# K2 Sathi vs MarkChem

The clearest difference is update cadence: MarkChem at every 3 weeks against K2 Sathi's every 18 months. K2 Sathi's advantage is iOS requirement (12.1 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

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

K2 Sathi ships an update every 18 months, MarkChem every 3 weeks. The most recent releases landed on September 17, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | K2 Sathi | MarkChem |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 3 weeks** |
| Size | 12 MB | 36 MB |
| Requires iOS | **12.1** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Nikhil Patel](https://appshunter.io/developer/1142926286) | [Shobhit Gupta](https://appshunter.io/developer/1532902469) |

## What reviewers say

### K2 Sathi

[App page](https://appshunter.io/ios/app/k2-sathi/id1480566184)

**Features:** macOS Compatibility

**In-app purchases:** none


### MarkChem

[App page](https://appshunter.io/ios/app/markchem/id1532902467)

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

**In-app purchases:** none


## Frequently asked questions

### Is K2 Sathi free?

K2 Sathi is free to download, with no in-app purchases.

### Is MarkChem free?

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

### Do K2 Sathi or MarkChem have ads?

Neither K2 Sathi nor MarkChem shows ads.

### Which is updated more often, K2 Sathi or MarkChem?

K2 Sathi ships an update every 18 months, and MarkChem every 3 weeks. Most recently, K2 Sathi was updated on September 17, 2026 and MarkChem on September 8, 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.*