# Simple Calculator *FLAT calc vs Countdown.

The clearest difference is in-app purchases: Simple Calculator *FLAT calc at none against Countdown.'s 2. Simple Calculator *FLAT calc also leads on device support (3 vs 1) and iOS requirement (11.0 vs 16.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Countdown. sells 2 in-app purchases, starting at $4.99 per 7 days. Simple Calculator *FLAT calc asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 5, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Simple Calculator *FLAT calc | Countdown. |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 10 MB | 4 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Bakerstreet Co., Ltd.](https://appshunter.io/developer/1090599145) | [LEADVISION MEDIA MANAGEMENT LIMITED](https://appshunter.io/developer/1749906380) |

## What reviewers say

### Simple Calculator *FLAT calc

[App page](https://appshunter.io/ios/app/simple-calculator-flat-calc/id1392010421)

**Features:** macOS Compatibility

**In-app purchases:** none


### Countdown.

[App page](https://appshunter.io/ios/app/countdown-event-countdown/id6758510461)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Prime | $4.99 | per 7 days |
| Yearly Prime | $39.99 | per year |


## Frequently asked questions

### Is Simple Calculator *FLAT calc free?

Simple Calculator *FLAT calc is free to download, with no in-app purchases.

### Is Countdown. free?

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

### Do Simple Calculator *FLAT calc or Countdown. have ads?

Neither Simple Calculator *FLAT calc nor Countdown. shows ads.

### Which is updated more often, Simple Calculator *FLAT calc or Countdown.?

Simple Calculator *FLAT calc ships an update every 2 months, and Countdown. every 2 months. Most recently, Simple Calculator *FLAT calc was updated on October 5, 2026 and Countdown. on October 6, 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.*