A native Android toolkit for Instagram creators — hashtag research, on-device AI captioning, and content tools, built with a strong focus on privacy and platform-policy compliance.
HashKit is a full native Android app (no Flutter/React Native) with 8 independent tools aimed at Instagram creators — hashtag generation, on-device photo analysis, caption/bio writing, and a link-based reel downloader. It's live on the Play Store with zero ads, zero login, and zero personal data collection.
| Tool | What it does |
|---|---|
| 🏷️ Hashtag Search | Keyword → Easy / Medium / Hard hashtags with real post-count difficulty, plus a Smart Select mixer |
| 🔑 Keyword Hashtags | Keyword → 30 ready-to-use hashtags instantly |
| 📸 Photo AI Generator | On-device ML Kit image labeling suggests a caption + hashtags for any photo — the photo never leaves the device |
| ✍️ Caption Writer | 100+ curated captions across niches |
| 👤 Bio Generator | 5 bio templates per niche |
| 🔢 Character Counter | Validate caption/bio length against Instagram's limits |
| 🔥 Trending Tags | Browse trending hashtags by category (fully offline) |
| 🎬 Reels Downloader | Paste a public Instagram Reel/post link, save it locally |
- Language: Java
- UI: Native Android Views + Material Components,
ConstraintLayout - ML: Google ML Kit — Image Labeling (on-device, offline)
- Media selection: Android Photo Picker (
ActivityResultContracts.PickVisualMedia) — no storage permissions requested - Networking: plain
HttpURLConnection+ a public link-resolving API for the Reels Downloader - Build: Gradle (AGP 8.9), R8 minification + resource shrinking on release builds
Two decisions worth calling out, since they shaped real product tradeoffs:
- No broad media permissions. Early builds requested
READ_MEDIA_IMAGESfor the photo picker. Since the app only ever needs a single user-selected photo, it was migrated to the Android Photo Picker API, which needs zero runtime permissions and satisfies Google Play's Photos & Videos Permissions policy — this is also exactly what got a previous submission rejection resolved. - Removed a credential-harvesting pattern. The Reels Downloader originally asked users to log in to their real Instagram account inside an in-app WebView, capturing the session cookie to fetch content. That's a real security anti-pattern (and an Instagram ToS violation) regardless of intent, so it was replaced with a public-link-only flow (a public link-resolving API + a direct public-page fetch) — no login, no session data, same feature, none of the risk.
git clone https://github.com/mukeshkumar356/hashkit-android.git
cd hashkit-android
cp keystore.properties.example keystore.properties # fill in your own signing details (optional, debug builds work without it)
./gradlew assembleDebugRelease signing is intentionally kept out of the repo — see keystore.properties.example.
MIT — see LICENSE.
Built and maintained by Mukesh Kumar