Best 21 alternatives: apps like 21-Card

10+ similar apps compared and reviewed

3.5 avg rating

10 free apps

Updated November 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

Cardigo Wallet by Tomas Pflanzer

Loyalty cards in your pocket

Editor's Choice

🔧 Utilities

0.0(0 ratings)

FreeIn-App Purchases

Hidden Device Radar by Aurem Digital llc

Strong Contender

🔧 Utilities

5.0(2 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.

Device Check & Hardware Test by 国李

Hardware Test & Benchmark Tool

Worth Considering

🔧 Utilities

0.0(0 ratings)

Free

Device Check & Hardware Test screenshot 1

Device Check & Hardware Test screenshot 2

Device Check & Hardware Test screenshot 3

More apps like 21

2cBoard Keyboard

by Daniel Pohoryles

Free

This keyboard app offers large, dynamic, and predictive keys for easier typing on iPhones and iPads. It aims to enhance the typing experience with its unique layout and features.

Large keysDynamic keysPredictive text

🔧 Utilities

(2)

free with in-app purchases

Compare with 21

Crest Browser

Spaces for your browsing

Free

Organize your online life with distinct browsing contexts for work, personal use, and private browsing. Each context has its own tabs, history, and data, ensuring a clean separation of your digital activities.

Isolated browsing contexts (Spaces)Separate tabs, history, and cookies per SpaceCustomizable Space identity

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

(240)

free with in-app purchases

Compare with 21

AI Sense Ghost SLS Camera

Ghost Vision, AI Art Photo

Free

This app uses LiDAR and infrared light to detect humanoid entities, offering a paranormal investigation tool with AI art features. It provides real-time detection in various conditions and enhanced night vision.

Detects anomalous humanoid entitiesLiDAR-enabled infrared night visionReal-time human figure detection

🔧 Utilities

(351)

free with in-app purchases

Compare with 21