I Built an AI That Auto-Replies to Your Instagram DMs (No Login Required)

A developer built InstaReply Bot, an open-source Android app that automatically replies to Instagram DMs using AI without requiring login credentials. The app leverages Android's Notification Listener API to read incoming messages and uses the notification's Reply action to send AI-generated responses, supporting free AI providers like Groq, OpenCode Zen, and Google Gemini. The developer highlighted the technical architecture, including a one-reply guarantee to prevent duplicate responses.

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.