Comparison

O vs PaperStack CAIE Past Papers

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

Head to head
About

O

Features
Read full description

Prepare confidently for O-Level Mathematics with everything you need in one convenient revision app. • Clear, topic-based revision notes • Topical formula sheets • Questions and answers organized by syllabus topic • Detailed answer explanations • Timed practice quizzes with score history • Offline access for revision anywhere Ideal for Cambridge O Level Mathematics (4024) learners preparing for tests and examinations. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

PaperStack CAIE Past Papers

Access over 15,000 CAIE past papers with an AI tutor and multiplayer revision modes. Practice by topic or year, solve MCQs interactively, and study offline. Features include smart PDF viewing and annotation tools.

Highlights
  • 15,000+ CAIE past papers
  • AI Tutor with examiner insights
  • Real-time multiplayer revision
  • Topical paper generation
  • Interactive MCQ solver
  • Offline access
  • Smart PDF viewer with annotations
Features
Read full description

Revise smarter with PaperStack, your all-in-one IGCSE, O Level & A Level past paper app. Access 15,000+ past papers, mark schemes and exam resources, practise questions by topic, check your answers instantly, get AI-powered explanations and compete with other students in real-time multiplayer. PAST PAPERS & MARK SCHEMES Find past papers quickly by subject, year, session and variant. Open question papers alongside mark schemes and switch between them while practising. TOPICAL PRACTICE Stop endlessly searching through full papers just to practise one chapter. Practise MCQ and structured questions by topic, with filters for difficulty and other options to focus on exactly what you need to improve. INSTANT MCQ SOLVER Solve MCQ papers directly inside PaperStack and check your answers instantly. See your score, identify incorrect answers and review mistakes without manually checking every question against the mark scheme. PAPER MODE Want to practise like the real exam? Use Paper Mode for a focused, timed past-paper experience and track your performance as you complete papers. AI TUTOR & AI MARKING Stuck on a question? Get step-by-step AI explanations for MCQs and structured questions. For structured answers, PaperStack can evaluate your response against the marking scheme and help you understand where marks were gained or lost. MULTIPLAYER REVISION Challenge friends or students worldwide in real-time MCQ and structured-question matches, compare results and climb the leaderboards. TRACK YOUR PROGRESS Track completed papers, scores and performance over time, then revisit mistakes and weaker areas. SMART PDF VIEWER Built specifically for past-paper revision with: • Question paper and mark scheme viewing • Drawing and annotations • Night mode • Easy navigation • Saved and bookmarked papers • Offline access to downloaded resources SUBJECTS PaperStack includes resources across a wide range of IGCSE, O Level and A Level subjects including: Mathematics, Physics, Chemistry, Biology, Computer Science, Accounting, Economics, Business, English and many more. Whether you're preparing for your next class test or your final exams, PaperStack brings your past papers, topical practice, AI tools and revision tracking together in one place. Download PaperStack and make every past paper count. Disclaimer: All past papers, marking schemes, and related resources available on PaperStack are the intellectual property of Cambridge Assessment International Education (CAIE). PaperStack is an independent revision tool and is not affiliated with, endorsed by, or officially connected to CAIE or Cambridge University Press. We do not claim ownership of any exam content. While we work to keep all resources accurate and up to date, we make no guarantees regarding the completeness or correctness of any material. For official resources, visit cambridgeinternational.org. Privacy Policy: https://paperstack.cc/privacy.html Terms of Use: https://paperstack.cc/terms.html

Screenshots

O3 screens
PaperStack CAIE Past Papers4 screens

Verdict

The call

The clearest difference is update cadence: PaperStack CAIE Past Papers at weekly against O's every 29 months. On price, ads, in-app purchases 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

Both are free to download. O sells 2 in-app purchases, starting at $0.99 per 3 months and PaperStack CAIE Past Papers sells 4 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

O ships an update every 29 months, PaperStack CAIE Past Papers weekly. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

Scorecard1 real difference · 9 level
O versus PaperStack CAIE Past Papers: the parameters behind the verdict, then further details
ParameterOPaperStack CAIE Past Papers
PriceFreeFree
Rating—4.7 (3 ratings) — better
Positive reviews—50.0% of reviews
Number of ratings—3 — better
Update frequencyEvery 29 monthsWeekly — better
AdsYesYes
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.5 — better
Further details — not scored
Size76 MB93 MB
Age rating4+4+
DeveloperAlbert MungochiSalman Tariq

In-app purchases

2 purchases

O

Subscriptions2
  • Premium Quarterly$0.993 Months
  • Premium Annual$2.991 Year
4 purchases

PaperStack CAIE Past Papers

Subscriptions4
  • Premium Weekly$1.997 Days
  • Monthly Premium7 Days trial$3.991 Month
  • PaperStack Premium 6 Months$24.996 Months
Show 1 more
  • PaperStack Premium Yearly$39.991 Year

Questions

Is O free?
O is free to download, with in-app purchases available.
Is PaperStack CAIE Past Papers free?
PaperStack CAIE Past Papers is free to download, with in-app purchases available.
Do O or PaperStack CAIE Past Papers have ads?
Both O and PaperStack CAIE Past Papers show ads.
Which is updated more often, O or PaperStack CAIE Past Papers?
O ships an update every 29 months, and PaperStack CAIE Past Papers weekly. Most recently, O was updated on November 4, 2026 and PaperStack CAIE Past Papers on October 31, 2026.

Other comparisons