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Free brain tests you can take right now: reaction time, memory span, attention, typing and click speed. One honest number per test, and what it does not mean.

Website, pricing, platforms and company facts side by side.
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| Website | opalstack.com | cognitivedrill.com |
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What each product offers, as listed by its team.


Possible disadvantages
No features have been listed yet.
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
No analysis of CognitiveDrill yet.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Opalstack and CognitiveDrill.
CognitiveDrill's answer:
(Note: Since CognitiveDrill is a free, sign-in-free web platform for general users, you can list the primary user segments instead)
Competitive esports players and gamers tracking reaction speed
Students and professionals benchmarking memory and typing performance
Self-quantifiers and productivity enthusiasts tracking daily cognitive performance
CognitiveDrill's answer:
CognitiveDrill focuses strictly on honest, precision measurement rather than inflated brain-training claims. It starts timing the millisecond a stimulus renders on the screen, throws out cheap guesses (<100ms), uses median scoring to eliminate luck, and benchmarks results directly against real reference distributions.
CognitiveDrill's answer:
Unlike platforms that charge subscriptions or make exaggerated claims about increasing intelligence, CognitiveDrill is 100% free, requires zero sign-in, and offers over 40 fast, sub-two-minute laboratory tests focused purely on accurate benchmarking and personal tracking.
CognitiveDrill's answer:
Gamers, student athletes, developers, productivity enthusiasts, and anyone looking to track baseline cognitive metrics—such as reaction time, digit span, and processing speed—using precise, no-nonsense tests.
CognitiveDrill's answer:
It was built out of frustration with online brain-training tools that lock simple tests behind paywalls and market unproven claims about "brain age." CognitiveDrill was created as a lightweight, accessible alternative to deliver honest, accurate cognitive benchmarks directly in the browser.
CognitiveDrill's answer:
Modern Web Stack (HTML5, CSS3, JavaScript/TypeScript), HTML5 Canvas API, and Web Audio API for precise millisecond-level stimulus rendering and timing.
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