Formalize Light vs Calculator Keyboard
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Formalize Light
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.
- Mathematical keyboard extension
- Over 100 symbols
- One-handed access
- Professionally typeset formulas
- Convert formulas to TeX
- Insert formulas into any app
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Do you wish you could properly type math on your iPhone or iPad? With Formalize, you can! Formalize is a keyboard extension for mathematical content. It provides intuitive one-handed access to more than 100 symbols and produces professionally typeset formulas. Easily convert your formulas to PNG* or TeX and insert them anywhere, in any app! * Not available in Formalize Light
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
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Formalize Light | Calculator Keyboard |
|---|---|---|
| Price | Free | Free |
| Rating | 2.3 (4 ratings) | 4.7 (493 ratings) — better |
| Positive reviews | 16.7% of reviews | 76.8% of reviews — better |
| Number of ratings | 4 | 493 — better |
| Update frequency | Every 12 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.3 — better | 14.0 |
| Further details — not scored | ||
| Size | 62 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Ben Hambrecht | Supagarn Pattananuchart |
Customer experience
Formalize Light
Calculator Keyboard
Bugs and requests
Formalize Light
Not enough reviews yet to summarise bugs or 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
In-app purchases
Formalize Light
No in-app purchases
Calculator Keyboard
- Calku PRO (1 Month)$0.991 Month
- Calku Pro - Lifetime$5.99
Questions
Is Formalize Light free?
Is Calculator Keyboard free?
Which has better reviews, Formalize Light or Calculator Keyboard?
Do Formalize Light or Calculator Keyboard have ads?
Which is updated more often, Formalize Light or Calculator Keyboard?
Other comparisons
