# Formalize Light vs Calculator Keyboard

The clearest difference is review sentiment: Calculator Keyboard at 77% against Formalize Light's 17%. Calculator Keyboard also leads on rating (4.7 vs 2.3) and update cadence (every 3 weeks vs every 12 months). Formalize Light's advantage is in-app purchases (none vs 2) and iOS requirement (10.3 vs 14.0). On price, ads and device support there is nothing between them.

Both are free to download. Calculator Keyboard sells 2 in-app purchases, starting at $0.99 per month. Formalize Light asks for nothing beyond the download.

Calculator Keyboard holds the better App Store score, 4.7 against 2.3. That said, the two scores are not equally well evidenced: Calculator Keyboard has 493 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 17% of Formalize Light's written reviews are positive against 77% of Calculator Keyboard's.

Formalize Light ships an update every 12 months, Calculator Keyboard every 3 weeks. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Formalize Light | Calculator Keyboard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (4 ratings)](https://appshunter.io/ios/app/formalize-light/id1467203618/reviews) | **[4.7 (493 ratings)](https://appshunter.io/ios/app/calculator-keyboard-calku/id1546065778/reviews)** |
| Number of ratings | 4 | **493** |
| Positive reviews | 16.7% of reviews | **76.8% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 62 MB | 3 MB |
| Requires iOS | **10.3** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ben Hambrecht](https://appshunter.io/developer/1035136614) | [Supagarn Pattananuchart](https://appshunter.io/developer/1488328374) |

## What reviewers say

### Formalize Light

[App page](https://appshunter.io/ios/app/formalize-light/id1467203618)

This utility app provides a keyboard extension for typing mathematical formulas on iOS devices. It offers easy access to over 100 symbols and generates professionally typeset equations that can be converted to TeX.

**Highlights:** Mathematical keyboard extension, Over 100 symbols, One-handed access, Professionally typeset formulas, Convert formulas to TeX, Insert formulas into any app

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

**In-app purchases:** none


### Calculator Keyboard

[App page](https://appshunter.io/ios/app/calculator-keyboard-calku/id1546065778)

This app turns your keyboard into a powerful calculator, allowing you to perform calculations directly within any application. Avoid switching apps and copying numbers by calculating on the go, whether you're texting, taking notes, or browsing.

**Highlights:** Calculate within any app, Supports Dark Mode, Customizable decimal points, Scientific calculator functions, Calculation history access, Keyboard feedback options

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calku PRO (1 Month) | $0.99 | per month |
| Calku Pro - Lifetime | $5.99 | one-time |

**What reviewers like**

- 👍 Very useful application
- 🚀 Handy calculator within keyboard
- 💡 Innovative idea for an app
- 👍 Easy to use
- 🔒 Respects user privacy

**What reviewers complain about**

- 🐛 Cannot delete the app
- 🐛 Buggy at times
- 🐛 Non-standard division/multiplication symbols
- 🐛 Incorrect calculations
- 🐛 Doesn't work on all apps initially

**Reported bugs**

- Cannot delete the app
- App is buggy sometimes
- Non-standard division and multiplication symbols not recognized by other apps
- Incorrect calculations (e.g., 3.10 / 1000 = 0)
- App only works on Apple Mail and Notes initially

**Requested features**

- Add thousands separator for numbers
- Haptic feedback on key presses
- Option to hide computation in text box
- History button on main page
- Option for standard multiplication and division


## Frequently asked questions

### Is Formalize Light free?

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

### Is Calculator Keyboard free?

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

### Which has better reviews, Formalize Light or Calculator Keyboard?

Calculator Keyboard is rated higher. Formalize Light averages 2.3 out of 5 from 4 ratings, while Calculator Keyboard averages 4.7 from 493 ratings.

### Do Formalize Light or Calculator Keyboard have ads?

Neither Formalize Light nor Calculator Keyboard shows ads.

### Which is updated more often, Formalize Light or Calculator Keyboard?

Formalize Light ships an update every 12 months, and Calculator Keyboard every 3 weeks. Most recently, Formalize Light was updated on October 24, 2026 and Calculator Keyboard on October 29, 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.*