AI Research Tools: Free and Paid Research Assistants Compared
Compare AI research tools by free access, research focus, paid options, and best use. The list includes literature search, paper discovery, citation analysis, evidence synthesis, and research assistants.
Last verified: September 7, 2026.
| Tool | Free | Research Focus | Paid From | Best For | Source |
|---|---|---|---|---|---|
| Connected Papers | Free | Citation graph | Free / paid options | Paper discovery | ↗ |
| Consensus | Limited | Evidence search | Paid plans | Scientific questions | ↗ |
| Dimensions | Free / limited | Research discovery | Paid plans | Research analytics | ↗ |
| Elicit | Free | Literature review | $11/mo annual | Research synthesis | ↗ |
| Inciteful | Free | Citation discovery | Free | Citation networks | ↗ |
| Iris.ai | Trial / limited | Research mapping | Paid plans | Literature discovery | ↗ |
| Keenious | Trial / limited | Research recommendations | Paid plans | Academic discovery | ↗ |
| Lens.org | Free | Scholarly + patent search | Free | Research + patents | ↗ |
| Litmaps | Free | Literature mapping | Paid plans | Tracking related papers | ↗ |
| Perplexity | Free | Web research | Pro available | Cited research | ↗ |
| ResearchRabbit | Free | Paper discovery | Free | Visual literature exploration | ↗ |
| Scholarcy | Free / limited | Paper summarization | Paid plans | Reading papers | ↗ |
| SciSpace | Limited | Paper reading + search | Paid plans | Explaining papers | ↗ |
| Scite | Limited | Citation context | Paid plans | Citation checking | ↗ |
| Semantic Scholar | Free | Academic search | Free | Finding papers | ↗ |
| Zotero | Free | Reference management | Storage plans | Citation management | ↗ |
Terms, pricing, eligibility and availability can change. Check the ↗ source for current details.
