# Sanity Check vs K

Sanity Check and K are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Sanity Check ships an update every 5 weeks, K every 3 weeks. The most recent releases landed on October 6, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Sanity Check | K |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Size | 21 MB | 90 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sanity System Italia S.r.l.](https://appshunter.io/developer/1464607420) | [K-Rev](https://appshunter.io/developer/1298454331) |

## What reviewers say

### Sanity Check

[App page](https://appshunter.io/ios/app/sanity-check/id1629636534)

**In-app purchases:** none


### K

[App page](https://appshunter.io/ios/app/k-rev/id6444311048)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sanity Check free?

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

### Is K free?

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

### Do Sanity Check or K have ads?

Neither Sanity Check nor K shows ads.

### Which is updated more often, Sanity Check or K?

Sanity Check ships an update every 5 weeks, and K every 3 weeks. Most recently, Sanity Check was updated on October 6, 2026 and K 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.*