Spark

Spark is the email client that tries to give you back a sense of control over your inbox: it intelligently prioritizes important messages, groups newsletters, and adds collaboration features for teams managing shared emails.

Spark is an email client developed by Readdle, available for macOS, iOS, Windows and Android. Its main feature is the smart inbox system: Spark automatically classifies incoming emails into categories — personal, notifications, newsletters, pinned — bringing messages requiring attention to the top and hiding the noise. The snooze system lets you postpone an email to when you're ready to respond. Quick replies suggest short predefined responses for simple messages. The integrated AI (Spark AI) helps generate email drafts, summarize long threads and improve message tone. Team collaboration features let you share emails with colleagues, add internal comments and assign emails to specific team members — useful for shared inboxes. Spark supports Gmail, Outlook, Yahoo and any IMAP/Exchange account. The individual version is completely free; team features require a subscription.

For professionals and teams who receive many emails and want a client with smart prioritization, AI features for writing faster and collaboration tools for shared inboxes.

Spark is free for individual use with all main features, including basic AI, smart inbox and integrations. The Premium plan, at $4.99 per user per month, adds team collaboration features (shared inboxes, internal comments, assignments), more AI features and priority support. The Business plan adds SSO and enterprise features.