> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tryhelium.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Paywall Previews On Device
> Test any paywall you've made in Helium, on your device, in seconds.
iOS 4.2.0+ Android 4.4.1+ React Native 3.4.1+ Flutter 3.3.1+
Testing paywalls and entitlements is one of the most annoying parts of shipping an app — so we made it easy.
## Preview Paywalls from your App
**Requirements:** Integrate the Helium SDK into your app and navigate to any existing Helium paywall. You will need to have already set up a valid workflow.
Once you are viewing a paywall, **triple tap** anywhere on the paywall to bring up a list of all your paywalls — you can view the latest published version or latest draft version.
Triple tap again or dismiss the paywall to return to the list of paywalls.
By default, this functionality is only enabled in debug/TestFlight builds for iOS and debug builds for Android.
## Second Try Paywalls
If a paywall has a second try offer configured, the preview includes it: the second try paywall shows on dismiss or on purchase cancel, depending on its configuration, with its own products and prices. Second try is not supported on App2Web paywalls.
## App2Web previews
Available on iOS with these minimum SDK versions:
* Expo / React Native using `expo-helium`: **3.6.0+**
* React Native using `@tryheliumai/paywall-sdk-react-native`: **3.1.10+**
* Flutter (`helium_flutter`): **3.3.12+**
* Native iOS: **4.9.0+**
Previewing an App2Web paywall runs the full app-to-web checkout flow. Real purchases require an [eligible US device](/guides/app2web-previews#purchase-eligibility); other devices simulate purchases. See [App2Web Paywall Previews](/guides/app2web-previews).
## Preview Paywalls from the Helium App (coming soon)
*Not yet available.*
A standalone Helium app on the Apple App Store and Google Play Store where you can log in and view your paywalls.