Both offer a free IQ test; neither is clinical. BrainMetrix pairs a quick free test with a library of brain-training games; DesperateMinds adds a percentile, a domain profile, and paid AI-evaluated reasoning tiers from $19.99. Pick by what you want to learn.
BrainMetrix and DesperateMinds both hand you a free IQ score, which is why they get compared. But they're built for different people. BrainMetrix is, at heart, a brain-training playground with an IQ test attached; DesperateMinds is an assessment platform with a free tier and paid, open-ended reasoning tests on top. Choosing well means knowing which of those you actually came for.
One quick note before the comparison, because the naming is genuinely confusing: this page is about BrainMetrix (brainmetrix.com), the long-running free brain-training and IQ site. Several look-alikes — "Brain Metrics Initiative," various "certified" clones, and assorted subscription sites — are entirely separate businesses with paid models. They are not the same thing, and it's worth checking the exact address before you enter any payment details anywhere.
At a Glance
Want a free score with a percentile and a per-domain breakdown, not just a number? The free DesperateMinds IQ test gives all three instantly, with no email required.
Two free tests, two missions
The cleanest way to tell these apart is by what the rest of the site is for.
BrainMetrix is an educational website dedicated to brain training. Its free IQ test sits alongside memory exercises, concentration drills, reflex games, and other cognitive activities. The IQ test is the on-ramp; the games are the destination. If you enjoy the idea of testing your score and then poking at brain puzzles for fun, that whole ecosystem is free.
DesperateMinds is an assessment platform. Its free test exists to give you a real screening estimate — a score, a percentile, and a domain breakdown — and its paid tiers go deeper into how you reason rather than adding games. The two sites share a free IQ test but diverge sharply on either side of it. For the baseline both are measured against, our guide to a real, legitimate IQ test lays out what any test needs to be trustworthy.
What BrainMetrix actually is
BrainMetrix offers a short, free, multiple-choice IQ test that returns an instant score. The items lean on familiar formats — number series, verbal questions, simple math, and pattern completion — the kind of mixed battery common to quick online tests. There's no email wall on the core test and no charge to see your result.
Its bigger identity is as a brain-training hub. The site bundles the IQ test with a collection of free games and exercises aimed at memory, attention, and reasoning, positioning itself as somewhere to both check and "train" your cognition. That's a legitimate, well-established niche — but, as the science section below explains, "train your brain" claims deserve a careful reading. Like most free tests, BrainMetrix publishes little formal norming or reliability data, so its score is best read as a rough estimate.
What DesperateMinds actually is
DesperateMinds' free test is roughly 30 questions in about 20 minutes, covering verbal and non-verbal reasoning, and it returns a score on the standard scale (mean 100, SD 15) with a percentile and a per-domain breakdown — all instantly, in the browser, with no email required.
Its paid tiers are where it diverges most from a games-oriented site. The Advanced test ($19.99) spans 100 questions across six domains with AI-evaluated open-response tasks, and CMIAS ($34.99) uses 56 open-ended questions across seven cognitive dimensions — including novel problem solving, cross-domain transfer, uncertainty calibration, and speed of updating — scored by AI rather than multiple choice. Where BrainMetrix invites you to play, DesperateMinds invites you to reason on the page. Neither is a clinical instrument.
The free tiers head-to-head
This is the fairest place to compare them, since both are free here. BrainMetrix gives you a quick score and then a room full of brain games to explore — great if casual, exploratory testing is the goal. DesperateMinds gives you a score plus a percentile and a domain profile, which is more useful if you want to understand where your reasoning is strong or weak rather than just a single figure.
Neither free tier qualifies you for a high-IQ society, and neither is clinical. If your priority is simply a no-friction free number, our roundup of free IQ tests with instant results covers what to watch for — email walls, paywalled scores, and inflated numbers — across the wider field.
