HOW TO BLOCK APPS WITH NFC TAGS ON ANDROID — FREE SETUP GUIDE
You don't need a €62 gadget to use NFC-based app blocking. A €2 NFC sticker and a free app are all it takes. Here's the full setup, start to finish, in under 10 minutes.
Why Physical Friction Works
Android's built-in Digital Wellbeing lets you set daily timers for apps. The problem is the dismiss button — it's always right there. One tap and you're back to scrolling. Software-only blockers like Opal (~€99/year) face the same challenge: the off switch lives on the same device as the temptation.
NFC-based blocking works differently. You link a physical NFC tag to your blocking profile, then place that tag somewhere inconvenient — stuck to the underside of a kitchen shelf, inside a drawer at work, inside your gym bag. When you want to unlock your distracting apps, you have to physically walk to that tag and tap your phone against it. That one extra step is enough to break the autopilot habit for most people.
Products like Brick (€62) and Unpluq (~€27 tag + ~€64/year subscription) sell proprietary NFC hardware for this purpose. But NFC tags themselves are a commodity — a pack of 10 NTAG215 stickers costs €2–5 online. You just need an app to handle the blocking logic.
What You Need
Step-by-Step Setup with nfcGuard
We'll use nfcGuard — a free, open-source app built for this exact purpose. No account, no subscription, no data leaves your phone.
Install nfcGuard
Download from Google Play or get the APK from GitHub Releases. The app is under 5 MB.
Grant Permissions
nfcGuard needs three permissions. Open the app, tap the gear icon — it shows each permission's status with a link to the right settings page.
Display Over Apps — shows the blocking overlay
Battery Optimization: Unrestricted — keeps the service running reliably
On Xiaomi, Samsung, or Huawei devices, also enable Autostart and add nfcGuard to the lock screen cleanup whitelist. These manufacturers aggressively kill background services.
Register Your NFC Tag
Go to the NFC Tags screen (bottom navigation). Tap "+", name your tag (e.g., "Kitchen Tag"), and hold the NFC sticker to the back of your phone. The app reads the tag's unique ID and saves it.
Create a Blocking Mode
Go to the Modes screen. Create a new mode and choose your strategy:
Allow Only — block everything except a whitelist (Phone, Maps, Banking...)
Link your NFC tag to this mode. Only that specific tag can deactivate it — tapping a random NFC object won't work.
Set Schedules (Optional)
Go to Schedules. Create a schedule, pick days and times, and link it to your mode. nfcGuard supports different start/end times for each day of the week — useful when weekdays and weekends have different routines.
You can optionally enable automatic deactivation at the end time, or require the NFC tag to turn off the mode even when the schedule expires.
Place Your Tag and Activate
Stick your NFC tag somewhere that requires effort to reach. Some ideas:
→ Inside a drawer at your desk
→ Inside your gym bag
→ At a friend's house or at your office
→ On your car dashboard (forces you to go outside)
Activate the mode from the home screen. Try opening a blocked app — you'll see a full-screen overlay. The only way past it is tapping your tag.
Buy a few extra tags and create separate modes for different parts of your day. A "Work" mode blocking social media 9–17, an "Evening" mode that blocks everything except music and messaging, a "Sleep" mode that locks down after 22:00. Each mode gets its own tag in a different location.
What If I Lose My NFC Tag?
nfcGuard has a built-in emergency reset. Tap the delete icon on the home screen and follow the safety flow: a 60-second cooldown, then a text confirmation. Select which tags you've lost, and all linked modes are deactivated. Your configurations stay intact — just register a new tag and re-link.
There's no limit on how many times you can use the emergency reset, and you don't need to contact anyone. Just wait 60 seconds and confirm.
Recommended NFC Tags
Any NDEF-compatible NFC tag works. For best results, look for NTAG213 or NTAG215 sticker tags — they're thin, adhesive-backed, and work reliably with all Android phones. Black stickers blend in well. Search "NTAG215 sticker tags" on Amazon or AliExpress. A 10-pack typically costs €2–5.
If no NFC tag is linked to a mode, nfcGuard lets any NFC-capable object deactivate it — your transit card, smartwatch, NFC headphones, even a friend's phone. Useful for getting started before your tags arrive.
Export and Share Your Setup
Once your configuration is dialled in, open Settings and export it as JSON or YAML. Share the file with friends, back it up to Git, or import it on a new device. Two import strategies: Replace (overwrite everything) or Merge (add non-duplicate items).
Looking for a detailed comparison of nfcGuard against Brick, Unpluq, and Opal? Read our Best Free Alternatives to Brick App post.