The tests
Which test is right for you?
All four measure fluid reasoning with original problems: no vocabulary, no trivia, nothing that can be looked up. They differ in format, timing and the part of the scale where they measure best.
Online · adaptive · untimed
THETIS
About 30 puzzles chosen for your level by item response theory. Your IQ, percentile, seven facet scores and a certificate the moment you finish. May be retaken, with new puzzles every time.
Take THETISOnline · timed
RUFIT
36 original figures, one at a time, 35 or 60 seconds each, scored with a published norm. An instant IQ and certificate, and admission to two societies. One attempt.
Take RUFITPaper · untimed · gifted range
QUADRAVA-FR
40 constructed-response problems in four sections, for about IQ 125 to 170. Solve at your own pace and send your answers for scoring.
Explore QUADRAVA-FRPaper · untimed · extreme range
PROTEUS
40 problems of laws that hide, change and travel, precise to about IQ 185 and scaled to a nominal 250. The summit.
Explore PROTEUS
Side by side
| THETIS | RUFIT | QUADRAVA-FR | PROTEUS | |
|---|---|---|---|---|
| Format | Online, adaptive multiple choice | Online, multiple choice (8 options) | Paper, constructed answers | Paper, constructed answers |
| Problems | 20–45 (about 30) | 36 | 40, in four sections | 40, in six worlds |
| Time | Untimed (25–45 minutes typical) | 35 or 60 seconds per question (about 29 minutes) | Untimed | Untimed |
| Best range | About IQ 65–220, scale to 250 | Norm IQ 115–190 (observed to 169) | About IQ 122–173 | About IQ 136–184, nominal 250 |
| Scoring | Instant, item response theory | Instant, published norm | By the author, within 14 days | By the author, within 14 days |
| Fee | US$19.99 per session | US$50, including a society application review | US$30 scoring fee | US$30 scoring fee |
| Certificate | PDF, verifiable online | PDF, verifiable online | Score report by email | Score report by email |
| Retakes | Yes, new puzzles every time | One attempt | One attempt | Form B retest after six months |
| Societies | All four | Nereid, Aphotic | Nereid | All four |
Choosing in one minute
- You want your IQ today, at any level: THETIS. Its practice module shows every puzzle type first.
- You think fast and want a clock: RUFIT, the timed test, with norms published in 2021.
- You are gifted and new to high-range tests: QUADRAVA-FR.
- You want the hardest test there is: PROTEUS, untimed, for as long as it takes.
- You want to join a society: see the admission criteria; THETIS may be retaken until you qualify.
Two measures are better than one. Each test measures with a margin of error. Taking two different tests, for example THETIS and RUFIT, or THETIS and PROTEUS, gives a firmer picture of where your reasoning stands than any single score.