# CnR M.A.R.S. vs Sum

The clearest difference is in-app purchases: CnR M.A.R.S. at none against Sum's 2. CnR M.A.R.S. also leads on iOS requirement (11.0 vs 13.0). Sum's advantage is update cadence (every 5 days vs every 38 months). On price, ads and device support there is nothing between them.

Both are free to download. Sum sells 2 in-app purchases, starting at $4.99 per month. CnR M.A.R.S. asks for nothing beyond the download.

CnR M.A.R.S. ships an update every 38 months, Sum every 5 days. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | CnR M.A.R.S. | Sum |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 5 days** |
| Size | 17 MB | 32 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Allerup.Com AS](https://appshunter.io/developer/1465876722) | [Aprilred SRL](https://appshunter.io/developer/1057855420) |

## What reviewers say

### CnR M.A.R.S.

[App page](https://appshunter.io/ios/app/cnr-mars/id1243473878)

**In-app purchases:** none


### Sum

[App page](https://appshunter.io/ios/app/sum-up/id6753583350)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium Subscription | $4.99 | per month |
| Yearly Premium Subscription | $35.99 | per year |


## Frequently asked questions

### Is CnR M.A.R.S. free?

CnR M.A.R.S. is free to download, with no in-app purchases.

### Is Sum free?

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

### Do CnR M.A.R.S. or Sum have ads?

Neither CnR M.A.R.S. nor Sum shows ads.

### Which is updated more often, CnR M.A.R.S. or Sum?

CnR M.A.R.S. ships an update every 38 months, and Sum every 5 days. Most recently, CnR M.A.R.S. was updated on October 29, 2026 and Sum on October 28, 2026.

---

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