Comparison

Onyx Magic vs MemDatStack

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Onyx Magic

This utility uses AI to remotely alter captured photos in real-time. It allows for seamless modifications to images moments after they are taken, directly on a spectator's device. Create impossible effects like changing playing cards, revealing hidden messages, or altering clock times within photos.

Highlights
  • Real-time AI photo modification
  • Remote image alteration
  • Spectator's camera integration
  • Physical photo printing (Onyx Print)
  • Third-party app integrations
  • Variable delayed input
Read full description

Onyx is a revolutionary utility that allows you to modify a captured image in real-time using variable input data. Using cutting edge AI, Onyx lets you remotely create seamless alterations to photos moments after they've been taken - all with your spectator's camera. For example: — Make a playing card appear in your spectator's wallet. — Morph your spectator's shadow to look like their thought of animal. — Take a photo of your spectator holding a signed card. They name *any* other card. The signed card in the photo transforms to match their thought. — Supplement your Gypsy Queen routine with Onyx: zoom in on a photo of your spectator holding the Queen of Hearts for the reveal. — Reveal a thought-of word, name, or initials hidden naturally in the light reflections of a spectator's eye. — Change the time on a photo of a clock. — Remove your spectator's wristwatch in a photo, making it sbeem that it was removed earlier. ...and more! If you can describe it, Onyx can likely create it. Onyx is particularly great for revealing something ephemeral. Photograph a shadow, clouds, a TV screen or more, and Onyx will realistically insert their free choice. * Variable Delayed Input Inspired by the popular variable trigger system featured in DFB X, Onyx pauses and automatically waits for input, letting you remotely modify a photo *after* it's been taken. * Cutting Edge Technology Take a photo, then have your spectator make a free choice. Onyx's advanced technology seamlessly transforms the photo remotely. * Create Unlimited Effects Change signed playing cards, reveal initials and names, or modify writing. Reveal *anything you can imagine* within a genuine photo you just took. * Your Integrations. Their Camera The effect happens entirely with the spectator's camera. With Onyx's powerful integrations, your phone never needs to leave your pocket. * Invisible, Advanced Technology As only the spectator's device is in play, Onyx remains hidden and inconspicuous. * Third Party Integrations Use your favourite magic apps' input methods, including: — Earworm's covert typing Web Search & Notes input — Native voice input — Native clock swipe input — WebFX's Wrist Gestures — WikiTest — PeekSmith — Bridge ...and any compatible third-party app. # Introducing: Onyx Print Onyx Print brings Onyx’s digital effect into the real world. # Produce Physical Photographs Instead of revealing information only on a screen, Onyx Print can generate and automatically print images on a pocket printer, allowing you to produce a real photograph from your wallet, pocket, or envelope for a powerful ending. # Dynamic Prompting Onyx Print uses the same dynamic prompting and covert input system that powers Onyx. Use any of Onyx’s input methods, and Onyx Print will automatically generate and print an image to match. # Use Your Own Photos You can even modify existing photos. For example: have Onyx Print set up with a photo of yourself and have a spectator name any place in the world. Onyx Print will then create and automatically print a realistic photo of you in that exact location, ready to reveal. # Works With Other Apps Onyx Print can even monitor your photo library and automatically print images saved by other apps. When an app saves a photo, Onyx Print can print it. Onyx Print is an in-app purchase within Onyx, and currently supports the Instax mini Link+, with plans for additional printers in the future. Onyx is a tool specifically designed for entertainment purposes. It uses purchaseable in-app credits or a funded OpenRouter account for best-in-class automatic edits. Onyx supports: Arabic, Bengali, Bulgarian, Chinese simplified and traditional, Croatian, Czech, Danish, Dutch, English, Estonian, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Latvian, Lithuanian, Norwegian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swahili, Swedish, Thai, Turkish, Ukrainian, Vietnamese

About

MemDatStack

This tool assists magicians in memorizing card stacks with customizable quizzes. It supports various popular stacks and question types, offering detailed feedback on incorrect answers to improve learning.

Highlights
  • Supports multiple popular card stacks
  • Variety of quiz settings
  • Customizable quiz questions
  • Tracks recent quiz results
  • Reviews incorrect answers
  • Audio feedback option
Features
Read full description

A highly configurable tool to help magicians trying to memorize a stack of cards. Pick from multiple commonly used stacks, indicate which cards in the stack you believe you already know, choose from a variety of quiz settings, and take quizzes to help you learn your stack. You can see your recent quiz results, and review any questions you got incorrect. Supported stacks: Mnemonica, Aragon, Aronson, Particle System, Redford, Joyal Supported questions: Card to Location, Location to Card, Card Before, Card After Quiz options: multiple choice, number of multiple choices, questions per quiz, optional time limit to answer, delay after correct/incorrect answers, audio feedback, ask more often about cards/locations you've recently gotten incorrect

Screenshots

Onyx Magic4 screens
MemDatStack4 screens

Verdict

The call

The clearest difference is price: MemDatStack at Free against Onyx Magic's $64.99. MemDatStack also leads on in-app purchases (none vs 2). Onyx Magic's advantage is ratings volume (13 vs 1). On rating, update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

MemDatStack is free to download; Onyx Magic costs $64.99 up front. Onyx Magic sells 2 one-off in-app purchases. MemDatStack asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Onyx Magic against 5.0 for MemDatStack. That said, the two scores are not equally well evidenced: Onyx Magic has 13 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Onyx Magic ships an update fortnightly, MemDatStack every 9 days. Both last shipped on October 5, 2026.

Scorecard4 real differences · 6 level
Onyx Magic versus MemDatStack: the parameters behind the verdict, then further details
ParameterOnyx MagicMemDatStack
Price$64.99Free — better
Rating5.0 (13 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings13 — better1
Update frequencyFortnightlyEvery 9 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidFree — better
DevicesiPhoneiPhone, iPad — better
Requires iOS18.2 — better18.6
Further details — not scored
Size36 MB6 MB
Age rating4+4+
DeveloperMarc KersteinCirce Apps LLC

In-app purchases

2 purchases

Onyx Magic

One-time2
  • 100 Onyx Credits$19.99
  • Onyx Print$49.99
None

MemDatStack

No in-app purchases

Questions

Is Onyx Magic free?
Onyx Magic costs $64.99, and also offers in-app purchases.
Is MemDatStack free?
MemDatStack is free to download, with no in-app purchases.
Which has better reviews, Onyx Magic or MemDatStack?
Onyx Magic and MemDatStack are both rated 5.0 out of 5 on the App Store, from 13 and 1 ratings respectively.
Do Onyx Magic or MemDatStack have ads?
Neither Onyx Magic nor MemDatStack shows ads.
Which is updated more often, Onyx Magic or MemDatStack?
Onyx Magic ships an update fortnightly, and MemDatStack every 9 days. Most recently, Onyx Magic was updated on October 5, 2026 and MemDatStack on October 5, 2026.

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