# ISO - Kerstein & Qualter — Digital meets analogue

> Digital magic app for performing illusions with spectator's phones. (iPhone/iPad app by Marc Kerstein.)

- Source: https://appshunter.io/ios/app/iso-kerstein-and-qualter/id1662170624 (this page in markdown: same URL + `.md`)
- Developer: [Marc Kerstein](https://appshunter.io/developer/821255617)
- Category: Entertainment
- Price: $59.99 with in-app purchases
- Rating: 5.00/5 from 28 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 19 MB
- Languages: American English
- Released: 2023-02-02
- Data updated: 2026-08-15
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/iso-kerstein-and-qualter/id1662170624/reviews.md

## What is ISO?

“Marc's apps are unbelievable.”
—David Blaine

ISO is a digital solution which enables many analogue effects.

ISO lets you perform miracles using a borrowed phone. 

*** You can use ISO for:
- Bill to impossible location
- A book test with ANY printed text (a restaurant menu, a borrowed book, a magazine, etc)
- Pegasus page
- Playing card forces
- Stacked deck effects
...and so much more!

For example... imagine:

- You ask your spectator to borrow a bill, which they place on the table in front of them.
- Using THEIR phone, you openly take a photo of the bill to verify later.
- You crumple the bill into a ball in your hand, and have your spectator hold your wrist.
- You slowly open your hand to show that the bill has now VANISHED!
- The spectator then checks under their bag to find the bill!
- They check the serial number… it MATCHES the photo! It’s the SAME bill!


* Your phone is NEVER in play!
ISO only uses the spectator’s phone during the effect, meaning your phone is never seen.

* Carefully justified in every way
All stages of ISO’s possible effects and routines have been carefully thought through and are justified at each step.

* Works in ANY language
ISO is performable in any language. No text is visible during the effect, and so ISO can be used in any country or region.

* Introducing Serial AR
A new way to use ISO in collaboration with William O'Connell. ISO is now even easier to perform, removing the need to take a photo in advance! (Serial AR requires a one-off, optional in-app purchase. It currently works with GBP, USD, EUR, CAD, HKD, CHF, KRW, BRL, RUP, INR bills, with more being added over time.)

* Multiple pairing methods
Includes an adaptive peek screen, plus optional printable pairing stickers and NFC tag support.

* Fully customisable
The many included settings, features and modes available let you use ISO for many different effects.

* WikiTest pairing integration
Performing ISO can leave your spectator paired and ready to perform WikiTest at the conclusion of ISO’s effect.

* VERY easy to perform
* NO accomplice used
* NO memory work needed

ISO is for entertainment purposes only.
Please get in touch to discuss video/audio/TV/internet broadcasting of any description of this effect.

## Key features

- Bill to impossible location
- Book test with any printed text
- Playing card forces
- Uses spectator's phone
- Works in any language
- Optional Serial AR purchase
- Multiple pairing methods

## Pricing and in-app purchases

Base price: $59.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Serial AR | $19.99 | one-time |


## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/iso-kerstein-and-qualter/id1662170624/reviews.md

### 5/5 — 3 reviews as of November ‘23 is mad!

*2023-11-14*

This effect is absolute “killer” material and my audiences have been blown away with it. Couldn’t be easier to learn and perform. It should be part of every magicians portfolio.  
As with all of Kerstein’s output, there are constant updates, and his customer service with any problems (very rarely!) Is virtually immediate.

### 5/5 — Appsolutely Brilliant

*2023-04-15*

With ISO, Marc has created another reliable and versatile magic app that allows for mind blowing performances using a borrowed phone of a spectator. (Nothing is installed on their phone). The app runs flawlessly; video and written instructions are provided within the app. As always, Marc continually updates his apps, keeping them working as software updates and adding incredible features. Excellent support and customer service.

### 5/5 — Gonzalez

*2023-04-09*

I have several of his apps and oh boy they are GREAT!!!!

### 5/5 — Amazing!

*2023-02-15*

Powerful concept flawlessly executed.

