# Dualock vs Calculator

The clearest difference is price: Calculator at Free against Dualock's $1.99. Calculator also leads on update cadence (fortnightly vs every 4 months). Dualock's advantage is in-app purchases (none vs 3) and iOS requirement (12.0 vs 16.0). On ads and device support there is nothing between them.

Calculator is free to download; Dualock costs $1.99 up front. Calculator sells 3 in-app purchases, starting at $0.99 per month. Dualock asks for nothing beyond the download.

Dualock ships an update every 4 months, Calculator fortnightly. The most recent releases landed on October 3, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Dualock | Calculator |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/dualock-secure-note/id597531505/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 26 MB | 7 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gear Zero Network Inc.](https://appshunter.io/developer/1081762357) | [深圳宝乐软件有限公司](https://appshunter.io/developer/1773102040) |

## What reviewers say

### 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


### Calculator

[App page](https://appshunter.io/ios/app/calculator-edit-equations/id6443911558)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1个月 | $0.99 | per month |
| 1 年 | $1.99 | per year |
| 终身会员 | $2.99 | one-time |


## Frequently asked questions

### Is Dualock free?

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

### Is Calculator free?

Calculator is free to download, with in-app purchases available.

### Do Dualock or Calculator have ads?

Neither Dualock nor Calculator shows ads.

### Which is updated more often, Dualock or Calculator?

Dualock ships an update every 4 months, and Calculator fortnightly. Most recently, Dualock was updated on October 3, 2026 and Calculator on October 13, 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.*