# Between Dates Calendar Math vs Dualock

The clearest difference is ratings volume: Between Dates Calendar Math at 42 against Dualock's 1. Between Dates Calendar Math also leads on device support (4 vs 2) and price ($0.99 vs $1.99). Dualock's advantage is rating (5.0 vs 4.8). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

Between Dates Calendar Math costs $0.99 and Dualock $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Dualock holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Between Dates Calendar Math has 42 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 23, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Between Dates Calendar Math | Dualock |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Rating | [4.8 (42 ratings)](https://appshunter.io/ios/app/between-dates-calendar-math/id442169104/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/dualock-secure-note/id597531505/reviews)** |
| Number of ratings | **42** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Paid | Paid |
| Size | 1 MB | 26 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ducky Planet LLC](https://appshunter.io/developer/442169107) | [Gear Zero Network Inc.](https://appshunter.io/developer/1081762357) |

## 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


### Dualock

[App page](https://appshunter.io/ios/app/dualock-secure-note/id597531505)

This app securely stores your notes by splitting them into two encrypted parts, stored separately. Access requires authentication from two specified SNS accounts, ensuring your data remains private and inaccessible to others.

**Highlights:** Two-part encrypted note storage, Separate cloud storage for each part, Dual SNS account authentication, No password required, Secure and private data handling

**Features:** macOS Compatibility

**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 Dualock free?

Dualock costs $1.99, with no in-app purchases.

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

Dualock is rated higher. Between Dates Calendar Math averages 4.8 out of 5 from 42 ratings, while Dualock averages 5.0 from 1 ratings.

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

Neither Between Dates Calendar Math nor Dualock shows ads.

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

Between Dates Calendar Math ships an update every 4 months, and Dualock every 4 months. Most recently, Between Dates Calendar Math was updated on October 23, 2026 and Dualock on October 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.*