Brain health and cognitive assessment tools.
A companion for your cognitive life. A growing collection of evidence-based tools for understanding and optimizing cognitive performance, sleep, memory, and mental health. Each instrument is built on peer-reviewed neuroscience and runs entirely in your browser. Nothing is stored.
The Brain Lab is a collection of seven free, research-documented brain tests: adult ADHD, adult autism, cognitive performance, cognitive reserve, chronotype, sleep need, and sleep–cognition. Every test gives instant results, runs entirely in your browser, and requires no sign-up — your answers never leave your device.
They are educational self-assessments, not diagnoses — and honest about scope: these are not IQ tests and not dementia screens. If you're worried about memory decline, see the FAQ below for where to go instead; if you're curious how your brain actually works, you're in exactly the right place.
Measure what matters — then change it.
Each tool is a standalone research-grade instrument. Inputs stay local. Results travel only as far as you choose to share them.
Brain Age Test
The Brain Age Index estimates the modifiable portion of your brain-age gap across 6 evidence-based domains (25 items) — built on the 2024 Lancet Commission on Dementia Prevention and MRI Brain Age Gap research from the UK Biobank.
Sleep Schedule Calculator
Measures your behavioral sleep patterns and prescribes a personalized 24-hour schedule. Computes social jetlag, Sleep Regularity Index estimate, and—when paired with the LBL Chronotype Profile—your biology-behavior gap. Grounded in Roenneberg 2003 (MSFsc), Arab 2024 (SJL), and Windred 2023 (SRI mortality evidence).
Sleep Need Calculator
How much sleep do you need by age? Built on AASM and National Sleep Foundation consensus guidelines, with weekly sleep debt and a lifespan view across nine age brackets.
Cognitive Reserve Test
Six-domain estimator of accumulated cognitive reserve. Synthesized from Stern's framework, the Cognitive Reserve Index questionnaire, Verghese's NEJM leisure research, the 2024 Lancet Commission, and 100+ underlying studies. Evidence-weighted scoring with full provenance documented on the tool page.
Chronotype Test
Find your biological/trait chronotype with a 14-item LBL-original assessment grounded in 2019–2025 chronobiology — Jones 2019 GWAS (n=697,828), Taillard 2004 age calibration, and modern chronotype-DLMO research. Continuous 0–100 score, age-sex calibrated, with estimated DLMO window.
Adult ADHD Test
A free ~7-minute screen using the LBL Adult ADHD Symptom Inventory (v2.0), a 20-item LBL-original inventory across three domains: attention & executive function, hyperactivity & impulsivity, and emotional self-regulation. Returns a tri-domain profile, severity bands, and one of 7 research-grounded archetypes mapping pattern to evidence-based pathways. A screen, not a diagnosis.
Adult Autism Test
A free ~8-minute adult autism self-inventory using the LBL Adult Autism Self-Inventory (v2.0), a 30-item LBL-original instrument across four trait constructs (social-cognitive, sensory, routine & repetition, focus & depth) plus masking and emotional-processing context indices. Returns a trait profile, four resonance bands, and one of six lens profiles. A self-inventory, not a diagnosis.
Cognitive Performance Test
A free ~14-minute live cognitive performance test. Seven short tasks — adapted from established paradigms (Corsi span, Eriksen flanker, Symbol–Digit, task-switching, paired-associate) — measure seven domains and translate them into your Brain Vitality Age and a cognitive archetype. An optional report turns your scores into a personalized written analysis. A performance snapshot, not a diagnosis.
Already completed the Brain Age Test? Preview the personalized Brain Blueprint report →
Which brain test should you take first?
People arrive at free cognitive tests carrying one of three questions, and the honest answer to "which test?" depends entirely on which question is yours. Here is the routing, stated plainly.
"Something about my attention, focus, or social wiring has always been different."
This is the screening intent, and it has two doors here. If the lifelong pattern is losing focus, starting-but-not-finishing, time slipping away, and restlessness that follows you between jobs and relationships, start with the Adult ADHD Test — a structured self-inventory of the adult presentation that so often goes unnoticed (the companion essay, Why Adult ADHD Goes Undiagnosed, explains why). If the pattern is instead social decoding by conscious effort, sensory overwhelm, and a deep need for routine and special interests, start with the Adult Autism Test. Both are screens in the proper sense: they organize your experience into evidence you can take to a clinician — they do not replace one.
"I want to know how my brain is performing — and what I can change."
This is the performance intent. The Cognitive Performance Test profiles the everyday machinery — attention, memory, processing, flexibility — as you actually experience it. The Cognitive Reserve Test asks the longer question: how much protective buffer has your life built against brain aging, across the six domains the research says matter? Between them sits the most underrated lever in cognitive science: sleep. The Sleep Need Calculator establishes what your brain actually requires (the essay Why "Eight Hours" Is the Wrong Question explains why the folk number misleads), and the Sleep–Cognition Optimizer maps what your current sleep is doing to tomorrow's thinking. The Chronotype Test tells you when that brain does its best work — the cheapest performance upgrade on this page is scheduling hard work inside your biological peak.
