# Slide Rule vs GoodReader Pro PDF Editor

The clearest difference is price: Slide Rule at $0.99 against GoodReader Pro PDF Editor's $89.99. GoodReader Pro PDF Editor's advantage is rating (4.7 vs 1.0) and update cadence (every 4 weeks vs every 29 months). On review sentiment, ads, in-app purchases and monetization model there is nothing between them.

Slide Rule costs $0.99 and GoodReader Pro PDF Editor $89.99 up front. Neither carries in-app purchases, so what you see is what you pay.

GoodReader Pro PDF Editor holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: GoodReader Pro PDF Editor has 269 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 75% of Slide Rule's written reviews are positive against 68% of GoodReader Pro PDF Editor's, so the app with the better star average is not the one people write more warmly about.

Slide Rule ships an update every 29 months, GoodReader Pro PDF Editor every 4 weeks. The most recent releases landed on November 10, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | Slide Rule | GoodReader Pro PDF Editor |
| --- | --- | --- |
| Price | **$0.99** | $89.99 |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/slide-rule/id288454455/reviews) | **[4.7 (269 ratings)](https://appshunter.io/ios/app/goodreader-pro-pdf-editor/id1451012117/reviews)** |
| Number of ratings | 1 | **269** |
| Positive reviews | **75.0% of reviews** | 67.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 4 weeks** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#186** |
| Size | 3 MB | 53 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Masayuki Akamatsu](https://appshunter.io/developer/284722836) | [Good.iWare, Inc.](https://appshunter.io/developer/289191291) |

## What reviewers say

### Slide Rule

[App page](https://appshunter.io/ios/app/slide-rule/id288454455)

Simulates a mechanical analog computer for scientific and engineering calculations. Perform multiplication, division, roots, and trigonometric functions with a digital slide rule.

**Highlights:** Multiplication and division, Square and cube roots, Trigonometry functions, Logarithm calculations, Digital slide rule simulation, Mechanical analog computer

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### GoodReader Pro PDF Editor

[App page](https://appshunter.io/ios/app/goodreader-pro-pdf-editor/id1451012117)

**Currently charting:** #186 Top Paid · Productivity (US App Store)

This app offers robust PDF editing and annotation capabilities, alongside comprehensive file management for various document types. It allows users to securely store, organize, and access files from cloud services, enhancing productivity on mobile devices.

**Highlights:** PDF annotation and editing, File management for various formats, Cloud service integration (Dropbox, Google Drive, etc.), Military-grade AES-256 encryption, Split-screen viewing for iPad, PDF Reflow feature

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 📂 Excellent file management
- 📚 Great for PDF organization
- ✍️ Powerful annotation tools
- 🚀 Fast loading and performance
- 🔄 Reliable syncing

**What reviewers complain about**

- 💸 Expensive for some
- 🔄 Tedious data transfer to Pro
- ❓ Little difference between regular and Pro
- 🔌 Sync issues with cloud services
- 🚫 No PC version available

**Reported bugs**

- Cannot move bookmarks from old to Pro version
- Dropbox/OneDrive sync not working
- iCloud integration issues
- App crashes when adding photos
- App freezes after annotation

**Requested features**

- Proper night mode (inverted colors)
- Bookmark sharing feature
- PC version of the app
- Profile switching for open tabs
- Editable text feature


## Frequently asked questions

### Is Slide Rule free?

Slide Rule costs $0.99, with no in-app purchases.

### Is GoodReader Pro PDF Editor free?

GoodReader Pro PDF Editor costs $89.99, with no in-app purchases.

### Which has better reviews, Slide Rule or GoodReader Pro PDF Editor?

GoodReader Pro PDF Editor is rated higher. Slide Rule averages 1.0 out of 5 from 1 ratings, while GoodReader Pro PDF Editor averages 4.7 from 269 ratings.

### Do Slide Rule or GoodReader Pro PDF Editor have ads?

Neither Slide Rule nor GoodReader Pro PDF Editor shows ads.

### Which is updated more often, Slide Rule or GoodReader Pro PDF Editor?

Slide Rule ships an update every 29 months, and GoodReader Pro PDF Editor every 4 weeks. Most recently, Slide Rule was updated on November 10, 2026 and GoodReader Pro PDF Editor on November 11, 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.*