Best 21 alternatives: apps like 21-Card

10+ similar apps compared and reviewed

3.8 avg rating

9 free apps

Updated October 2026

Najib El guertit

Whether you want more options like 21 or a completely different take on the same concept, our curated list of 10+ similar apps has you covered. Updated for 2026 with the latest ratings and comparisons.

Top Alternatives to 21

MegaText: Big Text LED Banner by 雷陈

Scroller, Marquee & Signboard

Editor's Choice

🔧 Utilities

0.0(0 ratings)

$2.99

MegaText: Big Text LED Banner screenshot 1

MegaText: Big Text LED Banner screenshot 2

MegaText: Big Text LED Banner screenshot 3

MegaText: Big Text LED Banner screenshot 4

MegaText: Big Text LED Banner screenshot 5

Hidden Device Radar by Aurem Digital llc

Strong Contender

🔧 Utilities

5.0(1 ratings)

FreeIn-App Purchases

Detect hidden cameras, trackers, and smart devices using Bluetooth, Wi-Fi, and NFC signals. Get real-time threat scoring and a proximity graph to locate suspicious devices. Protect your privacy by scanning hotel rooms, rentals, or your home.

Cardigo Wallet by Tomas Pflanzer

Loyalty cards in your pocket

Worth Considering

🔧 Utilities

0.0(0 ratings)

FreeIn-App Purchases

More apps like 21

Inscribe - Every spark counts

Let brilliance fill your soul.

Free

Capture and reflect on inspiring words with this intuitive tool. Save meaningful quotes and add your own thoughts to foster personal growth. Features include dark mode, multi-language support, and modern iOS interactions.

Record quotes and thoughtsView saved quotes with sourcesDark mode support

🔧 Utilities

(3)

free with in-app purchases

Compare with 21

Photo Organizer: AI Cleaner

AI Duplicate Photo Cleaner

Free

This app uses AI to scan and group similar or duplicate photos on your device, allowing for efficient bulk deletion to free up storage space. It prioritizes privacy by processing all data locally and offers safety features to prevent accidental deletion.

AI scanning for similar photosBulk delete duplicate photo groupsIntuitive photo organization

🔧 Utilities

(1)

free with in-app purchases

Easily read and write information to NFC tags. This utility allows for quick data transfer and interaction with NFC-enabled devices.

Read NFC tagsWrite NFC tagsNFC data interaction

NFC Tag Writer & Reader +

This app offers a secure and user-friendly method for accessing websites and networks. It provides fast authentication and robust protection against various cyber threats like phishing and man-in-the-middle attacks.

Fast authentication via notificationsAsymmetric key protectionSecure device mechanism authentication

Air Tag Detector: Find Tracker

Find My AirTag, SmartTag, Tile

Free

Detect unknown Bluetooth trackers like AirTags in your vicinity. Provides real-time scanning, movement pattern analysis, and alerts to help you maintain privacy and security against unwanted tracking.

Real-time Bluetooth device scanningMovement pattern detectionDistance estimation via signal strength

🔧 Utilities

(102)

free with in-app purchases