# Numerical³ vs Promise

The clearest difference is in-app purchases: Numerical³ at none against Promise's 2. Numerical³ also leads on device support (3 vs 1) and iOS requirement (18.0 vs 26.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Promise sells 2 in-app purchases, starting at $2.99 per month. Numerical³ asks for nothing beyond the download.

Numerical³ ships an update every 2 weeks, Promise every 3 weeks. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Numerical³ | Promise |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (1.3K ratings)](https://appshunter.io/ios/app/numerical/id804548449/reviews)** | — |
| Number of ratings | **1.3K** | — |
| Positive reviews | 74.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Paid | — |
| Size | 175 MB | 54 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Andrew J Clark](https://appshunter.io/developer/804548452) | [Eslam Elsadawy](https://appshunter.io/developer/1883148394) |

## What reviewers say

### Numerical³

[App page](https://appshunter.io/ios/app/numerical/id804548449)

A powerful and beautifully designed calculator app that offers advanced scientific functions, automatic bracket handling, and a unique no-equals button interface. It integrates seamlessly with iOS features like widgets and keyboards for calculations anywhere.

**Highlights:** No equals button interface, Automatic bracket handling, Full scientific keypad, Today Widget integration, Numerical² Keyboard for any app, Equation editing, Customizable themes

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases:** none

**What reviewers like**

- 🚀 Great app
- 👍 Simple and intuitive
- 👍 Clean and beautiful design
- 🚀 Fast and responsive
- 👍 Customizable themes

**What reviewers complain about**

- 🐛 Bugs and glitches (unresponsive keys, calculation errors)
- 🔍 Lack of advanced functions (scientific, unit conversion)
- 💡 Needs more theme options
- 💡 Needs iPad support
- 💡 Needs widget support

**Reported bugs**

- Unresponsive keys
- Calculation errors
- Crashes on startup

**Requested features**

- Add scientific functions (square root, trigonometry, etc.)
- Implement an equals button
- Add more theme options
- Develop an iPad version
- Bring back widget support


### Promise

[App page](https://appshunter.io/ios/app/promise-alarm-clock/id6796714697)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Promise Alarm Pro Monthly | $2.99 | per month |
| Promise Alarm Pro Yearly | $9.99 | per year |


## Frequently asked questions

### Is Numerical³ free?

Numerical³ is free to download, with no in-app purchases.

### Is Promise free?

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

### Do Numerical³ or Promise have ads?

Neither Numerical³ nor Promise shows ads.

### Which is updated more often, Numerical³ or Promise?

Numerical³ ships an update every 2 weeks, and Promise every 3 weeks. Most recently, Numerical³ was updated on October 30, 2026 and Promise on October 25, 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.*