# Dualock vs Percentage Calc

The clearest difference is price: Percentage Calc at Free against Dualock's $1.99. Percentage Calc also leads on update cadence (monthly vs every 4 months) and ratings volume (3 vs 1). Dualock's advantage is rating (5.0 vs 3.7) and in-app purchases (none vs 4). On ads and device support there is nothing between them.

Percentage Calc is free to download; Dualock costs $1.99 up front. Percentage Calc sells 4 in-app purchases, starting at $1.99 per 7 days. Dualock asks for nothing beyond the download.

Dualock holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

Dualock ships an update every 4 months, Percentage Calc monthly. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Dualock | Percentage Calc |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/dualock-secure-note/id597531505/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/percentage-calc-calculator/id6450499183/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | — | 60.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 26 MB | 4 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Gear Zero Network Inc.](https://appshunter.io/developer/1081762357) | [Ottorino Bruni](https://appshunter.io/developer/360574946) |

## 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


### Percentage Calc

[App page](https://appshunter.io/ios/app/percentage-calc-calculator/id6450499183)

Effortlessly calculate discounts, taxes, tips, and investment returns with this intuitive percentage calculator. Get instant, accurate results for shopping, finances, and studies. Offers a private and secure experience without data tracking.

**Highlights:** Percentage calculation, Discount and tax calculation, Tip calculation, ROI and CAGR analysis, Fraction to percentage conversion, History and save functionality, iCloud sync

**Features:** Family Sharing, iPhone Duo support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Week | $1.99 | per 7 days |
| 1 Month | $3.99 | per month |
| 1 Year | $12.99 | per year |
| Forever | $22.99 | one-time |


## Frequently asked questions

### Is Dualock free?

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

### Is Percentage Calc free?

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

### Which has better reviews, Dualock or Percentage Calc?

Dualock is rated higher. Dualock averages 5.0 out of 5 from 1 ratings, while Percentage Calc averages 3.7 from 3 ratings.

### Do Dualock or Percentage Calc have ads?

Neither Dualock nor Percentage Calc shows ads.

### Which is updated more often, Dualock or Percentage Calc?

Dualock ships an update every 4 months, and Percentage Calc monthly. Most recently, Dualock was updated on November 1, 2026 and Percentage Calc on November 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.*