Shortlist by what you need
Start here if you know why you are leaving Mendeley.
Want the closest match?
ResearchRabbitMost similar to Mendeley in what it does, its category and its price.
Visit (opens ResearchRabbit in a new tab)Need a free plan?
UndermindHas a free plan, rated 4.4 out of 5.
Visit (opens Undermind in a new tab)Want the lowest price?
PetalFrom $4/mo, the lowest starting price here.
Visit (opens Petal in a new tab)Want the best rated?
PapersRated 4.2 out of 5 in our review, against 3.7 for Mendeley.
Visit (opens Papers in a new tab)
At a glance
Green means better than Mendeley, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 MendeleyBaseline | 3.7 | Free | Yes | AI interprets the logic behind your search queries and surfaces patterns and missing links across your entire reference library, not just keyword matches. | |
| ResearchRabbit | 4.6+0.9 | Free | Yes | A free, continuously updating visual map of papers as your collection grows | vs Mendeley |
| Undermind | 4.4+0.7 | $20/mo | Yes | Refines a literature search through follow-up questions, built by MIT physics PhDs | vs Mendeley |
| Papers | 4.2+0.5 | $5.42/mo | No | Reference manager with an AI research assistant for querying and organizing academic literature. | vs Mendeley |
| Petal | 4.2+0.5 | $4/mo | Yes | MIT-founded document platform with a free reference-manager component | vs Mendeley |
 PaperJet | 3.4−0.3 | Free | Yes | Searches the literature and drafts beside it on the same canvas. | vs Mendeley |
 Otio AI | 4.0+0.3 | $7/mo | Yes | Research assistant that works across hundreds of sources in one workspace | vs Mendeley |
 Sourcely | 4.2+0.5 | $17/mo | Yes | Paste a whole essay draft, get back citation-worthy sources matched to specific passages | vs Mendeley |
 PaperBrain | 3.6−0.1 | Free | Yes | Search, read and summarise scientific papers through a single interface. | vs Mendeley |
The alternatives in detail
In order of how closely each one matches Mendeley.
ResearchRabbit
4.6Free
vs Mendeley+0.9
A free, continuously updating visual map of papers as your collection grows.
- Continuously updating recommendations based on a growing paper collection
- Visual network of authors and citation connections
- Completely free with no paid tier
Completely free with no paid tier at all
No paid tier means no path to additional enterprise features
Undermind
4.4$20/mo
vs Mendeley+0.7
Refines a literature search through follow-up questions, built by MIT physics PhDs.
- Conversational, follow-up-question-driven search refinement
- Full-text search beyond just paper abstracts
- Founded by two MIT-trained quantum-physics PhDs
Follow-up-question refinement addresses vague or broad initial queries well
Significantly higher usage limits require a paid plan
Papers
4.2$5.42/mo
vs Mendeley+0.5
Reference manager with an AI research assistant for querying and organizing academic literature.
- AI assistant that answers questions across multiple papers at once
- Citation management with support for major academic formatting styles
- PDF annotation and library organization tools
Nearly two decades of product history behind the reference-manager core
No permanent free tier, only a 30-day trial
Petal
4.2$4/mo
vs Mendeley+0.5
MIT-founded document platform with a free reference-manager component.
- Chat interface across a shared, uploaded document library
- Petal CITE, a free cloud-native reference manager
- Founded in 2018 by MIT graduate researchers
Petal CITE provides genuinely free reference management, not just a limited trial
More features require a paid plan
PaperJet
3.4Free
vs Mendeley−0.3
Searches the literature and drafts beside it on the same canvas.
- Single search across academic papers
- Libraries for organising gathered sources
- Canvas for drafting alongside the literature
Keeps the link between a source and the claim it supports
'All papers' coverage claims are never quite true
Otio AI
4.0$7/mo
vs Mendeley+0.3
Research assistant that works across hundreds of sources in one workspace.
- Summarisation across hundreds of collected sources
- Question answering spanning an entire library
- Support for papers, articles, video and web links
Handles a whole corpus instead of one document per chat
Synthesised claims need verifying against originals before citing
Sourcely
4.2$17/mo
vs Mendeley+0.5
Paste a whole essay draft, get back citation-worthy sources matched to specific passages.
- Paste a full essay or draft to match passages with citation-worthy sources
- Citation generation across 700+ citation styles
- Database of 200+ million research papers
Passage-matching input approach is genuinely different from keyword search
Free tier's 300-character limit is restrictive for anything beyond a short excerpt
PaperBrain
3.6Free
vs Mendeley−0.1
Search, read and summarise scientific papers through a single interface.
- Search across scientific literature from one interface
- Summaries to triage whether a paper deserves a full read
- Content generation from the papers you collect
Compresses the triage step that dominates a literature review
Summaries are a filter, never a substitute for the source
FAQ
Questions people ask
Is Mendeley free?
Mendeley has a free plan.
What is the best free alternative to Mendeley?
ResearchRabbit is the highest-rated alternative here with a free plan (4.6 out of 5). Other free options: Undermind, Petal, Sourcely.
What is the cheapest alternative to Mendeley?
Among paid plans, Petal has the lowest starting price (from $4/mo). If you need it free, start with ResearchRabbit.
How did you pick these alternatives?
We match tools on what they do, their category and their price, using the details in our directory. Ratings come from our reviews and reader reviews.