Practice number series, matrices and figure logic with step-by-step solutions, by item type or as a timed test. The item types of real tests, generated fresh every time. No brain training.
Free to try: one item per category and one full test. Full version $4.99 one time. No subscription, no ads, no account, no data collection.
Real items from the app’s generators. Tap to solve.
Black figures on a plain background, no confetti, no animations, no points. Real tests look exactly this plain. Practice this way and nothing feels unfamiliar on test day.
24 rule types, from simple differences to three interleaved series.
3×3 figure matrices in the Raven style with up to four simultaneous rules. Elimination method
Rotation, count, fill and shape change by fixed rules.
Rotated or mirrored. Spatial reasoning under time pressure.
Insert the operators, precedence applies, unique solution guaranteed.
Forwards and backwards, as in the Wechsler test.
30 items, 20 minutes, no help. Score per category and comparison with earlier runs.
Reaction time, Stroop, flanker, Corsi block, dual n-back. Milliseconds instead of points, with a trend and a daily streak.
In full, with sources: Can you train your IQ? What the research says
What the meta-analyses on n-back, brain training and practice effects actually show.
Aptitude test preparationThe item types, a strategy for each, and how to manage the clock.
How to solve matrix reasoningThe four rule types behind every Raven matrix, with the elimination method.
Apps for IQ test preparation comparedBrain training, free IQ tests, portals, test practice. What is good for what.
Average reaction timeNormal values, what affects them, and the link to intelligence.
CogAT, NNAT and WISC for parentsWhen preparation makes sense and what it looks like.
No. IQ Prep is test preparation. The app drills the item types found in intelligence and aptitude tests and reports results as percent correct and as a comparison with your own earlier runs. It is not normed and does not output an IQ score.
Studies on practising a test format show gains of several points in test performance (Hausknecht et al. 2007). There is no study of IQ Prep itself. According to current research, training does not change the underlying intelligence, so IQ Prep promises no IQ gain.
The reasoning section of aptitude tests used by employers, public agencies, police and military, Mensa admission tests, selection procedures such as CogAT and NNAT, and tests of the Raven and Wechsler families. The item types are the same across these tests.
The app is free to try: one item per category, one full test with mistake review, reaction time and Stroop in the lab. The full version with unlimited items, tests and the whole lab is a one-time purchase of $4.99. No subscription, no ads.
No. The app needs no account and contains no analytics or tracking components. Training works offline; internet is needed only for the full-version purchase and its restore through Apple or Google. Results are stored only on the device.
Practically never. All items are generated from rules and random values, the number of possible combinations runs into the millions, and the generator avoids showing the same rule type twice in a row. A repeat is not impossible.
The nonverbal items suit children from about eight, with a parent following the explanations. The store age rating is 4+ because the app has no problematic content.
English, German, Spanish, French, Italian, Portuguese, Dutch, Polish, Turkish and Russian. The items themselves are language-independent; the interface, explanations and instructions are translated.
IQ Prep is developed by Codefellas, a software company in Germany. Contact: birger.krah@codefellas.io. IQ Prep is not a standardized intelligence test and does not measure IQ.