To block porn on iPhone, use three layers. Turn on Screen Time's Limit Adult Websites setting. Add a DNS blocker that filters every app and browser. Then bring in a partner who finds out if protection turns off. Each layer catches something the others miss. Screen Time is free and built in. The DNS layer reaches past Safari, and the partner covers the moment you want to switch it all off.
In short
Screen Time can limit adult websites and block specific sites you list, and it costs nothing.
A DNS blocker filters every app and browser on the phone, so a second browser is no longer a way around the block.
Any blocker can be turned off by the person who set it up, so a partner who sees changes is what keeps the setup in place.
No layer is perfect, so test your setup in a few places and close the gaps you find.
How do you block porn on iPhone with Screen Time?
Screen Time is the place to start. It's already on your phone, and Apple's adult content limit takes a few taps to turn on. In iOS 26, the steps look like this:
- Go to Settings > Screen Time > Content & Privacy Restrictions and turn on Content & Privacy Restrictions.
- Tap App Store, Media, Web, & Games > Web Content.
- Select Limit Adult Websites.
- To block a specific site, tap Add Website below Never Allow and enter the site's URL.
Next, lock those settings. In iOS 26, go to Settings > Screen Time, scroll down, tap Lock Screen Time Settings, and enter a four-digit passcode twice. Apple says this passcode is separate from the one that unlocks your phone. Once it's set, you have to enter it before you can change any Screen Time settings.
What does Screen Time miss?
Screen Time does real work, and for some people it's enough. It also has gaps that are worth knowing before you trust it.
- You probably know the passcode. If you set it yourself, you can type it in at the exact moment you most want to. A four-digit code you chose isn't much of a wall late at night.
- Browser coverage isn't spelled out. Apple's iOS 26 page on blocking websites doesn't say which browsers or apps the web content limits apply to. Test it yourself in Safari, in any other browser you have, and from links inside apps.
- The menus change. As the aside above shows, Screen Time looks different between iOS versions, so a guide written for one version may not match your phone.
- Changes are silent. If you turn the limit off, nobody else knows.
None of this makes Screen Time a bad choice. It makes it a first layer, not the whole setup.
How does a DNS blocker cover every browser and app?
DNS is the step where your phone looks up a website's address. Before any app can load a page, the phone turns a name like example.com into an address it can connect to. A DNS blocker sits at that step. If a site is blocked, the lookup goes nowhere and the page doesn't load.
Because the filter runs for the whole phone, it doesn't care which app asked. That covers a few places where people tend to slip:
- Other browsers. Switching from Safari to another browser doesn't get around it.
- Private tabs. A private tab still has to look up the address. Why blockers fail in incognito mode goes into this in more detail.
- Links inside apps. A link that opens in a social or messaging app goes through the same lookup.
Blockd works this way. It filters at the DNS level, so blocks apply in every app and browser, not only Safari. It also has an adult content filter, safe browsing, and safe search that you can turn on, and you can add any specific site you want. Subdomains are included. For a wider look at the options, see how to block websites on iPhone.
| Layer | What it catches | What it misses |
|---|---|---|
| Screen Time | Adult websites Apple's limit knows about, plus sites you list | Coverage outside Safari isn't stated, and you may know the passcode |
| DNS blocker | Blocked addresses in every app and browser | Page content, a second VPN app, apps with hard-coded DNS |
| Partner | The moment protection turns off or the app is deleted | Nothing on its own; it needs a blocker to watch |
Three layers for blocking porn on iPhone, and what each one covers.
Why add an accountability partner?
Here's the honest part. Any blocker can be turned off by the person who installed it. Screen Time has a passcode you may know. A DNS app can be switched off or deleted. Blockd doesn't try to make that impossible. It makes turning it off visible to a partner, and that visibility is the deterrent.
Think about what a weak moment feels like. You're tired or bored, and the off switch is close. If turning off the block is private, it costs nothing right then. If someone you trust will know, the choice carries weight, and that pause is often enough to choose differently.
With Blockd, if protection turns off, your partner gets an alert within seconds. If the app is deleted, your partner is alerted within minutes, once the phone goes quiet. Your partner sees your protection status, your blocklist, and every change to it. They don't see your full browsing history. Blockd doesn't read your messages or track your location. If you're new to the idea, what an accountability partner is covers how the role works and who fits it.
What gaps are left even with all three layers?
A setup that feels airtight makes it easy to stop paying attention. So here are the limits, stated plainly.
- DNS blocking decides by address, not content. It can't see what's on a page, and it doesn't take screenshots. A site that isn't known to the filter can still load until you add it.
- iPhone runs one VPN at a time. Connecting another VPN app can replace Blockd's connection on iPhone. Your partner is alerted if protection turns off.
- Some apps bring their own DNS. Apps that use their own hard-coded DNS can get around DNS filtering.
- Other devices aren't covered. A block on your phone does nothing for a laptop or tablet. If you use a Mac, how to block porn on Mac walks through that side.
These gaps don't close with a tighter lock. They shrink when you know where they are and someone is paying attention with you.
How do you set up all three layers tonight?
You don't need a perfect setup. You need one where the quiet exit is gone.
- Turn on Screen Time's adult website limit. Follow the steps above for your iOS version.
- Have someone else set the Screen Time passcode. If a partner picks it and keeps it, you can't type it in on impulse.
- Install a DNS blocker and turn on its adult content filter. Add any specific sites you already know are a problem.
- Invite a partner. Pick someone steady who won't lecture you after a slip, and agree on what the alerts mean.
- Test it. Try a blocked site in Safari, in a second browser, in a private tab, from a link inside an app, and on cellular data. Wherever it loads is the next gap to close.
Then decide ahead of time what you'll do if an alert goes out. A short, honest message beats silence. If the habit feels out of your control or is hurting your life, consider talking with a licensed therapist alongside your partner.