# Nexus universal calculator vs Countdown 321

The clearest difference is ads: Countdown 321 at none against Nexus universal calculator's shown. Nexus universal calculator's advantage is update cadence (weekly vs every 3 months) and rating (5.0 vs 4.6). On price, ratings volume, in-app purchases and monetization model there is nothing between them.

Both are free to download. Nexus universal calculator sells 3 in-app purchases, starting at $2.99 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.

Nexus universal calculator holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 7 and 8 respectively.

Nexus universal calculator ships an update weekly, Countdown 321 every 3 months. The most recent releases landed on June 1, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Nexus universal calculator | Countdown 321 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/nexus-universal-calculator/id6746715232/reviews)** | [4.6 (8 ratings)](https://appshunter.io/ios/app/countdown-321-widget/id6749746114/reviews) |
| Number of ratings | 7 | **8** |
| Positive reviews | — | 95.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 3 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 67 MB | 6 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nataliia Vereshchak](https://appshunter.io/developer/1818074298) | [帆 邱](https://appshunter.io/developer/1766624521) |

## What reviewers say

### Nexus universal calculator

[App page](https://appshunter.io/ios/app/nexus-universal-calculator/id6746715232)

A smart calculator that remembers your calculations, allows you to reuse results in new formulas, and includes unit and currency conversion. It offers cloud sync for seamless access across devices and a clean design for everyday use, budgeting, and studying.

**Highlights:** Calculator with history, Smart formula builder, Unit and currency converter, Cloud sync across devices, Clean and simple design, Reuse past results as variables

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Month | $2.99 | per month |
| Premium year | $9.99 | per year |
| Lifetime Premium Features | $199.00 | 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 Nexus universal calculator free?

Nexus universal calculator 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, Nexus universal calculator or Countdown 321?

Nexus universal calculator is rated higher. Nexus universal calculator averages 5.0 out of 5 from 7 ratings, while Countdown 321 averages 4.6 from 8 ratings.

### Do Nexus universal calculator or Countdown 321 have ads?

Nexus universal calculator shows ads; Countdown 321 does not.

### Which is updated more often, Nexus universal calculator or Countdown 321?

Nexus universal calculator ships an update weekly, and Countdown 321 every 3 months. Most recently, Nexus universal calculator was updated on June 1, 2026 and Countdown 321 on September 25, 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.*