AstralNotes

AstralNotes is a modern, high-performance note-taking and personal knowledge app built with Jetpack Compose, Material 3 Expressive design, local Room database persistence, Google Gemini AI intelligence, and optional Firebase Cloud Sync.

Features

- Material 3 Expressive Design — Fluid adaptive layouts, custom pastel note tints, contrast-optimized dark and light modes, and Google Keep-style ease of use. - Full Markdown Editor — Live interactive checklists, code blocks with 1-tap copy, headers, bold, italic, strikethrough, highlights, and automatic list continuations. - Biometric Private Vault — Secure confidential and sensitive notes behind biometric fingerprint or custom alphanumeric PIN. - User-Provided Gemini AI Intelligence — Instant note summarization, action item extraction, creative brainstorming, and interactive conversational chat across your entire knowledge base. - Offline-First Persistence — All notes persist instantly in a local AndroidX Room SQLite database with zero internet connection required. - Cloud Sync with Firestore — Real-time bidirectional note synchronization when signed in with Google. - Tags & Organization — Flexible tag filters, pinned notes, archive storage, and trash recovery. - Multi-Format Export — Export notes to Markdown (.md), Plain Text (.txt), HTML (.html), or JSON backup. - Home Screen Quick Note Widget — Capture quick thoughts, checklists, images, and launch AI assistance directly from your Android home screen.

Getting Started

1. Download and Install the App

1. Download the latest APK. 2. Install the .apk file on your Android device (Android 8.0 / API 24 or higher). 3. Open AstralNotes.

2. Configure Your Gemini AI Key

AstralNotes operates with 100% user-owned API keys. No developer or server-side API key is bundled or required.

1. Obtain a free API key from Google AI Studio. 2. In AstralNotes, open the navigation drawer and tap Settings (or tap the Sparkle icon on any note). 3. Under Google Gemini Intelligence, paste your key into Custom Gemini API Key. 4. (Optional) Select your preferred model (such as gemini-3.7-flash, gemini-3.5-flash, or enable High Thinking Mode). 5. Tap Save Gemini Config.

Note: Your API key is stored securely on your local device in private encrypted app storage and is never uploaded or shared.

3. Enable Cloud Sync (Optional)

Offline-First Mode (Default):

- You can use AstralNotes entirely offline without creating an account. All notes persist in your local SQLite Room database.

Cloud Sync Mode:

1. Open Settings > Cloud Sync & Firebase Auth. 2. Tap Sign In with Google. 3. Your notes will automatically sync bidirectionally with your private Cloud Firestore database across your devices.

4. Quick Tips

- Checklists: Type - [ ] to start an interactive checklist. Tapping Enter on a checked or unchecked item automatically continues the list. - Code Blocks: Wrap code in triple backticks with a language name (e.g. ```kotlin) to get syntax-styled code cards with 1-tap copy. - Locking Notes: Tap the 3-dot menu on any note and select Lock Note to move it into your Biometric Vault. - AI Chat: Tap the Sparkle icon on any note to summarize, polish, or ask questions about that specific note or your entire library.

Security & Privacy

- Local Storage: All notes are saved locally on your device in an isolated Room SQLite database. - Vault Protection: Locked notes require your custom PIN or fingerprint biometric authentication to access and are hidden from regular note lists. - Private Cloud Data: When Cloud Sync is active, Firestore security rules ensure that only your authenticated Google account can read and write to users/{userId}/notes. - Zero Third-Party Tracking: No advertising SDKs, trackers, or hidden analytics.