# Scientific CalcX vs CardsFlash

The clearest difference is price: CardsFlash at Free against Scientific CalcX's $1.99. CardsFlash also leads on update cadence (every 5 weeks vs every 8 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

CardsFlash is free to download; Scientific CalcX costs $1.99 up front. Scientific CalcX sells 1 one-off in-app purchase and CardsFlash sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Scientific CalcX ships an update every 8 months, CardsFlash every 5 weeks. The most recent releases landed on October 12, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Scientific CalcX | CardsFlash |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 5 weeks** |
| Size | 2 MB | 1 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hangzhou Lake Snow Technology Co., Ltd.](https://appshunter.io/developer/1439688130) | [Michael Steurer](https://appshunter.io/developer/984557127) |

## What reviewers say

### Scientific CalcX

[App page](https://appshunter.io/ios/app/scientific-calcx/id1439688401)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scientific CalcX Premium | $3.99 | one-time |


### CardsFlash

[App page](https://appshunter.io/ios/app/cardsflash-flashcards-learn/id1591831530)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Espresso | $0.99 | one-time |
| Cappuccino | $2.99 | one-time |
| Single Origin Aeropress | $5.99 | one-time |


## Frequently asked questions

### Is Scientific CalcX free?

Scientific CalcX costs $1.99, and also offers in-app purchases.

### Is CardsFlash free?

CardsFlash is free to download, with in-app purchases available.

### Do Scientific CalcX or CardsFlash have ads?

Neither Scientific CalcX nor CardsFlash shows ads.

### Which is updated more often, Scientific CalcX or CardsFlash?

Scientific CalcX ships an update every 8 months, and CardsFlash every 5 weeks. Most recently, Scientific CalcX was updated on October 12, 2026 and CardsFlash on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*