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SynthIt vs NotebookLM

SynthIt vs Google's NotebookLM compared on price, source limits, and what happens after the summary. See how a study-focused workspace stacks up against a research notebook.

SynthItNotebookLM
Paid plan$19/mo (one Pro plan)Bundled into Google AI plans — Plus ~$5/mo, Pro ~$20/mo, Ultra $100+/mo
Free plan5 items, no cardGenerous — up to 100 notebooks, 50 sources each
Flashcards, quizzes, spaced repetitionBuilt in, from any sourceNot offered — no study or review mode
Source typesPDF, Office files, EPUB, images, web pages, YouTube, audio, videoDocs, PDFs, web pages, YouTube, audio, slides
CitationsEvery claim, flashcard, and quiz question cited to the sourceInline citations in chat answers

NotebookLM figures are from third-party pricing coverage as of September 2026 and change often — check Google's own NotebookLM/Gemini plans before you buy.

Why people choose SynthIt

A study system, not a research notebook

NotebookLM is built for exploring and querying a set of sources — it doesn't turn them into flashcards, a quiz, or a spaced-repetition review queue. SynthIt starts where NotebookLM stops: from a cited summary into an actual study routine.

Retention, not just a good answer

A great chat answer today doesn't mean you'll remember it next week. SynthIt's flashcards get real SM-2 scheduling, so what you generate becomes what you actually retain.

One flat plan

SynthIt Pro is one price for an unlimited library. NotebookLM's higher tiers are sold as part of broader Google AI subscriptions, which can mean paying for a lot you won't use just to raise a notebook or source limit.

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