Smart X Reply is an AI-powered reply generator built directly
into X (Twitter). Stop staring at a blank compose box - tap one
button and get a sharp, on-brand reply in seconds.
FEATURES
• ⚡ Instant AI replies using Gemini, Cerebras or Mistral
• 🎭 Set your persona - the AI writes in your voice
• 😊 13 mood tones - Positive, Sarcastic, Helpful, Question and more
• ✨ Improve any reply already in your compose box
• 🔄 Regenerate for a fresh alternative anytime
• 🌐 Auto-detects tweet language and replies to match
• 📋 One-tap copy to clipboard
• 🔑 Bring your own free API key - no subscription needed
HOW IT WORKS
1. Open any tweet on X and tap Reply
2. The Smart X Reply toolbar appears above your keyboard
3. Pick your mood, tap ⚡ Reply
4. AI generates a reply and injects it directly into the compose box
5. Post it
PRIVACY
Your API keys are stored only on your device. No data is sent to
our servers. Replies are generated directly between your phone
and the AI provider you choose.
Get your free Gemini API key at aistudio.google.com - no credit
card required.
Latest Version
1.1Uploaded by
Sunnybest
Requires Android
Android 8.0+
Available on
SunnybestCategory
Free Tools AppReport
Flag as inappropriateLast updated on Aug 11, 2026
v1.1
5 new reply moods added: Casual 😎, Human 🧑, Human & Very Short 🧑⚡, Very Very Short ⚡⚡, Positive & Very Short 😊⚡
All moods now strictly enforced - AI must follow your selected tone, no exceptions
Persona/style prompt now applies on every single reply alongside your chosen mood
App now focused exclusively on X (Twitter)
Selected mood persists across all replies until you change it
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