# Max Zs Values vs CEF TechTalks

The clearest difference is price: CEF TechTalks at Free against Max Zs Values's $9.99. Max Zs Values's advantage is iOS requirement (11.0 vs 14.0). On ads, in-app purchases and device support there is nothing between them.

CEF TechTalks 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.

## The numbers

| Metric | Max Zs Values | CEF TechTalks |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Positive reviews | 55.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | — |
| Monetization | Paid | — |
| Size | 15 MB | 54 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pro Certs Software Ltd](https://appshunter.io/developer/444429696) | [City Electrical Factors Ltd](https://appshunter.io/developer/603140958) |

## 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


### CEF TechTalks

[App page](https://appshunter.io/ios/app/cef-techtalks/id6760725844)

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

**In-app purchases:** none


## Frequently asked questions

### Is Max Zs Values free?

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

### Is CEF TechTalks free?

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

### Do Max Zs Values or CEF TechTalks have ads?

Neither Max Zs Values nor CEF TechTalks shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*