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CapyBro

CapyBro — Lightweight Windows tray utility to polish, translate, and rewrite any selected text via hotkeys. OpenRouter cloud or local Ollama. Open-source.

About CapyBro

CapyBro is a fast, native Windows productivity tool that seamlessly integrates Artificial Intelligence into your daily workflow. Unlike browser extensions, CapyBro works globally across your entire OS — whether you are typing an email in Outlook, writing code in VS Code, or chatting in Telegram.

Key features include:

- Global Integration: Process any highlighted text via system-wide hotkeys. Defaults: Ctrl+Shift+E (improve), Ctrl+Shift+Q (prompt menu), Ctrl+Shift+Z (undo last replacement).

- Model Flexibility: Connect to leading cloud models (GPT, Claude, Gemini, and dozens more) in one place via OpenRouter, or run completely offline using Ollama.

- Custom Prompts: Create tailored commands (e.g., "Fix Grammar," "Change to Professional Tone," "Summarize") with optional dedicated hotkeys.

- Privacy First: API keys are encrypted via Windows Credential Manager (DPAPI). History stays on your machine. Using Ollama guarantees no data ever leaves your device.

- Native Performance: Built with .NET 8 + WPF + Win32 P/Invoke. 49 MB installer, ~80 MB RAM at idle — five times lighter than typical Electron alternatives.

- Open Source: Released under the MIT license, with the full codebase available on GitHub for inspection and contribution.

Free version is feature-complete for everyday use. Pro ($19 one-time, never subscription) adds usage statistics, history export to CSV/JSON, switch-model hotkey, and premium prompt packs.

The solution
Rewrites, corrects or translates selected text in Windows applications using a keyboard shortcut.

Details

Use cases
  • Rewrite selected text without leaving an application
  • Translate text in place using a hotkey

CapyBro homepage

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Website performance

Recorded mobile lab measurements and finalized weekly standings from IndieTools Speed.

93ExcellentMobile Lighthouse

Measured · UTC

Load time
399 ms
FCP
937 ms
LCP
3.23 s
CLS
0.000
TTFB
3 ms
TBT
3 ms
Speed index
2.92 s

These stored lab observations describe controlled test runs. They are not real-user Core Web Vitals or a guarantee of search rankings. Weekly standings below remain attached to their finalized edition.

Overall rank
Not finalized
Best overall rank
Not finalized
0 top 10 finishes
Best category rank
Not finalized
0 category wins
Latest change
+1 score
No finalized score yet

Method: psi-mobile-two-sample-mean-v1 · 2 samples per reading. Only readings with the same recorded method and sample count share a chart. Lab results can vary between runs.

Website performance history

Inspect every successful mobile Lighthouse lab measurement by metric and date range.

Range

Latest score

93 / 100

Higher is better
35 measurements

Use the left and right arrow keys to inspect measurements. Use Home or End to jump to the first or last measurement. Press Escape to dismiss the chart tooltip.

Oct 8, 2026Nov 7, 2026
DR4 (primary model)
0

First DR4 reading

DR3
2

No change since 6 Nov

Model difference−2. DR4 is 2 points lower than DR3.

Measured · capybro.app

What do DR4, DR3 and the model difference mean?
DR4:
Ahrefs' newer model. It gives more weight to links from sites with organic search traffic and rates a subdomain on its own links.
DR3:
The previous model, shown in the Ahrefs app until 1 December 2026.
Model difference:
DR4 minus DR3 for the same domain. The models calculate differently, so this is not growth or a drop; the “since” lines compare each model with itself.

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