A Practical Engine is the same technology behind Materia — pointed at a subject instead of a story. Commissioned, it becomes a patient, adaptive tutor built entirely around your curriculum: it teaches, it tests, it remembers exactly where you are, and it meets you there every time.
It doesn’t lecture and move on. It holds a real conversation, adapts to where you struggle, and never loses patience — a private teacher available any hour, for as long as it takes.
Every lesson is replayable. Every test evolves, so progress is earned rather than memorized. And nothing is ever lost — your levels, your milestones, and what you’ve mastered carry from one session to the next.
What It Is
A commissioned, AI-powered tutor built around your curriculum. It assesses where you are, teaches at your pace, drills you with tests that change every time, and tracks your progress across sessions. The same persistent-memory engine that runs a living world — applied to mastering a skill.
Who It’s For
Homeschoolers and tutors. Self-learners and the endlessly curious. Trainers building a team’s skills. Creators who want to teach their craft to an audience. Anyone who learns better one-on-one, at their own pace, with a teacher that never tires and never judges.
How It Teaches
A Tutor That Remembers You
Adaptive Tutoring
Meets you at your exact level, speeds up where you’re strong, slows down where you struggle — and never loses patience.
Remembers Your Progress
Your levels, milestones, and what you’ve mastered carry from one session to the next. Pick up exactly where you left off.
Ever-Evolving Tests
Every assessment changes, so you can’t game it by memorizing answers. Progress has to be earned for real.
Replayable Lessons
Run any lesson as many times as you need. Repetition without judgement, until it clicks.
Conversational Practice
Learn by doing — hold a conversation in a new language, rehearse a speech, talk through a proof. It responds in real time.
Built Around Your Curriculum
Bespoke to your syllabus, your standards, your goals. The lessons it teaches are the ones you define.
Progress Tracking
Clear levels, milestones, and mastery markers, so you always know how far you’ve come and what’s next.
Runs In-Browser
No installs. Runs on your own AI provider — your key, your rules, your data stays yours.
What Can Be Built
Point It at Anything
If it can be taught, it can be built into an engine. A few of the directions a Practical Engine can take:
Languages
Conversational practice, vocabulary, grammar, and gentle correction — at your pace, in real dialogue.
Mathematics
From arithmetic to calculus, worked at your level with a tutor that adapts to exactly where you get stuck.
Public Speaking
Rehearse, get feedback, and build confidence with a coach available any hour of the day.
Writing & The Craft
How scripts are really built, how songs are really written, how prose really works — the why behind the rules.
Music Theory
Theory, ear training, and composition, broken down and drilled until it’s second nature.
Test Prep
Targeted, ever-evolving practice for the exams that matter — never the same question twice.
Coding & Logic
Learn a language or a concept by building, with a patient pair-programmer that explains every step.
Homeschool Curriculum
A full, private teaching engine built around your family’s curriculum — one subject or many.
Professional Training
Onboard and upskill a team on your own material, with consistent, on-demand instruction.
…and whatever else you need taught. If you can define the curriculum, it can be built into an engine.
Available Practical Engines
Practical Engines built by F.C. Marrow, free to use with your own AI key. More are on the way.
Commission
Commission a Practical Engine
Bring your curriculum — a language, a subject, a craft, a whole syllabus — and MarrowMyth builds the engine around it: lessons, evolving tests, progress tracking, and a tutor that remembers every learner. Delivered ready to teach.