Wrong on purpose. Right by design.
Critical-thinking app · Ages 10–14
Wrong on purpose. Right by design.
Your kid stops taking answers on trust. Errol is the math companion who's always wrong: find his bad step, explain why it breaks, earn detective rank. It's the one skill AI can't hand them.
Catch Errol's mistake↓→
How a case works ↓·For parents →
Today's caseObvious · Arithmetic
A movie starts at 3:45 and lasts 90 minutes. When does it end?
1. 1Errol: “Start time plus running time. Easy.”end = 3:45 + 90 min 2. 2Errol: “90 minutes is 0.90 of an hour, so…”\= 3.45 + 0.90 = 4.35 3. 3Errol: “So the movie ends at 4:35. Done!”end = 4:35
Errol's confidence
88%
↑ one step is wrong. Tap it.
Five steps. One detective. One sneaky robot.
Every challenge follows the same beat. Errol works the problem out loud, your kid watches for slip-ups, then breaks down what went wrong in their own words.
01
Errol solves it
Step-by-step working, but one step is sneakily wrong.
02
Kid scans
Reads each step like a case file. No timer. No pressure.
03
Tap the slip
Highlight the bad step. Confidence drops on Errol's face.
04
Write the why
Explain what Errol got confused about, in their own words.
05
The reveal
Errol reacts. Real solution shown side by side. Rank up.
In a world flooded with AI, the rare skill is knowing when it's lying.
Most learning apps reward the right answer. We reward the right question. Because your kid will hear a hundred plausible answers a day, from chatbots, classmates, and confident strangers. Spotting the broken one is the superpower.
- 1 Calibrated wrongness Errors come in three tiers (Obvious, Sneaky, Expert) matched to age and skill. The sneakier the catch, the bigger the rank-up.
- 2 Always show the work Every solution Errol attempts is shown step-by-step. Kids learn pattern-matching for bad reasoning, not just bad answers.
- 3 Explain in their own words Submitting the catch isn't enough. Kids type a short explanation: the act that builds real understanding.
- 4 No grades. No leaderboard unless you switch it on. Just rank. Rookie → Inspector → Detective → Sherlock. Earned by catches, not speed.
- 1 kid profile
- Obvious tier only
- 3 cases / day
- ·Not included: No replay
- ·Not included: No parent dashboard Get started
- 1 kid profile
- All three difficulty tiers
- Unlimited cases
- Replay past catches
- ·Not included: No parent insights Choose Learner
- Everything in Learner
- Parent dashboard
- Weekly progress digest
- Misconception flags Choose Parent
- Everything in Parent
- Up to 4 kid profiles
- Siblings' progress side by side
- Per-child progress tracking
Made for the homework table. Not the algorithm.
One Errol. Many moods.
Errol's confidence drops in real time. When your kid catches him, his face crumples. When they miss, he beams. Emotion is the hook.
The case file system
Every solve becomes evidence. Past catches are replayable, annotatable, and shareable: proof your kid is building a real skill.
No ads. No data harvesting.
We don't sell to your kid. We don't profile your kid. One subscription, no dark patterns, COPPA-respecting from day one.
Free for three cases a day. Honest from there.
Three cases a day, free. New accounts get the Parent plan free for 7 days, no card needed. Cancel anytime.
Founding 50
Save 50% the first year: only 50 founding family spots
Half price on yearly for the first 50 families. Lock it in before the seats are gone.
MonthlyYearlySave 20%
Free
Try Errol with one kid.
$0/ forever
Learner
For one kid who's hooked.
$66.99/year
Most popular
Parent
One kid + you in the loop.
$95.99/year
Family
Up to 4 kids, one dashboard.
$143.99/year
Free plan forever · 7 days of Parent free, no card · Cancel anytime·Every problem is verified before your kid sees it How that works →
Schools: flat-rate licensing for classrooms of 10+. Contact us →
Things parents actually ask.
Everything parents want to know before getting started.
What age is Lathoa for?+
Built for kids 10–14. The case difficulty adapts: younger kids get one-step number checks, older kids get multi-step word problems where Errol's mistake is buried three lines down. It works equally well at the homework table or on a tablet in the back seat.
How is this different from a tutor or Khan Academy?+
Tutors and Khan teach kids to get the right answer. Lathoa teaches kids to spot a wrong one: the skill they'll need every time they ask an AI for help. They're complementary, not competing.
Is this safe for my kid? What about AI safety?+
Errol is powered by AI, but every problem goes through a separate verification step before your kid sees it. If the AI tries to claim 2+2=5, verification catches it; if Errol's 'wrong answer' isn't actually wrong, we discard it and try again. So you get the variety of generated content with the safety of verified math. There's no open-ended chat. Kids interact with structured cases; they don't talk to a model.
What subjects are covered?+
Math today: arithmetic, fractions, ratios, pre-algebra, early geometry, all aligned to Common Core 4–8. Reading comprehension and basic logic are next on the roadmap, with science to follow.
Can I cancel anytime?+
Yes. Cancel anytime from the billing portal, no phone call or email gauntlet. The 7-day trial every new account gets needs no card, so there is nothing to cancel when it ends. Monthly plans cancel at the end of the cycle and you keep access until then.
Does my kid need their own device?+
No. Lathoa runs in any browser, on iOS, and on Android. The Family plan supports up to 4 profiles on one account, so siblings can share an iPad and the app remembers who's who from a 4-digit PIN.
Want to go deeper?
Practical articles for parents on raising kids who think critically about AI: error-detection learning, AI literacy, and the daily habits that build sharper minds.
Every kid can think critically
In a world full of AI-generated answers, the most important skill is knowing when the AI is wrong. Start building that skill today.