Revula
Record, drop in a video or PDF, and Revula synthesizes it into one grounded note — then keeps it from slipping before your exam.
One number tells you when you’re ready.
Erulia scores how you’d actually perform if the exam were tomorrow — not how many pages you read, cards you flipped, or hours you logged.
Get Erulia See how the score works
Free to install. $14/mo for both, or use the free tiers.
Sample Revula dashboard: Physics PHY-204 Readiness Score 67 out of 100, up 4 this week from 63, midterm in 3 days on Friday 29 May, with three concept scores — Thermodynamics 88 strong, Entropy and the Second Law 52 decaying, Statistical Mechanics 34 weak.
Capture. Measure. Rehearse.
Three stages, one subject, one number at the end.
Lurest · the way in
Lurest catches it while it’s still in the air.
Record the lecture, drop the chapter, paste the video. Everything comes back as text you can point at — a claim at 04:12 of Tuesday’s lecture, a definition on page 198 of Atkins. Nothing is retyped, and nothing is summarised into something you can no longer check.
How capture works- Entropy & the Second Law 04:12 Captured
- Carnot Cycles — Explained 08:45 Captured
- Atkins — Physical Chemistry, Ch. 14 p. 198 Captured
- Atkins Ch. 16 — Statistical Thermo Processing
Erulia · the measurement
Then one number, honestly earned.
The score is a live estimate of how you’d perform if the exam were tomorrow. It rises when your understanding does, and it falls when a concept starts to fade — four times in the fortnight below. That is not a bug in the chart. It is the only reason a rise means anything.
What moves the score
67of 100
+4 this week
Revula · the destination
Revula aims practice at what’s fragile.
Not the whole syllabus. The one concept holding the number down — asked in a form you can’t bluff. You commit an answer before you’re allowed to see the right one, so the score reflects what you could actually produce under pressure rather than what looked familiar on the page.
Inside RevulaQuestion 2 of 6 · from your lecture at 04:12
Entropy is a state function measuring what, exactly — and why does that let you integrate along any convenient path?
How energy is spread across the microstates the system can reach. Because it’s a state function the change only depends on the endpoints, so
Commit
The mechanism
A score that doesn’t flatter you.
Four things decide the number. None of them is how long you sat with the book open.
Concept graph
Material is decomposed into prerequisite concepts. A weak link that blocks a chain of dependent ideas carries more weight than one that doesn’t.
Adversarial probing
Short questions generated at the edge of what you know, not the middle. Getting them wrong is the measurement working, not a grade.
Decay model
Knowledge fades on a schedule — a straight line down until the floor, then held. The score reflects what you’d still have under pressure, not what you saw yesterday and haven’t touched since.
Calibrated to reality
Weighted against your course’s past exam distributions where they exist — so a 67 is meant to predict a 67, not to feel like one.
What goes in:
Lecture
Video
PDF
Slides
Article
Note
The ecosystem
Two apps. One number between them.
Lurest is where thinking gets caught. Revula is where it gets rehearsed until it holds up. Erulia is the honest measurement in between — and the reason the other two are worth using together.
Free · the way in
Lurest
Capture without breaking flow. Lectures, PDFs, slides, videos, articles and your own notes — all of it citeable afterwards.
- Six source kinds
- Every claim keeps its anchor
- Works on its own
The destination
Revula
Rehearse what’s fragile, in exam shape. Practice commits before it reveals, and every question traces back to the source it came from.
- One note per topic
- Four practice modes
- Every citation resolves
Sample score. Erulia is the layer between the two apps, not a third app to open.
What we don’t do
Three things this product will never have.
No fake
reviews.
No invented testimonials, no stock-photo students, no press quotes we didn’t get. When there are real ones, they’ll have names attached.
No
streaks.
Nothing here rewards showing up. A day you didn’t study is a day you didn’t study, and the number already knows.
No score that
only goes up.
It falls when a concept fades, and it can fall on a day you worked hard. A number that only rises is a progress bar wearing a lab coat.
Questions
The six questions people actually ask.
A live estimate, from 0 to 100, of how you’d perform on this subject’s next assessment if it were tomorrow. It’s built from concept-level evidence — what you produced under questioning, weighted by how much each concept matters and how long ago you last proved it — not from time logged or material covered.
No. Lurest is useful on its own as a capture tool, and Revula works with whatever material you put in it. You get a Readiness Score once there’s enough evidence to earn one — the two apps together just get you there faster, because captured sources arrive already citeable.
Free is a real tier, not a trailer. Lurest captures three hours a month on it; Revula runs one subject — with the whole mechanism intact: every practice mode, the real score, the full history. Paid is $14 a month for both apps, or $89 a year, after a fourteen-day trial. The full table is on pricing.
Six kinds: a recorded lecture, a video, a PDF, a slide deck, a web article, and notes you write yourself. Each one comes back with anchors — a timestamp, a page, a slide, a paragraph — so anything built on top of it can point at where it came from and you can go and check.
Yes, and it’s supposed to. Concepts decay if you don’t revisit them, and a probe you fail moves the number down the same way one you pass moves it up. A score that only rises tells you nothing on the morning of the exam.
A lot of it, and we write down which parts. Transcription, concept extraction and question generation are model work; the product decisions, the copy on this page and the scoring rules are not. We keep a page listing what’s AI-made and what isn’t — how we build.
Get Erulia
Two installs. No app store, no installer, no card.
Each app installs from the web, straight onto your home screen or your dock. Pick the one that sounds like your problem — or take both for one price.
Lurest
Record the lecture, drop the chapter or paste the video — whatever goes in comes back as text you can point at, with an anchor on every line.
The install gesture differs by browser — the exact one for your device is on /download. No card is needed to install.
Erulia
Stop guessing whether you’re ready.
Install whichever one sounds like your problem. The number appears when there’s enough evidence to earn it — and it tells the truth on the way down too.
$14 a month for both apps, or $89 a year, after a fourteen-day trial. Each app also has a free tier that does not expire.