# RCA Certificate vs PlumberAI

The clearest difference is in-app purchases: RCA Certificate at none against PlumberAI's 3. RCA Certificate also leads on iOS requirement (13.0 vs 15.1). PlumberAI's advantage is update cadence (every 3 months vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. PlumberAI sells 3 in-app purchases, starting at $12.99 per month. RCA Certificate asks for nothing beyond the download.

RCA Certificate ships an update every 5 months, PlumberAI every 3 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | RCA Certificate | PlumberAI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/plumberai/id6761505636/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Monetization | — | Freemium |
| Size | 31 MB | 44 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Cogneti, LLC](https://appshunter.io/developer/690595877) | [PlumberAI LLC](https://appshunter.io/developer/1890037797) |

## What reviewers say

### RCA Certificate

[App page](https://appshunter.io/ios/app/rca-certificate/id1610932123)

**In-app purchases:** none


### PlumberAI

[App page](https://appshunter.io/ios/app/plumberai/id6761505636)

This app serves as a comprehensive toolkit for plumbers, offering exam preparation with practice questions and mock exams. It also helps track on-the-job training hours, provides access to plumbing codes, and includes an AI assistant for instant answers to plumbing queries.

**Highlights:** Exam preparation with practice questions, Mock exams and weak area tracking, OJT hours log and affidavit generator, IPC code sections and reference materials, AI-powered plumbing assistant, Plumbing supply finder, License renewal links

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PlumberAI Pro | $12.99 | per month |
| PlumberAI Pro Annual | $129.99 | per year |
| PlumberAI Pro | $129.99 | per year |


## Frequently asked questions

### Is RCA Certificate free?

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

### Is PlumberAI free?

PlumberAI is free to download, with in-app purchases available.

### Do RCA Certificate or PlumberAI have ads?

Neither RCA Certificate nor PlumberAI shows ads.

### Which is updated more often, RCA Certificate or PlumberAI?

RCA Certificate ships an update every 5 months, and PlumberAI every 3 months. Most recently, RCA Certificate was updated on October 27, 2026 and PlumberAI on October 24, 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.*