# ADI Theory Test Kit vs Vocab Builder

The clearest difference is review sentiment: Vocab Builder at 100% against ADI Theory Test Kit's 62%. Vocab Builder also leads on ratings volume (69 vs 2). ADI Theory Test Kit's advantage is update cadence (weekly vs every 3 months) and rating (5.0 vs 4.8). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. ADI Theory Test Kit sells 9 in-app purchases, starting at $6.99 per month and Vocab Builder sells 4 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ADI Theory Test Kit holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Vocab Builder has 69 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 62% of ADI Theory Test Kit's written reviews are positive against 100% of Vocab Builder's, so the app with the better star average is not the one people write more warmly about.

ADI Theory Test Kit ships an update weekly, Vocab Builder every 3 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | ADI Theory Test Kit | Vocab Builder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/adi-theory-test-kit/id595149765/reviews)** | [4.8 (69 ratings)](https://appshunter.io/ios/app/vocab-builder-learn-words/id6449472049/reviews) |
| Number of ratings | 2 | **69** |
| Positive reviews | 61.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 months |
| Monetization | Free with in-app purchases | Freemium |
| Size | 80 MB | 38 MB |
| Requires iOS | 15 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Deep River Development Ltd](https://appshunter.io/developer/489255197) | [CHORRUS GAMES S.L.](https://appshunter.io/developer/955143849) |

## What reviewers say

### ADI Theory Test Kit

[App page](https://appshunter.io/ios/app/adi-theory-test-kit/id595149765)

Prepare for your ADI Theory Test with practice questions covering all DVSA licensed topics. This app offers mock tests under real conditions, immediate scoring with explanations, and progress tracking. It includes the Highway Code and works offline, with regular updates for the latest 2026 content.

**Highlights:** 860+ DVSA licensed revision questions, Revise bands separately or together, Immediate scoring with explanations, Mock test function, Advanced progress statistics, Works offline, Highway Code included

**Features:** Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Silver | $6.99 | per month |
| Monthly Gold | $7.99 | per month |
| ADI Theory Test and Hazards UK | $9.99 | per month |
| Free HPT videos | Free | one-time |
| Only HPT videos for ADI | $1.99 | one-time |
| ADI Theory Test 4 in 1 | $3.99 | one-time |
| Unlock all topics | $6.99 | one-time |
| ADI Theory Test 4 in 1 | $7.99 | one-time |
| ADI Theory Test 4 in 1 | $9.99 | one-time |

**What reviewers like**

- 👍 Great app for learning
- 👍 Easy to use and understand
- 👍 Helpful for passing tests
- 👍 Good explanations provided
- 👍 Well organized app

**What reviewers complain about**

- 🐛 Missing questions
- 🐛 Unclear hazard perception videos
- 🐛 No way to contact support
- 🐛 App not updated
- 🐛 Reader voice not clear

**Reported bugs**

- App not updated since 2020
- Cannot copy words
- Reader voice not clear
- Hazard perception fails unfairly
- Paid videos not downloaded/working

**Requested features**

- One-off payment option
- Option to choose answer reading
- More hazard perception practice videos
- Dark mode option


### Vocab Builder

[App page](https://appshunter.io/ios/app/vocab-builder-learn-words/id6449472049)

Enhance your English vocabulary with AI-powered word suggestions and personalized learning paths. Master new words through engaging levels, example sentences, and spaced repetition techniques. Prepare for standardized tests like TOEFL and IELTS with curated word lists.

**Highlights:** AI-generated word lists, 1000+ categories, Definitions and examples, Basic to advanced levels, Spaced repetition, Progress tracking, Exam preparation

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vocab Builder Pro - Weekly | $4.99 | per 7 days |
| Vocab Builder Pro: Monthly | $9.99 | per month |
| Vocab Builder Pro - Limited | $14.99 | per year |
| Vocab Builder Pro: Yearly | $29.99 | per year |


## Frequently asked questions

### Is ADI Theory Test Kit free?

ADI Theory Test Kit is free to download, with in-app purchases available.

### Is Vocab Builder free?

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

### Which has better reviews, ADI Theory Test Kit or Vocab Builder?

ADI Theory Test Kit is rated higher. ADI Theory Test Kit averages 5.0 out of 5 from 2 ratings, while Vocab Builder averages 4.8 from 69 ratings.

### Do ADI Theory Test Kit or Vocab Builder have ads?

Neither ADI Theory Test Kit nor Vocab Builder shows ads.

### Which is updated more often, ADI Theory Test Kit or Vocab Builder?

ADI Theory Test Kit ships an update weekly, and Vocab Builder every 3 months. Most recently, ADI Theory Test Kit was updated on November 6, 2026 and Vocab Builder on November 3, 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.*