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The promo codes are inside the emails, so the app has to read them to find them. It asks for Google's read-only Gmail permission, downloads the messages Gmail has filed under Promotions straight to your phone, extracts the deals, and throws the emails away. Nothing is sent to us. See the privacy policy for the details.

No. It only requests messages in Gmail's Promotions category, within the look-back window you set (7 to 90 days). Personal mail, receipts, updates and everything else are never fetched. Google's permission screen says "view your email messages" because Google has no narrower read-only permission for a single category.

You'll see this while CodeHound is going through Google's verification process for apps that read Gmail. The app behaves exactly the same either way. If you're using a test build, you'll also be signed out after seven days, which is a Google rule for unverified apps; just sign in again.

• Make sure Gmail's inbox categories are turned on and the email actually lands in the Promotions tab. CodeHound only scans that category. Emails you've filed elsewhere, and emails from stores that Gmail puts in Primary, aren't scanned.
• Try a longer look-back window in Settings, then pull to refresh.
• Turn off Codes only in Settings to see offers that don't need a code.
• Codes that exist only inside an image with no text can't be read.
• If a scan is interrupted by Gmail's rate limit, the status line says how many emails were skipped. Scanning again a minute later picks them up.

CodeHound reads dates as US month/day, so "9/10" is September 10. When it isn't sure about a code it leaves it out rather than guessing; tap the deal and use Open in Gmail to check the original. If you spot a pattern it gets wrong, email us the phrasing and we'll teach it.

In the app, open Settings and tap Sign out. That revokes CodeHound's access with Google, removes the token from your phone and deletes the saved deals. You can also remove CodeHound at myaccount.google.com/permissions, which stops it from reading anything immediately.

All of your data is on your phone. Signing out deletes the saved deals; deleting the app deletes everything. There is nothing stored on our side, because there is no "our side": CodeHound has no server.

Yes, as long as your administrator allows third-party apps to access Gmail and your account has inbox categories enabled. Some organisations block this.

Not yet. CodeHound relies on Gmail's Promotions category to know which emails are promotional. Other providers are on the wish list; tell us which one you'd like.

CodeHound is free and a small banner ad in the deals list pays for it. The ads come from Google AdMob and are requested as non-personalized everywhere, so they are based on the ad slot, not on you, and the app never asks for permission to track. Your email and your deals are never shared with the ad service. In the EEA, the UK and Switzerland a consent form appears first, and Settings → Privacy options lets you change your answer later.

No, CodeHound is iPhone only for now.