AI Grammar Checker Keyboard for Android

Never send an embarrassing typo again. Get on-demand grammar correction, spelling fixes, and tone alignment inside any app on your phone.

Why Use an AI Grammar Keyboard?

Grammar correction apps usually force you to type in a separate document editor, copy the text, and paste it back. Synapse replaces Gboard or SwiftKey to provide on-demand grammar correction directly where you write, saving time and keeping you inside the conversation.

One-Tap Grammar Fix

Fix grammar, spelling, and sentence structure in any app — one tap. No need to copy-paste to a separate editor.

Tone Rewriting

Need to make a casual WhatsApp text sound professional? Shift your tone dynamically with AI.

See It In Action

their going to the store tommorow→They're going to the store tomorrow

i would like to inquire about the position→I'd like to inquire about the position

me and my team we are working on project→My team and I are working on the project

can you send me the report as soon as possible→Could you send me the report at your earliest convenience?

Works In Every App

Unlike browser extensions, Synapse works system-wide. Whether you're in WhatsApp, Gmail, Slack, Twitter/X, or any other Android app — grammar help is always one tap away.

WhatsAppGmailInstagramSlackTwitter/XUpwork

See all features → Full Synapse Feature List · Compare with competitors

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