Published models: free for commercial use. Custom models: built for you.
VoxRT is freemium: everything published in our GitHub org is free to use — including in commercial production apps — with no per-user, per-device, or per-detection fees. Custom models tuned to your product are a paid engagement.
What's free, what's a paid engagement
Free, today, for commercial production use: the wake-word SDKs with the reference "Hey Assistant" model (iOS, Android, Linux, browser), the Silero-v5 VAD SDKs (iOS, Android), and the streaming ASR SDKs (iOS, Android, English). No license key, no account, no usage metering — install from Swift Package Manager, JitPack, PyPI or npm and ship.
Paid engagements: models built for your product — a custom wake phrase ("Hey YourBrand"), a keyword-spotting vocabulary, a speech-to-intent model on your intents, additional languages, and OEM or bulk-device deployments. Tell us what you're building via the Try VoxRT form and we'll scope it.
Three layers, one simple rule
Every VoxRT SDK has the same three-layer structure. The rule: if it's published, it's free to use commercially.
| Layer | What it is | License |
|---|---|---|
| SDK wrappers | The source you integrate — Swift, Kotlin, Python, Node.js, Go, C/C++ headers and examples. | Apache-2.0 |
| Runtime | The compiled VoxRT inference runtime (xcframework / .so / .wasm). Proprietary, redistributable as part of the unmodified SDK. | Free for commercial use no per-user fees |
| Model weights | Varies by product: reference wake word (VoxRT in-house, free to ship with the SDK), Silero VAD v5 (MIT), ASR FastConformer (CC-BY-4.0, NVIDIA attribution). | Per product |
Licensing, answered
Are VoxRT published models free for commercial use?
Yes. The published SDKs are free to use in commercial production apps: the SDK wrapper source is open under Apache-2.0, and the compiled VoxRT runtime is free for commercial use with no per-user, per-device, or per-detection fees. When you need more, custom models — wake phrases, keyword vocabularies, speech-to-intent, additional languages — are paid engagements.
What do I pay for?
Custom models: wake phrases, keyword vocabularies, speech-to-intent models, additional languages, and OEM or bulk-device deployments. Everything published in the VoxRT GitHub org is free to use, including commercially.
What licenses cover the model weights?
It varies by product: the reference wake-word model is VoxRT's own proprietary model (free to ship with the unmodified SDK, no per-installation fees), the Silero VAD v5 weights are MIT, and the ASR weights are CC-BY-4.0 — derived from NVIDIA NeMo, attribution required.
Do I need a license key or account to ship?
No. The SDKs are distributed publicly (Swift Package Manager, JitPack/Gradle, PyPI, npm) and the models via GitHub Releases. There is no per-user metering, license server, or usage reporting.