Notepad AI: Offline Editor

Notepad AI is an offline polyglot code editor, technical document workstation, and local AI studio powered by the on-device Qwen3 0.6B engine. Built for software engineers, database architects, and technical writers, it brings static analysis, code transpilation, and document inspection to your phone.

No cloud API keys. Your code stays on your device.
Unlike cloud wrappers that upload source code to remote servers, Notepad AI runs its AI inside your device sandbox. Download the open-source Qwen/Qwen3-0.6B-GGUF model pack once from HuggingFace and run every AI workflow in airplane mode. Your files and prompts are never sent to our servers. (The free version shows ads; ad and purchase services may use the device advertising ID.)

9 BUILT-IN OFFLINE AI & ENGINEERING TOOLS:

1. AI Code Explainer & Complexity Analyzer:
Break down algorithms line by line with Big-O time/space estimates (O(N), O(N log N)) and cyclomatic branch scoring.

2. AI Bug & Security Scanner:
Detect SQL injection (CWE-89), XSS (CWE-79), race conditions, and null-dereference hazards with 1-tap patch suggestions.

3. Polyglot Code Transpiler:
Convert PHP 8.3 classes into null-safe Dart 3 / Flutter models, JavaScript into strict TypeScript interfaces, or Python logic into Go and Rust.

4. Unit Test Generator:
Create unit test scaffolds with boundary and negative assertions for PHPUnit, Jest/Vitest, PyTest, and Flutter Test.

5. SQL Query Optimizer & Index Advisor:
Rewrite slow full-table scans into SARGable range queries and suggest composite indexes for PostgreSQL, MySQL, and SQLite.

6. PCRE2 Regex Studio & Live Match Inspector:
Generate regular expressions from plain-English prompts and inspect named capture groups in real time.

7. JSON & YAML Schema Inspector + DTO Builder:
Repair malformed JSON, browse deep object trees, infer JSON Schemas, and generate data classes.

8. Two-File Diff Comparator & Patch Merger:
Compare File A and File B, see similarity percentage and added (+), removed (-) and modified (~) lines, and export standard Unified .diff patches.

9. Document Summarizer (PDF, DOCX, Markdown):
Turn multi-page specs, DOCX documents, and Markdown notes into short briefs and action items.

POLYGLOT FILE & DOCUMENT WORKSTATION:
• Multi-tab code editor: syntax highlighting, line numbers, symbol bar, and live split Markdown preview for .php, .dart, .js, .ts, .py, .sql, .json, .yaml, and .md.
• PDF & DOCX vault: preview PDF pages, extract Word (.docx) text, and export any buffer to PDF, DOCX, Markdown, or JSON in one tap.

NOTEPAD AI PRO (OPTIONAL SUBSCRIPTION):
Remove ads and unlock the full workstation with a weekly, monthly, or yearly plan. Subscriptions renew automatically until cancelled in Google Play. Manage or cancel anytime in Play Store > Payments & subscriptions > Subscriptions.

BUILT FOR MODERN ANDROID:
• Foreground-only: no background services, no wake locks, no battery drain when closed.
• Android 15/16 16 KB page size support for next-generation arm64 devices.