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Bring grammar correction, translation, and custom AI prompts directly into WhatsApp. Your typing stays in the chat; only text you send to a prompt goes to the AI.
Synapse Keyboard is an Android keyboard that brings on-demand AI grammar, translation, and prompt-based writing help into WhatsApp chats.
Tired of typos in your WhatsApp messages? Synapse stays right at your fingertips. Select your text, tap a prompt — Synapse runs AI and replaces your text when the answer is ready, usually a few seconds. Translate messages via AI prompts without leaving the chat or using external translation apps.
Communicate across language barriers. Save a “Translate to [language]” prompt, select your text, and tap it — no switching apps, everything happens in your WhatsApp chat window. Translation runs through AI, so test your prompt with your language pair — quality varies by language.
If you only want to style a message, try our free WhatsApp text formatter — it turns plain text into WhatsApp bold, italic, strikethrough, and monospace in one tap, right in your browser.
Explore all features → Synapse Feature Overview · AI Grammar Checker
Yes. Synapse is an Android system keyboard, so it works in WhatsApp the same way it works in every other app: select your text in the chat, tap the Synapse icon, pick a prompt, and the AI result replaces your text right in the message box.
Yes — save a 'Translate to [language]' prompt, select your text, and tap it. Translation happens inside the chat without switching apps. Quality varies by language pair, so test your prompt first.
No. Synapse is just a keyboard — there's no WhatsApp mod, no rooting, and no plugin. You install the keyboard once and it's available in any chat.
Normal typing never leaves your phone. Only text you explicitly select and send to an AI prompt is processed, and those prompts and responses are stored in your account history. Password and OTP fields are never touched.
The keyboard itself is free with 20,000 free credits on signup. AI actions use small amounts of credits, and you top up pay-as-you-go starting at $5 — no subscription.