Spello — Spell & Grammar Checker

About

Spello is a free spell checker and grammar checker that works entirely on your device. As you type — in search boxes, forms, Gmail, Outlook, Notion, and most websites — Spello underlines spelling and grammar mistakes in red, right in the text. Click a suggestion to fix it instantly. No account, no subscription, no sign-up.

Why Spello is different: it runs 100% on your device. Your writing is never uploaded, never sent to a server, never logged, and never sold. Independent research in 2026 found that most AI writing extensions collect user data — some even capture your keystrokes. Spello was built to be the opposite: a private spell checker that keeps your words yours.

FEATURES
- Real dictionary spell checking with smart, pick-the-right-word suggestions
- Grammar checking: a/an, "could of" → "could have", repeated words, spacing, and more
- Red underlines directly in the text — even inside Gmail and other rich editors
- Personal dictionary — add names and jargon so they're never flagged
- Per-site on/off toggle
- Lightweight — no browser slowdown
- Works on any Chrome and any computer — no special AI hardware required

WHAT YOU WON'T GET
- No sign-up, no account
- No subscription, no surprise auto-renewals
- No ads, no tracking, no data collection
- No network access — Spello works completely offline

Whether you're writing emails, filling forms, posting online, or writing in a language that isn't your first, Spello is a fast, private, free spelling and grammar checker for Chrome — a privacy-friendly alternative to cloud-based grammar checkers.

Free spelling and grammar checking that respects your privacy. Your words stay yours.