NFC Plant Care Tags: A Tag Per Pot for Watering Reminders and Care Notes
Stick an NFC tag on each pot, write a care note or watering Shortcut to it, then tap to log or check what the plant needs. Here's how to set it up.
Guides
Practical, plain-language guides on NFC tags — how they work, what they're used for, and how to read, write, and inspect them with NFCore.
NFC Tag Stickers: Materials, Durability, and Where to Stick Them
An NFC sticker is an NTAG chip and antenna laminated in paper, PET, PVC, or epoxy. Here's how each material holds up — and why metal needs a special tag.
Why Your Phone Says "Tag Not Supported" — The Five Most Common Causes
"Tag Not Supported" usually means the chip is fine but your phone can't read it. Here are the five most common causes — and the fix for each one.
Raw NFC Commands: APDUs, Page Reads, and What the Command Console Sends
Raw NFC commands are bytes you send straight to the chip. Here is how READ, WRITE, and ISO 7816-4 APDUs work, and what the Command Console sends.
NFC Memory Dumps and Hex: Reading the Raw Bytes on a Tag
A memory dump shows every byte on an NFC tag as hex and ASCII. Here is how the pages are laid out, how to read a dump, and what each block means.
Lock an NFC Tag Permanently: When (and When Not) to Make It Read-Only
Locking an NFC tag is a one-way switch that makes it read-only forever. Here is how lock bytes work and when permanent locking actually makes sense.
MIFARE DESFire Explained: EV1, EV2, EV3, AES, and Where You'll Tap One
MIFARE DESFire is the secure, AES-based smart-card chip behind most transit and building-access cards. Here is how EV1, EV2, and EV3 differ and what they do.
How to Clone an NFC Tag You Own (and What You Can't Copy)
Cloning a tag you own usually means copying its NDEF data to a blank tag, which is easy. Copying the fixed UID is a different story. Here is what works.
NFC for Smart Home — Pairing Tags With Home Assistant, HomeKit, and Matter
Tap an NFC tag to run a HomeKit scene or a Home Assistant automation, and use Matter's new tap-to-commission setup. Here's how each one works and what to buy.
NFC for iOS Shortcuts — Automate Your Day With a Tap
Stick a 50-cent NFC tag on your desk, dashboard, or nightstand. Tap it, and iOS Shortcuts fires the automation you want — Focus on, lights off, playlist on.
iPhone NFC vs Android NFC — What Each One Can and Can't Do
iPhone and Android both read and write the same NDEF tags. The differences live at the edges — card emulation, MIFARE Classic, background triggers.
How to Build a Digital Business Card on an NFC Tag — vCard, Smart Poster, or URL
Three ways to put your contact info on an NFC tag — a vCard MIME record, a URL record, or a Smart Poster — and which one fits your audience, tag chip, and update cadence.
Make a Wi-Fi NFC Tag So Guests Connect Without Typing the Password
Encode your Wi-Fi credentials on an NFC tag so guests connect by tapping their phone. Here's the record format, the iPhone caveat, and how to pick a tag.
How to Write an NFC Tag with Your Phone — Step-by-Step
Writing an NFC tag means saving an NDEF message to it from your phone: a link, text, contact, or Wi-Fi. Here's how to do it on Android and iPhone.
How to Read an NFC Tag with Your iPhone — Background and Manual Mode
Two ways to read NFC tags on iPhone: background reading on XS and newer, or a manual scan from Control Center or an app. Here's exactly how each one works.
MIFARE Ultralight, Classic, and DESFire — A Plain-English Tour
MIFARE is the NXP chip family inside most NFC cards you tap. Here's what Ultralight, Classic, and DESFire are, what your phone reads, and which one to pick.
NTAG213 vs NTAG215 vs NTAG216 — Which Tag Should You Buy?
NTAG213, 215, and 216 are the same NXP chip family with different memory. Pick the smallest one that fits your payload — here's how to decide.
NDEF Explained: The Universal Format That Lets Any Phone Read Your Tag
NDEF is the NFC Forum's standard application-layer format — the wrapper every consumer NFC tag uses so any compliant phone reads the same bytes the same way. Here is how its messages, records, and TNF values fit together.
NFC vs RFID vs Bluetooth vs Wi-Fi Direct — When to Use Each
Four wireless radios, four jobs. NFC for the tap, RFID for the warehouse, Bluetooth for the headset, Wi-Fi Direct for the file — explained with numbers.
How NFC Actually Works — From Antenna Coupling to NDEF Records
NFC is two ideas stacked on each other — a short-range magnetic link at 13.56 MHz and a record format called NDEF that any phone can read. Once you've seen one record, you've seen all of them.