"I'm worried about memory decline — mine or a parent's."
This is the decline intent, and here is the honesty that most "free brain test" pages skip: nothing in this lab screens for dementia, and we won't pretend otherwise. Validated self-administered options exist — the SAGE exam from Ohio State is the standard free one, and a clinician can administer a MoCA — and genuine memory concern deserves a doctor, not a website. What this lab honestly offers on the aging question is upstream: the Cognitive Reserve Estimator and the sleep tools measure the modifiable protective factors identified by the 2024 Lancet Commission on dementia prevention. That is prevention work, not detection work — a distinction we'd rather state than blur.
How to take any of them well
Structured self-report has one failure mode: answering as the person you'd like to be. Answer as the person you were this month. Take tests rested and uninterrupted, treat a surprising score as a hypothesis rather than a verdict, and re-test on a cadence that can actually show change — a baseline now, again in three to six months, or after a deliberate intervention like fixing your sleep. Every tool below documents its methodology, its sources, and its limits on the page — the receipts are one click away, which is exactly how you should judge any free cognitive test, including ours.
How Brain Lab tools are built.
Three commitments shape every instrument in this laboratory. Without them, none of this matters.
Peer-reviewed sources only
Every factor, every weight, every recommendation traces back to published research in journals like The Lancet, Alzheimer's & Dementia, Nature, or Sleep Medicine Reviews. We cite explicitly — no vague "studies show" language.
Named methodology
Each tool publishes its full methodology under a unique identifier (LBL-BAI, LBL-SCO). If you want to challenge our weights, cite our method, or reproduce our calculations — every step is documented in plain language.
Zero data retention
Every calculation runs locally in your browser. Nothing you enter is sent to our servers, stored, or tracked. You can verify this by opening your browser's developer network tab while using any tool.
Read the methodology.
Each tool publishes its full methodology under its own page — the validated framework, the variables measured, the algorithm, the limitations, and the peer-reviewed references behind every claim.
2024 Lancet Commission framework, 14 modifiable risk factors, scoring algorithm.
Mid-sleep (MSFsc) and social-jetlag computation, Sleep Regularity Index estimate, 24-hour schedule logic, validation strategy, and references.
AASM and NSF consensus statements, scoring algorithm, validation studies, score band rationale, and limitations.
Six-domain construction, scoring algorithm pseudocode, validation strategy, score-band derivation, and limitations documented in 11 sections.
14-item LBL-original framework, 0–100 continuous scoring with age-sex calibration, estimated DLMO window, validation strategy, and limitations.
20-item LBL-original inventory, three domains (attention, hyperactivity, emotional self-regulation), 4 severity bands, 7 archetypes, validation roadmap and limitations documented in full.
30-item LBL-original instrument, four trait constructs plus masking and emotional-processing context indices, four resonance bands, six lens profiles with salience-based routing, scoring algorithm, validation roadmap and limitations documented in full.
Seven cognitive paradigms (Corsi span, Eriksen flanker, Symbol–Digit, task-switching, paired-associate, within-session RT drift), the age-adjustment and scoring pipeline, the Brain Vitality Age, provisional norms, limitations, and references.
Other laboratories in the publication.
LifeByLogic is organized into four labs, each focused on a different dimension of the examined life.
Crossroads Lab
Monte Carlo simulators and multi-variable calculators for life's biggest forks — career, education, relocation.
Behavior Lab
Behavioral economics and cognitive psychology tools to detect biases, build better habits, and resist manipulation.
Life Dashboard
Your wellbeing self-reflection engine. Track sleep, mood, spending, and productivity — and surface the patterns hiding in plain sight.
More evidence-based tools are in active development for this lab. Follow The Brain Matters to hear when they ship.
APA (7th ed.) — LifeByLogic. (2026). Brain Lab: Free cognitive & brain health tests. LifeByLogic. https://lifebylogic.com/brain-lab/
MLA (9th ed.) — LifeByLogic. "Brain Lab: Free Cognitive & Brain Health Tests." LifeByLogic, 2026, lifebylogic.com/brain-lab/.
Chicago (17th ed.) — LifeByLogic. "Brain Lab: Free Cognitive & Brain Health Tests." LifeByLogic, 2026. https://lifebylogic.com/brain-lab/.
@misc{lifebylogic2026brainlab,
author = {{LifeByLogic}},
title = {Brain Lab: Free Cognitive and Brain Health Tests},
year = {2026},
howpublished = {\url{https://lifebylogic.com/brain-lab/}}
}
Free guides to how your brain actually works
Long-form, research-cited essays behind our free cognitive tests — ADHD, autism, sleep, and brain aging, written to be read, shared, and cited. No sign-up, ever.
Browse all essays in the Learn library →How the Brain Lab connects
Every test here has a companion essay that explains the science behind it — take the test for your numbers, read the essay to understand them. Grouped by what brought you here.
