Rumskrot Nearfield
The NFC toolkit for iPhone — read, write, inspect, audit, and automate every tag you meet. Where most NFC apps stop at “tap to copy a URL”, Nearfield exposes the whole tag: chip family, manufacturer, raw memory, NDEF records, originality signature, lock state.
Coming SooniPhone
More Than Tap-to-Copy
Fourteen native NFC tools — read, write, inspect, audit, automate
Your Tag Isn’t Anonymous
Chip family, manufacturer, NTAG21x originality signature — surfaced on every read
Stack Records, Write Once
URL + Wi-Fi + vCard + Smart Poster onto one tag, in any order
504 Bytes — Every Page
NTAG21x raw memory dump, hex + ASCII, capability container decoded
Every Byte, Labelled
Tap any NDEF record — TLV bytes annotated with field names and values
Lock It, Recoverably
Install or clear NTAG21x write protection — reads still work, only writes are gated
Talk to Credit Cards
Raw ISO 7816 APDUs — SELECT, READ BIN, GET DATA — with status-word translation
Recall, Replay, Bookmark
Every read and write, on-device. No accounts, no cloud, no telemetry.
iPad
More Than Tap-to-Copy
Your Tag Isn’t Anonymous
Stack Records, Write Once
504 Bytes — Every Page
Every Byte, Labelled
Lock It, Recoverably
Talk to Credit Cards
Recall, Replay, Bookmark
Features
Read Tag
Chip family, manufacturer (NXP / TI / ST / Sony / Infineon + 65 more), NTAG21x variant, capacity, originality signature bytes, decoded NDEF records — all in one scan.
Tag Inspector
Full NTAG21x raw memory dump, page by page, hex + ASCII. Capability container decoded so you can see lock bits and write access at a glance.
NDEF Tree Inspector
Tap any record to see its bytes annotated by field. URI prefix codes expand. Text records split into status byte + language + body. Wi-Fi records walk the WSC TLV stream.
Multi-Record Composer
Stack URL + Text + Wi-Fi + Smart Poster onto a single tag in any order, with live byte estimation as you build.
Batch Write
Write the same payload to N tags in a row. “Tag N of M” in the system sheet, live counters, per-tag failure logging.
Quick Link & Presets
Phone, SMS, email, and map URIs from structured inputs — no typing tel: by hand. Twelve curated starting points: business card, office Wi-Fi, App Store install, Apple Music, Spotify.
NTAG Password
Install or clear NTAG213/215/216 write protection. Recoverable: reads still work, only writes are gated.
APDU Console
Send raw ISO 7816 APDUs to 7816 cards. Status-word translation for the common SW1/SW2 pairs.
Wallet Pass & Erase
Write a tag whose URL routes to an Apple Wallet pass on tap. Erase NDEF and optionally permanent-lock when you’re done with a tag.
Originality Signature
NTAG21x originality signature via READ_SIG. 32 bytes surfaced for off-device verification — proof the tag is genuine NXP, not a clone.
Saved Tags & History
Bookmark any payload, re-write it in one tap. Every read and write recorded automatically. Tap to recall the original result.
Tag Clone
Read tag A, tap Clone, hold tag B. Every NDEF record migrates over.
App Intents Everywhere
Every tool is an AppIntent. Drive Nearfield from Siri, Shortcuts, and the Action Button.
Privacy-First by Design
Everything runs on-device. No backend, no analytics, no third-party SDKs. No accounts, no sign-up. History lives in your local SwiftData store.
About
Rumskrot Nearfield is built natively in Swift on top of CoreNFC and Swift Concurrency — no third-party SDKs, no relays, no servers. Every read and write happens on your iPhone’s NFC radio.
NFC reading on iOS requires the iPhone’s hardware. Nearfield runs on iPad too for browsing history and composing payloads, but the radio itself lives in your phone.
Nearfield pairs naturally with the rest of the toolbelt: Rumskrot Beacon for network probes, Rumskrot Pulse for Bluetooth LE, Rumskrot Terminal for SSH, and Rumskrot Remote for VNC.
Free. No IAP, no ads, no premium tier.