# MarsBMS vs KeepKnow

The clearest difference is update cadence: MarsBMS at daily against KeepKnow's every 3 months. 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.

MarsBMS ships an update daily, KeepKnow every 3 months. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | MarsBMS | KeepKnow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Daily** | Every 3 months |
| Size | 52 MB | 48 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [卓文 梁](https://appshunter.io/developer/1759304348) | [KeepKnow New Energy Limited](https://appshunter.io/developer/1893814746) |

## What reviewers say

### MarsBMS

[App page](https://appshunter.io/ios/app/marsbms/id6758932685)

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

**In-app purchases:** none


### KeepKnow

[App page](https://appshunter.io/ios/app/keepknow/id6762320766)

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

**In-app purchases:** none


## Frequently asked questions

### Is MarsBMS free?

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

### Is KeepKnow free?

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

### Do MarsBMS or KeepKnow have ads?

Neither MarsBMS nor KeepKnow shows ads.

### Which is updated more often, MarsBMS or KeepKnow?

MarsBMS ships an update daily, and KeepKnow every 3 months. Most recently, MarsBMS was updated on October 31, 2026 and KeepKnow 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.*