If you're looking for another Summarist.ai alternative, BooksAI is worth a look. This mobile app uses ChatGPT to generate more than 40 million AI summaries of books, with options for spoiler-free, spoiler-heavy and hybrid summaries. It also suggests AI-recommended books based on your reading history and works in nine languages, so it's a good choice for readers who want to explore books from different countries.
If you're doing academic research, Scholarcy offers AI summarization and analysis specifically for academic papers. It can convert dense documents into interactive summary flashcards, and it's got tools for note taking and highlighting, too. That makes it a good tool for students and researchers who want to get more out of their time.