ChatPDF vs Logseq vs Perplexity AI vs Readr
| Attribute | ||||
|---|---|---|---|---|
| Category | AI Agents & Assistants | Note-taking & Knowledge | AI Agents & Assistants | Productivity & Collaboration |
| Pricing | Free tier | Free tier | Free tier | Free tier |
| Starting price | $19.99/month | $0/month | $20/month | Free |
| Free tier | Yes | Yes | Yes | Yes |
| Free trial | No | No | Yes | Unknown |
| Deployment | Cloud | — | Cloud | — |
| API available | Unknown | Unknown | Unknown | Unknown |
| Platforms | ios, android | — | — | — |
| Certifications | — | — | — | — |
| Integrations | — | 1 | — | — |
| Company | — | Founded 2020 | Founded 2022 | — |
| Feature attributes | ||||
Also consider
Unknown values show as “Unknown”/“—”. Nothing is inferred — see each tool page for sources.