Protractor Teacher vs f(x) Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Protractor Teacher
This geometry app overlays a virtual protractor onto images. Users can rotate and move the protractor to learn how to accurately measure angles in various contexts.
- Virtual protractor overlay
- Image angle measurement
- Protractor rotation
- Protractor repositioning
- Geometry education tool
Read full descriptionHide full description
A simple geometry app that is designed to overlay a protractor over an image. The protractor can be rotated and repositioned to teach students how to use a protractor to measure an angle.
f(x) Calc
A full-featured scientific calculator designed for math and science students. It offers natural math entry and includes built-in examples to aid learning. A simplified Junior mode is available for everyday use.
- Natural Maths entry
- Built-in learning examples
- Junior mode for everyday use
- Ideal for math and science study
- Full-featured scientific calculator
Read full descriptionHide full description
Full-featured Scientific Educational calculator with Natural Maths entry. Ideal for Maths and Science study with a built-in examples that will help you to learn how to use your calculator. The perfect backup when you don't have your school calculator. Try the Junior mode for every-day use, with easy access to the most essential functions.
Screenshots
Verdict
The clearest difference is price: f(x) Calc at Free against Protractor Teacher's $0.99. f(x) Calc also leads on rating (5.0 vs 4.5) and update cadence (every 10 days vs every 42 months). Protractor Teacher's advantage is in-app purchases (none vs 1) and iOS requirement (13.0 vs 16.6). On ratings volume, 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
f(x) Calc is free to download; Protractor Teacher costs $0.99 up front. f(x) Calc sells 1 one-off in-app purchase. Protractor Teacher asks for nothing beyond the download.
f(x) Calc holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
Protractor Teacher ships an update every 42 months, f(x) Calc every 10 days. The most recent releases landed on October 22, 2026 and October 10, 2026 respectively.
| Parameter | Protractor Teacher | f(x) Calc |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.5 (2 ratings) | 5.0 (1 ratings) — better |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 42 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 1 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Alistair Shaw | David Russell |
Customer experience
Protractor Teacher
f(x) Calc
In-app purchases
Protractor Teacher
No in-app purchases
f(x) Calc
- Full AccessFree
Questions
Is Protractor Teacher free?
Is f(x) Calc free?
Which has better reviews, Protractor Teacher or f(x) Calc?
Do Protractor Teacher or f(x) Calc have ads?
Which is updated more often, Protractor Teacher or f(x) Calc?
Other comparisons
