# I Built an AI That Auto-Replies to Your Instagram DMs (No Login Required) > Source: > Published: 2026-08-22 20:40:11+00:00 # I Built an AI That Auto-Replies to Your Instagram DMs (No Login Required) Managing Instagram DMs is a full-time job. Whether you are a small business owner, a content creator, or just someone who gets too many messages, you have probably missed important replies because you could not keep up. So I built **InstaReply Bot**: an open-source Android app that watches your Instagram notifications and replies with AI-generated messages. Automatically. In the background. **Without your Instagram password.** Here is how it works, why I built it, and what I learned. ## The Problem Instagram does not have an official API for sending DMs to personal accounts. Most automation tools either: - **Require your login credentials** (security risk) - **Use fragile web scraping** (breaks when Instagram updates) - **Need the screen on** (not practical for background automation) I wanted something different: a solution that works entirely through Android notification system, with zero credential sharing. ## The Solution: Notification Listener + AI InstaReply Bot uses Android **Notification Listener API** to read incoming Instagram DM notifications. When a new message arrives, the app: - **Extracts** the sender name and message text from the notification - **Matches** the message against user-defined rules (keyword patterns, regex, specific contacts) - **Generates** a reply using an AI provider (Groq, Gemini, OpenRouter, or any OpenAI-compatible API) - **Sends** the reply through Instagram own notification Reply action, exactly like tapping Reply in your notification shade, but automated The key insight: Instagram notification already includes a Reply action. InstaReply Bot just automates clicking that button. ## Why No Login Is Needed Most Instagram bots need your username and password. That is a dealbreaker for me because: - **Security risk**: Credentials stored on someone else server - **Account ban**: Instagram actively detects and bans automation accounts - **Privacy**: I do not want to trust anyone with my Instagram session ## InstaReply Bot never touches your Instagram credentials. It works with Android notification system, a system-level API that Google designed for exactly this kind of use case. ## ## Free AI Models Included I did not want cost to be a barrier, so InstaReply Bot supports **free AI providers**: ### Groq (Free Tier) - openai/gpt-oss-20b: Fast, great for quick replies - llama-3.3-70b-versatile: Better conversational quality - qwen/qwen3.6-27b: Multilingual support ### OpenCode Zen (Free Tier) - opencode/deepseek-v4-flash-free: Lightweight, fast - opencode/mimo-v2.5-free: Context-aware responses ### Google Gemini (Free Tier Available) - gemini-3.6-flash: Google latest No credit card required for any of these. You can also use paid providers like OpenRouter, NVIDIA, or OpenAI if you want more power. ## Technical Architecture The app is built with Kotlin and follows modern Android development practices: Key decisions: - **Room Database** for local storage: rules, contacts, and reply logs stay on your device - **OkHttp** for API calls: lightweight and reliable - **Material Design**: native Android look and feel - **Kotlin Coroutines**: efficient background processing ## The One-Reply Guarantee One of the hardest problems was ensuring **exactly one reply per message**. Instagram sometimes re-posts notifications while the AI is still generating, which could cause duplicate replies. InstaReply Bot solves this with three layers: - **60-second deduplication**: Same sender + message text within 60 seconds is ignored - **Persisted log check**: Successful replies are stored for 10 minutes (survives app restarts) - **Send discipline**: The AI text is typed once, Send is clicked at most once ## What I Learned ### 1. Notification APIs Are Powerful Android Notification Listener API is underutilized. It is a legitimate system API that can transform how apps interact with notifications, no hacking required. ### 2. Free AI Is Real Groq and OpenCode Zen offer genuinely useful free tiers. For a personal auto-reply bot, free models work perfectly. ### 3. Deduplication Is Hard What seems simple: reply to each message once, is actually complex when notifications can arrive multiple times and the AI takes a few seconds to respond. ### 4. Users Care About Privacy Every person I showed this to asked: Does it need my password? When I say no, the reaction is always relief. Privacy-first design matters. ## Try It The app is open source and available on GitHub: [github.com/nandandas2407-web/InstaReplyBot](https://github.com/nandandas2407-web/InstaReplyBot) - Download the APK from Releases: [https://github.com/nandandas2407-web/InstaReplyBot/releases/latest](https://github.com/nandandas2407-web/InstaReplyBot/releases/latest) - Grant Notification Access - Configure a free AI provider (Groq takes 2 minutes) - Create your reply rules ## What Is Next - Support for Instagram Story mentions - Multi-language reply templates - Webhook integration for business workflows - iOS support (if there is interest) ## Open to Contributions This is a side project, but I am open to contributions. If you want to help: - Check the issue tracker for open issues - Read the contributing guidelines - Submit a PR: I review within 24 hours Built with Kotlin for Android. Free AI models included. No Instagram login required.