Heptabase vs Notesium
Heptabase
heptabase.comNotesium
notesium.comSide by side
| Figure | Heptabase | Notesium |
|---|---|---|
| Price from | $8.99/mo | Free |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | — | Yes |
| Plans published | 9 | 1 |
| Spec score · Personal Knowledge Management Software | 8.9 (#3) | 8.7 (#7) |
| Integrations | The site shows Readwise and Zotero integrations; its help center says Zotero sync is one-way, manually initiated, and skips attachments over 100 MB. | Notesium provides a Vim/Neovim plugin that uses its CLI for note finding and preview. |
| Supported platforms | web,windows,macos,linux,ios,android,chrome_extension | The maker says Notesium runs locally on Linux, macOS, and Windows. |
| Security | For the AWS cloud storage described in its help article, Heptabase says data is encrypted in transit and at rest, with AWS server-side AES-256 encryption and SSL/TLS transfers; it clarifies this is not end-to-end encryption. | The installation guide instructs users to verify downloaded binaries against published SHA-256 checksums. |
Plans
Heptabase
- Pro$11.99 a month
- Pro$107.88 a year
- Premium$23.99 a month
- Premium$215.88 a year
- Premium+$71.99 a month
- Premium+$647.88 a year
- Pro$8.99 a month
- Premium$17.99 a month
- Premium+$53.99 a month
In their own words
Heptabase
Heptabase is a visual knowledge base for students, researchers, and lifelong learners. Whiteboards and cards support visual thinking, while a block-based editor, bidirectional links, PDF annotation, daily journals, and a web clipper help organize material. Its AI can explain sources, take notes, and organize a knowledge base from PDFs, YouTube, notes, and journals. Heptabase supports web, Windows, macOS, Linux, iOS, Android, and a Chrome extension, and lists integrations with Readwise and Zotero. The free plan is available through collaboration, allowing edits to shared whiteboards and cards but excluding personal libraries, journals, tag databases, tasks, highlights, and AI features. The desktop app stores data locally, and notes and files are accessible offline. For AWS cloud storage, the company describes encryption in transit and at rest, but not end-to-end encryption. After a subscription or trial ends, users can access and export content indefinitely; creating or editing notes requires renewal. Paid plans start at $8.99/user/mo (annual), with a 7-day trial.