Our engine is fully open-source, and you choose how to deploy models: use our CC-BY-SA licensed community models or upgrade to commercial models with premium performance. We focus on building fast, high-quality production models and providing examples that take the guesswork out of integration.

• ⚡ Fast & lightweight – optimized Zipformer models (Whisper and parakeet style coming).
• 🧩 Flexible licensing – use fully open-source CC-BY-SA community models or integrate commercial/OEM models for premium accuracy.
• 🌍 Runs anywhere – cross-platform and with support for many programming languages.
• 📱 Mobile & web ready – works on Android, (iOS coming soon) in the browser via WASM, and with WebSockets for streaming.
• 🧰 Production focus – we prioritize real-world performance, stability, and examples.
• 🤝 Customizable – bring your own model, fine-tune for domain-specific vocabularies, or commission us.

Our mission: fast, high-quality ASR with licensing that works for both open-source and closed-source projects.

Run speech recognition natively on your phone using ONNX Runtime.

• Kroko ASR Model Explorer

Experience transcription directly in your browser, no server required.

• Hugging Face Spaces Demo

Kroko ASR follows a unique dual-model strategy:

• Licensed under CC-BY-SA.
• Low-latency, lightweight models.
• Perfect for hobby projects, research, or free tiers.
• Faster and smaller than Whisper/Parakeet in many scenarios.

• Premium accuracy and robustness.
• Licensed for professional and production products.
• Designed for SaaS, dev tools, and enterprise integration.

• DIY: Use our training guides to build and distribute your own models.
• Professional services: Work with us to create fine-tuned models for accents, jargon, or specialized domains.

This gives you full freedom: start free, scale commercially, or roll your own.

Join the Kroko community to learn, share, and contribute:

• 💬 Discord – chat with developers, ask questions, and share projects.
• 📢 Reddit – join discussions, showcase your integrations, and follow updates.
• 🤗 Hugging Face – explore our models, try live demos, and contribute feedback.

PRs welcome! Run ruff, black, and pytest before submitting.

Apache-2.0 engine. Models licensed separately (CC-BY-SA community or commercial OEM).

Kroko ASR is built on top of Sherpa-ONNX.

⚠️ Note: Kroko ASR is an independent project and is not affiliated with Sherpa-ONNX. We build on their excellent open-source engine, but our models, demos, and packaging are developed and maintained separately.