Accessibility Service
RequiredWhy: without it, Guardrail cannot detect sensitive data across other apps at all — the app runs, but does nothing.
Where to enable it: Settings → Accessibility → Guardrail → toggle on.
Installing Guardrail on Android
Guardrail is installed straight from the Google Play Store — no settings changes needed to install it. The part people miss is turning on one permission afterward, without which Guardrail can't actually detect anything.
Google Play StoreNo sideloading / no unknown-sources toggle needed
"Accessibility" here doesn't mean what you think
Android's Accessibility Service permission sounds like it's only for accessibility tools — but it's also the standard way any app is allowed to see across other apps. Without it turned on, Guardrail cannot detect anything at all, even though the app itself installed fine.
Install from Google Play
Search for "iDox.ai Guardrail" on Google Play, or use the link on our download page, and tap Install.
Open the app
Once installed, open Guardrail from your app drawer or directly from the Play Store page.
Turn on Accessibility Service (required)
Guardrail will prompt you to open Android's Accessibility settings. Find Guardrail in the list and toggle it on. Without this step, Guardrail cannot detect anything across other apps.
RequiredSettings → Accessibility → GuardrailToggle onAllow "Display over other apps" (recommended)
This lets Guardrail show its floating alert bubble. It's optional — without it, alerts show as notifications instead.
Allow notifications (recommended)
Used for the foreground service indicator and as a fallback alert when the floating bubble is off. Also optional, but recommended so you don't miss an alert.
Permissions, explained
One is required for Guardrail to function at all. The other two just improve how alerts are shown.
Display over other apps
RecommendedWhy: shows Guardrail's floating alert bubble on top of whatever app you're using. Without it, you'll still get alerts — just as notifications instead of a bubble.
Where to enable it: Settings → Apps → Guardrail → Display over other apps → Allow.
Notifications
RecommendedWhy: powers the ongoing foreground-service notification and acts as the fallback alert when the floating bubble is turned off.
Where to enable it: Settings → Apps → Guardrail → Notifications → Allow.
One thing Guardrail does not need
Guardrail does not request "Notification access" (the permission that lets an app read other apps' notifications). If a review or forum post mentions it, that's not part of Guardrail — you can safely ignore any prompt asking you to enable it for this app.
Common issues
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