How to use an NFC tag to block apps on your phone

This is the guide the companies selling NFC blockers have not written, and the reason is not flattering to anyone: the free, do-it-yourself version is weaker than it sounds on iPhone and fiddly on Android. It is still worth knowing exactly what a tag can do, because the right setup costs almost nothing.

What an NFC tag actually is

A small sticker or disc with a chip that a phone's reader powers when the two are almost touching. Every tag carries a unique identifier set at the factory, and that identifier is usually all an automation needs — Apple's Shortcuts guide says that other than the unique identifier, the contents of the tag are ignored. The tag has no battery and does nothing until a phone reads it.

The common ones are NXP's NTAG213, 215 and 216, which differ only in how much they can store (144, 504 and 888 bytes). For triggering an automation, any of them works; buy the cheapest pack. Before you buy anything, check that your phone has a reader.

On iPhone: Shortcuts can react to a tag, but cannot block an app

Apple's Shortcuts app has an NFC Tag trigger for automations. Setting one up takes a couple of minutes, and the menu wording differs between iOS versions:

1. Open Shortcuts and go to automations. On iOS 26, tap Automation, then + in the corner, then Create Personal Automation; on iOS 27, open or create a shortcut, tap Edit, then Automation.
2. Choose the NFC Tag trigger and scan your tag to register it.
3. Add what should happen — for this purpose, turning on a Focus.
4. Let it run without asking. On iOS 26, turn off Ask Before Running; on iOS 27, enable Allow Running When Locked. Apple notes you may also need to set individual actions to run automatically, or you will get a notification asking you to run it instead.

Now the honest limit. A Focus, in Apple's own description, silences notifications or allows only specific ones, and can switch to a customised Lock Screen or Home Screen page. That is useful — a Home Screen page with no distracting apps on it removes the reflex tap — but nothing in Apple's documentation has a Focus stop an app from opening. The app is still one search away. Apple lets you lock an app behind Face ID or your passcode from the Home Screen, but documents no Shortcuts action to do it.

So on iPhone, a tag plus Shortcuts gives you a quiet phone and a cleaner Home Screen at a tap. It does not give you a block.

On iPhone: a blocker that listens for a tag

Real blocking on iPhone goes through Apple's Screen Time permission, and several blockers use an NFC tap as the thing that ends — or starts — a session:

• <b>Foqos</b> — free and open source, iPhone only, and works with any NFC tag you buy, or a printed QR code. The cheapest real answer.
• <b>Brick</b> — its own purpose-built NFC device, $59 once, no subscription.
• <b>Unpluq</b> — its own NFC tag, which works only with a paid subscription.
• <b>Spark</b> — an NFC key paired to the app; locking is a tap in the app, and unlocking means tapping your phone on the key wherever you left it.

On Android: automation apps, with caveats

Android has no built-in way to start Digital Wellbeing's Focus mode from a tag — Google documents only turning it on now, on a schedule, or from Quick Settings. Third-party automation apps fill the gap:

• <b>Tasker</b> has an NFC Tag event that can react to a tag by its identifier, so you do not need to write anything to it. A common pattern: when the tag is scanned, turn on a profile that sends you to the Home Screen whenever a blocked app opens. Tasker's Kill App action exists but, per its own listing, needs root on some devices.
• <b>MacroDroid</b> has an NFC Tag trigger, but you must first write an identifier to the tag with MacroDroid, and only writeable NFC tags work — writing erases what was on it. Its Launch Home Screen action works like pressing Home; force-stopping or disabling apps needs root or Shizuku.

Both work, and both are nudges rather than blocks: sending you home is a reflex-breaker, not a wall, and the automation is as easy to switch off as it was to switch on. If you want a tag to be the only way back into your apps, you need a blocker built around that — Spark's NFC key is one.

Is NFC allowed in India?

Yes. We found no restriction on consumer NFC in India. NFC works at 13.56 MHz, and the band around it, 13.553 to 13.567 MHz, is listed in the country's National Frequency Allocation Plan as exempt from licensing for very low-power devices, under rules notified in 2010. It is the same technology behind tap-to-pay, which is widespread.

Where a tag stops short, whatever you use

• Any standard tag can be copied with a phone. That matters only if you are trying to stop somebody else; against your own 11 p.m. self, the walk to wherever you left it is what does the work.
• The tag only helps if it is somewhere inconvenient. A tag on your desk is a button.
• NFC must be switched on for the tap to register, and switching it off is a setting you control — the tag adds friction; it does not enforce anything by itself.