IQ Prep vs IQ Test Challenge
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
IQ Prep
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Practise for IQ tests with the item types of real intelligence tests: matrices, number series, figure series, mirror images, operators and digit span. Plus a lab with reaction, attention and memory tasks in which you measurably improve with practice. For aptitude tests, Mensa admission and anyone who wants to know how IQ tests work. IQ TEST ITEMS • Matrices: 3×3 figure matrices as in Raven's test, up to four rules at once, and at higher levels dot patterns that combine, intersect or cancel out • Number series: 28 rule families, from simple differences to interleaved series • Figure series: rotation, count, fill, shape and movement across the grid • Mirror images: rotated or mirrored, with ever-new figures • Operators: insert the operators, precedence applies • Digit span: forwards and backwards, as in the Wechsler test Every item is generated fresh, on five difficulty levels, and after every answer you see the solution step by step. No games, no points: items look like the real test, black figures on a plain background, no animations. LAB: REACTION, ATTENTION, MEMORY Five classic tasks from cognitive psychology to practise: reaction time, Stroop, flanker, Corsi block and dual n-back. With practice you measurably improve at them; a trend curve shows your progress, plus a daily streak. Reaction, attention and memory are tested directly in some selection procedures, such as police or pilot selection. TEST UNDER REAL CONDITIONS 30 items from all categories, 20 minutes, no help until the end. Then a score per category and every wrong item with its solution to work through. SCIENTIFIC BASIS • Practice on the test format measurably improves scores. The meta-analysis by Hausknecht et al. (2007) shows gains of about a quarter of a standard deviation from retesting, more with targeted coaching. • Practising reaction and memory tasks reliably improves performance on exactly those tasks. Whether it transfers to IQ beyond them is disputed (Melby-Lervåg et al. 2016), so IQ Prep does not promise it. • The item types follow established test families: matrices after Raven, digit span after Wechsler (WAIS, WISC), number and figure series as in CogAT and similar batteries. Free to try: three items per category, one full test with mistake review, and three runs of each lab task. Full version $4.99 one time: everything unlimited. No subscription, no ads, no account, no data collection. Training offline, internet only for purchase and restore. IQ Prep is not a standardized intelligence test and does not measure IQ.
IQ Test Challenge
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How smart are you – compared to everyone else? IQ Test Challenge is a free IQ test and brain training app with classic intelligence puzzles. After every test you see where you stand among all players. With the Club membership you also see where you stand among people like you, by country, age group, gender and education. THE IQ TEST Ten tasks across the classic categories, getting harder as you go. No time limit – think as long as you like. At the end you review your answers, submit them and see your score, your IQ estimate with its range and your percentile on the distribution curve of all players. Then go through every task with its solution – Club members also get an explanation for each one. SEVEN CATEGORIES OF CLASSIC PUZZLES - Patterns: matrices, figure series - Numbers: number series, number grids - Spatial: cube nets, rotation vs. mirror image - Memory: figure grids, n-back - Logic: syllogisms, seating plans - Words: analogies, odd word out - Speed: symbol search, colour-word test Every puzzle is generated fresh – you will not run out of tasks. EXAM PREPARATION Practise for aptitude tests, employment tests and entrance exams: 21 tasks from all seven categories, 20 minutes, no feedback between the tasks – like a real test. Afterwards the error analysis shows your gaps per category compared with other players, and you train exactly there. One exam per week is included; with the Club membership it is unlimited and comes with your history. A practice simulation, not an official test. BRAIN TRAINING WITH A REAL COMPARISON Brain training that shows you where you really stand: train memory, logic, numbers, patterns, spatial thinking, words and speed, and compare yourself with real players instead of only with your own past scores. The weakness analysis builds a brain training session from your weakest task types. With the Club membership: a training plan with your progress per category and unlimited training. COMPARE YOURSELF The comparison is the heart of the app. See how your result compares with the whole community. With the Club membership you also see how many players solve each task and which answer others picked. Your data stays anonymous: no account, no sign-up, and your profile details are optional. MORE WAYS TO PLAY - Daily challenge: five tasks, the same for everyone in the world, with a daily ranking - Sudden death: one task after another, one mistake ends the run. With leaderboards worldwide, per country and per week (with Club membership) - Duel: challenge friends with a code – same five tasks, who scores more? - Training: brain training for a single category, without a score - Statistics: your strengths and weaknesses per category, history and IQ estimate over all tests FREE, NO ADS The IQ test, brain training and all game modes are free and without ads: three IQ tests on your first day, then one test and one sudden death run per day. The Club membership (monthly or yearly) unlocks more: explanations for every task, up to five IQ tests a day, unlimited sudden death, duels and training, the sudden death leaderboards, how many players solve each task and which answer others picked, your percentile in every comparison group, all details of your past tests and a crown in the rankings – and you support the further development of the app. The subscription renews automatically and can be cancelled at any time in your store account settings. Note: IQ Test Challenge is made for entertainment and self-assessment. It is not a clinical or diagnostic intelligence test. Privacy policy: https://challenge.iqtest-app.de/privacy-policy-app/ Terms of use: https://challenge.iqtest-app.de/terms-and-conditions/ License agreement (Apple standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: IQ Prep at every 2 days against IQ Test Challenge's every 4 days. IQ Test Challenge's advantage is device support (3 vs 1). On price, ads, in-app purchases and iOS requirement 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
Both are free to download. IQ Prep sells 1 one-off in-app purchase and IQ Test Challenge sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
IQ Prep ships an update every 2 days, IQ Test Challenge every 4 days. The most recent releases landed on October 31, 2026 and November 13, 2026 respectively.
| Parameter | IQ Prep | IQ Test Challenge |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 days — better | Every 4 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 30 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Codefellas GmbH | Paul Stelzer |
In-app purchases
IQ Prep
- Full version$3.99
IQ Test Challenge
- Club Monthly$1.991 Month
- Club Yearly3 Days trial$8.991 Year









