Comparison

Cullen IELTS 7+ vs LockFeed

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

Head to head
About

Cullen IELTS 7+

Enhance your IELTS vocabulary and test-taking skills with interactive exercises. Improve reading speed, listening accuracy, and active vocabulary to aim for Band 7 and above. Designed by an expert author, it offers a structured approach to learning.

Highlights
  • Vocabulary enhancement for IELTS
  • Synonym learning for reading/listening
  • Improved reading speed
  • Increased listening accuracy
  • Active vocabulary building
  • Topic-based exercises
  • Repetitive learning for retention
Features
Read full description

This app will help you to: increase your vocabulary for the IELTS writing and speaking tests; learn useful synonyms that will help you answer questions in the reading and listening tests; improve your reading speed and your listening accuracy; and improve your chances of achieving IELTS Band 7 and above. Many IELTS candidates try to learn vocabulary but can’t remember the words when they need to use them in the test. This app is designed to help you remember the words you learn, improve your active vocabulary (the vocabulary you use in speaking and writing), and increase your reading speed. Start by picking one of 25 topics, all related to the IELTS test. The first time you complete a topic, you must do the exercises in order – you can’t skip ahead! This is because you build your active vocabulary through repetition - it’s like having an IELTS teacher in your pocket. You will complete 10 different exercises to improve: speed reading, spelling, listening, and accurate use in a sentence. Once you have completed and unlocked all of the exercises in a topic, you can review them in any order, at any time. Repeat the topics to try to improve your accuracy in use, spelling, and to increase your speed-reading time. If you find the words too difficult, look out for IELTS Vocab 6+ coming out soon. This app was written and designed by Pauline Cullen, the author of • The Official Cambridge Guide to IELTS • Cambridge Vocabulary for IELTS • Cambridge Vocabulary for IELTS Advanced • Common Mistakes at IELTS Intermediate • Cambridge Grammar for IELTS (co-author) The app was constructed and produced by the amazing people at PEEK Creative, Cambridge, UK. I brought them the individual parts and a picture in my head and they assembled it, gave it an engine and made it work better than I ever imagined. Book reviews for The Official Cambridge Guide to IELTS: ‘All books from this author are excellent.’  ‘Worked like a charm for me. My test was exactly what this book showed it would be.’ ‘Very happy...Best book for preparation to sit IELTS and get a high band’ ‘This book is very helpful for IELTS exam I passed very well after using it, having failed the exam previously.’ ‘This is one of the best IELTS course books I've come across. …Highly recommended.’

About

LockFeed

This app requires users to answer short quizzes before granting access to selected applications. Users can customize unlock times and the number of questions needed per unlock. It offers various learning topics and a one-time purchase for unlimited access.

Highlights
  • Answer quizzes to unlock apps
  • Customize unlock duration
  • Select number of questions per unlock
  • Variety of quiz topics
  • Offline quiz content
  • One-time purchase for unlimited access
Read full description

Earn your screen time with a little learning. LockFeed puts a short challenge before the apps you choose. Enable one or more quizzes, choose how many questions to complete, and use Apple Screen Time to add a pause before you scroll. HOW IT WORKS • Choose the apps you want to lock. • Enable quizzes and choose how many correct answers you need to unlock. • Set a default unlock time, with optional custom times for individual apps. • Complete your challenge to unlock the app you want to use. • When your unlock time ends, the app locks again. MAKE EACH UNLOCK YOUR OWN Start with one question per unlock, or choose up to 10. Each completed quiz round counts as one question. Your progress is saved if you leave before finishing. Use Manage Apps to Lock to add or remove apps and give each app its own unlock time, or let it follow your default. Changing a time does not cut short an unlock you have already earned. FIVE FREE APP UNLOCKS Try five successful quiz-based app unlocks. After those five unlocks, Lifetime Access is required for further unlocks. Each earned unlock lasts for the full duration you chose. LIFETIME ACCESS A one-time in-app purchase enables unlimited quiz-based app unlocks and standalone quiz practice. Standalone practice requires Lifetime Access. There is no subscription, and the price for your region is shown before purchase. Restore Purchases is available for previous buyers. FIND SOMETHING YOU WANT TO LEARN Practice vocabulary, identify famous artworks and country flags, solve chess puzzles, or find notes on a guitar fretboard. Read short Python functions and identify their time complexity, or explore practice questions in math, science, exam preparation, driving theory, and citizenship. Learn about AI with LLM Fundamentals and Practical Deep Learning: 304 questions with explanations and links to supporting lessons. Questions and explanations work offline; opening source lessons requires an internet connection. Your enabled quizzes form a shared pool across your protected apps. The quizzes take turns in a shuffled order, with each getting a turn before repeating. When you require multiple answers, each question advances to the next quiz in the rotation. Manage your enabled quizzes or adjust your unlock settings anytime. Quiz content is bundled for offline use, and no account is required. CHOOSE YOUR STYLE Switch between Classic and a neutral black-and-white Dark appearance in Settings. Your lock screens follow your chosen style, while quiz artwork keeps its original colors. HAVE AN IDEA OR NEED HELP? Use the Feedback tab to write a message and send it to joma@lockfeed.app from your email account. Unsent drafts are saved on your device. LockFeed uses Apple Screen Time permission to manage access to the apps you select. Short practice quizzes are learning aids, not complete exam preparation courses or official exam simulations.

