# Calculator Keyboard vs Penlight.

The clearest difference is price: Calculator Keyboard at Free against Penlight.'s $1.99. Calculator Keyboard also leads on ratings volume (493 vs 1) and device support (3 vs 1). Penlight.'s advantage is in-app purchases (none vs 2) and update cadence (daily vs every 3 weeks). On ads there is nothing between them.

Calculator Keyboard is free to download; Penlight. costs $1.99 up front. Calculator Keyboard sells 2 in-app purchases, starting at $0.99 per month. Penlight. asks for nothing beyond the download.

Penlight. holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Calculator Keyboard has 493 ratings behind it against 1, so its average is the more settled of the two.

Calculator Keyboard ships an update every 3 weeks, Penlight. daily. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Calculator Keyboard | Penlight. |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [4.7 (493 ratings)](https://appshunter.io/ios/app/calculator-keyboard-calku/id1546065778/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/penlight/id6621271103/reviews)** |
| Number of ratings | **493** | 1 |
| Positive reviews | 76.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 3 MB | 1 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Supagarn Pattananuchart](https://appshunter.io/developer/1488328374) | [My Call Bag LLC](https://appshunter.io/developer/1243282862) |

## What reviewers say

### 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


### Penlight.

[App page](https://appshunter.io/ios/app/penlight/id6621271103)

This app provides a digital penlight with adjustable brightness and a built-in ruler for quick measurements. It also features color inversion for different examination needs and easy calibration using a credit card.

**Highlights:** Adjustable digital penlight brightness, Credit card calibration for accuracy, Color inversion for light/dark modes, Metric and imperial ruler, Educational examination tool

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

**In-app purchases:** none


## Frequently asked questions

### Is Calculator Keyboard free?

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

### Is Penlight. free?

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

### Which has better reviews, Calculator Keyboard or Penlight.?

Penlight. is rated higher. Calculator Keyboard averages 4.7 out of 5 from 493 ratings, while Penlight. averages 5.0 from 1 ratings.

### Do Calculator Keyboard or Penlight. have ads?

Neither Calculator Keyboard nor Penlight. shows ads.

### Which is updated more often, Calculator Keyboard or Penlight.?

Calculator Keyboard ships an update every 3 weeks, and Penlight. daily. Most recently, Calculator Keyboard was updated on October 27, 2026 and Penlight. 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.*