Turn labeled diagrams into
mask-and-reveal recall cards
Upload a labeled diagram — anatomy, a pathway, a chart — and ClassFactor creates image-occlusion cards that hide each label or region for you to recall. It is the fastest way to learn a diagram cold, and every card lands in your FSRS schedule.
- Automatic label detection on your diagrams
- One occlusion card per masked region
- Built for anatomy, histology, and pathways
- Scheduled with FSRS spaced repetition
Free to start · no credit card required
Label the structure
Tap a masked region to reveal the label
How it works
From a labeled diagram to recall cards in three steps
You bring the diagram. ClassFactor finds the labels, masks each region, and puts them on a schedule.
Upload a labeled diagram
Drop in an anatomy plate, a histology slide, a biochemistry pathway, or any chart with labels. ClassFactor reads the image and finds the labeled regions for you.
ClassFactor masks each region
Automatic label detection creates one image-occlusion card per masked region — hiding a single label while the rest of the diagram stays visible as context.
Recall, reveal, repeat
Study each card by naming the hidden structure, then tap to reveal. Every card is scheduled with FSRS spaced repetition so it comes back right before you would forget it.
What you get
Everything a diagram needs to become recall
Image occlusion in ClassFactor is built to make visual material as reviewable as any flashcard.
Automatic label detection
Point ClassFactor at a labeled diagram and it locates the labels automatically — no dragging boxes over the image by hand, one region at a time.
One card per masked region
Each label becomes its own image-occlusion card, so a single diagram turns into a full set of focused recall reps instead of one overwhelming picture.
Mask-and-reveal recall
Cards hide one region and keep the rest as context. You retrieve the answer from memory, then reveal it — the active recall that makes visual material stick.
Tap to reveal
Study is a single tap: name the masked structure, reveal the label, and grade yourself. It reads the same on a laptop or a phone screen.
Scheduled with FSRS
Occlusion cards are scheduled with FSRS spaced repetition exactly like every other card in ClassFactor, so your diagrams enter the same review queue as your decks.
Free to start
Image occlusion is included on the Free plan with a daily limit. Pro and Medical raise the limits when you are working through diagram-heavy courses.
Study one region at a time
Mask the label. Say it out loud. Reveal.
Each card hides a single region while the rest of the diagram stays on screen as context. You name the masked structure from memory, then tap to reveal and grade yourself — the active recall that turns a diagram you can recognize into one you can reproduce.
- Tap any masked region to reveal its label.
- Every label becomes its own card, so one plate drills every structure.
- FSRS brings each region back at the right time to stick.
Label the structure
Tap a masked region to reveal the label
What to occlude
Ideal for anything you need to know cold
If it has labels, it can become recall. These are where image occlusion earns its keep.
Anatomy
Mask every structure on a heart, a brachial plexus, or a cross-section and drill each one until you can name it cold — not just recognize it.
Histology
Turn a labeled slide into occlusion cards so you learn to identify tissues and cell types by sight, region by region.
Biochemistry pathways
Hide the enzymes, intermediates, and cofactors along a pathway and rebuild it from memory, one masked step at a time.
Any labeled visual
Flowcharts, physiology diagrams, and charts work the same way — anything you need to know cold becomes a set of recall cards.
Why it works
Because recognizing a diagram isn’t knowing it
Recognition is not recall
Staring at a labeled diagram feels productive, but on exam day the labels are gone. Occlusion forces you to produce the answer from memory — the retrieval that actually builds durable knowledge.
One structure at a time
Masking a single region while the rest stays visible keeps each rep focused and honest. You find out precisely which structures you know and which ones you are only guessing at.
It compounds with your decks
Because occlusion cards ride the same FSRS schedule as your flashcards, your visual and text-based studying reinforce each other inside one review queue instead of living in separate apps.
Works on web, iOS, and Android — your cards sync everywhere.
FAQ
Image occlusion, answered
Image-occlusion flashcards hide part of a labeled image — a single label or region — so you have to recall what it is before revealing the answer. You upload a labeled diagram and ClassFactor masks each region for you, turning one picture into a set of active-recall cards. It is one of the most effective ways to learn anatomy, histology, and any visual material you need to know cold.
Upload a labeled diagram — an anatomy plate, a histology slide, a biochemistry pathway, or a chart — and ClassFactor detects the labels automatically and creates one image-occlusion card per masked region. Each card hides a single label while the rest of the diagram stays visible as context, so you can study one structure at a time.
It is ideal for anatomy, histology, biochemistry pathways, and any visual you need to know cold. If your material has a labeled diagram — structures, enzymes, tissues, regions of a chart — you can turn it into occlusion cards and recall each part instead of just recognizing it.
Yes. Image-occlusion cards are scheduled with FSRS spaced repetition exactly like every other card in ClassFactor, so each masked region comes back at the right time to stick — and joins the same review queue as your regular flashcards.
Yes. Image occlusion is included on the Free plan with a daily limit. Pro and Medical raise the limits, which helps when you are working through diagram-heavy courses like anatomy or histology.
Yes — image occlusion works on web, iOS, and Android, and your cards sync across all three. You can upload a diagram on your laptop and drill the masked regions on your phone between classes.
Explore more
Works better with the rest of ClassFactor
Learn every diagram cold.
Turn your first labeled diagram into mask-and-reveal cards free — no credit card, ready in seconds.