Brain health and cognitive assessment tools.
A companion for your cognitive life. A collection of free tools for understanding your thinking, sleep and brain health, including adult ADHD and autism traits. Each one draws on published research, documents its method and limits, and scores your answers in your browser. A result leaves your browser only if you save it or buy its report.
The Brain Lab is a collection of eight free, research-documented brain tests: brain age, adult ADHD, adult autism, cognitive performance, cognitive reserve, chronotype, sleep need, and sleep–cognition. Every test gives instant results, scores your answers in your browser, and requires no sign-up; a result leaves your device only if you save it or buy its report.
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.
Last reviewed
Measure what matters — then change it.
Each tool stands on its own and documents its method. Inputs are scored in your browser. Results travel only as far as you choose to send 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 sets out a personalized 24-hour schedule. Computes social jetlag, the tool's own regularity estimate, and—when paired with the LBL Chronotype Profile—your biology-behavior gap. Grounded in Roenneberg 2003 (MSFsc), Wittmann 2006 and Arab 2024 (social jetlag), and Phillips 2017 (sleep regularity).
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 the meta-analyses behind each domain. 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 drawing on chronobiology research — Jones 2019 GWAS (n=697,828), Taillard 2004 age calibration, and modern chronotype-DLMO research. Continuous 0–100 score adjusted for age and sex, with an estimated DLMO window.
Adult ADHD Test
A free ~7-minute test 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 self-inventory, not a validated screen or 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. Its age ranges are provisional, and the test is not validated. 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 self-inventories, not validated screens. They organize your experience into notes 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 times you on short tasks for attention, memory, speed and flexibility, and scores them against provisional age ranges. The Cognitive Reserve Test asks the longer question: how much protective buffer has your life built against brain aging, across six domains drawn from the research? Sleep sits between them. The Sleep Need Calculator shows the recommended sleep range for your age and your sleep debt (the essay Why "Eight Hours" Is the Wrong Question explains why the folk number misleads). The Sleep–Cognition Optimizer looks at your sleep timing and turns it into a schedule, with an estimated window for hard work. The Chronotype Test shows whether your body clock leans morning or evening.
"I'm worried about memory decline — mine or a parent's."
This is the decline intent, and here is the honest answer: 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 a 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 Test records the life experiences that research on cognitive reserve counts, and the sleep tools look at how much sleep you need and how your sleep timing fits your day. Neither detects anything, and neither is a forecast — 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 here documents its methodology, its sources, and its limits, on its own page or a linked methodology 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.
Grounded in published research
Each tool names the research it draws on, in journals like The Lancet, Alzheimer's & Dementia, Nature and Sleep Medicine Reviews, and says where it relies on its own design choices, such as author-chosen score bands. Cited inline, not hidden.
Documented methods
Each tool documents its method on its own page or a linked methodology page. Several carry a LifeByLogic identifier, such as LBL-BAI for the Brain Age Index and LBL-CRE for the Cognitive Reserve Estimator. If you want to challenge our weights, cite our method or redo our arithmetic, the steps are written out in plain language.
Sent only if you choose
Every calculation runs in your browser, and nothing you enter is sent to show you a result. A result leaves your browser only if you choose to save it to a free LifeGraph+ account or buy its report, and a report gets only what it needs to be written. You can check this in your browser's developer network tab while using any tool.
Read the methodology.
Each tool documents its method on its own page or a linked methodology page: what it measures, how it is scored, its limits, whether it has been validated, and the research it draws on.
2024 Lancet Commission framework, 14 modifiable risk factors, scoring algorithm.
Mid-sleep (MSFsc) and social-jetlag computation, the regularity 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 12 sections.
14-item LBL-original framework, 0–100 continuous scoring adjusted for age and sex, 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, and a pressure contrast), the age-adjustment and scoring pipeline, the Brain Vitality Age, provisional norms, limitations, and references.
Other laboratories in the publication.
LifeByLogic is organized into five labs, each focused on a different part of life.
Crossroads Lab
Free career tools: whether to quit your job, whether to change careers, which kinds of work interest you, and how you create value at work.
Behavior Lab
Cognitive psychology and behavioral science tools, including the Cognitive Bias Test and the Big Five Personality Test.
Life Dashboard
Free tools for flourishing, meaning in life, attachment, loneliness, depression, and stress and burnout.
Family Lab
Free, research-informed tools for parents: family routines, child temperament, screen balance, strengths, milestones, and parent-child connection.
More tools may follow for this lab, but none has a release date yet. Follow The Brain Matters for updates.
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/.
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title = {Brain Lab: Free Cognitive and Brain Health Tests},
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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
Most tests here have a companion essay that explains the science behind them: 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) from short timed tasks.
You want your brain’s modifiable age — the part of brain aging you can actually change, from 25 health and lifestyle 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 see how your sleep timing lines up with your day — and how to fix the schedule.
You want to know whether your body clock leans morning or evening — so you can plan your day around it.
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: ADHD and autism often occur together, so consider taking both. Read Why Adult Autism Goes Unrecognized.
Optimize your week
Payoff: a concrete schedule that puts your hardest work inside your sharpest hours.
- Take the Chronotype Test to see whether your body clock leans morning or evening.
- 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's tools look at everyday thinking skills like attention and memory, brain-aging risk factors, cognitive reserve, sleep need and timing, and adult ADHD and autism traits. They draw on published research, but most use LifeByLogic's own questions or adapted tasks, and none is a validated clinical instrument.
Can these tests diagnose ADHD or autism?
No. The Adult ADHD Test and Adult Autism Self-Inventory are structured self-report inventories, not validated 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 careful self-inventory can do is turn a vague “something has always been different” into specific, discussable notes.
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 a free option, and a clinician can administer a MoCA. What this lab offers on brain aging is upstream: the Cognitive Reserve Test records the life experiences that research on cognitive reserve counts, and the sleep tools look at how much sleep you need and how your sleep timing fits your day. Neither detects anything, and neither is a forecast.
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, how your sleep timing fits your day, 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?
No. The tools have not been through journal peer review. They draw on peer-reviewed research, such as the 2024 Lancet Commission on dementia prevention and chronotype studies in journals like Chronobiology International and Nature Communications, and each tool lists its sources on its own page or its methodology page. The tools whose pages name a reviewer 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 self-assessments. They draw on published research, but none has been validated as a clinical instrument, and they 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 documents its method on its own page or a linked methodology page. We show the items or variables measured, how the score is computed, any reference data (or that there is none), the known limits, and the sources. Most methodology pages also keep a version log of significant changes.
Do my answers stay private?
Yes. Brain Lab tests score your answers in your browser, and none needs an account. A result leaves your browser only if you choose to save it to a free LifeGraph+ account or buy its report, and a report gets only what it needs to be written. We never sell your responses. See our Privacy Policy for full details.