PCalc Lite vs Watch Calculator 87
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PCalc Lite
This free scientific calculator offers essential features like RPN mode, unit conversions, and multiple undo/redo. It provides a taste of a more powerful version, with optional in-app purchases for expanded functionality.
- Optional RPN mode
- Multiple undo and redo
- Unit conversions and constants
- Two stylish themes
- Apple Watch app
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PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody looking for a feature rich calculator. It includes an optional RPN mode and multi-line display, a choice of button layouts, an extensive set of unit conversions and constants, a paper tape, multiple undo and redo, engineering and scientific notation, as well as support for hexadecimal, octal, and binary calculations.PCalc Lite is a fully functional and free taste of our very popular scientific calculator. It includes an optional RPN mode, multiple undo and redo, unit conversions and constants, as well as two stylish themes and our highly praised design. A great choice for your new iPad! If you like what you see, the full version has many more settings and themes, a paper tape, engineering and scientific notation, and full support for hexadecimal, octal, and binary calculations. You can also now purchase extra features directly from inside PCalc Lite. Buy them individually, or buy everything. Includes an Apple Watch app, so you can calculate on your wrist!
Watch Calculator 87
A straightforward calculator designed specifically for your Apple Watch. Perform calculations quickly and easily directly from your wrist, with a simple interface for everyday math needs.
- Calculator for Apple Watch
- Simple interface
- Quick calculations
- Wrist-based operation
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Calculator for Apple Watch
Screenshots
Verdict
The clearest difference is in-app purchases: Watch Calculator 87 at none against PCalc Lite's 10. Watch Calculator 87 also leads on iOS requirement (12.0 vs 15.0). PCalc Lite's advantage is update cadence (every 2 months vs every 32 months) and ratings volume (214 vs 6). 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. PCalc Lite sells 10 one-off in-app purchases. Watch Calculator 87 asks for nothing beyond the download.
PCalc Lite holds the better App Store score, 4.4 against 4.2. That said, the two scores are not equally well evidenced: PCalc Lite has 214 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 82% of PCalc Lite's written reviews are positive against 67% of Watch Calculator 87's.
PCalc Lite ships an update every 2 months, Watch Calculator 87 every 32 months. The most recent releases landed on October 31, 2026 and November 3, 2026 respectively.
| Parameter | PCalc Lite | Watch Calculator 87 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (214 ratings) — better | 4.2 (6 ratings) |
| Positive reviews | 82.5% of reviews — better | 66.7% of reviews |
| Number of ratings | 214 — better | 6 |
| Update frequency | Every 2 months — better | Every 32 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPod, Apple Watch |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 79 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | TLA Systems Ltd. | Jose Maria Ortega Aguilera |
Customer experience
PCalc Lite
Watch Calculator 87
Bugs and requests
PCalc Lite
Reported bugs
3 issues- Calculations sometimes produce unexpected results
- Upside-down text censorship feature is problematic
- Purchased features not always accessible on Apple Watch
Requested features
4 requests- Add option to display thousands separators
- Implement a history function to review past calculations
- Provide more customization options for the widget
- Add support for sexagesimal angle input and conversion
Watch Calculator 87
Not enough reviews yet to summarise bugs or requests.
In-app purchases
PCalc Lite
- Theme Pack$0.99
- Power User Pack$0.99
- Multiple Line Pack$0.99
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- Conversion Pack$0.99
- Small Tip$0.99
- Medium Tip$1.99
- Programmer Pack$2.99
- Engineer Pack$2.99
- Large Tip$4.99
- Complete Pack$9.99
Watch Calculator 87
No in-app purchases
Questions
Is PCalc Lite free?
Is Watch Calculator 87 free?
Which has better reviews, PCalc Lite or Watch Calculator 87?
Do PCalc Lite or Watch Calculator 87 have ads?
Which is updated more often, PCalc Lite or Watch Calculator 87?
Other comparisons
