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.
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 |
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.
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.