### 5/5 — A must have

*2023-02-07*

Marc Kerstein is by far one of the best ap developers for magic hands down. His aps personally have always been my go to when I’m not carrying anything. ISO is amazing and one of Marc’s top aps in my opinion. Easy to maneuver and the tutorials are very easy to watch with many ideas and effects you can do. This is a must have for any magician

### 5/5 — Sempre magnifici

*2023-02-03*

Una app che stupisce da subito, niente di complicato da eseguire ti permette di creare veri miracoli

### 5/5 — James Bond secret tool

*2023-02-03*

This APP provides you the tools needed to perform MIRACLES (on the spectators phone). 

Powerful, easy to use, and very clever.

## Frequently asked questions about ISO

### What is ISO?

ISO is a digital magic app that allows you to perform various illusions and tricks using a spectator's phone. It enables effects like vanishing bills, book tests, and card forces, making magic accessible and modern.

### Can I use ISO on my own phone?

No, ISO is designed to be performed using the spectator's phone. Your own phone is never in play, adding to the mystery and preventing any suspicion.

### Does ISO work in different languages?

Yes, ISO works in any language. No text is visible during the effect, making it suitable for performances in any country or region.

### What is Serial AR in ISO?

Serial AR is an optional in-app purchase that enhances ISO's capabilities. It removes the need to take a photo in advance for certain bill effects and currently supports GBP, USD, EUR, CAD, and HKD.

### How easy is ISO to perform?

ISO is described as VERY easy to perform. It requires no accomplice and no memory work, making it accessible for a wide range of performers.

### What devices does ISO support?

ISO is supported on iPhone and iPod devices. It is not currently available for Android or other platforms.

### How much does ISO cost?

ISO is a paid application priced at $59.99. There is also an optional in-app purchase for the Serial AR feature.

### How often is ISO updated?

ISO was last updated on June 14, 2023, with version 1.2.3. This indicates a recent update, suggesting ongoing development and support.

## Version history (last 5 releases)

### 1.2.4 — 2026-08-05

- Liquid Glass UI update
- iOS 26 bug fixes
- More currencies added for Serial AR
- Camera more responsive fix

### 1.2.3 — 2023-06-14

- Presets - you can now save/load serials to presets for later use
- More regions added
- Bug fixes

### 1.2.2 — 2023-06-05

- More regions added.
- Diverter integration.
- Bug fixes.

### 1.2.1 — 2023-04-18

Bug fixes for AR tracking

### 1.2 — 2023-04-14

Introducing Serial AR - a new way to use ISO in collaboration with William O'Connell. ISO is now even easier to perform, removing the need to take a photo in advance!

## Apps similar to ISO

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Hypermnesia: Contact Mentalism](https://appshunter.io/ios/app/hypermnesia-contact-mentalism/id6754251036) | 5.0 (2) | Free | Entertainment |
| [AWP Lumen](https://appshunter.io/ios/app/awp-lumen/id6444086658) | 5.0 (9) | Free | Entertainment |
| [L4D](https://appshunter.io/ios/app/l4d/id6470237324) | — | $29.99 | Entertainment |
| [Forecast Pro](https://appshunter.io/ios/app/forecast-pro/id6752625586) | — | $59.99 | Entertainment |
| [Search (Enigma)](https://appshunter.io/ios/app/search-enigma/id6454621122) | 4.3 (11) | Free | Entertainment |
| [Steno - Easiest Book Test Ever](https://appshunter.io/ios/app/steno-easiest-book-test-ever/id6754088592) | — | $14.99 | Entertainment |

## More apps by Marc Kerstein

- [WebFX](https://appshunter.io/ios/app/webfx/id821255613)
- [Earworm](https://appshunter.io/ios/app/earworm/id953365139)
- [Diverter](https://appshunter.io/ios/app/diverter/id1081486684)
- [CardTrack - The Card Tracker](https://appshunter.io/ios/app/cardtrack-the-card-tracker/id1081525380)
- [The Jerx](https://appshunter.io/ios/app/the-jerx/id1082369141)
- [WikiTest](https://appshunter.io/ios/app/wikitest/id1177870786)

All apps by Marc Kerstein: https://appshunter.io/developer/821255617

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-15.*