# C vs Promiso

The clearest difference is in-app purchases: C at none against Promiso's 3. C also leads on ads (none vs shown). Promiso's advantage is update cadence (every 11 days vs every 4 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Promiso sells 3 in-app purchases, starting at $3.99 per month. C asks for nothing beyond the download.

C ships an update every 4 months, Promiso every 11 days. The most recent releases landed on November 13, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | C | Promiso |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 11 days** |
| Size | 33 MB | 46 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [CASIO COMPUTER CO., LTD.](https://appshunter.io/developer/456569836) | [GOKHAN HEPSEN](https://appshunter.io/developer/1863241015) |

## What reviewers say

### C

[App page](https://appshunter.io/ios/app/c-mirroring/id6464287342)

**In-app purchases:** none


### Promiso

[App page](https://appshunter.io/ios/app/promiso/id6756845679)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $3.99 | per month |
| Premium Yearly | $24.99 | per year |
| Lifetime Premium | $29.99 | one-time |


## Frequently asked questions

### Is C free?

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

### Is Promiso free?

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

### Do C or Promiso have ads?

Promiso shows ads; C does not.

### Which is updated more often, C or Promiso?

C ships an update every 4 months, and Promiso every 11 days. Most recently, C was updated on November 13, 2026 and Promiso on November 9, 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.*