# Introduction

Welcome to the Tonomy SDK developer documentation.

Tonomy enables developers to **integrate self-sovereign identity and secure data storage** into their **Web2 and Web3 applications**. Whether you’re building a **SaaS platform requiring high-security logins** or a **Web3 dApp needing user-controlled digital signatures and credentials**, Tonomy provides a privacy-first, developer-friendly solution.

With **Tonomy ID**, users log in without passwords, sign data with private keys stored securely on their devices, and control their personal data—**without relying on third parties**.

### Why Integrate Tonomy?

* **Frictionless User Authentication**: Passwordless Single Sign-On (SSO)
* **Strong User Verification**: W3C Verifiable Credentials
* **High-Security Digital Signatures**: Non-repudiation for documents, transactions, and data
* **Data Privacy by Default**: Sovereign Data Vault for user-controlled storage
* **Flexible for Web2 & Web3**: Use in SaaS platforms, enterprise apps, dApps, and beyond

{% hint style="info" %}
Try it out now: [Demo App](https://demo.tonomy.io)
{% endhint %}

{% hint style="info" %}
Read the [Tonomy ID White Paper](https://tonomy.io/about/whitepapers)
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.tonomy.io/introduction.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.