ThetaWave vs Lilys AI

Stop at the summary?
Don't. Master it.

Lilys AI is great at giving you the gist of a long YouTube video or PDF. ThetaWave is built for the next step — preparing for the exam — with flashcards, quizzes and mind maps grounded in your real sources.

Free plan · No credit card

Proven performance

Summary → Exam kit

From summary to study system

Summaries are the start. Study kits, retrieval and active recall are what move grades.

ThetaWave · exam kit

Lilys · summary

Loved by exam-week students

Choose your study partner

Same lecture. Same exam. Very different output.

ThetaWave

Source-grounded

Zero hallucination — every note links to a real PDF page, slide or transcript timestamp.
One-click flashcards, mind maps and practice quizzes from the same upload.
Native inputs: live lectures, audio, YouTube, PDF and slides.

Free plan · Pro from $0.33/day (annual)

Lilys AI

Content summarizer

—Optimized for distilling a single long video, podcast or PDF — not a full course.
—Summaries and key-points, but no native flashcards, quizzes or mind maps for active recall.
—No real-time lecture capture flow — designed for content you've already found.

Free + paid tiers

Where Lilys ends

3 things Lilys wasn't built for

Lilys is excellent at the read-once moment. Here's what's still missing for exam week.

Gap 01

No active-recall study kit

““Make me 50 flashcards from this 3-hour lecture summary.” — not the native action.”

Truth: Summarizing is passive; flashcards and quizzes are what move grades.

ThetaWave turns any source into flashcards and quizzes for real active recall.

Gap 02

One source at a time

“You summarize today's lecture, but yesterday's PDF and last week's slides don't connect.”

Truth: A real exam covers a whole course, not a single video.

ThetaWave indexes every lecture, slide and reading together and answers questions grounded across them.

Gap 03

No live lecture capture

“Class is happening now — you still need a separate recorder.”

Truth: Lilys works on content that already exists, not class in progress.

ThetaWave records and transcribes the lecture live, then structures it into study material on the spot.

Migration

From summary to study kit in 60 seconds

Keep using Lilys to triage long content. Bring it into ThetaWave when it's time to revise.

1~10s

Take your Lilys summary

Copy the YouTube link, PDF or podcast you've been summarizing.

2~30s

Pair it with the course

Drop in the related lecture, slides or PDFs so everything stays grounded in your real syllabus.

3~20s

Generate the exam kit

One click → notes + flashcards + practice quiz.

Want the exam kit? Start your free trial

FAQ

Questions, answered

For exam prep — yes. Lilys is excellent at giving you the gist of a single long video or PDF. ThetaWave takes that material and builds the actual study kit on top: structured notes, flashcards, practice quizzes and mind maps, all grounded in your real lectures and readings.

Yes. Paste any YouTube link into ThetaWave and you'll get a structured summary, plus the same content turned into flashcards, a quiz, a mind map or an audio podcast — without re-prompting.

Yes — audio is a native input. Upload an MP3, record live, or paste a YouTube link, and ThetaWave transcribes, summarizes and generates the study kit from the same source.

Yes. Many students use Lilys to triage long YouTube content quickly, then bring the same source into ThetaWave once it's time to actually study from it.

Lilys uses a free tier with paid plans for heavier summarization. ThetaWave has a free plan; Pro starts at about $0.33/day on the annual plan ($118.80/year), with weekly and quarterly options. Verified students get 30% off the first billing cycle.

Beyond the summary

Turn your sources into exam-ready study kits.

Notes, flashcards and quizzes — grounded in your real lectures and readings.

Free to start No credit card Results in 2 minutes

Stop at the summary?Don't. Master it.