# Add Up Fast vs CalendarRef

The clearest difference is rating: CalendarRef at 5.0 against Add Up Fast's 3.7. CalendarRef also leads on in-app purchases (none vs 3). Add Up Fast's advantage is ratings volume (6 vs 1) and iOS requirement (9.0 vs 18.5). On price, ads and device support there is nothing between them.

Both are free to download. Add Up Fast sells 3 one-off in-app purchases. CalendarRef asks for nothing beyond the download.

CalendarRef holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: Add Up Fast has 6 ratings behind it against 1, so its average is the more settled of the two.

## The numbers

| Metric | Add Up Fast | CalendarRef |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (6 ratings)](https://appshunter.io/ios/app/add-up-fast-subtraction-math/id1021120446/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/calendarref/id6749834885/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 40 months | — |
| Monetization | Free with in-app purchases | **Free** |
| Size | 12 MB | 1 MB |
| Requires iOS | **9.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Arch Square](https://appshunter.io/developer/432278777) | [Derrick Braga](https://appshunter.io/developer/1832376581) |

## What reviewers say

### Add Up Fast

[App page](https://appshunter.io/ios/app/add-up-fast-subtraction-math/id1021120446)

Engage in quick math challenges to enhance cognitive abilities. Test your speed and accuracy by selecting the correct answer to equations within a 15-second time limit. The difficulty increases as you progress through multiple game modes.

**Highlights:** 15-second speed challenges, Tap correct answer for equations, Progressively difficult questions, Four game modes: Addition, Subtraction, Multiplication, Division

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pack of 250 Tokens | $0.99 | one-time |
| Pack to Unlock All Game Modes | $1.99 | one-time |
| Pack to Remove Ads | $1.99 | one-time |


### CalendarRef

[App page](https://appshunter.io/ios/app/calendarref/id6749834885)

This app provides a fast, minimalist calendar reference for quickly finding the day of the week for any date. It offers full-year and monthly views with clean layouts, supporting BCE/CE years and accurate historical calendar conversions. It works offline without ads or tracking.

**Highlights:** Full-year view, Monthly layouts, Instant year navigation, BCE/CE year support, Julian/Gregorian calendar handling, Optional date highlights, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Add Up Fast free?

Add Up Fast is free to download, with in-app purchases available.

### Is CalendarRef free?

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

### Which has better reviews, Add Up Fast or CalendarRef?

CalendarRef is rated higher. Add Up Fast averages 3.7 out of 5 from 6 ratings, while CalendarRef averages 5.0 from 1 ratings.

### Do Add Up Fast or CalendarRef have ads?

Neither Add Up Fast nor CalendarRef shows ads.

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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.*