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There's no single "best" AI keyboard — it depends on what you type and what you'll pay. Here's what Synapse, Grammarly, SwiftKey, and Gboard actually do in 2026.
| Feature | Synapse | Grammarly | SwiftKey (Copilot) | Gboard |
|---|---|---|---|---|
| Custom free-form AI prompts | ✅ Any instruction | ❌ No | ❌ Fixed tools | ❌ No |
| Grammar fixing | On-demand | ✅ As you type (its strength) | Via Copilot rewrite | ✅ Proofread (select devices) |
| Tone rewrite | ✅ Via prompts | ✅ Premium | ✅ Free presets | ✅ Select devices |
| Translation | Via AI prompts | ❌ No | ✅ Built-in translator | ✅ Built-in |
| Swipe / autocorrect / prediction | ❌ None | Basic | ✅ Excellent | ✅ Excellent |
| Voice typing | ❌ No | ❌ No | ✅ Yes | ✅ Yes |
| AI on any Android 8+ phone | ✅ Yes | ✅ Yes | ✅ Yes | ⚠️ AI tools need Pixel 9/10-class hardware |
| Price | Free + pay-as-you-go from $5, no subscription | Free basic; Premium ~$12/mo annual, $30/mo monthly | Free (Microsoft account for AI) | Free |
| Install | APK sideload | Play Store | Play Store | Pre-installed / Play Store |
| Crypto payments | ✅ Yes (+30% bonus) | ❌ No | ❌ No | ❌ No |
SwiftKey and Gboard are better everyday typers — swipe input, autocorrect, prediction, voice typing, and huge language support, all free. Grammarly is better if you want passive as-you-type correction with underlines. All three install from the Play Store; Synapse is a sideloaded APK. If those basics matter more to you than custom AI prompts, a mainstream keyboard is the better pick — some people keep both and switch keyboards when working.
Synapse is the only one of the four where the AI takes your own instructions — not a fixed menu of "rewrite" and "proofread", but any prompt you write, in any app, on any Android 8+ phone, paid per use with no subscription. Get 20,000 free credits to test everything, then top up from $5 with no recurring charges. It also collects nothing from normal typing: no cloud sync, no learning, no typing analytics.
Who it's for: freelancers and chat-heavy users who write in WhatsApp, Gmail, Upwork, or Slack all day and want a real AI assistant at the cursor — and who are comfortable installing an APK. Synapse has no swipe typing, autocorrect, prediction, or voice input, and its typing layout is English only.
Deep dive → All Synapse Features · AI Grammar Checker · WhatsApp Keyboard
Synapse is free to download and includes 20,000 free AI credits on signup. After that, you top up pay-as-you-go starting at $5 — there is no monthly subscription and no recurring charge. Credits are non-refundable, so start small and test with the free credits first.
Yes. Synapse is a full Android keyboard, so it works system-wide — WhatsApp, Gmail, Instagram, Slack, and every other app. Grammar fixes, translation, and custom AI prompts run directly inside your chat window.
No. Unlike Grammarly Premium (around $12/month billed annually, or $30 billed monthly), Synapse uses credit-based pricing. You only pay when you actually use AI, and credits never expire between top-ups.
SwiftKey and Gboard now include AI tools (tone rewriting, proofreading), but they are fixed menus. Synapse takes your own free-form instructions: on-demand grammar correction, translation via prompts, tone rewriting, and unlimited custom prompts you define yourself — on any Android 8+ phone. SwiftKey and Gboard are better at typing basics like swipe input, autocorrect, and voice typing.
Yes. Synapse accepts USDT and other coins via crypto payments, with a +30% energy bonus on crypto top-ups. Send the exact amount shown at checkout — network and exchange fees aren't covered.
Synapse supports Android 8.0 and above. Normal typing stays on your device — only the text you explicitly send to an AI prompt leaves your phone, and those prompts and responses are saved to your account history. Google sign-in is required, and the app is installed via APK (Android shows its standard sideload warning).