# Kardio vs uFlash

The clearest difference is in-app purchases: Kardio at none against uFlash's 4. Kardio also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. uFlash sells 4 one-off in-app purchases. Kardio asks for nothing beyond the download.

Both ship on a similar rhythm, roughly weekly. Both last shipped on November 5, 2026.

## The numbers

| Metric | Kardio | uFlash |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/uflash/id6788580810/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Size | 40 MB | 7 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [John Cooper](https://appshunter.io/developer/1839993437) | [Aaron Fenker](https://appshunter.io/developer/6788580812) |

## What reviewers say

### Kardio

[App page](https://appshunter.io/ios/app/kardio-ai-flashcards/id6761866878)

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

**In-app purchases:** none


### uFlash

[App page](https://appshunter.io/ios/app/uflash/id6788580810)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Donut Tip | $1.99 | one-time |
| Beer Tip | $4.99 | one-time |
| uFlash Pro | $9.99 | one-time |
| Burger Tip | $9.99 | one-time |


## Frequently asked questions

### Is Kardio free?

Kardio is free to download, with no in-app purchases.

### Is uFlash free?

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

### Do Kardio or uFlash have ads?

Neither Kardio nor uFlash shows ads.

### Which is updated more often, Kardio or uFlash?

Kardio ships an update weekly, and uFlash weekly. Most recently, Kardio was updated on November 5, 2026 and uFlash on November 5, 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.*