LocalLingo

Local-first translation and spellchecking powered by Ollama. Your text is processed by your own local model and does not require cloud APIs or API keys.

Highlights

• Private by default: inference runs against your configured Ollama instance
• Two focused workflows in one UI: Translate for bilingual translation and Spellcheck for spelling, grammar, and punctuation correction
• Streaming model output for responsive feedback
• Auto-run after typing pause (800 ms debounce), plus manual action buttons
• Model + endpoint settings persisted in localStorage
• Works on desktop and mobile layouts

Requirements

• Node.js 18+
• pnpm
• Ollama installed and running (default: http://localhost:11434)
• At least one local model pulled in Ollama

Example:

ollama pull translategemma:4b
# or mistral / gemma3 / qwen2.5 etc.

Quick Start

git clone https://github.com/svcho/LocalLingo.git
cd LocalLingo
pnpm install
pnpm dev

Open http://localhost:3000.

How To Use

Translate Mode

1. Select source and target languages.
2. Type or paste text in the left pane.
3. Translation streams into the right pane automatically after a short pause.
4. Optional controls: Translate to run immediately, Swap to swap languages and reuse output, and Copy to copy translated text.

Spellcheck Mode

1. Switch to Spellcheck.
2. Paste or type text in the input pane.
3. Corrected text appears in the output pane (auto-check + manual Spellcheck button).
4. Optional controls: Replace Input to continue editing from corrected text and Copy to copy corrected text.

Privacy And Safety Notes

• LocalLingo only sends text to your configured Ollama URL.
• If you point to a remote Ollama host, privacy depends on that host/network.
• Model outputs can be wrong or stylistically imperfect. Review important text before use.

Configuration

Click the status pill in the header to open settings:

• Set Ollama URL
• Test connection
• Choose the active model

Supported Translation Languages

English, Spanish, French, German, Italian, Portuguese, Chinese (Simplified), Chinese (Traditional), Japanese, Korean, Russian, Arabic, Hindi, Dutch, Swedish, Polish, Turkish, Vietnamese, Thai, Indonesian.

Build And Run

pnpm build
pnpm start

Tech Stack

• Next.js 16 (App Router)
• React 19 + TypeScript 5
• Tailwind CSS v4
• Ollama local models

Project Structure

app/
  api/ollama/
    tags/route.ts
    generate/route.ts
  layout.tsx
  page.tsx
components/
  Header.tsx
  SettingsModal.tsx
  SpellcheckPane.tsx
  TranslationPane.tsx
  CopyButton.tsx
context/
  SettingsContext.tsx
hooks/
  useOllamaGeneration.ts
  useTranslation.ts
  useSpellcheck.ts

License

MIT