Lifelong trouble with focus, follow-through, and time that follows you between jobs and relationships.
Social decoding by conscious effort, sensory overwhelm, a deep need for routine and depth over small talk.
You want a read on everyday cognition — memory, attention, processing speed, mental flexibility — as you actually experience it.
You want your brain’s modifiable age — the part of brain aging you can actually change, from 17 evidence-based factors.
You want your long-game buffer against decline — how much protective cognitive reserve your life has built.
You’re not sure how much sleep you actually need — and suspect “eight hours” is the wrong target.
You want to know what your current sleep is doing to tomorrow’s thinking — and how to fix the schedule.
You want to know when your brain does its best work — so you can schedule hard tasks inside your biological peak.
Three ways to use the Brain Lab
The tests are more useful in sequence than in isolation. Pick the journey that matches your goal — each threads a few tests and their essays into a path with a payoff at the end.
Understand a lifelong pattern
Payoff: turn “something has always been different” into specific, discussable evidence you could take to a clinician.
- Read Why Adult ADHD Goes Undiagnosed to see if the pattern fits.
- Take the Adult ADHD Test — or the Adult Autism Test if the pattern is social and sensory.
- Cross-check overlap: many adults screen for both. Read Why Adult Autism Goes Unrecognized.
Optimize your week
Payoff: a concrete schedule that puts your hardest work inside your sharpest hours — the cheapest performance gain on this site.
- Take the Chronotype Test to find your biological peak hours.
- Run the Sleep Need Calculator — then read Why “Eight Hours” Is the Wrong Question.
- Use the Sleep–Cognition Optimizer to turn it into a schedule.
Protect your brain for the long game
Payoff: a personalized map of the brain-aging factors you can still change — prevention, not panic.
- Get your baseline with the Brain Age Test; read What Is Your Brain Age.
- Estimate your buffer with the Cognitive Reserve Test.
- Target the modifiable factors — read 17 Factors That Age Your Brain and fix sleep first.
Frequently asked questions.
What does the Brain Lab measure?
The Brain Lab houses tools that surface signals about cognitive health, brain aging, sleep–cognition relationships, memory, and attention. Each tool implements a validated instrument or framework from the peer-reviewed neuroscience and cognitive aging literature.
Can these tests diagnose ADHD or autism?
No. The Adult ADHD Test and Adult Autism Self-Inventory are structured self-report screens: they organize your lifelong patterns into a profile you can examine and, if warranted, take to a professional. A formal diagnosis involves a clinical interview, developmental history, and differential diagnosis by a qualified clinician — a process no online test replaces. What a good screen does is turn a vague “something has always been different” into specific, discussable evidence.
Is this a memory or dementia test?
No — and we state that rather than blur it. Nothing in the Brain Lab screens for dementia or mild cognitive impairment. If memory decline is the concern, the SAGE exam (Ohio State's validated self-administered test) is the standard free option, and a clinician can administer a MoCA. What this lab offers on brain aging is upstream: the Cognitive Reserve Estimator and the sleep tools measure the modifiable protective factors identified by the 2024 Lancet Commission — prevention work, not detection work.
How often should I retake a brain test?
Establish a baseline now, then re-test in three to six months — or after a deliberate change like fixing your sleep, since that's a window in which real movement can show. Retaking weekly mostly measures noise and mood. For stable-trait tools (chronotype, the ADHD and autism inventories), expect results to hold steady; meaningful change there usually reflects a changed life situation, not a changed brain.
What's the difference between these tests and an IQ test?
IQ tests measure timed problem-solving ability against population norms. Brain Lab tools measure something different: your cognitive patterns, traits, and risk-and-protective factors — how your attention behaves, what your sleep is doing to your thinking, how much reserve your lifestyle has built. Ability and pattern are complementary questions; if you want a proper IQ measure, that requires a psychometrically normed instrument, which free online quizzes (ours included) are not.
Are the Brain Lab tools peer-reviewed?
The methodologies the tools implement are peer-reviewed. Sources include the 2024 Lancet Commission on dementia prevention, the chronotype research literature in the journal Sleep, and cognitive performance studies from PNAS and Nature Mental Health. The tools themselves are independently reviewed for analytical correctness by Eskezeia Y. Dessie, PhD (Indiana University School of Medicine).
Are the tools clinical instruments?
No. The Brain Lab tools are educational decision-support tools. They surface signals based on validated research instruments but do not diagnose any cognitive or medical condition. They are not a substitute for evaluation by a licensed healthcare professional. If you are concerned about your cognitive health, please consult a qualified provider.
How are results calculated?
Each tool publishes its complete methodology on the tool page. We disclose the items measured, the scoring procedure, the reference data used for benchmarking, the limitations, and the citations. Tools are versioned; significant methodology updates change the tool version and are logged in the methodology section.
Do my answers stay private?
Yes. Brain Lab tools run locally in your browser. Your inputs are not transmitted to our servers. We do not collect, store, or sell your responses. See our Privacy Policy for full details.