From AI-made lessons to proven mastery — in minutes, not weeks.

Generate lessons with the AI you already use. FelixDeck assigns them, grades them, shows you exactly which concepts each student is strong or weak in — and builds the next lesson to fix the gap.

Try it free — no waitlist See a sample mastery report

Works with ChatGPT, Claude, Gemini, Cursor · Private by design · Mobile-friendly

The FelixDeck Loop

Generate. Assign. Measure. Reinforce.

A closed system — not just another quiz generator. See gaps, then fix them.

Generate

Use ChatGPT, Claude, or Gemini with our skill — get an import-ready lesson + test.
Assign

Send a link. Students verify email in 30 seconds — no password, no form.
Measure

See concept-level mastery per student and per class: Needs Practice → Developing → Strong → Excellent.
Reinforce

One click: generate a targeted lesson/test for every “Needs Practice” concept.

How verification works

Confirm it’s them — then they start.

You send a personal assignment link. They tap This is me, enter a 6-digit email code, and begin in about 30 seconds. No password to invent or forget — and the attempt stays tied to the email you invited.

Personal invite — not a public open quiz URL
Short-lived email code, not a reusable password
Verified attempt records you can trust when you release results

How verification works Security & privacy →

FelixDeck confirm it's you screen for a geometry assignment with This is me button and masked learner email — Personal link → confirm email → start — click to enlarge

Results & Insights

Mastery, not just marks.

Every lesson and test breaks into concepts — Needs Practice, Developing, Strong, Excellent — so you see understanding, not just a percentage. Then At a glance turns the color grid into decisions: tap a band to filter who belongs there, multi-select to find Strong on every concept, and spot which idea landed best versus which still needs teaching.

Filter by concept × rating in one click — see the exact learners behind each color
At a glance stats: who is Strong across the board, who needs practice, and where the class peaked or stalled
Know what to reteach next — and who is ready for enrichment — before the next period
Ratings need real evidence (at least two scored questions per concept); missing work is not counted wrong

Concepts color legend and learner grid filtered to Reflection Strong, showing five matching students — Click a legend color — instantly see who is Strong (or Needs practice) on that concept

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Close the loop

Weak concepts become the next lesson.

Mastery without reinforcement is just a report. See Needs practice (and every other band) At a glance, check the gaps, then Create reinforcement lesson — an AI-ready prompt seeded with those concepts, not a blank chat.

Prompt seed includes concept titles and workspace identity when known
Suggests fresh questions — not a copy of missed items
Teacher review before anything is assigned

Try reinforcement after your first assignment For tutors →

Insights Concepts ratings for Reflection, Rotation, and Translation with Create reinforcement lesson button — From Needs practice to the next lesson — click to enlarge

Geometry diagrams

Geometry that looks like geometry.

Rotations, reflections, translations — rendered properly, not as ASCII art or broken LaTeX. AI generates the diagram spec; FelixDeck draws it into concept intros and questions.

More about diagrams →

Triangle reflected across the x-axis and y-axis on a coordinate grid — Reflect across both axes

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Teacher & tutor time

Manual grading, without the scavenger hunt.

Grade all pending pulls every essay and short answer that still needs you — across learners and questions — into one desk. Rubric, sample answer, and Save & next stay on screen so you clear a lesson or test backlog in a single pass.

Jump the queue by student and question from the side list
Score with the rubric, leave feedback, finalize — then move on
Built for tutors and teachers who cannot afford to open attempts one by one

Print a lesson or test — bring it to class.

Online when you can, paper when you need it. Generate a clean PDF of any lesson or test for the room — or print a named packet for every learner so teachers and parents stay organized without retyping rosters.

One question per page, ready for handwriting
Class set: learner name on every packet, QR per page
Generic shared copy when you do not need personalization
Built for teachers, parents, tutors, and in-person days

Sample student PDF cover with learner name, test instructions, time limit, and question count — Choose a generic copy or personalized learner packets. Select a page to enlarge it. Personalized examples use fictional names and QR codes marked DEMO.

Sample concept notes page with a worked example and common mistakes — Choose a generic copy or personalized learner packets. Select a page to enlarge it. Personalized examples use fictional names and QR codes marked DEMO.

ESOL & bilingual

Same course. Language of the home included.

Prompts, diagrams, answer keys, and printouts — English primary, secondary language inline. Chinese shown here; Spanish and others use the same fields. Toggle it when you generate a PDF.

True/false geometry question with English and Chinese text, diagram, and bilingual answer key — Question + answer key, side by side languages

Prepare PDF dialog with Include secondary language selected — Print: include secondary language

Concept introduction with diagram and English-Chinese common mistakes — Concept intro + “Watch out for”

ESOL & bilingual details For parents →

Who it’s for

Outcomes for the people who teach — and the homes that care.

Tutors

Assign, grade, and see concept gaps for every learner in one place. For tutors →
Parents

Know exactly what your child needs to practice — in your language. For parents →
Classroom teachers

Turn AI drafts into graded, concept-mapped assessments.
Homeschool families

Structured mastery tracking without building a curriculum from scratch.
Organizations & L&D

Import AI training, track completion, prove it was done.

Why FelixDeck

Built for the gap between a chat window and a full LMS.

	Generic AI quiz tools	Full LMS	FelixDeck
Bring your own AI	No	No	Yes
Concept-level mastery	No	Partial	Yes
Auto-reinforcement for weak concepts	No	No	Yes
Geometry diagrams that render	No	Varies	Yes
Fast essay / short-answer grading queue	No	Yes (heavy)	Yes (light)
Second-language lessons / tests	No	Rare	Yes
Student sign-up friction	Low	High	Lowest — email code, no password
Setup time	Minutes	Weeks	Minutes

Built with feedback

Shaped with tutors and parents before launch.

We are not inventing customer stories. FelixDeck is built with feedback from tutors and parents during beta — and we keep a real list of those conversations. When we publish named quotes, they will be from people who actually used the product.

Mastery and reinforcement designed around real grading pain
Email-code access for learners who should not manage passwords
Geometry and ESOL called out because practitioners asked for them

Pricing

Start free. Grow when your roster does.

Open now — no waitlist. Tiers below describe who each plan is for as we expand capacity.

For a parent testing one child

Free / Starter

Import AI lessons and tests, assign links, see concept ratings on released work.

Try it free

For a tutor with a small roster

Tutor

Grading queue, mastery reports, and reinforcement prompts for every learner who needs practice.

Start on free — upgrade later

For small teams

Team / Org

Completion records, verified attempts, and exportable reports for managers and L&D.

Create a workspace

Open now

Try it free — no waitlist.

Create a workspace, import an AI-made lesson or test, and see concept mastery with real learners.

Try it free Browse features

From AI-made lessons to proven mastery — in minutes, not weeks.

Generate. Assign. Measure. Reinforce.

Generate

Assign

Measure

Reinforce