Comparison

PocketDSA vs Big O Notation

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

Head to head
About

PocketDSA

Features
Read full description

Crack your coding interview - 3 questions a day, 10 minutes, zero burnout. PocketDSA is built for engineers and CS students who want to land offers at Google, Meta, Amazon, Apple, and Microsoft โ€” without the overwhelm of grinding 300+ LeetCode problems at once. โ€” โ€” โ€” HOW IT WORKS Every day, you get 3 carefully curated DSA questions. You solve them. You move on. Over weeks, you build real interview readiness through consistency โ€” not cramming. โ€” โ€” โ€” WHAT YOU GET - Daily 3-Question Routine โ€” Finish in ~10 minutes. Build a streak. Stay sharp without burning out. - Company Packs โ€” Practice with actual interview questions from Google, Meta, Amazon, Apple, Microsoft and more. - AI Readiness Score โ€” After each session, get a concise score and actionable feedback on exactly what to improve next. - Progress Tracking โ€” See your mastery, weak spots, streaks, and improvement over time. - Privacy First โ€” We don't sell your data. Ever. โ€” โ€” โ€” WHY DAILY PRACTICE BEATS CRAMMING Research is clear: spaced repetition and consistent short sessions outperform marathon study sessions for retention and recall. PocketDSA is built around this principle โ€” small daily progress compounds into real interview confidence. โ€” โ€” โ€” PERFECT FOR - CS students preparing for internship or new grad interviews - Engineers targeting FAANG or top tech companies - Anyone who started LeetCode, burned out, and wants a sustainable approach - Busy professionals who only have 10โ€“15 minutes a day โ€” โ€” โ€” Start today. 3 questions. 10 minutes. One step closer to your dream job. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Big O Notation

Features
Read full description

Big O Notation is an independent study app for learning, reviewing, and practicing algorithm complexity. It is built for students, self-taught developers, coding interview candidates, and anyone who wants clearer intuition for time and space complexity. Study across Fundamentals, Practical Skills, Common Pitfalls, and Advanced Concepts with 160 focused questions. Every question includes an explanation so you can understand why an answer is right and where your reasoning went off track. Features: - FSRS spaced-repetition intervals for smarter review - Weak-point heatmap to spot topics that need attention - Daily challenge for steady practice - Mock exams for timed review - Offline practice - No login required Practice offline, no login required. Independent study app for Big O Notation practice. Not affiliated with, endorsed by, or sponsored by any company, certification body, exam operator, or vendor. All trademarks belong to their respective owners.

Screenshots

PocketDSA4 screens
Big O Notation4 screens

Verdict

The call

The clearest difference is in-app purchases: Big O Notation at none against PocketDSA's 2. On price, ads, device support and iOS requirement there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. PocketDSA sells 2 in-app purchases, starting at $3.99 per month. Big O Notation asks for nothing beyond the download.

Scorecard1 real difference ยท 5 level
PocketDSA versus Big O Notation: the parameters behind the verdict, then further details
ParameterPocketDSABig O Notation
PriceFreeFree
Update frequencyWeeklyโ€”
AdsNoNo
In-app purchasesYesNo โ€” better
DevicesiPhone, iPodiPhone, iPad, iPod โ€” better
Requires iOS15.115.1
Further details โ€” not scored
Size49 MB38 MB
Age rating4+4+
DeveloperAyusch JainAFTW LLC

In-app purchases

2 purchases

PocketDSA

Subscriptions2
  • PocketDSA Pro - Monthly$3.991 Month
  • PocketDSA Pro - Yearly$34.991 Year
None

Big O Notation

No in-app purchases

Questions

Is PocketDSA free?
PocketDSA is free to download, with in-app purchases available.
Is Big O Notation free?
Big O Notation is free to download, with no in-app purchases.
Do PocketDSA or Big O Notation have ads?
Neither PocketDSA nor Big O Notation shows ads.

Other comparisons