# TrueOrigin

> Web-to-app install attribution for iOS: see which ad brought each install, trial and purchase, and send them back to Meta and TikTok.

- [Introduction](https://docs.trueorigin.dev/index.md): See which ad brought each install, trial and purchase of your iOS app, and send them back to Meta and TikTok.
- [Quickstart](https://docs.trueorigin.dev/quickstart.md): From sign-up to your first matched install in about fifteen minutes.
- [iOS SDK](https://docs.trueorigin.dev/sdk/ios.md): Add TrueOrigin to a native iOS app with Swift Package Manager.
- [React Native](https://docs.trueorigin.dev/sdk/react-native.md): Add TrueOrigin to a React Native or Expo app.
- [Reading the attribution](https://docs.trueorigin.dev/sdk/attribution.md): Find out in your app which campaign an install came from.
- [Tracking links](https://docs.trueorigin.dev/tracking-links.md): One link per campaign, and the URL parameters that name the campaign, ad set and ad.
- [RevenueCat](https://docs.trueorigin.dev/revenuecat.md): Count trials, conversions and revenue per campaign.
- [Postbacks to Meta and TikTok](https://docs.trueorigin.dev/postbacks.md): Send matched installs and purchases back to the ad network, so it can optimise on them.
- [Ad spend](https://docs.trueorigin.dev/ad-spend.md): Import spend from Meta or TikTok to see CPI and ROAS per campaign.
- [Troubleshooting](https://docs.trueorigin.dev/troubleshooting.md): When an install does not show up, or does not match.