# FZ SIide Rule vs Quail Tools

The clearest difference is rating: Quail Tools at 5.0 against FZ SIide Rule's 1.0. Quail Tools also leads on ratings volume (22 vs 1). FZ SIide Rule's advantage is update cadence (fortnightly vs every 5 weeks) and iOS requirement (9.0 vs 12.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Quail Tools holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: Quail Tools has 22 ratings behind it against 1, so its average is the more settled of the two.

FZ SIide Rule ships an update fortnightly, Quail Tools every 5 weeks. The most recent releases landed on September 26, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | FZ SIide Rule | Quail Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/fz-siide-rule/id1131995319/reviews) | **[5.0 (22 ratings)](https://appshunter.io/ios/app/quail-tools/id1279372123/reviews)** |
| Number of ratings | 1 | **22** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | Free | Free |
| Size | 11 MB | 50 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [D Young](https://appshunter.io/developer/933629750) | [Austin Angelle](https://appshunter.io/developer/1801766276) |

## What reviewers say

### FZ SIide Rule

[App page](https://appshunter.io/ios/app/fz-siide-rule/id1131995319)

This application provides a digital slide rule for finding critical dimensions of high-pressure wellhead equipment, including integral flange and ring groove measurements. It functions like a traditional paper slide rule, offering convenience and accessibility for users needing these specific engineering calculations.

**Highlights:** Integral flange dimensions, Ring groove dimensions, R Type ring gasket calculations, Pocket-sized slide rule functionality, High-pressure wellhead equipment data

**Features:** macOS Compatibility

**In-app purchases:** none


### Quail Tools

[App page](https://appshunter.io/ios/app/quail-tools/id1279372123)

Access essential specifications for Tubulars, BOPs, and API Casing offline. View detailed data like tool joint OD, make-up torque, and pressure ratings. Share spec sheets when an internet connection is available.

**Highlights:** Offline access to Tubular and BOP specs, API Casing General Information table, Detailed spec sheets for equipment, Shareable spec sheets (online), Save spec sheets to device, Tool joint OD, ID, torque, tensile, BOP pressure rating, bonnet type, operating data

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is FZ SIide Rule free?

FZ SIide Rule is free to download, with no in-app purchases.

### Is Quail Tools free?

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

### Which has better reviews, FZ SIide Rule or Quail Tools?

Quail Tools is rated higher. FZ SIide Rule averages 1.0 out of 5 from 1 ratings, while Quail Tools averages 5.0 from 22 ratings.

### Do FZ SIide Rule or Quail Tools have ads?

Neither FZ SIide Rule nor Quail Tools shows ads.

### Which is updated more often, FZ SIide Rule or Quail Tools?

FZ SIide Rule ships an update fortnightly, and Quail Tools every 5 weeks. Most recently, FZ SIide Rule was updated on September 26, 2026 and Quail Tools on October 21, 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.*