# API 510 Highlights Practices vs CWI Welding Exam Prep

The clearest difference is in-app purchases: API 510 Highlights Practices at none against CWI Welding Exam Prep's 3. API 510 Highlights Practices also leads on device support (3 vs 1) and iOS requirement (9.1 vs 17.0). CWI Welding Exam Prep's advantage is update cadence (every 3 weeks vs every 2 months). On price and ads there is nothing between them.

Both are free to download. CWI Welding Exam Prep sells 3 in-app purchases, starting at $9.99 per month. API 510 Highlights Practices asks for nothing beyond the download.

API 510 Highlights Practices ships an update every 2 months, CWI Welding Exam Prep every 3 weeks. Both last shipped on October 16, 2026.

## The numbers

| Metric | API 510 Highlights Practices | CWI Welding Exam Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (7 ratings)](https://appshunter.io/ios/app/cwi-welding-exam-prep/id6758101756/reviews)** |
| Number of ratings | — | **7** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | — | Freemium |
| Size | 16 MB | 6 MB |
| Requires iOS | **9.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nguyen Hieu](https://appshunter.io/developer/1323491316) | [Deeun Inc.](https://appshunter.io/developer/1691824695) |

## What reviewers say

### API 510 Highlights Practices

[App page](https://appshunter.io/ios/app/api-510-highlights-practices/id1362433334)

**Features:** macOS Compatibility

**In-app purchases:** none


### CWI Welding Exam Prep

[App page](https://appshunter.io/ios/app/cwi-welding-exam-prep/id6758101756)

Prepare for all three parts of the AWS CWI exam with this comprehensive study tool. Features include a weld symbol decoder, discontinuity reference, and over 490 practice questions covering fundamentals, practical inspection, and code book navigation. Access a free overview and daily questions.

**Highlights:** Three-part exam preparation (Fundamentals, Practical, Code Book), Weld symbol decoder based on AWS A2.4, Discontinuity reference with causes and acceptance criteria, 490+ practice questions, Covers welding processes, metallurgy, NDT, and safety, Code navigation assistance

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Access | $9.99 | per month |
| Annual Access | $24.99 | per year |
| CWI Prep  - Lifetime Pro | $49.99 | one-time |


## Frequently asked questions

### Is API 510 Highlights Practices free?

API 510 Highlights Practices is free to download, with no in-app purchases.

### Is CWI Welding Exam Prep free?

CWI Welding Exam Prep is free to download, with in-app purchases available.

### Do API 510 Highlights Practices or CWI Welding Exam Prep have ads?

Neither API 510 Highlights Practices nor CWI Welding Exam Prep shows ads.

### Which is updated more often, API 510 Highlights Practices or CWI Welding Exam Prep?

API 510 Highlights Practices ships an update every 2 months, and CWI Welding Exam Prep every 3 weeks. Most recently, API 510 Highlights Practices was updated on October 16, 2026 and CWI Welding Exam Prep on October 16, 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.*