Logically vs Petal
Logically
logically.app
Petal
petal.orgSide by side
| Figure | Logically | Petal |
|---|---|---|
| Price from | $1/mo | $2.55/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Plans published | 2 | 4 |
| Spec score · Citation generators | 8.6 (#9) | 8.0 (#21) |
| Spec score · AI Citation Generators | 8.2 (#11) | 7.8 (#17) |
| Spec score · Reference Management Software | 8.2 (#11) | 7.9 (#17) |
| Spec score · Citation Management Software | 8.2 (#10) | 7.8 (#21) |
| Citation styles | Logically says it supports more than 10,000 citation styles for citations and bibliographies. | The citation generator supports over 10,000 citation styles and can copy citations or export them as BibTeX or Word. |
| Collaboration | Users can create shared libraries, invite others, and set permissions for collaborators. | Shared workspaces support collaboration on group projects, co-authored papers, and reviews. |
| Founded | 2023 | 2021 |
| Reference imports | Users can import reference data from Zotero, Mendeley, and EndNote using RIS, BibTeX, or CFF files. | Petal says it can import by DOI, PMID, ArXivID, ISBN, ISSN, and EAN lookup and capture metadata from URLs. |
| Research assistant | Its AI research assistant can search, summarize, and compare references across libraries with inline citations and data sources. | Petal describes itself as an AI-powered research assistant for academia that helps narrow literature reviews and compare studies. |
| Support | The pricing page lists a Help Center and priority human support among its customer-success features. | The FAQ says Petal generally responds to customer support requests within 30 minutes. |
Plans
In their own words
Logically
Logically is a research workspace for managing references, reviewing literature, annotating files, taking notes, and writing papers. Its AI assistant can search, summarize, and compare references across libraries, with inline citations and data sources. The reference manager accepts PDF, DOCX, TXT, MDOWN, EPUB, and PPTX files, along with URLs and DOIs. Users can import reference data from Zotero, Mendeley, and EndNote in RIS, BibTeX, or CFF formats. Semantic Scholar Mode draws on a database of 200 million peer-reviewed papers, and Logically says it supports more than 10,000 citation styles. Shared libraries, invitations, and collaborator permissions support group work. The free Cite Extension inserts citations and bibliographies from a Logically library into Microsoft Word; compatibility includes Word on the web, Word 2019 or later on Mac, and Word with Microsoft 365 on Mac or Windows. Logically runs as an extension, on macOS and Windows, and on the web. Free costs nothing and includes 100MB storage with daily AI-use limits. Unlimited is listed at $12 a year, billed at $12 per user/month yearly.
Petal
Petal is a web-based research assistant and reference manager for academic work, also available as a browser extension. Its plans include a free tier and paid options listed from $4.99/user/mo (annual). It helps users narrow literature reviews and compare studies, while providing a library for uploading and organizing PDFs with collections, metadata, and tags. AI tools offer translation, summaries, explanations, key-point extraction, suggestions for questions and search terms, and conversational assistance. Shared workspaces support group projects, co-authored papers, and reviews. The citation generator supports more than 10,000 styles and can copy citations or export them to BibTeX or Word. References can be brought in through identifiers such as DOI, PMID, ArXivID, ISBN, ISSN, and EAN, or by capturing metadata from URLs. Browser add-ins are listed for Chrome, Firefox, and Safari, alongside a Word add-in for citations and bibliographies. The free plan includes 1 GB storage, one seat, three guests, 400 AI credits, two collections, and three annotations per document; citation export is not included.