# Calzy vs ONE

The clearest difference is review sentiment: Calzy at 77% against ONE's 0%. Calzy also leads on update cadence (every 2 days vs every 38 months) and chart position (#48 vs unranked). ONE's advantage is in-app purchases (none vs 3) and iOS requirement (15 vs 26.0). On price, ads, monetization model and device support there is nothing between them.

Calzy costs $1.99 and ONE $1.29 up front. Calzy sells 3 one-off in-app purchases. ONE asks for nothing beyond the download.

Calzy ships an update every 2 days, ONE every 38 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Calzy | ONE |
| --- | --- | --- |
| Price | $1.99 | **$1.29** |
| Rating | **[4.7 (1.9K ratings)](https://appshunter.io/ios/app/calzy/id623690732/reviews)** | — |
| Number of ratings | **1.9K** | — |
| Positive reviews | **76.6% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 38 months |
| Monetization | Paid | Paid |
| Best chart rank | **#48** | — |
| Size | 66 MB | 2 MB |
| Requires iOS | 26.0 | **15** |
| Devices | iPhone, iPad, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Raja Vijayaraman](https://appshunter.io/developer/562575890) | [Zhongshan AppKIS Software Studio (Individually Owned Business)](https://appshunter.io/developer/1542223503) |

## What reviewers say

### Calzy

[App page](https://appshunter.io/ios/app/calzy/id623690732)

**Currently charting:** #48 Top Paid · Productivity (US App Store)

This app offers a modern and intuitive way to perform everyday calculations. It features a unique Memory Area for reusing values, bookmarking for saved calculations, and leverages the latest iOS technologies for a seamless experience. Designed with privacy in mind, it's suitable for students and professionals alike.

**Highlights:** Memory Area for reusing values, Calculation bookmarking with titles, Basic and advanced calculation modes, Privacy mode with Face ID, Live Activity and Haptic Touch support, Customizable keypad layout, Dark and Light modes

**Features:** macOS Compatibility, Apple Watch app, iMessage stickers, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Medium Tip | $3.99 | one-time |
| Huge Tip | $9.99 | one-time |


### ONE

[App page](https://appshunter.io/ios/app/one-make-decisions-faster/id6443902111)

This app uses a digital turntable to help you quickly resolve indecision. Simply set up your options and spin the wheel to get a random choice. It's designed to cure your choice problems and make decisions easier.

**Highlights:** Random choice generator, Customizable options, Sound effects toggle, Intuitive interface, Decision assistance

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Calzy free?

Calzy costs $1.99, and also offers in-app purchases.

### Is ONE free?

ONE costs $1.29, with no in-app purchases.

### Do Calzy or ONE have ads?

Neither Calzy nor ONE shows ads.

### Which is updated more often, Calzy or ONE?

Calzy ships an update every 2 days, and ONE every 38 months. Most recently, Calzy was updated on October 26, 2026 and ONE on October 24, 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.*