Coreply is an open-source Android app providing texting suggestions while you type. It enhances your typing experience with intelligent, context-aware suggestions.

WhatsApp
Instagram
Tinder
Signal
Notification Replies1,2
Hinge
LINE
Heymandi
Gmail3
Telegram4
Mattermost2
Facebook Messenger1
Google Messages1
Snapchat2
Microsoft Teams
Viber

¹ Performance issues: Coreply may not follow smoothly the animations and transitions.
² Limited role detection: Coreply cannot detect whether the message is sent or received.
³ In Gmail, Coreply only works on the quick reply text field at the bottom of the email.
⁴ Including Direct Download version, Play Store version, and Nekogram.

DISCLAIMER: Coreply is not affiliated with or endorsed by the above-mentioned apps or their parent companies.

• Real-time AI Suggestions: Get accurate, context-aware suggestions as you type.
• Customizable LLM Settings: Supports any inference service having an OpenAI compatible API.
• No Data Collection: All traffic goes directly to the inference API. No data passes through intermediate servers (except for the hosted version).

• Android 8 or higher (Android 13 or higher recommended)
• API Key for OpenAI or an OpenAI-compatible inference API.

1. Install the latest APK from the releases page
2. Configure the app with your API key, URL and model name (see the section below).
3. Toggle on the switch and grant necessary permissions. If you encountered the "Restricted settings" dialog, you can follow these steps.
4. Start typing in your messaging app, and see suggestions appear!
   • Single tap on the suggestion to insert one word
   • Long press to insert the entire suggestion.

API URL: https://api.openai.com/v1/

API Key: Grab it here

Model Name: gpt-4.1, gpt-4.1-mini, gpt-4.1-nano, gpt-4o, or gpt-4o-mini.

gpt-5 family not recommended as they are reasoning models; mini variants are recommended for the best cost-performance ratio.

API URL: https://generativelanguage.googleapis.com/v1beta/openai/

API Key: Grab it here

Model Name: gemini-2.0-flash, gemini-2.0-flash-lite, or gemini-2.5-flash-lite.

gemini-2.5-flash in AI Studio reasons by default. Therefore not recommended. gemma-3 family in AI Studio doesn't support system instructions. Thus not compatible.

API URL: https://openrouter.ai/api/v1/

API Key: Grab it here

Model Name: google/gemini-2.5-flash, google/gemini-2.5-flash-lite, google/gemini-2.0-flash-001, google/gemini-2.0-flash-lite-001, openai/gpt-4.1-mini, openai/gpt-4.1, mistralai/codestral-2508, or openai/gpt-oss-20b.

API URL: https://api.groq.com/openai/v1/

API Key: Grab it here

Model Name: openai/gpt-oss-20b, llama-3.1-8b-instant, or llama-3.3-70b-versatile.

API URL: https://api.mistral.ai/v1/fim/

API Key: Grab it here

Model Name: codestral-latest

Theoretically any OpenAI-compatible endpoint can be used. Find the API URL, API Key, and Model Name in the docs of the provider. The default system prompt works with mainstream models, but you can improve it if needed.

Personal note: I like Gemini

Note: Models listed here are just examples. You are welcome to experiment with those not listed. Although smaller models (<7B) tend to fail outputting in the desired format.

1. Clone the repository:
2. Open the project in Android Studio.
3. Sync the Gradle files and resolve any dependencies.
4. Build and run the app on your preferred device or emulator.

See Model Selection & Providers for details.

See Model Selection & Providers for details.

All contributions are welcome. However, please expect breaking changes as this project is in active development. A contributor license agreement (CLA), or change in license is under consideration. Feel free to reach out before making significant contributions.

• The app cannot read images, videos, voice notes, or other non-text content. Contextual suggestions may be limited in these cases.
• Hint text 'Message' in WhatsApp is treated as typed text on devices running Android 12 or lower.
• RTL support is limited.
• Banking apps in asia commonly block apps from unknown sources having accessibility services permission due to security reasons. If you are facing this issue, you can setup an accessibility shortcut to toggle the coreply on/off quickly. In the future there might be a Play Store listing to avoid this issue.

Coreply

Copyright (C) 2024 Coreply

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see http://www.gnu.org/licenses/.