Vithos vs Spark
Team inbox and AI assistant versus local-first Mac speed.
Spark is built for people who live across phone and desktop, want a smart inbox, and often share mail with a team. That is a real job; it is just not the job Vithos is for.
Vithos is a keyboard-first Gmail client for Mac. Mail stays on your disk, search is local, offline works fully, and AI stays in the background (tags, one-line descriptions, one-click actions), no chatbot theater. If your complaint is that other clients read your mail on their servers, this is the wedge.
Side by side
Vithos and Spark, feature by feature. Last checked 2026-09-18.
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Sources: Spark.
Why people switch
Mail on your Mac
Vithos keeps desktop mail in local storage. When you use API, MCP, or AI features, Workers fetch what they need transiently; they do not keep message bodies as the product.
Desktop chords, not mobile chrome
Spark optimizes for a shared, cross-device inbox. Vithos optimizes for one Mac, one keyboard, one palette: j/k, archive, Waiting On, ⌘K.
AI without the chatbot
Vithos is not an AI email app. Enrichment stays quiet. If you want an agent in the loop, you bring your own over MCP.
Choose the other product if
Choose Spark if you need iPhone plus Mac plus a shared team inbox. Vithos is Mac-only and waitlist-first.
Pick Spark if you need phone + team shared inbox. Pick Vithos if you want a keyboard-first Gmail client for Mac with mail that stays local.
Smarter, simpler email
Your fastest path through Gmail, designed around the keyboard and built to work locally.
macOS 14+ · Apple Silicon · Gmail · waitlist · 7-day trial after access