Calculator Keyboard vs Penlight.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator Keyboard
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.
- Calculate within any app
- Supports Dark Mode
- Customizable decimal points
- Scientific calculator functions
- Calculation history access
- Keyboard feedback options
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Calku transforms your keyboard into a handy calculator, making quick calculations effortless without switching apps! Whether you're texting, taking notes, or browsing, you can instantly calculate within any app. Perfect for messaging, homework, or day-to-day tasks. Compatible with many apps such as • Messages, Messenger, WeChat, Line, Twitter, Telegram, Instagram, etc. • Safari • Notes • Mail • Stocks • And many more! Features : • Supports Dark Mode • Full iPadOS Compatibility • Customizable Decimal Points • Powerful Scientific Calculator • Access Your Calculation History • Keyboard Feedback (Sound & Haptic) Say goodbye to app-switching and copying-pasting—Calku makes calculations easy and seamless in any app! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://supagarn-pa.com/Calku/privacy-policy
Penlight.
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.
- Adjustable digital penlight brightness
- Credit card calibration for accuracy
- Color inversion for light/dark modes
- Metric and imperial ruler
- Educational examination tool
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Key Features: - Digital Penlight: Adjustable brightness slider for precise illumination - Easy Calibration: Quickly calibrate with a credit card to for accurate measurements - Color Inversion: Easily switch between light and dark modes for different examination needs - Ruler: Metric and imperial ruler for quick measurements Disclaimer: This app is intended for educational purposes only. It is not to be used for the diagnosis or treatment of any medical condition.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Calculator Keyboard | Penlight. |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.7 (493 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 76.8% of reviews | — |
| Number of ratings | 493 — better | 1 |
| Update frequency | Every 3 weeks | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 14.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 3 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Supagarn Pattananuchart | My Call Bag LLC |
Customer experience
Calculator Keyboard
Penlight.
Bugs and requests
Calculator Keyboard
Reported bugs
7 issues- 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
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- Cannot get it to 'Add Keyboard' on specific devices/iOS versions
- No scientific calculator available
Requested features
8 requests- 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
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- Add scientific/accountant calculator
- Add Pi, square root, etc. to calculator
- Vibration on touch
Penlight.
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Calculator Keyboard
- Calku PRO (1 Month)$0.991 Month
- Calku Pro - Lifetime$5.99
Penlight.
No in-app purchases
Questions
Is Calculator Keyboard free?
Is Penlight. free?
Which has better reviews, Calculator Keyboard or Penlight.?
Do Calculator Keyboard or Penlight. have ads?
Which is updated more often, Calculator Keyboard or Penlight.?
Other comparisons
