# Measurement unit converter + vs Countdown Days

The clearest difference is in-app purchases: Measurement unit converter + at none against Countdown Days's 3. Measurement unit converter + also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Countdown Days sells 3 in-app purchases, starting at $2.99 per 7 days. Measurement unit converter + asks for nothing beyond the download.

Measurement unit converter + ships an update every 9 days, Countdown Days fortnightly. The most recent releases landed on October 4, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Measurement unit converter + | Countdown Days |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 9 days** | Fortnightly |
| Size | 33 MB | 14 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Alexei Ilin](https://appshunter.io/developer/799686570) | [APP TEAM](https://appshunter.io/developer/1892958531) |

## What reviewers say

### Measurement unit converter +

[App page](https://appshunter.io/ios/app/measurement-unit-converter-plus/id6744319878)

**Features:** macOS Compatibility

**In-app purchases:** none


### Countdown Days

[App page](https://appshunter.io/ios/app/countdown-days-event-timer/id6773258156)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $2.99 | per 7 days |
| Monthly | $6.99 | per month |
| Yearly | $39.99 | per year |


## Frequently asked questions

### Is Measurement unit converter + free?

Measurement unit converter + is free to download, with no in-app purchases.

### Is Countdown Days free?

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

### Do Measurement unit converter + or Countdown Days have ads?

Countdown Days shows ads; Measurement unit converter + does not.

### Which is updated more often, Measurement unit converter + or Countdown Days?

Measurement unit converter + ships an update every 9 days, and Countdown Days fortnightly. Most recently, Measurement unit converter + was updated on October 4, 2026 and Countdown Days on October 10, 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.*