Sharpen your mind
    for the age of AI.

    Stop outsourcing your thinking to AI. Start training it.Analyze real articles, spot weak arguments, think more clearly!

    10 minutes a dayExpert-built questionsTrack your progress

    The problem

    AI is making us more productive. Research suggests it may be making us less sharp.

    43%
    of users struggle to judge AI output quality - fluent, confident-sounding answers often hide errors, gaps, or subtle bias.
    IE University · 2025
    ↓ 55%
    less brain connectivity
    MIT study found LLM users showed reduced brain connectivity vs. those writing without AI assistance
    MIT · 2025
    35%
    report difficulty keeping pace with AI-driven change - especially as roles, workflows, and team norms keep shifting.
    IE University · 2025
    ↓ Critical thinking
    with regular AI use
    A peer-reviewed study found a strong negative correlation between AI tool frequency and critical thinking scores.
    Gerlich · Societies, MDPI · 2025
    The Reasoning Gap
    As AI capability accelerates, human cognitive skills are falling behind
    AI capability
    Cognitive skills
    With deliberate practice
    The gapAI capabilityCognitive skillsWith deliberate practice2020202220242026
    thessea closes this gap
    Daily deliberate practice on real content keeps cognitive skills sharp as AI advances.
    ↑ With deliberate practice, the gap narrows

    How it works

    The AI dependency loop, and how to break it

    The loop
    1. 1You use AI to read, summarise, and draft. It feels faster.
    2. 2You do less of the reasoning yourself.
    3. 3Under pressure, exams, interviews, meetings… the support disappears.
    4. 4You feel behind, so you rely on AI even more.

    and the cycle restarts

    The break
    1. 110 minutes a day on real material: news, articles, real content.
    2. 2You work through the reasoning yourself: claims, evidence, conclusions.
    3. 3Feedback shows where your reasoning held up and where it broke down.
    4. 4Over time, you build clarity under pressure.

    See how we break the loop in practice

    Real articles. Real arguments. Skills you keep under pressure.

    Active Reading · Live Mode
    Live Reading2:14 remaining
    How AI Changes the Way We Evaluate Information
    Generative AI systems can produce highly fluent text that appears authoritative, even when its claims lack supporting evidence.
    This creates a fundamental literacy challenge: the surface quality of writing no longer signals the depth of reasoning behind it.
    A 2024 Stanford study found that 68% of professionals could not distinguish AI-generated analysis from expert-written reports when both were well-formatted.
    The implication is clear - reading comprehension now requires active reasoning, not passive absorption.
    Question 2 of 5
    Based on the text so far, what is the most significant implication of the Stanford finding?
    AAI writing is always unreliable
    BFormat quality is no longer a proxy for reasoning quality
    CProfessionals need more AI training
    DExpert reports are becoming obsolete
    Correct! The Stanford finding directly shows that well-formatted AI text is indistinguishable from expert writing - meaning format quality no longer signals reasoning depth.
    2 / 5
    Core feature

    Read actively, not passively

    Text appears sentence by sentence. Questions pop up as you read - testing inference and reasoning in real time. No scrolling back. No passive highlighting.

    • ✓Sentences appear one at a time - forces active engagement
    • ✓Questions test inference, not memory recall
    • ✓Immediate CER feedback after each answer
    • ✓Difficulty adapts to your performance
    Skill Analytics

    Track how your skills improve
    over time

    Every exercise feeds your personal skill profile. See exactly where you're growing, where you're plateauing, and what to practice next - backed by data, not guesswork.

    🕸️

    6-axis skill radar - Visualise your reasoning fingerprint across causal reasoning, argument structure, evidence evaluation, and more.

    📈

    Weekly delta tracking - See whether your accuracy improved or declined compared to last week, down to the individual skill.

    🎯

    Personalised next steps - The dashboard surfaces what to practice based on your weakest skill and current trajectory.

    See how it works

    Skills

    Causal Reasoning74%
    Argument Structure50%
    Assumption Detection0%
    Evidence Evaluation58%
    Claim Calibration46%
    Reading69%
    Causal74%Argument50%Assumption0%Evidence58%Calibration46%Reading69%

    Skill Detail

    🔬Evidence Evaluation
    Developing
    Accuracy58%
    TrendImproving ↗
    Attempts15
    Avg Response2.5 min
    7d Change+8.4%
    Next LevelDifficulty III
    Mastery
    58%

    🎉 Great work - Evidence Evaluation improved 8.4% this week. Keep the momentum going!

    Practice Evidence Evaluation →Try Daily Card instead

    Why thessea

    Not another brain game

    Brain games
    thessea
    Real-world content
    ✕
    ✓
    Skills transfer to work
    ✕
    ✓
    CER-based feedback
    ✕
    ✓
    Measurable reasoning gains
    ✕
    ✓
    Progressive difficulty
    ✓
    ✓
    Under 10 min/day
    ✓
    ✓

    Join the beta.

    Start training your skills today!

    No spam. No brain health claims. Just 10 minutes a day.