Tolstoy is a powerful interactive-video platform, branching video, shoppable commerce flows, quizzes. It's a rich toolkit, especially for ecommerce.
Where they differ
Nook is narrower on purpose: one host, answering the handful of questions that matter on each page, as tap-to-play clips. Less to configure, faster to launch, and laser-focused on removing doubt.
Side by side
Scope: Tolstoy is a broad interactive-video suite; Nook does Q&A answers and does it simply. Setup: Nook is one script tag and a few recordings. Targeting: Nook surfaces questions per page automatically. Both support branching from one clip to the next.
Which to choose
Reach for Tolstoy when you want full shoppable/interactive video production. Choose Nook when you just want a trustworthy human answering "why you?" and "how much?", live in an afternoon.
Comparisons reflect each product's primary use case at the time of writing; check their sites for the latest.