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source_path: "reference/index.md"
canonical_url: "https://doc.sensory.com/tnl/7.8/reference/"
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# Reference

This section covers the TrulyNatural SDK product — SDK variants and
supported platforms, command-line tools, the supplied models and model
types, licensing, and the changelog. For the programming interfaces, see
the [API reference](https://doc.sensory.com/tnl/7.8/api/index.md#api-reference).

[Overview](https://doc.sensory.com/tnl/7.8/reference/overview.md#ref-overview)

- **Start here.** SDK variants, development host requirements, supported target platforms, models, tools, and license keys.

[Command-line tools](https://doc.sensory.com/tnl/7.8/tools/index.md#command-line-tools)

- Utilities for running and constructing models.

[Models](https://doc.sensory.com/tnl/7.8/models/index.md#models)

- Sample models included in this distribution.

[Model types](https://doc.sensory.com/tnl/7.8/models/types/index.md#model-types)

- Descriptions of various model types and their behaviors.

[Licenses](https://doc.sensory.com/tnl/7.8/licenses/index.md#sensory-sdk-license)

- Sensory and third-party legal agreements.

[Changelog](https://doc.sensory.com/tnl/7.8/changes/index.md#v7-changes)

- Changes by TrulyNatural SDK version.

[How to upgrade](https://doc.sensory.com/tnl/7.8/upgrade.md#how-to-upgrade)

- Change to a different SDK type or upgrade to a newer version.

[VoiceHub](https://doc.sensory.com/tnl/7.8/reference/voicehub.md#voicehub)

- Guide to selecting the appropriate format for models created with
  [Sensory's VoiceHub portal][vh].

[Contact information](https://doc.sensory.com/tnl/7.8/contact.md#contact)

- How to get in touch with Sensory.

<!-- Reference definitions from includes/links.md -->
[vh]: https://www.sensory.com/voicehub/ "Create a custom voice recognizer quickly and easily"

<!-- Abbreviation definitions from includes/abbreviations.md -->
*[API]: Application Programming Interface
*[SDK]: Software Development Kit
*[TNL]: TrulyNatural, Sensory's large-vocabulary speech recognition technology