More Than a Number — A Full Reasoning Profile
If a single score isn't enough, CMIAS maps seven dimensions of reasoning through open-ended questions and returns a radar-chart profile. A flat $34.99, one time, no games to grind and no subscription.
Explore CMIAS →Full comparison
Only publicly verifiable facts are included on each side; rows aren't guessed where a detail isn't published.
| Feature | BrainMetrix | DesperateMinds |
|---|---|---|
| Cost | Free | Free; Advanced $19.99; CMIAS $34.99 |
| What it is | Free IQ test + brain-training games hub | Free test + paid AI-evaluated assessments |
| Test content | Number series, verbal, math, pattern completion | Verbal + non-verbal (free); open reasoning (paid) |
| Question format | Multiple choice | Multiple choice (free) + typed open answers (paid) |
| Result | Instant IQ score | Instant score + percentile + domain profile |
| Brain-training games | Yes — a core feature | No — assessment-focused |
| Paid depth | Core test is free | Flat one-time paid tiers |
| Clinical validity | No (screening estimate) | No (screening estimate) |
The honest bottom row is the same for both: screening estimates, not clinical results, best read as a range of roughly ±10 points. For where genuinely clinical testing sits and what it costs, see our full IQ test cost breakdown.
About those brain-training games
Because brain-training games are central to BrainMetrix, it's worth being straight about what they do. The intuition is appealing: play memory and reasoning games, get smarter. The evidence is more sobering.
A landmark 2010 study in Nature put more than 11,000 people through six weeks of brain training and found that people improved at the specific tasks they practised — but that improvement did not transfer to untrained cognitive abilities. A comprehensive 2016 review reached a similar verdict: the strongest claim the evidence supports is that you get better at the trained games, with little reliable carry-over to general intelligence or everyday performance. In other words, brain-training games can be genuinely fun and can sharpen a narrow skill, but they are not a proven route to a higher IQ.
None of this is a knock on BrainMetrix specifically — it's the state of the science for brain training in general. It simply means the games are best enjoyed as games. If raising cognitive performance is your real aim, our evidence-based guide to how to increase IQ and our deeper look at brain training and IQ cover what actually moves the needle.
Accuracy and honest limits
Neither platform is a clinical test, and both should be read as screening estimates. As our deeper piece on how accurate online IQ tests really are explains, a self-administered test's accuracy comes down to how it's built and the conditions you take it in — not the brand on the page.
What can be said fairly: both give a score on the standard scale, and both, like nearly all free tests, publish limited formal reliability data. DesperateMinds adds a percentile and domain breakdown to its free result; BrainMetrix keeps things simpler and pairs the test with games. Take either after a poor night's sleep or in a noisy room and the number will shift. The sensible reading of any single online score — from either site — is a range, not a verdict.
Which should you choose?
Match the tool to what you actually want:
- You want a quick free score and some casual brain games to play with. BrainMetrix is a natural fit, and it's fully free.
- You want a free score with a percentile and a per-domain breakdown, no email. DesperateMinds' free test is built for that.
- You want to see how you reason in your own words, not just pick answers. DesperateMinds' Advanced or CMIAS tiers use open-ended, AI-evaluated questions.
- You mainly want to "train" your brain. BrainMetrix has the games — just hold realistic expectations about transfer to general IQ.
- You need a documented, defensible score. Neither — book a supervised, clinician-administered test.
If you're comparing across the wider field, our head-to-heads on DesperateMinds versus 123test and DesperateMinds versus Mensa round out the picture.
Where DesperateMinds fits
Placed honestly next to BrainMetrix: DesperateMinds isn't trying to be a brain-training arcade. BrainMetrix does the free-test-plus-games experience well, and for a lot of people that casual mix is exactly right. DesperateMinds' distinct contribution is depth on the assessment side — a percentile and domain profile on the free tier, and open-ended, AI-evaluated reasoning tests on the paid tiers — for people who want to understand how they think, not just get a number and a game to play.
