# Max Zs Values vs SpanSet

The clearest difference is price: SpanSet at Free against Max Zs Values's $9.99. SpanSet also leads on review sentiment (71% vs 55%) and iOS requirement (6.0 vs 11.0). Max Zs Values's advantage is update cadence (every 4 months vs every 27 months). On ads, in-app purchases and device support there is nothing between them.

SpanSet is free to download; Max Zs Values costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Max Zs Values ships an update every 4 months, SpanSet every 27 months. The most recent releases landed on October 26, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Max Zs Values | SpanSet |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Positive reviews | 55.2% of reviews | **71.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 27 months |
| Monetization | Paid | **Free** |
| Size | 15 MB | 24 MB |
| Requires iOS | 11.0 | **6.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pro Certs Software Ltd](https://appshunter.io/developer/444429696) | [Optical 3D Ltd](https://appshunter.io/developer/450478255) |

## What reviewers say

### Max Zs Values

[App page](https://appshunter.io/ios/app/max-zs-values/id498838137)

This app calculates and displays maximum permitted Zs values for electrical installations, adhering to the 18th Edition of BS 7671. It includes 80% temperature adjusted values and manufacturer charts for MCCB devices, along with a converter for older Zs values.

**Highlights:** 100% BS 7671 Zs Values, 80% On Site Guide Zs Values, Adjustable disconnection times (0.4s, 0.2s, 5s), BS EN Device Zs calculation, MCCB 60947-2 Zs charts, Zs Converter for 18th edition

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

**In-app purchases:** none


### SpanSet

[App page](https://appshunter.io/ios/app/spanset-inspector/id530126043)

An interactive guide for inspectors of height safety equipment. It provides detailed information on harnesses, lanyards, and connectors to ensure proper inspection procedures.

**Highlights:** Interactive guide, Height safety equipment inspection, Harnesses, Lanyards, Connectors

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Max Zs Values free?

Max Zs Values costs $9.99, with no in-app purchases.

### Is SpanSet free?

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

### Do Max Zs Values or SpanSet have ads?

Neither Max Zs Values nor SpanSet shows ads.

### Which is updated more often, Max Zs Values or SpanSet?

Max Zs Values ships an update every 4 months, and SpanSet every 27 months. Most recently, Max Zs Values was updated on October 26, 2026 and SpanSet on October 7, 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.*