Screenshots

Cullen IELTS 7+4 screens
LockFeed4 screens

Verdict

The call

The clearest difference is review sentiment: LockFeed at 100% against Cullen IELTS 7+'s 32%. LockFeed also leads on price (Free vs $2.99) and rating (4.3 vs 3.3). Cullen IELTS 7+'s advantage is in-app purchases (none vs 6) and iOS requirement (8.2 vs 18.0). On ratings volume, ads and device support 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

LockFeed is free to download; Cullen IELTS 7+ costs $2.99 up front. LockFeed sells 6 one-off in-app purchases. Cullen IELTS 7+ asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

LockFeed holds the better App Store score, 4.3 against 3.3. Both are backed by a comparable volume of ratings — 7 and 11 respectively. Written reviews point the same way: 32% of Cullen IELTS 7+'s written reviews are positive against 100% of LockFeed's.

UpkeepUpdate frequency

Cullen IELTS 7+ ships an update every 63 months, LockFeed daily. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

Scorecard7 real differences · 3 level
Cullen IELTS 7+ versus LockFeed: the parameters behind the verdict, then further details
ParameterCullen IELTS 7+LockFeed
Price$2.99Free — better
Rating3.3 (7 ratings)4.3 (11 ratings) — better
Positive reviews32.3% of reviews100.0% of reviews — better
Number of ratings711 — better
Update frequencyEvery 63 monthsDaily — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPod — betteriPhone
Requires iOS8.2 — better18.0
Further details — not scored
Size15 MB33 MB
Age rating4+12+
DeveloperCullen Education Ltd (Apps)Mosaic Integral Innovations LLC

Customer experience

Cullen IELTS 7+

All ratings7 ratings
Positive57.1%
Neutral0.0%
Negative42.9%
Written reviews31 reviews
Positive32.3%
Neutral6.5%
Negative61.3%

LockFeed

All ratings11 ratings
Positive81.8%
Neutral0.0%
Negative18.2%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Cullen IELTS 7+

No in-app purchases

6 purchases

LockFeed

One-time6
  • Lifetime Access$0.99
  • Lifetime Access$2.99
  • Lifetime Access$4.99
Show 3 more
  • Lifetime Access$9.99
  • Lifetime Access$19.99
  • Lifetime Access$30.00

Questions

Is Cullen IELTS 7+ free?
Cullen IELTS 7+ costs $2.99, with no in-app purchases.
Is LockFeed free?
LockFeed is free to download, with in-app purchases available.
Which has better reviews, Cullen IELTS 7+ or LockFeed?
LockFeed is rated higher. Cullen IELTS 7+ averages 3.3 out of 5 from 7 ratings, while LockFeed averages 4.3 from 11 ratings.
Do Cullen IELTS 7+ or LockFeed have ads?
Neither Cullen IELTS 7+ nor LockFeed shows ads.
Which is updated more often, Cullen IELTS 7+ or LockFeed?
Cullen IELTS 7+ ships an update every 63 months, and LockFeed daily. Most recently, Cullen IELTS 7+ was updated on November 2, 2026 and LockFeed on October 31, 2026.

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