# Pocket Slide Rule Expert vs x

The clearest difference is price: x at Free against Pocket Slide Rule Expert's $0.99. x also leads on update cadence (fortnightly vs every 4 months). Pocket Slide Rule Expert's advantage is iOS requirement (9.0 vs 18.0). On ads, in-app purchases and device support there is nothing between them.

x is free to download; Pocket Slide Rule Expert costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Pocket Slide Rule Expert ships an update every 4 months, x fortnightly. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Pocket Slide Rule Expert | x |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/pocket-slide-rule-expert/id434331277/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 16 MB | 1 MB |
| Requires iOS | **9.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [TestTubeGames](https://appshunter.io/developer/421890276) | [FMILLET](https://appshunter.io/developer/550887984) |

## What reviewers say

### Pocket Slide Rule Expert

[App page](https://appshunter.io/ios/app/pocket-slide-rule-expert/id434331277)

Learn to use a classic slide rule with this app. It offers precise calculations and an "auto-slide-rule" mode to demonstrate operations. Save and reuse slider positions for frequent calculations.

**Highlights:** Classic slide rule simulation, Auto-slide-rule demonstration mode, Precise cursor and slider control, Save and reuse slider positions ('Snaps'), 19 basic operations supported, Multiplication, division, powers, logs, trig functions

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

**In-app purchases:** none


### x

[App page](https://appshunter.io/ios/app/x-cal-plus/id6747112339)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Pocket Slide Rule Expert free?

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

### Is x free?

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

### Do Pocket Slide Rule Expert or x have ads?

Neither Pocket Slide Rule Expert nor x shows ads.

### Which is updated more often, Pocket Slide Rule Expert or x?

Pocket Slide Rule Expert ships an update every 4 months, and x fortnightly. Most recently, Pocket Slide Rule Expert was updated on November 6, 2026 and x 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.*