Find a mistake. Build your own solution. Revise a step.
Audit. Articulate. Apply.
An iPhone math app for ages 6+. Planned launch: individual practice, from place value to introductory algebra.
01 / Audit · Question the reasoning
LogNormal shows a solution with a mistake. Your child edits a step; the software rebuilds the steps that depend on it.
A correct answer can hide faulty reasoning. Audit makes the steps part of the practice.
Definite Integrals · In development
The recording could not load. The still shows the native integral before repair.
02 / Articulate · Author the steps
Your child writes the steps; LogNormal checks the math.
One problem. Two accepted routes.
Available moves depend on the exercise. Mathematical rules check the work—not generative AI.
Binomial Squares · In development
Native demo · Scripted steps, live math checks.
Rounding · From the launch library
Correct the wrong rounding results. Leave the correct ones alone.
This completed set: 12 solved. None skipped. 26 cubes earned. Cubes are LogNormal’s reward currency.
Actual native test run · Reward amounts vary.
The learner’s view
Your child sees cubes earned and what to try next.
Cubes accumulate with the work. Mistakes and missed days don’t take them away.
The recording could not load. The still shows the native student dashboard with example cubes.
The parent’s view
See progress over time and the areas that need attention.
Talk with your child about what to try next.
3D pattern view · In development
Separate example data, not the rounding set above.
The recording could not load. The still shows the native parent overview with fictional example data.
03 / Apply · Put it to work
Solve a multiplication problem.
Correct answers bring the forest back.
Restore the Canopy · In development
03 / Apply · Put it to work
Place gates on the number line. Fire the beam.
Your positions determine whether it gets through.
Vector Rail · In development
And one more thing.
Use your phones to aim, fire and shield on TV. Correct rounding gives your partner more time.
Scan to pair. One phone hosts the match locally. No public lobby. No guest account required.
Play Together · In development
Native pairing screens
Apply / Phone Duel
Or compete phone to phone. One attacks. One defends. Rounding decisions change the shared match.
No TV needed. The match runs between nearby devices over an encrypted local connection.
Phone Duel · In development
Two native views of the same paired simulator match
App Store launch date to be confirmed
Planned first release: examine and build solutions across 25 core topics, from place value to introductory algebra.
LogNormal is not yet available for purchase.
Final price, local currency, availability, renewal terms, included features, and cancellation details will be shown in the App Store before purchase.
Advanced exercises, Play Together, and the 3D parent view are in development.
The working launch plan spans whole-number sense, arithmetic, estimation, equal groups, fractions, rational numbers, equations, inequalities, and bounds. The App Store listing will confirm the final launch library.
Built for ages 6+, with a curriculum intended to grow through university mathematics. LogNormal complements parents, teachers, and tutors; it does not claim to replace them or a complete curriculum. Advanced demonstrations on this page are in development.
A few good questions
The ten essentials.
More, if you’re curious.
All 20 questions
Mathematics software for iPhone. Learners question the reasoning in front of them, construct mathematics of their own, and put it to work in interactive situations. Correct answers matter. So does the thinking that gets you there.
Built for learners ages 6 and up. The planned first release runs from place value to introductory algebra, with the curriculum intended to grow through university mathematics.
Because spotting a mistake, building a solution, and using an idea are different abilities. Audit asks you to inspect and repair reasoning. Articulate asks you to author the mathematics. Apply makes your mathematical decision change what happens. Together, they reveal understanding that a correct final answer alone can miss.
Yes. In exercises with path-aware reasoning, LogNormal checks the mathematical transformation rather than demanding one prescribed sequence. A two-step equation can begin with division or subtraction when either is valid. The accepted transformations depend on the exercise; this is not an unrestricted computer algebra system.
No. Student work and mathematical judgments are handled by deterministic mathematical rules, not generative AI. The app checks against the rules and supported transformations of the exercise—not a language model’s opinion.
The working launch plan spans whole-number sense, arithmetic, estimation, equal groups, fractions, rational numbers, equations, inequalities, and bounds. The App Store listing will confirm the final launch library.
Explore the curriculumNo. The site also shows where LogNormal is going. Advanced exercises, Play Together, and the parent views are labeled as development work. The App Store listing will be the source of truth for included topics, learner and family features, language availability, device support, price, and purchase terms.
The App Store launch date is not yet confirmed. LogNormal is not available for purchase yet. Launch updates and the eventual App Store link live on the Founding Families page.
Launch and Founding FamiliesThe launch price is $10 USD per month per learner. The App Store subscription is being prepared; no subscription is available for purchase yet. Final price, local currency, availability, renewal terms, included features, and cancellation details will be shown in the App Store before purchase.
Launch and Founding FamiliesThe Privacy Policy separates what the website handles from app accounts, device data, and learning records. The Children & Families notice explains the planned guardian protections and remaining release requirements. Those notices—not a blanket claim that everything stays on-device—are the place to check the details.
Privacy Policy · Children & FamiliesLogNormal is being built for iPhone. The App Store listing will confirm supported devices and iOS versions for the release you can download.
Inspect someone else’s mathematical reasoning, identify what is wrong, and repair it. In the advanced demonstrations, an upstream repair can rebuild the steps that depend on it. That is criticism of the mathematics, not simply picking a different final answer.
The learner builds the mathematical work itself: a grouping, a calculation, or a sequence of transformations. The construction is part of the evidence, instead of disappearing behind a single answer box.
The mathematical decision changes the represented situation. A position on a number line aims a laser; an arithmetic decision can restore part of a canopy. The mathematics does a job in the world, rather than unlocking an unrelated reward after a question.
It gives mathematics a shared consequence. In the rounding duel, each person’s decision changes the same match, making the reasoning something you can talk about and respond to together. Play Together is in development and is not part of the planned first public release.
The developing parent views explore patterns across practice areas and over time, including where attention may be useful. The recordings use example data. The final family features will be identified before purchase; a visualization is not a diagnosis.
No. LogNormal is a focused mathematics product that can sit alongside parents, teachers, and tutors. It does not claim to replace their judgment or an entire curriculum.
Future pricing has not been decided. The App Store purchase screen will show the price, renewal and cancellation terms before purchase.
No. It is a request for launch email, not a purchase, an invitation application, or a reservation of access or price. The App Store offer and terms at purchase determine the subscription.
Launch and Founding FamiliesYes. The question form and launch signup are separate. Sending a question does not subscribe you to launch or marketing emails. Please use adult contact information and leave out passwords and unnecessary details about a child.
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Email Matthew about what your family needs from math software.