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CapyBro, developed by Roman Tykhonenko, is an AI-powered text rewriting utility for Windows designed to bring language model capabilities to any text on the desktop through a single global hotkey. The current release is version 2.0.2, with two versions published to date. The application runs as a lightweight tray utility: users select text in any program — such as Word, Telegram, Outlook, a browser, or a code editor — and press Ctrl+Shift+E to have the selected content rewritten in place by AI. Its purpose spans several practical use cases, including grammar correction, translation between languages, paraphrasing, tone formalization, and execution of user-defined custom prompts, making it suitable for writing, communication, and editing workflows across applications. CapyBro falls into the category of AI writing assistants and desktop productivity utilities. It supports two AI operation modes: a cloud-based mode using OpenRouter, where a single API key provides access to GPT, Claude, Gemini, DeepSeek, and dozens of other models, and a fully local mode via Ollama, in which text never leaves the user's computer — an option relevant for privacy-sensitive environments. The core application is open-source under the MIT license, while an optional Pro tier, available as a one-time payment, unlocks additional features such as usage statistics, settings backup, history export, a model-switch hotkey, and curated prompt packs. Technically, CapyBro is built as a native .NET 8 WPF application, avoiding Electron in favor of a lightweight implementation. The software is localized in English, Ukrainian, and Russian. By combining system-wide hotkey integration, flexible model selection across cloud and local backends, and an open-source foundation with a paid feature tier, CapyBro positions itself as a versatile text-processing companion for Windows users who frequently rewrite, translate, or refine text across multiple applications.
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