One AI Keyboard for
Every App You Type In
WhatsApp, Gmail, Reddit, Upwork — wherever you type, tap one button and get AI help instantly. No copy-pasting to ChatGPT. No app switching. Just type your prompt and get the answer.
Works in any app
No Limits — Ask Anything
Grammar, translation, writing, coding — ask the AI whatever you want and get the answer directly in your keyboard.
Energy Credits Dashboard
Track remaining energy, daily usage, and prompts in real-time — synced instantly between mobile app and web.
Custom AI Prompts
Create, edit, and manage personal AI prompts from any device. Changes sync instantly to the keyboard.
License Key Redemption
Redeem Gumroad license keys to instantly credit energy to your account. No delay, no friction.
AI Rewrite & Translate
Highlight any text and tap the AI button to rewrite, improve grammar, change tone, or translate — right inside any app.
Theme Customization
Personalize your keyboard's look with multiple themes, font sizes, and layout configurations to suit your style.
Text Shortcuts
Set a short trigger like "omw" and expand it to full text instantly as you type. Works offline in any app — no AI, no credits used.
Crypto Payments
Pay with USDT via Cryptomus. Get 30% more energy credits when you pay with crypto.
App Gallery
See it in action
Reply to any chat without leaving the conversation.
Pick a Prompt
Generating Reply
Instant Answer
Why Choose Synapse Keyboard?
Other keyboards give you grammar check. Synapse gives you a full AI assistant. Ask it to write emails, translate conversations, generate code, draft proposals — whatever you need, right where you type.
Full AI — No Limits
Most keyboards give you grammar check. Synapse gives you a full AI assistant — ask it anything and get the answer directly in your keyboard, inside any app.
Compare with competitors →Custom AI Prompts
Create, save, and reuse custom prompts. Pitching clients or sending updates? Type your prompt keyword and expand it to complete text inside any app.
Great for freelancers →Pay-as-You-Go Credits
No subscription trap. Buy credit packs starting at $5 and spend only when executing AI operations. Basic typing features remain free forever.
See all features →Privacy-First Input
Your keystrokes stay completely private. AI requests are processed on-demand without logging messages. Your personal details are safe.
AI grammar checker →Works seamlessly in WhatsApp, Gmail, Instagram, Slack, and any app you type in.
Your prompt, your use case
Select your text, tap a prompt — Synapse runs AI and replaces it instantly. Here are real ways people use it every day.
Reply to Upwork & Fiverr clients
Paste the client's message, tap one prompt — Synapse writes a professional, friendly reply in their language. No more staring at a blank chat.
Write professional emails
Tell the AI what you need to say, tap the prompt — get a polished, professional email ready to send from Gmail, Outlook, or any mail app.
Answer letters & emails
A long email lands in your inbox. Copy it, tap the prompt — Synapse reads it and writes a clear, formal reply that covers every point. Short and polished.
Join Reddit conversations
Type the topic, tap the prompt — get a thoughtful, natural-sounding comment that adds value. Friendly and conversational, never robotic.
Translate to any language
Write “Translate to French”, “Translate to German”, or any language you need. The AI handles the rest — meaning and tone kept intact.
Write proposals & pitches
Describe your offer or skills, tap the prompt — get a confident proposal ready for LinkedIn, Upwork, or any job platform. Save it, reuse it every time.
Whatever your prompt is, that becomes the use case for you. Try it free
Up and running in 4 steps
Less than 2 minutes from download to your first AI response.
Download & install
Grab the APK from the Download section and install it. Enable 'Unknown sources' if prompted — this is normal for APKs outside the Play Store.
Enable Synapse keyboard
Open the app, tap 'Enable Synapse Keyboard', toggle it on in system settings, then set it as your default input method. Done in under 60 seconds.
Type your prompt
Open any app — WhatsApp, Gmail, Reddit. Select text or tap the AI button, then type your prompt: "Reply professionally" or "Translate to Urdu".
Paste and send
AI generates the answer in 4 seconds. Paste it and send. That's it — no app switching, no copy-pasting to ChatGPT, every time.
Simple, one-time energy credits
Pay once, use forever. Pay with crypto and get 30% more credits on every package.
Mini
- Instant activation
- Syncs to mobile app
- No expiration
Starter
- Instant activation
- Syncs to mobile app
- No expiration
Growth
- Instant activation
- Syncs to mobile app
- No expiration
Scale
- Instant activation
- Syncs to mobile app
- No expiration
Max
- Instant activation
- Syncs to mobile app
- No expiration
Powered by Cryptomus — USDT payment supported.
Energy credits are non-refundable — start with $5 and top up only if it works for you. Know before you buy →
Common questions
Everything you need to know about Synapse AI Keyboard.
Real reviews from real users
Ready to upgrade your typing?
Download the Synapse AI Keyboard APK and start using AI in every app within minutes. Free to install, 20,000 credits included.
- Free APK — no payment required to install
- 20,000 energy credits on first signup
- Works on Android 8.0 and above
- Multi-language support: English, Urdu, Arabic & Spanish
20K
Free credits
Safe
Verified APK
8.0+
Min Android
~32 MB
Download size
Safe to install
Google Play Protect still scans the app on your device when you install it. You'll just see a one-time “allow from this source” prompt — tap Allow, then Install. That's the only extra step versus the Play Store.