# Halcyon Calc vs Dualock

The clearest difference is ratings volume: Halcyon Calc at 18 against Dualock's 1. Dualock's advantage is price ($1.99 vs $4.99) and iOS requirement (12.0 vs 16.6). On rating, update cadence, ads and in-app purchases there is nothing between them.

Halcyon Calc costs $4.99 and Dualock $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Halcyon Calc against 5.0 for Dualock. That said, the two scores are not equally well evidenced: Halcyon Calc has 18 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 November 6, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Halcyon Calc | Dualock |
| --- | --- | --- |
| Price | $4.99 | **$1.99** |
| Rating | [4.9 (18 ratings)](https://appshunter.io/ios/app/halcyon-calc/id327064659/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/dualock-secure-note/id597531505/reviews)** |
| Number of ratings | **18** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Paid | Paid |
| Size | 10 MB | 26 MB |
| Requires iOS | 16.6 | **12.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Halcyon Touch Software](https://appshunter.io/developer/327064662) | [Gear Zero Network Inc.](https://appshunter.io/developer/1081762357) |

## What reviewers say

### Halcyon Calc

[App page](https://appshunter.io/ios/app/halcyon-calc/id327064659)

A powerful calculator app for students, engineers, and scientists. It handles complex numbers, symbolic expressions, unit conversions, and matrix operations, with advanced plotting and programming capabilities.

**Highlights:** Complex number calculations, Symbolic expression manipulation, Unit conversion with custom units, Matrix and vector operations, Symbolic plotting, Programming of custom operations, Statistical data analysis

**Features:** macOS Compatibility, 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 Halcyon Calc free?

Halcyon Calc costs $4.99, with no in-app purchases.

### Is Dualock free?

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

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

Dualock is rated higher. Halcyon Calc averages 4.9 out of 5 from 18 ratings, while Dualock averages 5.0 from 1 ratings.

### Do Halcyon Calc or Dualock have ads?

Neither Halcyon Calc nor Dualock shows ads.

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

Halcyon Calc ships an update every 4 months, and Dualock every 4 months. Most recently, Halcyon Calc was updated on November 6, 2026 and Dualock on November 1, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*