Keyboard² vs Time Calc. Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Keyboard²
This custom keyboard app allows you to play musical notes and chords directly from your device's keyboard. It supports entering numbers, mathematical symbols, and ABC music notation, with the ability to play sounds and chords.
- Play musical notes and chords
- Enter numbers and mathematical symbols
- Supports ABC music notation
- Play sounds
- Custom keyboard functionality
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Keyboard² is a custom keyboard that enables you to play the keyboard on your iPhone & iPad! [Function] - You can enter numbers and mathematical symbols. - You can enter the musical scales of ABC music notation. - You can play sound. - You can play a chord. [Attention] - You have to do the additional procedure of Keyboard² to use it. (Preferences -> General -> Keyboard) - Then, you also have to turn on the "Full Access" for Keyboard². * Please don’t worry - we do not collect your data at all. [Support] - Please do not hesitate to contact us for any defect reports or questions/requests. - We will consider any requests for additional functions.
Time Calc. Pro
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A calculator that adds and subtracts hours and minutes. You can see the calculation history. You can change the key layout to look like a computer or a phone as you like. Since no advertisement is given, the history screen can be widened.
Screenshots
Verdict
The clearest difference is price: Keyboard² at Free against Time Calc. Pro's $0.99. Keyboard² also leads on update cadence (every 12 months vs every 28 months). On ads, in-app purchases, device support and iOS requirement 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
Keyboard² is free to download; Time Calc. Pro costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Keyboard² ships an update every 12 months, Time Calc. Pro every 28 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | Keyboard² | Time Calc. Pro |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 12 months — better | Every 28 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 13.4 |
| Further details — not scored | ||
| Size | 11 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Takuto Nakamura | Hiroyuki Nishijima |
In-app purchases
Keyboard²
No in-app purchases
Time Calc. Pro
No in-app purchases
Questions
Is Keyboard² free?
Is Time Calc. Pro free?
Do Keyboard² or Time Calc. Pro have ads?
Which is updated more often, Keyboard² or Time Calc. Pro?
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