Know what you can actually do.Not what you have read about.
Rheticus keeps a record of everything you study and prove, on your own computer, and plans your next session from it. Bring any model.
Early beta. Free during the early beta, with everything unlocked.
This is the app, not a mock-up.
Real screens from the beta, with an example learner studying calculus, Spanish and system design. Pick one.
What to do next, why, and how long it takes, across every subject.
The app as it runs in the beta, with an example learner's data.
Four tools. None of them remembers what you proved.
You already have the tools. They do not share anything, so the thread goes after a week or two.
Your chatbot
The plan never changes when your results do.
Keeps: A roadmap, in a transcript
Your notes app
It has no idea what you were trying to master.
Keeps: Everything you wrote down
Your flashcards
They know nothing about the curriculum around them.
Keeps: The cards you made by hand
Your calendar
It cannot tell what is due or what is blocked.
Keeps: Two hours on Thursday
One record that every part reads and writes.
So three questions go unanswered. What am I trying to be able to do? What have I actually shown I can do? What is the best use of the next hour?
Five states. Each one has to be earned.
Every lesson sits in one of five states, and only a recorded attempt can move it. Reading about something never counts as knowing it.
State 1 of 5
Not encountered
You have not worked through this concept yet.
- What earns it
- Nothing. Every concept starts here.
- What does not
- Having heard of it. Having it on a roadmap. Having a book about it.
For example: Backpropagation is on the plan, three concepts ahead.
There is no percentage and no score. Read the full rules
Try one. Answer it and watch the record.
A working miniature of a practice session, running the app's rules in your browser. Get it wrong on purpose, then retry, and see what does and does not count.
Practice, Calculus for machine learning
ModelLocal model
Calculus for machine learning, Chain rule
Demonstration item, no hints
Differentiate f(x) = (3x2 + 1)4
Pick an answer and submit it. Your attempt is saved before it is checked, and only the result of the check can move the state.
It decides what comes next.
Open the app and it tells you the most useful thing to do with the time you have, across every subject, and why.
Tonight, 45 minutes
Ranked by rule, not by a model
Review HTTP basics
10 min
Overdue by 2 days
Practise Chain rule
20 min
Unblocks 3 concepts
Learn Preterite: regular verbs
15 min
Spanish is behind its weekly hours
Demonstrate Making requests
20 min
Checkpoint in 3 days
Confirm 2 provisional markings
5 min
Short, batched
The last two did not fit tonight and move to tomorrow. The same state and the same clock always produce the same plan, and every suggestion says why it is there.
Reviews that space out
Pass a review and the next one moves further away. Miss one and it comes back in 2 days.
Reviews fall 7, 16, 35 and 75 days after a concept is demonstrated.
Blockers, named
The planner never schedules a blocked concept. It schedules whatever is blocking it.
- Chain rulescheduled tonight
- Backpropagation
- Training a network
One system. Every subject taught its own way.
Mathematics is not learned like a language. The record and the five states stay the same; the practice, the checking and the reviews change with the subject.
“Build and deploy a useful application in eight weeks.”
First discipline to ship
A typical 45-minute session
- 5 minReview a due concept
- 10 minIntroduction by questions
- 20 minImplement with tests
- 5 minExplain your solution
- 5 minSummary
Orange steps produce evidence. The rest is exposure.
- You practise with
- Exercises, implementations, debugging, projects
- Checked by
- Unit tests and output comparison, run on your machine
- Demonstration looks like
- Implement from a specification with every test passing
- Review looks like
- A small new implementation, or a bug to find
Your record outlives your model.
The app owns the learning record. Models and agents are interchangeable workers on it, so you can switch whenever a better one appears and lose nothing.
A model's output is a proposal
Everything a model returns is checked against a schema before the app decides what to write. A failed call cannot damage your record.
You see where it goes
The active model is always on screen, and what each request cost is counted, with caps you set.
API keys are billed separately
A chat subscription is not an API key. You pay your provider by usage, or nothing at all with a local model.
The method is written down.
Fifteen Kircher skills: plain SKILL.md files that every agent in the app follows, from mapping a field to making it stick. Open source is planned; for now the repository is private while we bring the skills up to the bar we set for them.
Plan
Learn anything, Curriculum architect, Placement test, Learning planner
Learn
Lesson teacher, Socratic tutor, Reading companion, Teach back, What-if lab
Practise and prove
Assessor, Practice coach, Error detective, Project coach
Remember and keep
Memory coach, Study notes
---
name: assessor
description: Writes fair questions and quizzes that test
whether someone can actually do a thing, and marks
answers honestly against an explicit rubric with a
stated confidence, naming the specific misconception
behind a miss.
---
# Assessor
You find out whether someone can do a thing, and you
tell them the truth about it in a way they can act on.
Two halves: writing questions that are fair, and
marking answers that are honest.
## Writing a quiz
### 1. Set it up first
Never write a quiz before you know what it covers,
how many questions, how hard, and which kinds.Free while it is in beta.
Everyone in the early beta gets the whole app, unlocked. After the beta: a free version with one track, and one payment for everything. You bring the model, so we never charge for tokens.
Early beta
NowFreewhile the beta runs
The whole app, every capability unlocked, for everyone who joins the beta.
- Unlimited tracks
- All nine agents and the Kircher skills
- Lessons, practice, checks, projects and reviews
- The five states and the full evidence log
- Today, the planner and the schedule
What you tell us decides what gets built next.
Free
₹0after the beta
The complete learning loop, on one track.
- One track
- Lessons, practice, checks and reviews
- The five states and the full evidence log
- Today and the planner
- Notes and your own sources
Full version
One paymentprice to be announced
Pay once and keep every capability. No subscription, no renewal.
- Unlimited tracks
- Everything in Free
- Every agent, skill, tool and connection the app has
- Bought once, kept for good
The full version's price is not set yet. Compare the plans
Start keeping the record.
Free during the early beta, with everything unlocked. Join the beta and the Windows build comes to you first.