Gatekeeper: SMS & Call Blocker

Filter spam texts. Set your own rules.

Gatekeeper filters text messages by the words, numbers and prefixes you choose, and blocks calls from the phone numbers you add. Messages are checked on your device and never sent to us.

WHAT YOU GET
• Your own rules for texts: filter SMS by keyword, phone number or prefix. A keyword can be a word such as "jackpot" or "lottery"; a prefix such as +44 or +1900 covers every number that starts with it. Add as many rules as you need.
• Calls: block calls from the phone numbers you add. Enter each one as a full number with country code, at least 7 digits. Prefixes work for texts only, not for calls.
• Allowed list: add numbers, prefixes or sender names that Gatekeeper does not filter, for example the name of a shop that sends you messages you want to keep.
• Your lists: three tiles on the Home screen open your blocked texts, your blocked calls and your Allowed list.
• Messages stay on your device: Gatekeeper never uploads your messages or your call history. Message text is never stored or sent anywhere. Details of the small profile we keep for your installation are in our Privacy Policy.

HOW IT WORKS ON IPHONE
Gatekeeper works as an iOS message filter. When a text arrives from a sender who is not in your Contacts, iOS asks Gatekeeper what to do with it. Gatekeeper compares the sender and the words with your rules, on your iPhone. A text that matches goes to the spam list in Messages instead of your inbox. Apple applies message filters only to senders who are not in your Contacts, so messages from people you have saved are not filtered.
For calls, Gatekeeper uses Apple's call blocking. Once you switch it on, calls from the numbers you added are blocked.

SET UP IN THREE STEPS
1. Open Gatekeeper and follow the in-app guide to switch on the message filter in iOS Settings.
2. Add your first rule: a word, a number or a prefix.
3. Switch on call blocking in the in-app guide, then add the numbers you want to block from calling you.

OPTIONAL SUBSCRIPTION PLANS
Pro is an optional subscription. It adds Smart matching and the AI filter. Your own rules, the Allowed list and call blocking do not need a subscription.

THE AI FILTER AND SMART MATCHING (OPTIONAL, PRO)
The AI filter (Pro) checks messages against ready-made spam word lists in several languages, chosen and maintained by us and built into the app. It is keyword matching, not machine learning, and it works on your device.
Smart matching (Pro) also catches common spelling variants of your words, such as with or without accents. It works for words written in Latin letters.
Both are optional. Turn either off at any time and filter only your own words.

GOOD TO KNOW
No filter is perfect. Check the spam list in Messages now and then. Call rules need a full number with country code (at least 7 digits). Short prefixes such as +44 work for texts only. Apple applies message filters only to senders who are not in your Contacts.

Terms of Use: https://gatekeeperapp.web.app/terms