Comparison

Fast Math vs Decodey

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

Head to head
About

Fast Math

Engage in quick, enjoyable mental math exercises and puzzles to sharpen your cognitive skills. Compete with others, track your progress, and unlock new challenges as you advance through various difficulty levels.

Highlights
  • Daily 3-minute brain training sessions
  • Variety of math and memory puzzles
  • Competitive duels and tournaments
  • Adaptive difficulty levels
  • Progress tracking and stats
  • Multiple question types
Features
Read full description

Train your brain with fast, fun math — a few minutes a day. Fast Math turns brain training into a game: quick mental math, addictive puzzles like Cross Math and Sudoku, memory challenges, and duels and tournaments against opponents at your level. DAILY WORKOUT • A 3-minute session mixing speed, accuracy and memory • Build a streak and keep your mind sharp every day GAMES FOR EVERY MOOD • Cross Math — fill interlocking equation grids without mistakes • Sudoku — the classic 9×9, simple or hard • Rush 60 — 60 seconds, chain answers for combo points • Survival — 3 lives, questions get faster and faster • Memory & Pairs — remember numbers, match hidden cards • Geometry — train your visual brain COMPETE • 1v1 duels matched to your exact level • 8-player tournaments with a live leaderboard • Duel record, win rate and best finishes in your stats PRACTICE THAT GROWS WITH YOU • 12 question types: mental math, chain calculations, percentages, missing operators, number sequences, patterns, equations, powers & roots, true/false, dominoes and memory • Difficulty adapts as you level up — from Beginner to Legend across 30 levels TRACK YOUR PROGRESS • Score trends, accuracy, streaks and rank points • Every mode counts toward your level FAST MATH PREMIUM • Unlimited daily sessions • All 12 question types • Full stats history • Subscribe weekly, monthly or yearly — or pay once with Lifetime Access and unlock everything forever Whether you want to sharpen your mental math, wake your brain up in the morning, train for an IQ test, or just beat your friends — Fast Math makes it fun. Download now and start your streak today. Subscription details Fast Math Premium is available as a weekly, monthly or yearly auto-renewing subscription, or as a one-time lifetime purchase. Payment is charged to your Apple Account at confirmation. A subscription renews automatically unless cancelled at least 24 hours before the end of the current period; manage or cancel it in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://focus-reset-b6f40.web.app/privacy-policy

About

Decodey

Features
Read full description

Ever come across a word like "cache", "VPN", "algorithm" or "chatbot" and just nodded along without really knowing what it meant? Decodey is for you. One new tech word, every day — explained in plain English that anyone can understand. No background in technology needed. Every word comes with: • A plain-English meaning you'll actually remember • A real-life example showing it in context • A "Did you know?" fact to make it stick • Pronunciation help and what abbreviations stand for FEATURES • A new word every day — 365 in total, a full year of learning • Practice mode: hide the meaning and test yourself first • Browse and search all 365 words by topic or difficulty level • Save your favourites and build a daily learning streak • Works fully offline — no internet needed, your data stays on your device • A gentle daily reminder at whatever time suits you best From the internet and online safety to AI, social media and everyday computing — Decodey turns confusing tech into something friendly, one small word at a time. Perfect for students, professionals, parents, or anyone who wants to feel a little more at home with technology.

Screenshots

Fast Math4 screens
Decodey4 screens

Verdict

The call

The clearest difference is in-app purchases: Decodey at none against Fast Math's 10. Decodey also leads on iOS requirement (15.1 vs 17.0). 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. Fast Math sells 10 in-app purchases, starting at $3.99 per month. Decodey asks for nothing beyond the download.

Scorecard2 real differences · 8 level
Fast Math versus Decodey: the parameters behind the verdict, then further details
ParameterFast MathDecodey
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 9 days—
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad, Mac — betteriPhone, iPod
Requires iOS17.015.1 — better
Further details — not scored
Size9 MB32 MB
Age rating4+4+
DeveloperYoussef ZiatKritesh Singh

In-app purchases

10 purchases

Fast Math

Subscriptions5
  • Fast Math Pro Monthly$3.991 Month
  • Fast Math Pro Weekly3 Days trial$4.997 Days
  • Fast Math Monthly$4.991 Month
Show 2 more
  • Fast Math Pro Yearly$14.991 Year
  • Fast Math Yearly$19.991 Year
One-time5
  • 500 Coins$2.99
  • 1500 Coins$6.99
  • 4000 Coins$14.99
Show 2 more
  • Fast Math Pro Lifetime$29.99
  • Lifetime Access$29.99
None

Decodey

No in-app purchases

Questions

Is Fast Math free?
Fast Math is free to download, with in-app purchases available.
Is Decodey free?
Decodey is free to download, with no in-app purchases.
Do Fast Math or Decodey have ads?
Neither Fast Math nor Decodey shows ads.

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