# Simple Calculator *FLAT calc vs Birthday Countdown

The clearest difference is in-app purchases: Simple Calculator *FLAT calc at none against Birthday Countdown's 2. Simple Calculator *FLAT calc also leads on iOS requirement (11.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Birthday Countdown sells 2 in-app purchases, starting at $0.99 per 7 days. Simple Calculator *FLAT calc asks for nothing beyond the download.

Simple Calculator *FLAT calc ships an update every 2 months, Birthday Countdown every 3 months. The most recent releases landed on October 5, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Simple Calculator *FLAT calc | Birthday Countdown |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/birthday-countdown-reminders/id6753961649/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | — | Freemium |
| Size | 10 MB | 35 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 9+ |
| Developer | [Bakerstreet Co., Ltd.](https://appshunter.io/developer/1090599145) | [Dzmitry Tratsiak](https://appshunter.io/developer/1800457025) |

## 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


### Birthday Countdown

[App page](https://appshunter.io/ios/app/birthday-countdown-reminders/id6753961649)

Never forget a birthday again with this app. It helps you organize, remember, and celebrate important moments with smart alerts and customizable widgets for your home and lock screens. Stay thoughtful and connected with timely reminders for all your loved ones' special days.

**Highlights:** Birthday tracking and reminders, Customizable home and lock screen widgets, Smart alerts and notifications, Birthday list view, Calendar integration, Countdown timers

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (1 week) | $0.99 | per 7 days |
| Premium (1 month) | $2.99 | per month |


## Frequently asked questions

### Is Simple Calculator *FLAT calc free?

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

### Is Birthday Countdown free?

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

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

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

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

Simple Calculator *FLAT calc ships an update every 2 months, and Birthday Countdown every 3 months. Most recently, Simple Calculator *FLAT calc was updated on October 5, 2026 and Birthday Countdown on October 24, 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.*