# Digital Slide Rule vs Calcu

The clearest difference is update cadence: Calcu at every 3 days against Digital Slide Rule's every 4 months. Digital Slide Rule's advantage is ratings volume (15 vs 1) and iOS requirement (6.0 vs 15.0). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Digital Slide Rule against 5.0 for Calcu. That said, the two scores are not equally well evidenced: Digital Slide Rule has 15 ratings behind it against 1, so its average is the more settled of the two.

Digital Slide Rule ships an update every 4 months, Calcu every 3 days. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Digital Slide Rule | Calcu |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (15 ratings)](https://appshunter.io/ios/app/digital-slide-rule/id1116881577/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/calcu-logarithm/id6698852208/reviews) |
| Number of ratings | **15** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | Free | Free |
| Size | 59 MB | 3 MB |
| Requires iOS | **6.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ace Hoffman](https://appshunter.io/developer/704983956) | [Yuri Morozov](https://appshunter.io/developer/1582368813) |

## What reviewers say

### Digital Slide Rule

[App page](https://appshunter.io/ios/app/digital-slide-rule/id1116881577)

This app digitally recreates various types of slide rules, offering features not possible on physical models like color options and numeric displays. It includes a slideshow of famous slide rules and is best experienced on larger devices.

**Highlights:** Simulates straight, circular, spiral, and cylindrical slide rules, Dozens of scales included, Color options and numeric value displays, Includes a slideshow of famous slide rules, Supports two-finger pinch/zoom and image rotation

**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 Digital Slide Rule free?

Digital Slide Rule is free to download, with no in-app purchases.

### Is Calcu free?

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

### Which has better reviews, Digital Slide Rule or Calcu?

Digital Slide Rule and Calcu are both rated 5.0 out of 5 on the App Store, from 15 and 1 ratings respectively.

### Do Digital Slide Rule or Calcu have ads?

Neither Digital Slide Rule nor Calcu shows ads.

### Which is updated more often, Digital Slide Rule or Calcu?

Digital Slide Rule ships an update every 4 months, and Calcu every 3 days. Most recently, Digital Slide Rule was updated on November 2, 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.*