> For the complete documentation index, see [llms.txt](https://docs.tryterra.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tryterra.co/unified-api/mobile-only-sources.md).
# Mobile-only sources
## Overview
The primary use of the mobile SDKs is to allow you to access data from providers **that do not have a Web API.**
{% hint style="warning" %}
## Data Sources requiring the Terra **Mobile-SDK**
The **Mobile SDK** is **ONLY** used to connect to the following integrations:
1. **Apple Health -** iOS
2. **Samsung Health -** Android
3. **Google Fit & Health Connect**- Android.
Note: the [Unified API](broken://pages/u4aCTkJiebhGE1aqPS8y) is the preferred way to connect to Google Fit due to better reliability.
For **ALL** other integrations, please refer to Integration Setup the [Unified API](broken://pages/u4aCTkJiebhGE1aqPS8y).
{% endhint %}
Data flow diagram for data from Apple Health/Samsung Health/Google Fit.
Implementation details will vary based on your development framework/platform.
Please refer to your framework's respective guide below: