Free Online Dementia Tests: Which Are Actually Valid?

Search "dementia test online" and you will find dozens of options ranging from legitimate validated screening tools to quizzes that look more like personality tests than cognitive assessments. For a family member doing research at midnight, the question "which of these is actually real?" is harder to answer than it should be.

This is a clinician's short guide to what makes an online dementia test valid, which ones meet that bar, and the red flags that separate real screening tools from marketing.

What "validated" actually means

A cognitive test is validated when:

1. It has been tested in peer-reviewed research against a gold-standard clinical assessment.
2. Its sensitivity (how often it correctly identifies people with cognitive impairment) and specificity (how often it correctly clears people who don't have it) are documented and reasonable.
3. It has been used across diverse populations — different ages, education levels, languages — with known performance characteristics.
4. The scoring is transparent and consistent between administrations.

The gold-standard comparisons vary by purpose. A brief screening tool is compared against a longer comprehensive neuropsychological evaluation. A longer test is compared against clinical diagnosis plus follow-up.

Crucially, "used by doctors" does not automatically mean validated, and "validated in research" does not automatically mean appropriate for self-administration at home. The important question for online tests is whether the tool keeps its validity when it leaves the clinic.

The brief screening tools that are real

These are the instruments clinicians actually use, described briefly. Our MMSE vs Clock Drawing Test vs MoCA comparison goes into more detail on each.

Clock Drawing Test

• Takes about three minutes
• Public domain (no license required)
• Sensitive to executive dysfunction and visuospatial problems
• Usable online with validated scoring when implemented carefully
• Can be taken at home or in a clinic

Mini-Cog

• Takes about three minutes
• Combines a three-word recall with a clock drawing
• Validated across languages and education levels
• Usable online in a properly implemented form
• Trademarked by its developers

MMSE (Mini-Mental State Examination)

• Takes about ten minutes
• Widely historically used
• Copyrighted since 2001, requires licensed administration
• Not ideal for self-administration due to scoring nuances and copyright
• Still useful as a longitudinal tracking tool in a clinical setting

MoCA (Montreal Cognitive Assessment)

• Takes about 10–15 minutes
• More sensitive to mild cognitive impairment than the MMSE
• Since September 2020, requires administrator certification
• Not intended for self-administration; online versions without certification lack validity

SLUMS (Saint Louis University Mental Status Examination)

• Takes about seven minutes
• 30-point scale, free to use
• Less commonly administered online, more often in clinical settings

What a valid online test should do

A legitimate online screening tool, at minimum:

• Names the instrument it is based on (Clock Drawing Test, Mini-Cog, SLUMS, etc.)
• Cites the original research or validation studies
• Scores transparently — you can see how the score was calculated
• Discloses its limitations — specifically, that it is a screening tool, not a diagnosis
• Points to a clinical next step rather than offering a diagnosis
• Protects your data with a clear privacy policy
• Does not require payment for the core screening (paid-only dementia tests should raise immediate suspicion)
• Does not promise a personalized "brain age" or similar marketing-coded metric that isn't a clinical measure

Red flags that suggest a test is not valid

• No citation of the underlying instrument or research
• Branded terminology ("Memory Quotient," "Brain Age," "Cognitive Score") without a reference to a known clinical measure
• Results framed as diagnosis ("You may have mild Alzheimer's") rather than as screening
• Upsells after the test — paid full reports, supplement recommendations, subscription unlocks
• Generic quiz format with multiple-choice questions about lifestyle, diet, or general knowledge — these are not how cognitive screens work
• No information about data handling — especially concerning for anything health-related
• No clinician involvement or review of content
• Claims of "AI-powered" detection without citing the model, training data, or validation

What to look for in an online clock drawing test specifically

The clock drawing test is one of the few brief cognitive screens that actually works well online, because the core task — drawing — is inherently visual and can be reasonably captured on a touchscreen or with a mouse. A good online CDT should:

• Use the standard instruction ("draw a clock, put in all the numbers, set the time to ten past eleven")
• Provide a clean drawing surface with enough space
• Use a validated scoring system (Shulman, Mendez, Rouleau, or Royall CLOX)
• Ideally allow clinician review of the drawing itself, not just the number score
• Return the drawing to you so you can bring it to a doctor

For a deeper look at the scoring systems, see The Clock Drawing Test: Complete Scoring and Interpretation Guide.

A note on the Tokei Health test

Full disclosure: we built one of these. The clock drawing test at app.clockdrawingtest.com uses the standard clock instruction, validated scoring principles, and returns both the drawing and the score to the person who took it. It is free, requires no account to start, and is designed to be shown to a clinician rather than to replace one.

We mention ours because we think clinician-built, validated, transparent online screens are what this space should look like. Other tools on the web that match those principles — clear citations, validated instruments, transparent scoring, honest framing — are worth trusting too. Tools that don't match those principles are worth skipping.

What an online screening result means, and doesn't

A result from a valid online screening tool is one data point in a larger clinical picture. It is useful for:

• Establishing a baseline to compare against in the future
• Catching a concern early so you can bring it to a clinician
• Quieting a worry when the result is clearly normal
• Documenting a pattern if results drift over time

It is not useful for:

• Replacing a clinical evaluation
• Diagnosing a specific condition
• Ruling out dementia in someone with persistent concerns
• Making medical decisions independently

If you've been using a test you're not sure about

A practical move: write down the name of the test you took, the score it gave you, and when. Bring it to your next primary care appointment. A clinician can tell you quickly whether the instrument is one they would rely on, and what it suggests in your specific context.

Related reading

• The Clock Drawing Test: Complete Scoring and Interpretation Guide
• MMSE vs Clock Drawing Test vs MoCA: Which Cognitive Screening Should You Take?
• What to Do After a Low Clock Drawing Test Score
• Early Signs of Dementia vs Normal Aging

References

• Borson S, Scanlan J, Brush M, Vitaliano P, Dokmak A. The Mini-Cog: a cognitive "vital signs" measure for dementia screening in multi-lingual elderly. International Journal of Geriatric Psychiatry. 2000;15(11):1021–1027.
• Nasreddine ZS, Phillips NA, Bédirian V, et al. The Montreal Cognitive Assessment, MoCA: a brief screening tool for mild cognitive impairment. Journal of the American Geriatrics Society. 2005;53(4):695–699.
• Shulman KI. Clock-drawing: is it the ideal cognitive screening test? International Journal of Geriatric Psychiatry. 2000;15(6):548–561.

---

Disclosure: Dr. Shimada is the founder of Tokei Health. This article is informational and is not a substitute for individual medical advice from your own clinician.