# CapyBro

> AI-powered text rewriter for Windows. Select text in any program, press a hotkey, get AI-rewritten result back in place. OpenRouter cloud or fully-local Ollama mode. Privacy-first, no telemetry.

CapyBro is a Windows 10/11 tray utility that bridges global hotkeys with AI text rewriting. It runs natively on .NET 8 / WPF — no browser, no Electron, no background telemetry. The default hotkey `Ctrl+Shift+E` improves the currently-selected text in any application that supports copy/paste: Word, Chrome, VS Code, Slack, Notepad, email clients, IDEs, anything.

Two LLM backends are supported, switchable from Settings → Provider with a single checkbox:

- **OpenRouter** (cloud, default) — pay-as-you-go access to GPT-4o, Claude, Gemini, Llama, DeepSeek, Mistral and dozens more through a single API key.
- **Ollama** (local) — fully on-device inference. Text never leaves your computer. Run `ollama serve`, `ollama pull gemma3` (or any other model), enable Ollama in Settings. Auto-reverts to OpenRouter if `ollama serve` becomes unreachable.

## Documentation

- [Documentation in English](https://capybro.app/en/docs/): Full user manual covering installation, hotkeys, custom prompts, two-provider setup, privacy model, FAQ.
- [Українська документація](https://capybro.app/uk/docs/): Same content in Ukrainian.
- [Русская документация](https://capybro.app/ru/docs/): Same content in Russian.

## Quick facts

- **Platform**: Windows 10 (build 1809+) / Windows 11, x64. No macOS or Linux port (Win32-API dependencies).
- **Stack**: .NET 8, WPF, Win32 P/Invoke for global hotkeys.
- **Pricing**: Free (open-source core, MIT-licensed) and Pro $9 one-time payment via Gumroad.
- **UI languages**: English, Ukrainian, Russian. Switchable instantly; AI responses support far more languages.
- **Default hotkeys**: Ctrl+Shift+E (improve), Ctrl+Shift+Q (prompt menu), Ctrl+Shift+Z (undo). Pro adds Ctrl+Shift+M (cycle pinned models).
- **Installer**: ~48 MB single-file `.exe`, per-user install (no admin rights), no autostart by default.
- **Privacy**: Zero telemetry, no analytics, no crash reporting. API key encrypted via Windows DPAPI in Credential Manager. Optional PII redaction masks emails/phones/cards before sending to LLM.

## Pricing & licensing

- **Free version** — base product, MIT-licensed source code at [github.com/phantasmat2018/capy-bro](https://github.com/phantasmat2018/capy-bro). Everything described above works in the free tier.
- **Pro version $9** — one-time payment, 1 device per license, all future updates free. 14-day money-back guarantee. Buy at [capybro.app/#pricing](https://capybro.app/#pricing).

## Pro-only features (6 extras)

- **Statistics dashboard** — total improvements, character count, spend tracking, per-model breakdown, 30-day activity chart.
- **History export** — CSV or JSON export of the last 50 improvements.
- **Settings backup & restore** — portable JSON snapshot of prompts/models/hotkeys/feature-flags. API key and license stay machine-local.
- **Switch-model hotkey** (Ctrl+Shift+M) — cycle through 2–3 pinned models without opening Settings. Works mid-request.
- **Premium prompt packs** — 5 curated bundles (Legal, Marketing, Academic, Code Review, Business correspondence), ~10 prompts each.
- **One-off custom prompt box** — in the prompt menu (Ctrl+Shift+Q), type a one-time instruction and apply it to the selection without saving a preset.

## Common scenarios CapyBro is built for

- Fix grammar / typos / awkward phrasing in any text field
- Translate selected text between supported languages
- Reformulate informal text into formal (or vice versa)
- Shorten a long paragraph to a specific word count
- Explain a technical sentence in simpler terms
- Generate variations of marketing copy
- Code review of a selected snippet
- Convert structured notes into prose (or prose into bullets)

## Author & contact

Single developer: Roman Tykhonenko. Based in Ukraine. Support email: support@capybro.app. Bug reports / feature requests: [GitHub Issues](https://github.com/phantasmat2018/capy-bro/issues) or the [feedback form](https://capybro.app/en/feedback/) at capybro.app.

## See also

- [Full documentation in markdown form for LLM grounding](https://capybro.app/llms-full.txt)
- [Source code (Free core, MIT)](https://github.com/phantasmat2018/capy-bro)
- [Latest release on GitHub](https://github.com/phantasmat2018/capy-bro/releases)
- [Direct installer download](https://github.com/phantasmat2018/capy-bro/releases/download/v2.0.2/CapyBro-Setup-2.0.2.exe)
- [Privacy policy](https://capybro.app/en/privacy/) · [Terms of service](https://capybro.app/en/terms/)