ISO - Kerstein & Qualter
Not in any tracked top chart right now.
Updated 19 Oct 2026 · rankings refresh through the day
DeveloperMarc Kerstein
CategoryEntertainment
Price59.99 GBP
Released
Rating★ 5.0 (4)
Version1.2.4
Age rating4+
First seen by us
12 Oct 2026
Installs (est.)1k+ worldwide
Rating
5.0 ★
4 ratings
Measured
ISO - Kerstein & Qualter on the App Store
App details
App ID
1662170624
Publisher
Marc Kerstein
On the store since
Feb 2023
3 years on the store
Minimum OS
iOS 17.6+
iPhone XS and later
Devices
iPhone · iPad
Content rating
4+
Languages
1
EN
Size
19 MB
ISO - Kerstein & Qualter downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. iPhone downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
5.0 ★
4 ratings
Measured
Ratings
4
Measured
About ISO - Kerstein & Qualter
“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.
—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.
Latest updates
1.2.4
- Liquid Glass UI update
- iOS 26 bug fixes
- More currencies added for Serial AR
- Camera more responsive fix