# Between Dates Calendar Math vs ErgoMine

The clearest difference is price: ErgoMine at Free against Between Dates Calendar Math's $0.99. ErgoMine also leads on iOS requirement (9.0 vs 13.0). Between Dates Calendar Math's advantage is rating (4.8 vs 3.0) and update cadence (every 4 months vs every 16 months). On ads, in-app purchases and device support there is nothing between them.

ErgoMine is free to download; Between Dates Calendar Math costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Between Dates Calendar Math holds the better App Store score, 4.8 against 3.0. That said, the two scores are not equally well evidenced: Between Dates Calendar Math has 42 ratings behind it against 2, so its average is the more settled of the two.

Between Dates Calendar Math ships an update every 4 months, ErgoMine every 16 months. The most recent releases landed on October 6, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Between Dates Calendar Math | ErgoMine |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.8 (42 ratings)](https://appshunter.io/ios/app/between-dates-calendar-math/id442169104/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/ergomine/id1462900177/reviews) |
| Number of ratings | **42** | 2 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 16 months |
| Monetization | Paid | **Free** |
| Size | 1 MB | 151 MB |
| Requires iOS | 13.0 | **9.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | +4 |
| Developer | [Ducky Planet LLC](https://appshunter.io/developer/442169107) | [Centers For Disease Control and Prevention](https://appshunter.io/developer/439259253) |

## What reviewers say

### Between Dates Calendar Math

[App page](https://appshunter.io/ios/app/between-dates-calendar-math/id442169104)

Calculate the number of days between two dates with a simple interface. Save, recall, sort, and remove date calculations. Add or subtract days from selected dates for quick date projections.

**Highlights:** Calculate days between dates, Save and recall date calculations, Sort and remove saved dates, Add or subtract days, Copy dates to start/end, Reset dates to current

**Features:** Vision Pro support

**In-app purchases:** none


### ErgoMine

[App page](https://appshunter.io/ios/app/ergomine/id1462900177)

This app helps mining companies conduct ergonomics audits for various operations. It uses questionnaires to identify workplace deficiencies and provides recommendations and resources for improvement. Developed by researchers, it's designed for safety personnel without requiring ergonomics expertise.

**Highlights:** Ergonomics audits for bagging, maintenance, and haul trucks, Focus on injury prevention, Questionnaire-based evaluation, Provides recommendations and resources, Developed by occupational safety researchers, No ergonomics expertise required

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

**In-app purchases:** none


## Frequently asked questions

### Is Between Dates Calendar Math free?

Between Dates Calendar Math costs $0.99, with no in-app purchases.

### Is ErgoMine free?

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

### Which has better reviews, Between Dates Calendar Math or ErgoMine?

Between Dates Calendar Math is rated higher. Between Dates Calendar Math averages 4.8 out of 5 from 42 ratings, while ErgoMine averages 3.0 from 2 ratings.

### Do Between Dates Calendar Math or ErgoMine have ads?

Neither Between Dates Calendar Math nor ErgoMine shows ads.

### Which is updated more often, Between Dates Calendar Math or ErgoMine?

Between Dates Calendar Math ships an update every 4 months, and ErgoMine every 16 months. Most recently, Between Dates Calendar Math was updated on October 6, 2026 and ErgoMine on October 7, 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.*