# Pythagoras HD vs Calcu

The clearest difference is price: Calcu at Free against Pythagoras HD's $0.99. Calcu also leads on rating (5.0 vs 1.0) and update cadence (every 3 days vs every 24 months). Pythagoras HD's advantage is iOS requirement (12.0 vs 15.0). On ratings volume, ads and in-app purchases there is nothing between them.

Calcu is free to download; Pythagoras HD costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Calcu holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Pythagoras HD ships an update every 24 months, Calcu every 3 days. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Pythagoras HD | Calcu |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/pythagoras-hd/id404432708/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/calcu-logarithm/id6698852208/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 42.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 3 days** |
| Monetization | Paid | **Free** |
| Size | 10 MB | 3 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Koksharov](https://appshunter.io/developer/700716922) | [Yuri Morozov](https://appshunter.io/developer/1582368813) |

## What reviewers say

### Pythagoras HD

[App page](https://appshunter.io/ios/app/pythagoras-hd/id404432708)

Explore the Pythagorean Theorem through interactive puzzles and visual proofs. This educational app offers a unique, formula-free approach to understanding geometry. It's designed to make learning engaging and accessible.

**Highlights:** Visual proofs of Pythagorean Theorem, Interactive geometric puzzles, Formula-free learning, Engaging educational experience, iPad compatibility

**Features:** macOS Compatibility

**In-app purchases:** none


### Calcu

[App page](https://appshunter.io/ios/app/calcu-logarithm/id6698852208)

This app provides advanced logarithmic calculations and explanations, covering equation solving, Taylor series, digit-by-digit computation, and integral definitions. It also simplifies expressions, solves complex logarithmic equations, and includes a virtual slide rule.

**Highlights:** Solves logarithmic equations for y, x, and a, Explains Taylor series for log_e(x), Illustrates digit-by-digit log_10(x) computation, Explains log_e definition via integrals, Simplifies logarithmic expressions, Calculates and graphs complex logarithms, Includes virtual slide rule

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Pythagoras HD free?

Pythagoras HD costs $0.99, with no in-app purchases.

### Is Calcu free?

Calcu is free to download, with no in-app purchases.

### Which has better reviews, Pythagoras HD or Calcu?

Calcu is rated higher. Pythagoras HD averages 1.0 out of 5 from 1 ratings, while Calcu averages 5.0 from 1 ratings.

### Do Pythagoras HD or Calcu have ads?

Neither Pythagoras HD nor Calcu shows ads.

### Which is updated more often, Pythagoras HD or Calcu?

Pythagoras HD ships an update every 24 months, and Calcu every 3 days. Most recently, Pythagoras HD was updated on November 1, 2026 and Calcu on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*