WikiBrain vs Hjarni
The closest neighbour: both are hosted Markdown knowledge bases with MCP. The differences are whether anything compiles for you, and price.
Choose Hjarni if
You want a clean hosted note store that many AI clients read and write, decide yourself (or via your agent) how each note is written, and need email-to-note and native mobile apps.
Choose WikiBrain if
You want sources compiled into a wiki by rules, with the index and log kept current, plus bibliography, graph and lint, at US$6 rather than 12.
| Feature | Hjarni | WikiBrain |
|---|---|---|
| Mechanism | Storage: “nothing is automatic”, you or your AI write notes deliberately | Compilation: raw/wiki/schema layers with Ingest, Query and Lint built in |
| Agent access | MCP with OAuth or token; listed in the Claude and ChatGPT connector directories | MCP with OAuth 2.1 + DCR or token; paste the URL into Claude.ai/ChatGPT (directory listing in progress) |
| Bibliography | Not offered | DOI/Crossref, BibTeX/CSL, [@citekey], Zotero sync, researcher template |
| Graph and versions | No graph; 30-day trash versions | Graph (filters, timeline), a version per save, rollback |
| Mobile | iOS and Android apps | PWA (add to home screen); native apps planned |
| Interface language | Traditional Chinese not found | Traditional Chinese and English |
| Price | Free 25 notes; Pro about US$12/month or 120/year | Free 200 notes; Pro US$6/month or 60/year |
| Export and source | Markdown bundle export; not open source | Markdown zip; AGPL-3.0, self-hostable |
Trade-offs we admit
- Hjarni launched earlier; directory listings, email-to-note and native apps are things we do not have yet.
- WikiBrain’s auto-ingest needs your own model key (or the first 10 trial runs); Hjarni runs no model, so it has no such cost.
- The other product’s features and prices are as published on its site; “not found” means not found on the check date, not necessarily absent.
Start free (14-day Pro trial)Their facts checked on 2026-09-04 · Hjarni Website