# PlugGuide vs ULT

The clearest difference is update cadence: PlugGuide at every 2 months against ULT's every 14 months. PlugGuide also leads on iOS requirement (8.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

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

PlugGuide ships an update every 2 months, ULT every 14 months. The most recent releases landed on October 3, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | PlugGuide | ULT |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 14 months |
| Monetization | Free | — |
| Size | 8 MB | 11 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pluggit GmbH](https://appshunter.io/developer/698715683) | [Stefan Jakschik](https://appshunter.io/developer/1564456337) |

## What reviewers say

### PlugGuide

[App page](https://appshunter.io/ios/app/plugguide/id1384963687)

This app provides detailed information on central, decentralized, and unit-based ventilation systems. It offers tailored content for architects, installers, planners, property managers, owners, tenants, and wholesalers.

**Highlights:** Central ventilation systems, Decentralized ventilation systems, Unit-based ventilation systems, Tailored information for professionals, Information for homeowners and tenants

**Features:** macOS Compatibility

**In-app purchases:** none


### ULT

[App page](https://appshunter.io/ios/app/ult-calculator/id1564456335)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PlugGuide free?

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

### Is ULT free?

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

### Do PlugGuide or ULT have ads?

Neither PlugGuide nor ULT shows ads.

### Which is updated more often, PlugGuide or ULT?

PlugGuide ships an update every 2 months, and ULT every 14 months. Most recently, PlugGuide was updated on October 3, 2026 and ULT on September 28, 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.*