Uninterruptible focus-session blocker for ADHD/executive-dysfunction users
A website/app blocker that lets ADHD users commit to a focus session they cannot quit mid-way, for learning and work tasks.
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One Universal Core, then the exact file layout your platform expects — CLAUDE.md, .cursor/rules, a Lovable knowledge base, a Bolt prompt under its 400-word ceiling. Evidence travels with it.
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Supporting evidence4
Users explicitly want granular, time-based control over which sites/services they can access, not just a generic blocklist.
Demand for sessions that cannot be abandoned mid-way is named directly, suggesting willpower-proofing is the differentiator, not just blocking.
ADHD users describe wanting their environment to 'offload part of my brain', supporting a tool that removes choice rather than just tracks time.
Related struggle with task-starting (executive dysfunction) suggests adjacent feature demand (forced session start) beyond simple blocking.
Falsifying evidence4
Only 5 signals total, all from HN/PH within a two-month window; no revenue or payment evidence exists in this cluster despite the schema listing a revenue tier.
The two named products (mitmproxy, Tauri) are dev tools/frameworks, not competing focus apps, meaning the actual competitive landscape (Cold Turkey, Freedom, Opal, etc.) is entirely unverified by this evidence.
Website/app blocking with timed lockouts is a well-worn mechanic; free OS-level tools (screen time, hosts file edits) already do the core blocking job for free.
An uninterruptible session is a thin feature wrapper that any existing blocker (Freedom, Cold Turkey) could ship in a release, eroding differentiation quickly.
Most likely cause of death
The founder builds a blocker whose only real hook is 'you can't quit the session,' which existing focus-blocking apps can copy as a checkbox feature within a sprint, and without a distinct ADHD-specific workflow (forced task-start ritual, adaptive session design) the product commoditizes into a free hosts-file trick or gets absorbed by incumbents; defensibility would need to come from a genuinely different intervention model, not stricter enforcement of the same block-list idea.
Demand ladder
A complaint is not a customer. Weighted ×1 / ×3 / ×8 / ×15.
Counted from clustered complaint signals. No candidate-relative commercial check was applied, so no revenue is attributed to this idea.
Verified revenue: not established for this idea. No record ties a revenue figure to a product selling what this would sell.
Momentum
Is this problem getting louder or quieter?
Saturation
How many people are already on it. Most sites hide this.
Problem evidence
Who feels this, how often, and why what they use today does not fix it.
- Who feels it
- Self-identified ADHD / executive-dysfunction adults doing solo knowledge work or self-directed online learning, plus a smaller sub-group of parents restricting a child's study device. All signals are from people posting on Hacker News and Product Hunt about their own focus failures, not from managers or clinicians.
- How often
- Reported as a per-work-session problem — every attempt to start a study or work block. Frequency is inferred from the phrasing of the signals ('every time I try to learn something useful'), not measured; no signal in this block reports a duration or count.
- Why current fixes fail
- Two distinct failures show up. First, enforcement leaks: blockers are defeated by VPNs, uninstalling the app, or flipping a setting, and at least one person in this cluster reaches for mitmproxy-class tooling, meaning the user's own technical ability is the attack surface (S-4246, mitmproxy). Second, and more damaging to this idea: the blocker fires at the wrong moment. The signals about executive dysfunction say the failure point is the ten minutes before work starts — deciding what to do, opening the file, tolerating the first minute — not the moment a distracting tab is clicked (S-1935, S-4606). A stricter block does nothing for someone sitting in front of a locked-down, distraction-free screen who still cannot begin. Third-party free fixes (OS screen-time limits, hosts-file edits) already cover the mechanical blocking job at zero cost, so 'stricter' is not a purchase reason (X-346).
For people with executive dysfunction, the reported hard part is starting a task, not resisting a website once started — reminders and task lists already exist and do not solve it.
People do complain that app blockers are trivially bypassed via VPNs, uninstalls or settings changes, so enforcement leakage is a real felt failure.
Distraction during self-directed learning is described as an involuntary derail ('side quest') rather than a conscious choice, and users say they lack granular per-site/per-time control.
Seeing the full todo list is itself reported as cognitive overload for ADHD users, suggesting the intervention people value is scope-narrowing, not access-denial.
'Start a focus session you can't quit halfway through' is already a shipped product's marketing line in this cluster, i.e. the core hook of this idea is not an unmet gap but an existing launch pitch.
Adjacent launches attack the same pain with non-blocking mechanics — a physical desk timer cube and frictionless voice capture — indicating the market treats 'focus' as a crowded feature space with many competing intervention models.
No signal in this block shows anyone paying for a focus blocker, naming a price, or reporting revenue; the cluster's 'spend' and 'revenue' demand tiers are unsupported by any actual record here.
The core blocking mechanic is available free via OS screen-time controls and hosts-file edits, so willingness to pay must come from something other than blocking.
Who buys it
The person who feels the pain and the person who signs are rarely the same.
Who buys it is part of membershipThe buyer, the budget it comes out of, and what these people already pay for.Product concept and MVP
Two versions: the one you deliver by hand first, and the one you build.
Product concept and MVP is part of membershipThe concierge version, the buildable version, and the features deliberately left out.Competitors and alternatives
Including the free workaround people use today, which is usually the real competitor.
Competitors and alternatives is part of membershipDirect products, indirect ones, the workarounds, and where the gap actually is.Pricing model
modelledA proposal, not an observation. Benchmarks come from the data; the ladder is ours.
Pricing model is part of membershipA tier ladder with the reasoning behind each price point.Revenue scenarios
modelledArithmetic on the assumptions listed underneath. Change an assumption and the number changes.
Revenue scenarios is part of membershipBase, upside and aggressive cases with every input written out.Market size
modelledReachable customers, not a top-down industry figure.
Market size is part of membershipHow many buyers exist, what they spend, and how many you could realistically reach.Go to market
Named places, not channel categories. These signals came from somewhere.
Go to market is part of membershipWhere the first ten customers come from, then the first hundred.Roadmap
Each version ships something a user can use. No infrastructure-only phases.
Roadmap is part of membershipVersion by version, with what belongs in each.Pivot paths
Where this goes if the first version does not land — and the number that says it did not.
Pivot paths is part of membershipAdjacent directions, and the measurable trigger for taking one.Risks and kill criteria
The thresholds at which the honest move is to stop. Written before you are attached to it.
Risks and kill criteria is part of membershipRanked risks, and the numeric conditions under which to walk away.Validation plan
Seven days that cost nothing but time and can kill the idea before you build.
Validation plan is part of membershipA day-by-day plan and the interview questions that do not lead the witness.Sources and freshness
Every reference opens the original post. This is the part you should check first.
How sure are we, per claim
Where the data is thin, we say so instead of rounding up.
- demand
- Low
- payment
- No data
- market size
- Low
- competitor gap
- Low
13 references from 5 signals · evaluation written Sep 2, 2026.
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Eleven more sections behind this one
Who signs the cheque, what the space already charges, the seven-day validation plan, and the thresholds at which you should stop. Three ideas are open in full so you can judge the depth before paying.
19 people have looked at this · 0 turned it into a spec · 0 say they're building it