Harvard
Executive-function research: attention and self-control are built through practice, not fixed at birth.
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Daily detox
Detox your focus before the scroll gets to it first.
Exercises
Standalone Exercises
Working Memory
N-Back
Train position, color, shape, and audio matching with adaptive N-back sessions.
Fluid Reasoning
Relational Reasoning (RRT)
Spatial premise training for abstract logic and mental model building.
Cognitive Control
Cognitive Control Training (CCT)
Adaptive serial addition for focus, inhibition, and mental endurance.
Inhibition
Inhibitory Control (ICT)
Respond quickly to go cues, then withhold your response when a stop signal appears.
Spatial Memory
Grid Memory
A pattern of tiles flashes on the grid — reproduce it from memory. It grows each level.
Spatial Memory
Sequence Memory
Numbers appear across the board, then vanish — tap the squares in order from memory.
Working Memory
Number Recall
A number flashes, then you type it back. One more digit is added every round.
Verbal Memory
Word Memory
Words appear one by one — mark each as new or already seen. The list keeps growing.
Processing Speed
Reaction Time
Wait for the screen to turn green, then tap as fast as you can. Five trials, averaged.
Adaptive test
Cogni IQ Test
A computer-adaptive assessment across memory, reasoning, and processing speed — each answer picks the next question.
Adaptive test
Cogni IQ Test
The test adapts to you: each answer picks the next question. Most sessions take 10–25 minutes and finish in 20–35 questions.
- Find a quiet spot and don't use a calculator or notes.
- Each question has its own timer — an unanswered question counts as incorrect.
- You can't go back to earlier questions.
- Don't refresh or close the app; if it happens, the test resumes where you left off.
Scores are estimates from provisional item data, for personal tracking only — this is not a clinically validated IQ test.
Question 1
Fluid reasoning
Cogni
IQ Test
Your score
100
95% CI 92–108
- Fluid reasoning
- –
- Verbal comprehension
- –
- Quantitative reasoning
- –
Estimates come from provisional item parameters and sharpen as the item bank is calibrated with real data. Not medical or diagnostic advice.
Keep training your mind
Your IQ isn't fixed — it sharpens with practice. Explore the rest of Cogni, free.
Cogni IQ Test
Previous scores
Saved on this device only. Item-level responses are kept for future calibration.
Self-report
OCD Test
Self-report
OCD Test
18 statements about checking, contamination, order, intrusive thoughts, rituals, and saving. Rate how much each applied over the past month.
This is a self-report screening signal, not an official OCD test, medical advice, or a diagnosis.
1 of 18
Checking
Self-report screen
OCD screen complete
Low
A simplified read of these answers. It is not an official OCD test or diagnosis.
This result is a screening signal only. Consider discussing persistent, distressing, or time-consuming symptoms with a qualified clinician.
Attention
Focus Test
Attention
Focus Test
Digits flash one at a time. Tap for every digit — except 3. When you see a 3, do nothing. It measures sustained attention and impulse control.
Takes about a minute. Stay with it — the rhythm makes it easy to slip.
1 / 45
Attention
Focus score
0
- Accuracy
- –
- Missed taps
- –
- Taps on 3
- –
- Median reaction
- –
Working memory
Memory Test
Working memory
Memory Test
Tiles light up one after another. Repeat the sequence by tapping the tiles in the same order. Sequences get longer until you miss twice in a row.
Takes about three minutes. Your span is the longest sequence you repeat correctly.
Span 2
Watch the sequence…
Working memory
Memory span
0
- Sequences correct
- –
- Longest sequence
- –
Self-report
ADHD Assessment
Self-report
ADHD Assessment
45 questions across attention, hyperactivity, impulsivity, and functional impact.
This is a self-report screening tool, not an official ADHD test, medical advice, or a diagnosis.
Self-report history
Previous scores
Saved on this device only.
1 of 45
This is a self-report screening tool, not an official ADHD test, medical advice, or a diagnosis.
Inattention
Self-report screen
Assessment complete
Low
A simplified read of these answers. It is not an official ADHD test or diagnosis.
- Inattention
- 0 / 18
- Hyperactive / impulsive
- 0 / 21
- Functional impact
- 0.0 / 4
This result is a screening signal only, not an official ADHD test, medical advice, or a diagnosis. Consider discussing persistent symptoms or impairment with a qualified clinician.
Coming Next
Section
This area is reserved for the next production system.
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Add each new digit to the digit immediately before it.
- Correct
- 0
- Wrong
- 0
- Interval
- 5.0
- Time
- 5:00
Feedback will appear here.
Timer
30
sec
Mixed
2pPress Start.
Premises
Conclusion
Conclusion will appear here.
Feedback will appear here.
- Hits
- 0
- Misses
- 0
- False alarms
- 0
- D-prime
- 0
- Correct
- 0
- Misses
- 0
- False alarms
- 0
- Speed
- 0.25
Feedback will appear here.
●
Center
Peripheral Target
- Correct
- 0
- Wrong
- 0
- Duration
- 900
- Accuracy
- 0%
Feedback will appear here.
+
Press Start
STOP
- Go correct
- 0
- Stops
- 0
- Failed stops
- 0
- SSD
- 250
Feedback will appear here.