Spark alternatives

Thunderbird has quietly become good again. Since the Supernova redesign the interface has been steadily modernised, and the old power-user features — filters, multiple identities, extensions — never left. It's the obvious choice for anyone who wants a serious, free desktop client without a subscription or a vendor mining their mail. MZLA, a Mozilla subsidiary, develops it in the open, funded almost entirely by donations. It's still...

Canary Mail's pitch is privacy without friction: PGP encryption built in, so sending a sealed email doesn't require a weekend of key wrangling, plus on-device AI for drafting and summarising. It's cross-platform — Mac, iPhone, Windows, Android — which makes it a practical Spark alternative for people who aren't all-Apple. The free tier covers everyday use, with paid plans from about $36/year on the Growth tier. The interface isn't...

Mimestream is a native Gmail client built specifically for macOS — not an Electron wrapper, not a web view, but a proper AppKit application. It uses the Gmail API directly, so labels, stars, filters, and send-as aliases all work exactly as you'd expect. Thread-based view, swipe actions, unified inbox for multiple accounts, Markdown composing, and proper macOS keyboard navigation. Fast, memory-efficient, and looks like it belongs on...

Notion Mail reimagines Gmail with Notion's toolkit: inbox views you build like databases, snippets for repeated replies, and AI that auto-labels and sorts mail as it arrives. It's made for people who already run their life in Notion and want the inbox to feel like the rest of their workspace instead of a separate chore. The core app is free, which undercuts most Spark-style clients; some AI features require a paid Notion AI plan....

Superhuman is email as a speed sport: every action has a keyboard shortcut, the split inbox triages for you, and AI drafts replies and summarises threads in your voice. It's aimed at founders, salespeople, and anyone processing hundreds of messages a day — now part of Grammarly, which has only accelerated the AI features. At $30/month it's the most expensive way to do email, full stop. But if inbox time is genuinely your bottleneck,...