# Big O Notation — Practice Complexity Daily

> Practice Complexity Daily (iPhone/iPad app by Tsuyoshi Sezaki.)

- Source: https://appshunter.io/ios/app/big-o-notation/id6771656290 (this page in markdown: same URL + `.md`)
- Developer: [Tsuyoshi Sezaki](https://appshunter.io/developer/1886356149)
- Category: Education
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 38 MB
- Languages: American English
- Released: 2026-05-26
- Data updated: 2026-05-26
- User reviews in markdown: https://appshunter.io/ios/app/big-o-notation/id6771656290/reviews.md

## What is Big O Notation?

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.


## Version history (last 1 release)

### 1.0 — 2026-05-26

No release notes.

## More apps by Tsuyoshi Sezaki

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- [ケアマネ合格ドリル](https://appshunter.io/ios/app/id6761160881)

All apps by Tsuyoshi Sezaki: https://appshunter.io/developer/1886356149

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-26.*