# Anlingo

> Privacy-first AI grammar checker and writing assistant. Free on-device grammar checks. Pro tier powered by Gemini 1.5 Flash.

Anlingo is a cross-platform AI writing tool that helps users fix grammar, clarity, and tone in seconds. It is available as a web app (Next.js 14), iOS app, and Android app (Flutter). The product is positioned as a privacy-first alternative to Grammarly.

## What makes Anlingo different

- **Privacy-first architecture:** The free tier runs grammar checks entirely on-device. Your text never leaves your browser or phone. No data is uploaded, stored, or used for training.
- **On-device processing:** Free-tier grammar correction uses local ML models — zero cloud cost, zero latency, complete privacy.
- **Cloud AI for Pro users:** The Pro tier uses Gemini 1.5 Flash for deep grammar analysis, Deepgram Nova-2 for voice dictation, and ElevenLabs for natural text-to-speech. Data is encrypted in transit and purged after each request.
- **Cross-platform:** Available on web (app.anlingo.online), iOS (App Store), and Android (Google Play).
- **Freemium model:** Start free with 20 grammar checks per day. Upgrade to Pro for unlimited checks, AI rewrites, voice dictation, and full draft history.

## Core features

- **Grammar checking** — Real-time AI grammar, spelling, and style correction with per-error explanations
- **AI rewrites** — Cloud-powered text rewrites and tone adjustments (Pro)
- **Writing score** — Document health score out of 100 with improvement tracking (Pro)
- **Voice dictation** — Speech-to-text with smart punctuation via Deepgram Nova-2 (Pro)
- **OCR text scanner** — Extract text from images using on-device Google ML Kit (all tiers)
- **Text-to-speech** — Listen to corrected text with ElevenLabs neural voices (Pro) or system voice (Free)
- **Writing modes** — Professional, Casual, Academic, Social Media
- **Draft history** — 10 local items (Free) or unlimited cloud-synced history (Pro)
- **Multi-language support** — English, Vietnamese, Chinese (Simplified)

## Pricing

- **Free:** $0/month forever. 5 checks/day (guest) or 20 checks/day (with free account). On-device processing.
- **Pro:** Available weekly, monthly, and annually (save 20%). Unlimited checks, Gemini 1.5 Flash AI, voice dictation, full history, cloud sync. 30-day money-back guarantee.

## Key pages

- [Homepage](https://anlingo.online/): Product overview, live demo, features, and pricing
- [Web App](https://app.anlingo.online/): The grammar checker editor (start free, no signup needed)
- [Pricing](https://anlingo.online/pricing/): Subscription plans and feature comparison
- [Support](https://anlingo.online/support/): FAQ, help center, and contact information

## Legal & compliance

- [Privacy Policy](https://anlingo.online/privacy/): GDPR and CCPA compliant
- [Terms of Service](https://anlingo.online/terms/)
- [EULA](https://anlingo.online/eula/)
- [Data Processing Agreement](https://anlingo.online/dpa/)
- [Refund & Billing Policy](https://anlingo.online/refund-policy/): 30-day money-back guarantee
- [Delete Your Data](https://anlingo.online/delete-data/): GDPR data erasure request

## Technical stack

- **Web frontend:** Next.js 14 (App Router), React, TailwindCSS
- **Mobile app:** Flutter (Dart), single codebase for iOS and Android
- **Backend:** Express.js, TypeScript, Firebase Admin SDK, Redis
- **AI providers:** Google Gemini 1.5 Flash, Deepgram Nova-2, ElevenLabs
- **Auth:** Firebase Authentication (Google OAuth, email/password)
- **Database:** Firestore (NoSQL), Redis (caching), Postgres (archive)
- **Payments:** Stripe, Whop, MoMo (Vietnam), RevenueCat (mobile IAP)

## Contact

- Support email: support@anlingo.online
- Privacy inquiries: privacy@anlingo.online
- Legal inquiries: legal@anlingo.online