Comparison

ADI Theory Test Kit vs Vocab Builder

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ADI Theory Test Kit

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
Read full description

Practice all 860 of the latest 2026 ADI Theory Test Revision Questions ADI Theory Test UK allows you to practice for your test whenever and wherever you like. All 860 of the latest DVSA licensed (former DSA) revision questions covering all four bands of the test are included. This simple and intuitive app that allows you to answer questions at your leisure or under real test conditions, whilst advanced statistics enables you to keep track of your progress. ***Key features*** Revise each of the four bands of the test separately or at the same time Questions are scored immediately and each question comes with full background information No annoying repetition - choose how many times you want to repeat questions previously answered correctly Mock test function uses the same scoring and time limit as the real test Simple and intuitive interface allows you to focus your efforts on revision Advanced statistics all you to keep track of your progress overall and on different sections of the test Absolutely NO ADVERTS Highway code included Regularly updated - 2026 ready Works offline - train whenever and wherever you want iCloud support allows you to sync your results on your iPad and iPhone ____________________________________ Terms & Conditions: https://drivingtheorytest.org/termsandconditions/ Crown copyright material has been reproduced by permission of the Driving Standards Agency, which does not accept any responsibility for the accuracy of the reproduction.

About

Vocab Builder

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
Read full description

No matter how good you are at English, you can always learn new words and improve your vocabulary with Vocab Builder App. Vocab Builder: • Unlimited words in 1000+ different categories updated daily by AI • Definitions and example sentences for every word • Basic, Intermediate, and Advanced vocabulary sections • Beat levels to unlock new words • Track your progress as you study • Now available on iPhone and iPad Our app also helps you prepare to exams like TOEFL and IELTS Created by experts, backed by AI * The entire wordlist is selected and defined with our AI technology that analyse your progress, mistakes and your level to provide you interesting words every day. Designed for fun and learning that really sticks * Each level you beat unlocks a harder one: more words and more advanced vocabulary. Words you don't know will be repeated until you master them, using spaced repetition which has been shown to be a very effective memorization strategy. Have any questions? Please ask! * Customer satisfaction is incredibly important to us. If you have any questions or comments, please contact us at https://chorrusgames.com/support and we'll get back to you as quickly as we can. * Subscription and Pricing: If you choose to purchase, payment will be applied to your iTunes account at confirmation of purchase. Subscriptions will automatically renew unless canceled within 24-hours before the end of the current period. You can cancel anytime with your iTunes account settings. Any unused portion of a free trial will be forfeited if you purchase a subscription. The current Vocab Builder Pro subscription starts at $9.99 USD/month. Prices may vary in different countries. Privacy Policy: https://www.notion.so/Privacy-Terms-b7c8da7e80cb49de812ce7928b19faaf Terms of Use: https://www.notion.so/Privacy-Terms-b7c8da7e80cb49de812ce7928b19faaf

Screenshots

ADI Theory Test Kit4 screens
Vocab Builder4 screens

Verdict

The call

The clearest difference is review sentiment: Vocab Builder at 100% against ADI Theory Test Kit's 63%. 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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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: 63% 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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
ADI Theory Test Kit versus Vocab Builder: the parameters behind the verdict, then further details
ParameterADI Theory Test KitVocab Builder
PriceFreeFree
Rating5.0 (2 ratings) — better4.8 (69 ratings)
Positive reviews62.7% of reviews100.0% of reviews — better
Number of ratings269 — better
Update frequencyWeekly — betterEvery 3 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS1515.0
Further details — not scored
Size80 MB38 MB
Age rating4+4+
DeveloperDeep River Development LtdCHORRUS GAMES S.L.

Customer experience

ADI Theory Test Kit

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews51 reviews
Positive62.7%
Neutral11.8%
Negative25.5%

Vocab Builder

All ratings69 ratings
Positive95.7%
Neutral4.3%
Negative0.0%
Written reviews7 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

ADI Theory Test Kit

Reported bugs

10 issues
  • App not updated since 2020
  • Cannot copy words
  • Reader voice not clear
  • Hazard perception fails unfairly
  • Paid videos not downloaded/working
Show 5 more
  • Hazard perception timing issues
  • Mock test crashes before results
  • Signs not appearing in questions
  • App crashes at end of mock test
  • Road signs not showing in questions

Requested features

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

Vocab Builder

Not enough reviews yet to summarise bugs or requests.

In-app purchases

9 purchases

ADI Theory Test Kit

Subscriptions3
  • Monthly Silver$6.991 Month
  • Monthly Gold$7.991 Month
  • ADI Theory Test and Hazards UK$9.991 Month
One-time6
  • Free HPT videosFree
  • Only HPT videos for ADI$1.99
  • ADI Theory Test 4 in 1$3.99
Show 3 more
  • Unlock all topics$6.99
  • ADI Theory Test 4 in 1$7.99
  • ADI Theory Test 4 in 1$9.99
4 purchases

Vocab Builder

Subscriptions4
  • Vocab Builder Pro - Weekly$4.997 Days
  • Vocab Builder Pro: Monthly$9.991 Month
  • Vocab Builder Pro - Limited$14.991 Year
Show 1 more
  • Vocab Builder Pro: Yearly3 Days trial$29.991 Year

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.

Other comparisons