template 1, wait N days, send template 2 if no reply, repeat. Mixmax charges $24/mo for this. Designer + runtime included. 💤 SNOOZE Click 💤 on any thread → "Tomorrow 9 AM" or custom time → it's hidden and resurfaces with a desktop notification. 🔔 FOLLOW-UP REMINDERS Set "remind me in 3 days if no reply" right after sending. Notification fires if the thread hasn't moved. 🚀 BULK UNSUBSCRIBE 🚀 button in the inbox toolbar scans your visible inbox for emails with unsubscribe links, groups by sender, and one-click opens each sender's unsubscribe URL. 🧹 INBOX CLEANER 🧹 button groups visible rows by sender. Tick multiple senders → archives all matching emails in one stroke (uses Gmail's native archive keyboard shortcut). 🛠 AUTO-CC / BCC RULES When you compose to a specific recipient or domain, InboxZen auto-fills CC/BCC. Define rules like "always BCC boss when emailing client X". 🚫 BLOCK RULES Mark senders / domains / subject keywords as blocked → matching inbox rows are visually dimmed. Non-destructive: you decide whether to archive. 🖋 MULTIPLE CONTEXTUAL SIGNATURES Define signatures per domain or per subject keyword. The right one suggests itself. 📅 CALENDAR SLOT GENERATOR Calendly without an account. Define availability windows (weekdays, hours, slot duration). One click copies a list of next-available slots into your email body. Recipient picks one and replies. 📤 EMAIL-TO-TASK EXPORT Open any thread, click 📤 → Markdown copy of subject + senders + body + link goes to your clipboard. Paste into Notion, Stash, todo apps. ↩ EXTENDED UNDO-SEND Up to 5 minutes (Gmail's native is 30s max). Configurable in Settings. 📊 LOCAL INBOX STATS 14-day dashboard of sent / received / templates used / scheduled. All in IndexedDB on your device. 👥 LOCAL CONTACT MEMORY Every sender/recipient InboxZen sees gets tracked: total sent + received, last contacted, average response time. Add private notes per contact. 📡 EMAIL READ-TRACKING (BYOK CLOUDFLARE WORKER) Deploy a 50-line free Cloudflare Worker (100k requests/day, no credit card). InboxZen embeds a 1×1 pixel pointing at your Worker. When the recipient opens, your Worker logs the load to KV. Poll opens from your dashboard. Backend-free for us, $0 for you. 🌍 8-LANGUAGE UI English · Türkçe · Español · Deutsch · Français · Português · Italiano · 日本語. Auto-detected from your browser. 🔒 PRIVACY-FIRST • Zero analytics, telemetry, ad networks, or remote logging • Zero keystroke logging (unlike some competitors) • The extension itself has no outbound network code targeting any infrastructure we operate • AI features only fire on button press, BYOK direct browser→provider • Templates, signatures, settings sync via chrome.storage.sync (your own Chrome account) • Schedules, contacts, stats live in IndexedDB on your device ═══════════════════════════════ WHY ANOTHER GMAIL EXTENSION? Boomerang charges $180/year. Mixmax $288/year. Streak $708/year. Combined: $1,176/year for tools that mostly do the same thing. InboxZen gives you ~95% of what they charge for — for free. The trade-offs are honest: • Send-later uses Gmail's own server scheduler (best path, PC can be off) with InboxZen's alarm as fallback for recurring • AI is BYOK so you pay providers directly (Groq is free with no card; OpenAI/Anthropic charge cents per email) • Tracking requires you to spin up a 50-line Cloudflare Worker (free tier, 5-minute setup) • Recurring scheduled sends require browser open at fire time ═══════════════════════════════ CHANGELOG 1.0.0 — Initial release. 28 features. Backend-free. BYOK AI. ═══════════════════════════════ CREDITS • React + React DOM (MIT) — UI framework • Dexie (Apache 2.0) — IndexedDB wrapper • Anthropic / OpenAI / Groq / Google Gemini — optional BYOK AI endpoints (your key, your costs) • Cloudflare Workers — optional BYOK tracking pixel…