What's new

When you ask why, say you're bored, or ask when you'll ever use this, that question is the turn and the lesson's own question waits. Gilbert now isolates a single arithmetic slip, contrasts a wrong idea with one you already have, re-labels the same problem in your world, and refuses to hand over answers by naming your own test.

• "4 plus 3 is 8" gets "Check your math. What's four plus three?" and nothing else.
• A wrong idea gets a two-column contrast with a case you can already do, then one question.
• "When will I use this?" keeps the same numbers and renames the terms with what you're into.
• "Just give me the answer" gets a no that names your test, then a picture instead of a rule.
• A right answer gets three words and a harder case, not a recap.

Gilbert opens with your name and the test you told him about, then a plan card with a skill bar for every concept in the unit. The bars come from your mastery record, never from the model. Your own words now appear on the board in your ink.

• Onboarding asks what you're into outside school and what you're studying for.
• Mention a test mid-session and it becomes the priority next time.
• The starter card opens on the skill that needs the most work, not the last one touched.

Fourteen scripted student behaviours, each tied to a learning-science finding, scored by an independent judge on a three-criterion rubric. Gilbert and Aristotle were run on the same rubric. The paper and every result file are in the repo.

Four enrichment lessons: the imaginary unit, complex arithmetic and conjugates, complex roots and the discriminant, and synthetic division. Each has retrieval checkpoints, a misconception for Gilbert to hook, and a figure or step solver.

Ask to see a = 1 next to a = 3 next to a = −1 and Gilbert plots every case on one set of axes with a legend, then asks what differs. Colours are fixed per series and checked for colour-vision deficiency.

Case illustrations and course cards are painted in the watercolour style and cached, with a faster picture model behind them so a new scene appears in about two seconds.

If the board fails, Gilbert tells you why in plain words and you can report it without describing anything. Retry only appears when a retry can work.

A profile picker for households, invites, and a guardian dashboard. Parents switch into a child's view without a second login. The login wall now sends you back to the exact page you were on.

Every course purchase produces an itemized invoice a family can submit to an education savings account or 529 plan. Prices are stated in USD, and the credit is granted once payment clears.

A state-by-state guide to education savings accounts and how Units fits each program, starting with Arizona.

The composer sits on the keyboard instead of under it, the layout follows the real iOS keyboard, ordering and split handles are touch-sized, and installed home-screen versions keep their art fresh.

A live camera and a multi-photo composer on phones; on a laptop, a code to shoot the page with your phone. Gilbert responds to the step you tried.

Fish Audio is the default voice engine wherever a Gilbert voice exists, and voice now works on iOS.

Matching tasks on the board turn each pair green or red when you check, the same way lessons do.

A single right answer is not the end of a sitting. Gilbert keeps teaching until the lesson's objectives are shown, and you can see him thinking while he works out the next move.

Last sitting's notes and concepts become "Our last session" plus "Today's focus", in full sentences, spoken before the first question.

Talking while the mic is on, pressing the mic, or starting to type stops Gilbert mid-sentence. Reopening a session replays its last turn from the start.

The spoken line is the teacher's sentence and the written line is its shorthand. Symbols are read as words, tables are never read as pipes, and Gilbert reacts to your words instead of reporting them back.

The first turn on a concept hooks the common wrong belief with a prediction you commit to before anything is explained. Wrong predictions get defended, then resolved by name.

Pyramids, flows, cycles, Venn diagrams and trees are inked stroke by stroke. Reveal tables ink with the pen, comparisons become tables, and quotes get a hand-ruled margin.

A bookmark on each turn saves it to a Notes page; widgets save as plain markdown.

A speed control from 0.75x to 1.5x next to mute, and Gilbert can be thrown, bounces off the walls, and springs home.

The lesson whiteboard and math canvas switch colour scheme with the app.

Complete a value table or place points on a plane right on the board, with a reset for any graph.

A sketch surface built on Excalidraw for working things out by hand, alongside a composer that takes photos and pasted images.