# IUOE 66 vs UWUA 433

The clearest difference is update cadence: UWUA 433 at every 8 days against IUOE 66's every 2 months. IUOE 66's advantage is iOS requirement (12.0 vs 16.4). 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.

IUOE 66 ships an update every 2 months, UWUA 433 every 8 days. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | IUOE 66 | UWUA 433 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (83 ratings)](https://appshunter.io/ios/app/iuoe-66/id725534647/reviews)** | — |
| Number of ratings | **83** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 8 days** |
| Monetization | Free | — |
| Size | 89 MB | 49 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [International Union of Operating Engrs (MD)](https://appshunter.io/developer/1634791783) | [Prometheus Labor Communications, Inc.](https://appshunter.io/developer/1102721713) |

## What reviewers say

### IUOE 66

[App page](https://appshunter.io/ios/app/iuoe-66/id725534647)

This app provides union members with access to news, updates on industry and contract specifics, and event information. It also includes features for reporting violations and accessing contact details. The tool aims to help members understand their union role and available benefits.

**Highlights:** General news and updates, Industry and contract updates, Call board integration, Contact information, Report violations, Political action and organizing

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### UWUA 433

[App page](https://appshunter.io/ios/app/uwua-433/id6480292519)

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

**In-app purchases:** none


## Frequently asked questions

### Is IUOE 66 free?

IUOE 66 is free to download, with no in-app purchases.

### Is UWUA 433 free?

UWUA 433 is free to download, with no in-app purchases.

### Do IUOE 66 or UWUA 433 have ads?

Neither IUOE 66 nor UWUA 433 shows ads.

### Which is updated more often, IUOE 66 or UWUA 433?

IUOE 66 ships an update every 2 months, and UWUA 433 every 8 days. Most recently, IUOE 66 was updated on November 1, 2026 and UWUA 433 on November 4, 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.*