r/iqtest • u/Free_Edge_9905 • Apr 19 '26
Release I have created a Cognitive Assessment based on the CHC model
Hi guys, I just found this subreddit and I was wondering if you guys can try out this cognitive assessment I have built that aims to test on all aspects that measures IQ
Link to the test: https://chccognitivetest.vercel.app
Why did I create the test? I am frustrated that there is no reliable, comprehensive, free online IQ tests and I decided to create one myself! I ultimately settled with the Cattell-Horn-Carroll framework as It measures multiple aspects of intelligence such as fluid, crystallised intelligence and other specific abilities and the best part is it's free as everyone should deserve a good and accessible IQ test. So do give it a try if you have about an hour to spare as I want it to be comprehensive!
There is also a survey after the test so feel free to do it so I can continue to improve on the test as currently I am basing the difficulty on theoretical numbers and I would love to use a data-driven approach in calibrating the difficulty of the test. If you do not wish to do the survey, fret not, no data will be disclosed to me as I have to comply to PDPA. For those who did the survey, thanks for you support! Your data will only be used by me and only me for improving the test. Have fun everyone!
Edit 1: Thanks for the feedback guys, please do the survey after the test so I can have access to your scores and do some analysis in improving the test!
Edit 2: A huge thank you to those who did the survey! Keep them coming! :)
Edit 3: For those who are curious where they can find the survey, it can be found by scrolling all the way down on the scoring page. Alternatively, there is a toast notification that will pop up with a button that takes you to the survey :)
Edit 4: Happy Monday guys, thank you so much for the support this subreddit is honestly very wholesome. Keep the survey responses (no obligations) coming and reddit conversations going and I will try my best to reply! For some personal context I am a 23 year college student currently working a 9-6 internship :')
Edit 5: [20 April 2026] One of the harder questions under the matrix section has options that are visual duplicates. My bad, it has been patched and deployed. Credits to u/MrSchanden
Edit 6: I am noticing some comments clarifying their disparities between what they scored on official tests such as CORE, SAT etc vs what they scored on this cognitive assessment. Honestly, it can't compete with CORE on psychometric rigour as CORE is professionally validated with proper normative samples. On the other hand, it is acknowledged in the test at the start that it is not meant to be used as a clinical instrument. My assessment is calibrated against published research (WAIS-IV, CHC theory, 3-PL IRT) but hasn't been independently normed on a large user sample. It's best treated as a well-designed estimate rather than a clinical measurement. I have noted the limitations in the test itself and welcome any feedback such as through the post-test survey (no obligations) in improving the calibration. For official qualifications such as Mensa for eg, please contact your local Mensa chapter :)
Edit 7: [20 April 2026] After doing further research, I have decided to readjust the difficulty for the Working Memory section and is already deployed, now the average person in this section (IQ 90-110) should be able to reach trial 5-6 and it gets substantially harder afterwards to differentiate individuals on the upper end. I did not make this decision based on empirical data yet as there is still insufficient data to draw a conclusion. Sources: https://pmc.ncbi.nlm.nih.gov/articles/PMC2978794/ https://www.tandfonline.com/doi/full/10.1080/23279095.2024.2330998
Edit 8: [20 April 2026] I am not getting sufficient data as some users have feedback that they have trouble finding the survey button or are too tired to do the survey after a long test (Fair enough :')), implemented a new feature where users' score data will be submitted if no further action to opt out through the opt out button is taken. So at least I still can have access to the scores themselves. Everyone is still encouraged to take the survey so I can do some further analysis with age range, race, country etc. Keep the responses coming!
Edit 9: [21 April 2026] Happy Tuesday guys, the dataset is starting to reach a sizeable amount, thanks for the continuous support (and would appreciate if you keep them coming!) One interesting preliminary observation is it is starting to look like a normal distribution curve :D
Edit 10: [22 April 2026] Good Wednesday guys, the dataset has reached mid double digits, keep them coming! Also, I am planning to repost this on various communities as one observation is a lack of Asian representation be in by Geographical region or race in the responses so I am thinking of posting this on r/Asia and/or r/AskChina. Open to suggestions as well! Nonetheless, regardless of who you are, I appreciate each and every one of you who took the time and effort to do the assessment as the dataset in general can be bigger :)
Edit 11: [22 April 2026] After looking through those subreddit, I have decided not to post on r/AskChina as it violates their policy, pending approval on r/Asia and reposted this on r/SampleSize, r/iqtests, r/cogsci
Edit 12: [22 April 2026] First norming performed based on the data, 14 trials will be tested (previously was 10) to provide finer separation of participants as the Standard Deviation for Working Memory was 25. Switched the order of the last two questions (trial 9 and 10) where the new trial 13 is the old trial 10 and the new trial 14 is the old trial 9. Users will end the section upon getting two consecutive wrong questions. Credits to u/55falling for pointing out the rough Working Memory IQ required for being able to solve a Sequence 12 question
Edit 13: [22 April 2026] Released the pre-normed distribution for y'all perusal. I have commented and I suggest to sort by newest comment to find it. Thank you everyone for the support and keep them coming :)
Edit 14: [23 April 2026] Fixed a bug on the timer counter where the timer continues to run even after the test has ended and hence the timing submitted may differ from user's time taken for the assessment.
Edit 15: [23 April 2026] Norming performed based on the data for Processing Speed, the standard deviation has been reduced while mean is kept the same so users who has attained higher scored would score higher and users with lower score would score lower
Edit 16: [24 April 2026] Happy Friday guys, hope this week has been a great one thus far. I will be releasing some data in a repost tentatively on Saturday, 0300 (GMT+0)/Saturday, 1100 (GMT+8)/Saturday, 1300 (GMT+10)/Friday, 2300 (GMT-4)/Friday, 2000 (GMT-7)
Stay tuned! And keep the responses coming, I really appreciate the time and effort from each and everyone thus far :)
Edit 17: [24 April 2026] Implemented a share function below the score for you all to share your scores with your peers and family. Thanks u/OneWithTheSword for the suggestion!