Both are free to start, and neither replaces a clinician. The choice comes down to one question: do you want to test-and-play, or test-and-understand? BrainMetrix leans to the first, DesperateMinds to the second — and that's the honest line between them.
Test and Understand — Free, No Email
Take the free DesperateMinds test for an instant score, percentile, and domain breakdown. It's the honest first step toward knowing not just your number, but where your reasoning is strong.
Take the Free IQ Test →Frequently asked questions
Is BrainMetrix free?
Yes. BrainMetrix (brainmetrix.com) offers a free online IQ test with an instant score, alongside a library of free brain-training games and memory exercises. There is no paywall on its core IQ test. Note that several similarly named sites — such as Brain Metrics Initiative and various "certified" clones — are separate businesses with paid or subscription models; they are not the same as BrainMetrix.
Is BrainMetrix a real, accurate IQ test?
BrainMetrix is a legitimate, long-running free brain-training and IQ website, and its test gives a quick screening estimate. Like most free online tests, it publishes little formal norming or reliability data, so the result is best treated as a rough range of roughly plus or minus 10 points rather than a precise figure. It is not a clinical substitute for a psychologist-administered assessment.
Do brain-training games increase your IQ?
Mostly no. Large studies, including a 2010 Nature study of over 11,000 people and a 2016 comprehensive review, found that brain-training practice improves the specific trained tasks but shows little reliable transfer to general intelligence or everyday cognition. Brain-training games are engaging and can sharpen a particular skill, but they are not a proven way to raise your underlying IQ.
Is DesperateMinds better than BrainMetrix?
Neither is simply better; they aim at different things. BrainMetrix is ideal if you want a quick, entirely free score plus casual brain-training games. DesperateMinds is aimed at people who want a percentile and a domain profile, or a deeper open-ended reasoning assessment on its paid tiers. Choose based on whether you want a fast free number and games, or a structured profile.
What is the difference between BrainMetrix and DesperateMinds?
BrainMetrix is a free IQ test bundled with a brain-training games hub; its focus is casual testing and cognitive exercises. DesperateMinds is an assessment platform: a free test that reports a percentile and domain breakdown, plus paid tiers (Advanced and CMIAS) that use open-ended, AI-evaluated questions instead of multiple choice. One leans toward games, the other toward reasoning profiles.
Can BrainMetrix or DesperateMinds qualify you for Mensa?
No. Mensa accepts only supervised, proctored tests or professionally administered prior evidence. Neither BrainMetrix nor DesperateMinds — nor any unproctored online test — can qualify you for membership, whatever score it reports. They are useful for self-knowledge and as a rough pre-check, not for society admission.
Which free IQ test is best?
The best free test is the one that matches your goal and is honest about its limits. If you want games plus a quick score, BrainMetrix is a strong free option. If you want a percentile and a per-domain breakdown with no email, DesperateMinds' free test fits. Either way, treat a single online score as a range, and use a supervised test if you need a documented result.
References
- BrainMetrix (brainmetrix.com). Free IQ Test and Brain-Training Games (free online IQ test; memory and cognitive exercises).
- Owen, A. M., Hampshire, A., Grahn, J. A., Stenton, R., Dajani, S., Burns, A. S., Howard, R. J., & Ballard, C. G. (2010). Putting brain training to the test. Nature, 465(7299), 775–778.
- Simons, D. J., Boot, W. R., Charness, N., Gathercole, S. E., Chabris, C. F., Hambrick, D. Z., & Stine-Morrow, E. A. L. (2016). Do "brain-training" programs work? Psychological Science in the Public Interest, 17(3), 103–186.
- Condon, D. M., & Revelle, W. (2014). The International Cognitive Ability Resource: Development and initial validation of a public-domain measure. Intelligence, 43, 52–64.
- Wechsler, D. (2024). Wechsler Adult Intelligence Scale — Fifth Edition (WAIS-5). Pearson.
- DesperateMinds. (2026). CMIAS Assessment (seven-dimensional open-ended cognitive assessment methodology).