1 / 4 · bullets
Concept: expected value
- Expected value weighs each outcome by its probability
- EV = sum of (probability × payoff)
- Choose the action with the highest EV when you're risk-neutral
Lecture recording to slides you will actually study from.
A study guide deck from a lecture or training recording.
Drop a recording2 / 4 · table
Payoff table
| Action | High demand (p = 0.6) | Low demand (p = 0.4) | Expected value |
|---|---|---|---|
| Build large | 200 | -50 | 100 |
| Build small | 100 | 20 | 68 |
3 / 4 · hero_stat
Key result
EV = 100
Build large has the higher expected value
0.6 × 200 + 0.4 × (-50) = 100
4 / 4 · bullets
Check yourself
- What does expected value ignore about risk?
- Recompute the table if high demand drops to p = 0.4
- When would a risk-averse student pick Build small?
Example output: a study guide deck
Illustrative example of the layouts a Study guide deck uses, here for a decision-theory lecture. Your slides come from what your lecturer said.
For students and trainers · Try 2 decks free
Turn a lecture recording to slides in one pass: drop the lecture or training recording and get a study guide deck that walks through each concept in order, with definitions, worked examples, tables that stay tables, and self-test questions at the end. If you came looking for lecture to notes AI, this is that, with the notes laid out as slides you can edit.
- No card required
- Editable PowerPoint
- Files auto-delete
What you get from one lecture
Concepts in order
One concept per slide, with a one-line definition and the key rule or formula.
Worked examples
The examples from the lecture, kept with the concept they explain.
Tables stay tables
Data becomes tables, and comparisons become columns, instead of a list of bullets.
Takeaways and self-test
A summary of what matters and 3 to 5 questions to check yourself.
How it works
1
Drop the recording
Upload the lecture audio or video, or a direct link to the file.
2
Skip the tangents
Uncheck announcements and off-topic sections.
3
Pick “Study guide”
Get the deck, edit anything, and download PowerPoint.
How a lecture recording to slides workflow saves study time
Rewatching a 90-minute lecture to find one definition is slow. A study guide deck puts each concept on its own slide, in the order it was taught, with the example that explained it.
Tables matter most. A decision-theory lecture had a payoff table at its core, and our first version flattened it into four bullet points. A reviewer said the table, rendered as an actual table, was the single slide that would sell the product. Now tables stay tables.
For a course that runs over several sessions, Pro can combine 2 to 10 lecture recordings into one deck that shows the patterns across them and how often each came up. Pick a slide count of Auto, 5, 10 or 15.
Before you download, preview every slide: click any text to edit it, reorder or delete slides, or ask Claude to refine a single slide. You get an editable PowerPoint with no watermark.
Uploaded recordings are automatically deleted about 24 hours after upload, and generated files after 30 days. We don't train on your files.
- One concept per slide, with a definition and the key rule or formula.
- Worked examples kept next to the concept they explain.
- Comparisons as columns and data as tables.
- 3 to 5 self-test questions at the end.
When unfill.io isn't the right tool
It works from a recording you already have, so it won't record a lecture live or join an online class. Check your course's rules on recording before you record anything.
It builds study slides from what was said, not from the textbook. If a topic wasn't covered in the lecture, it won't appear in the deck. And if the lecture slides already cover everything, you may not need a deck at all; this is for what was only said out loud.
Questions
Can I turn a lecture into notes instead of slides?
The notes come as a deck. Upload the recording and pick Study guide: the lecture is split into timestamped topics, you uncheck the tangents, and the deck walks through each concept with definitions, worked examples, common mistakes, key takeaways, and self-test questions. Edit any slide, then download an editable PowerPoint.
What files work?
MP3, MP4, MOV, WAV, M4A, WebM, AAC, and OGG, up to 500MB. You can also paste a direct link to a file, including Loom download links. YouTube, Zoom, and Meet share links are web pages, so download the recording and drop it instead.
Can I edit the deck?
Yes. Edit any slide in the browser, ask Claude to rewrite it, then download a normal PowerPoint file you can change however you like.
What happens to my recording?
It is used only to build your deck and is automatically deleted about 24 hours after upload. We do not train AI models on your files.
How much does it cost?
Try 2 decks free, no card required. Pro is $19/month or $180/year for 30 decks a month, combining up to 10 recordings into one deck, and share links.
Dad joke break
What's a study guide's favorite snack?
Less cramming. More knowing.
Try 2 decks free, no card required. Editable PowerPoint. No watermark.
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