# Engineering Calculator vs Countdown Widget & Days

The clearest difference is rating: Engineering Calculator at 4.5 against Countdown Widget & Days's 4.0. Engineering Calculator also leads on in-app purchases (none vs 1) and device support (3 vs 1). Countdown Widget & Days's advantage is ads (none vs shown) and update cadence (every 2 weeks vs monthly). On price there is nothing between them.

Both are free to download. Countdown Widget & Days sells 1 one-off in-app purchase. Engineering Calculator asks for nothing beyond the download.

Engineering Calculator holds the better App Store score, 4.5 against 4.0. Both are backed by a comparable volume of ratings — 2 and 7 respectively.

Engineering Calculator ships an update monthly, Countdown Widget & Days every 2 weeks. The most recent releases landed on September 23, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Engineering Calculator | Countdown Widget & Days |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/engineering-calculator/id1395510375/reviews)** | [4.0 (7 ratings)](https://appshunter.io/ios/app/countdown-widget-and-days/id6450153688/reviews) |
| Number of ratings | 2 | **7** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | **Ad-supported** | Freemium |
| Size | 1 MB | 41 MB |
| Requires iOS | **12.2** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Masato Kanazawa](https://appshunter.io/developer/1110570349) | [Costhap](https://appshunter.io/developer/1690822307) |

## What reviewers say

### Engineering Calculator

[App page](https://appshunter.io/ios/app/engineering-calculator/id1395510375)

This utility app helps users convert units and calculate tips, primarily for those in the US. It operates offline and aims for minimal user interaction to provide quick results. Useful for avoiding misunderstandings in business dealings due to unit differences.

**Highlights:** Unit conversion, Tip calculation, Offline functionality, Minimalist interface, Business negotiation aid

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

**In-app purchases:** none


### Countdown Widget & Days

[App page](https://appshunter.io/ios/app/countdown-widget-and-days/id6450153688)

This app helps you visualize time to upcoming events or track time since past milestones. Customize countdowns with personalized backgrounds and add them as widgets to your Home and Lock Screen. Receive smart reminders for approaching dates and share your countdowns with others.

**Highlights:** Countdown and count-up timers, Customizable Home and Lock Screen widgets, Personalized backgrounds and themes, Smart event reminders, Easy countdown sharing, Ad-free experience

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Unlock | $1.99 | one-time |


## Frequently asked questions

### Is Engineering Calculator free?

Engineering Calculator is free to download, with no in-app purchases.

### Is Countdown Widget & Days free?

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

### Which has better reviews, Engineering Calculator or Countdown Widget & Days?

Engineering Calculator is rated higher. Engineering Calculator averages 4.5 out of 5 from 2 ratings, while Countdown Widget & Days averages 4.0 from 7 ratings.

### Do Engineering Calculator or Countdown Widget & Days have ads?

Engineering Calculator shows ads; Countdown Widget & Days does not.

### Which is updated more often, Engineering Calculator or Countdown Widget & Days?

Engineering Calculator ships an update monthly, and Countdown Widget & Days every 2 weeks. Most recently, Engineering Calculator was updated on September 23, 2026 and Countdown Widget & Days on October 4, 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.*