Comparison

CodeFlash vs Jazz Theory

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

Head to head
About

CodeFlash

Features
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Code it. Remember it. Flash it! A casual flashcard app for memorizing small bits of code and syntax. It also works as a standard flashcard app, and it now reads your cards aloud — handy for language study too! [ Recommended for ] • Anyone learning programming • People who want to learn common syntax and patterns by heart • Anyone who wants to review on the go or in spare moments • Anyone looking for a personal flashcard app — vocabulary, code, or otherwise [ Features ] ■ Learn by writing code Type code into your cards and run it instantly to check the output. Supports JavaScript, TypeScript, Python, HTML, CSS, SQL, and C++ — learn by doing, not just reading. ■ Read your cards aloud Hear the side you are looking at. Sentences that mix writing systems are read with the right voice for each part, and you can pick the voice and the speed — handy for memorizing vocabulary or reviewing with your ears. ■ Create cards with 3 types of blocks Combine text, code, and image blocks freely. Text blocks support Markdown — headings, lists, bold, tables, and more. ■ Efficient spaced repetition learning The FSRS algorithm adjusts each card's next review to your understanding, for effortless, lasting memorization. ■ Track progress with stats and graphs See your study activity on a contribution graph, plus overall progress, deck mastery, and rating breakdown. ■ Works offline Your learning data is stored on your device (and in your own iCloud when sync is on) and is never sent to external servers. No account registration required. [ Great even on the free plan ] • No limit on the number of decks or cards • No ads • Export / import your data to move it to another device * Existing features will never be moved behind a paywall. [ What you get with Pro ] A one-time purchase. A 7-day free trial is available. • iCloud Sync: sync your data across devices on the same Apple ID. On a new device, just toggle it on to restore everything • HTML / CSS Preview: your code renders as a real page right inside the card. Go full screen to click buttons and type into inputs, or practice DOM manipulation from JavaScript. You can also register shared HTML and images on a deck • SQL / C++ Execution: register deck-wide setup SQL and query the same database from every card • Per-Deck Speech Language: set the reading language for each deck, and a different one for the front and the back • Detailed Statistics: monthly study volume, per-grade rankings (top 10), and per-card performance • Color Themes: 10 presets × light/dark to restyle your cards and the whole app • FSRS Customization: tune review intervals to your own pace — shorter for thorough review, or longer for relaxed learning • Study Timer: a countdown (1–60 min) that runs only while studying. Repeat it for Pomodoro [ Other Features ] • Card search, card duplication, and card transfer between decks • Organize with tags and study across decks • Shuffle cards to study • Set a daily card goal • Archive decks and cards (excluded from study and stats) • JSON export / import (full backup) • TSV export / import (card text and other partial data) • Daily reminder notifications • Dark mode • Bluetooth keyboard shortcuts • Available in English, Japanese, and Spanish • Available on both iPhone and iPad * Running HTML, CSS, SQL, and C++, and previewing JavaScript, are Pro features. Reading cards aloud is free. * Internet is required only for iCloud sync and running Python / C++ (Python loads its execution environment; C++ is sent to Wandbox, an external service — no account or personal info is included). Try the free version first!

About

Jazz Theory

Features
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毎日5分、ジャズ理論の「反射的理解」を目指す。 Jazz Theory は、ジャズアドリブに不可欠な音楽理論を、 ゲーム形式で習得するiOSアプリです。 【なぜこのアプリが必要か】 ジャズセッションやライブで即興演奏するには、 理論知識を「瞬時に使える状態」に定着させることが重要です。 単なる暗記ではなく、反射的に使えるレベルまで鍛えることで、 セッション中に「次に何を弾くか」を瞬時に判断できるようになります。 本アプリは、毎日5分のゲーム感覚のトレーニングで、 ジャズアドリブに必要な理論知識を効率的に定着させます。 【11段階のプログレッシブラーニング】 アプリは11個のステージで構成されており、 基礎から実践まで段階的に学習できます。 ■ 第1段階:スケール基礎(2ステージ) Stage 1: メジャースケール ドレミファソラシド = 明るく楽しい響き ジャズ理論の基本となるスケール このステージで「スケールとは何か」を理解します Stage 2: ナチュラルマイナースケール メジャースケールの6度から始めた音階 暗く悲しい響き、ジャズの基本スケール マイナーキーの即興に必須です ■ 第2段階:4大コード理論(4ステー

Screenshots

CodeFlash4 screens
Jazz Theory4 screens

Verdict

The call

The clearest difference is in-app purchases: Jazz Theory at none against CodeFlash's 1. CodeFlash's advantage is update cadence (weekly vs every 2 weeks) and iOS requirement (15.1 vs 18.0). On price, 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

Both are free to download. CodeFlash sells 1 one-off in-app purchase. Jazz Theory asks for nothing beyond the download.

UpkeepUpdate frequency

CodeFlash ships an update weekly, Jazz Theory every 2 weeks. The most recent releases landed on October 1, 2026 and September 11, 2026 respectively.

Scorecard3 real differences · 3 level
CodeFlash versus Jazz Theory: the parameters behind the verdict, then further details
ParameterCodeFlashJazz Theory
PriceFreeFree
Update frequencyWeekly — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.1 — better18.0
Further details — not scored
Size39 MB20 MB
Age rating4+4+
DeveloperJUN NISHIMOTOryusei kukita

In-app purchases

1 purchases

CodeFlash

One-time1
  • CodeFlash Pro$9.99
None

Jazz Theory

No in-app purchases

Questions

Is CodeFlash free?
CodeFlash is free to download, with in-app purchases available.
Is Jazz Theory free?
Jazz Theory is free to download, with no in-app purchases.
Do CodeFlash or Jazz Theory have ads?
Neither CodeFlash nor Jazz Theory shows ads.
Which is updated more often, CodeFlash or Jazz Theory?
CodeFlash ships an update weekly, and Jazz Theory every 2 weeks. Most recently, CodeFlash was updated on October 1, 2026 and Jazz Theory on September 11, 2026.

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