# CalcKey vs Countdown 321

The clearest difference is review sentiment: Countdown 321 at 95% against CalcKey's 0%. Countdown 321 also leads on rating (4.6 vs 3.8). CalcKey's advantage is update cadence (every 3 weeks vs every 3 months) and iOS requirement (15 vs 17.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. CalcKey sells 2 in-app purchases, starting at $3.99 per month and Countdown 321 sells 2 in-app purchases, starting at $1.99 per year. Whichever you choose, the download price is not the number that matters.

Countdown 321 holds the better App Store score, 4.6 against 3.8. Both are backed by a comparable volume of ratings — 8 and 8 respectively. Written reviews point the same way: 0% of CalcKey's written reviews are positive against 95% of Countdown 321's.

CalcKey ships an update every 3 weeks, Countdown 321 every 3 months. The most recent releases landed on September 9, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | CalcKey | Countdown 321 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (8 ratings)](https://appshunter.io/ios/app/calckey-calculator-keyboard/id6748647909/reviews) | **[4.6 (8 ratings)](https://appshunter.io/ios/app/countdown-321-widget/id6749746114/reviews)** |
| Number of ratings | 8 | 8 |
| Positive reviews | 0.0% of reviews | **95.2% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 14 MB | 5 MB |
| Requires iOS | **15** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Right Tracks IT Limited](https://appshunter.io/developer/1803615116) | [帆 邱](https://appshunter.io/developer/1766624521) |

## What reviewers say

### CalcKey

[App page](https://appshunter.io/ios/app/calckey-calculator-keyboard/id6748647909)

Perform calculations directly within any app using a smart keyboard extension. Get instant results for basic and scientific equations, with a history of your calculations. Enjoy a seamless typing experience and smart formatting.

**Highlights:** Keyboard calculator extension, Real-time results, Basic & scientific calculators, Calculation history, Smart formatting, Standalone app option

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CalcKey Pro Monthly | $3.99 | per month |
| One time purchase | $19.99 | one-time |


### Countdown 321

[App page](https://appshunter.io/ios/app/countdown-321-widget/id6749746114)

Easily track important upcoming events and past milestones with a clean, minimalist interface. Get instant updates via home screen widgets and sync your data across devices with iCloud. Never forget a special day again.

**Highlights:** Countdown and count-up days, Reminders and notifications, Life calendar visualization, Timeline view, Minimalist design, Home screen widgets, iCloud sync

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CountdownPro | $1.99 | per year |
| Lifetime Pro | $0.99 | one-time |


## Frequently asked questions

### Is CalcKey free?

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

### Is Countdown 321 free?

Countdown 321 is free to download, with in-app purchases available.

### Which has better reviews, CalcKey or Countdown 321?

Countdown 321 is rated higher. CalcKey averages 3.8 out of 5 from 8 ratings, while Countdown 321 averages 4.6 from 8 ratings.

### Do CalcKey or Countdown 321 have ads?

Neither CalcKey nor Countdown 321 shows ads.

### Which is updated more often, CalcKey or Countdown 321?

CalcKey ships an update every 3 weeks, and Countdown 321 every 3 months. Most recently, CalcKey was updated on September 9, 2026 and Countdown 321 on September 20, 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.*