Decision Support · Side-by-side
Compare pricing, strengths, and use cases so it is easier to pick the right fit.
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Petal
Best overallFor most everyday users who need to quickly digest research papers and listen to summaries on the go, Paper Digest wins for speed and mobile audio. However, if you manage a large library of documents and need to synthesize across multiple papers, Petal offers better citation accuracy and a more generous free tier. The single biggest difference is that Paper Digest excels at fast, single-paper summaries with audio, while Petal shines at multi-document synthesis and library management.
Paper Digest
Petal
Scores at a glance
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Key differences
Facts side by side
| Paper Digest | Petal | |
|---|---|---|
| Free plan | ||
| Mobile app | ||
| API access |
Common questions
Yes, Paper Digest is faster for single-paper summaries, especially if you have a DOI or ArXiv link. Petal is slower because it first indexes the document into your library.
Paper Digest has no mobile app, but its website works on a phone browser and offers audio summaries you can listen to. Petal has a mobile app, but it lacks full PDF editing features.
Petal has a more generous free tier and paid plans start at $2.55/month. Paper Digest's pricing is unclear, but its free tier is very limited, so you'll likely need to pay for regular use.
Petal handles legal and humanities papers more accurately because its citation extraction and cross-document synthesis are more robust. Paper Digest sometimes misses nuances in non-STEM fields.
Petal exports to BibTeX and CSV and integrates directly with Zotero and Mendeley. Paper Digest exports to reference managers like Zotero and Mendeley but requires manual steps.
Paper Digest wins for speed and audio; Petal wins for library management and multi-paper synthesis.
If you just want to quickly understand a single paper and maybe listen to it on your commute, start with Paper Digest. But if you're building a research library, writing a literature review, or working across many documents, Petal gives you more value for your time and money. Both are worth trying on their free tiers to see which fits your workflow.
Detail pages: Paper Digest · Petal
