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Comparison · Collab
Kagi Search vs SiYuan
A side-by-side editorial comparison of Kagi Search and SiYuan — release velocity, themes, recent moves, and the top alternatives to consider.
Kagi Search vs SiYuan: at a glance
| Feature | Kagi Search | SiYuan |
|---|---|---|
| Sector | Collab | Collab |
| Velocity score | 0.0 | 6.3 |
| Sparks · 30d | 0 | 0 |
| Top themes | search-api, assistant, mobile-apps, user-control | note-taking, ai-agent, mcp, semantic-search |
| Last editorial update | 6d ago | 13h ago |
| Website | — | Visit → |
What is Kagi Search?
Kagi is unbundling itself: search as an API, Assistant as an app, AI as a switch.
The dated part of this feed stops in April on housekeeping releases — reliability work, refinements, a Small Web expansion. Everything since sits in undated rows and is more substantial: the Search API went to public preview in May carrying each account's own lenses and blocklists, June started rebuilding search widgets, July added a global off-switch for AI in search, and July 30 put Kagi Assistant on iOS and Android as a standalone app.
What is SiYuan?
SiYuan's v3.8.0 train restates one AI feature set across seven consecutive builds.
SiYuan is deep in a v3.8.0 preview train — four alphas and three betas since August 1 — and every build republishes the same four headline features: an AI Agent, semantic search over AI embeddings with reranking, Model Context Protocol support, and OIDC authentication. Two pairs of these builds carry byte-identical published notes, so the per-build delta is not visible from the feed at all. What does vary is a long enhancement list covering sync, mobile platforms and database views.
Kagi Search vs SiYuan: editorial side-by-side
Kagi Search
0.0COLLAB
Kagi is unbundling itself: search as an API, Assistant as an app, AI as a switch.
◆ Current state
The dated part of this feed stops in April on housekeeping releases — reliability work, refinements, a Small Web expansion. Everything since sits in undated rows and is more substantial: the Search API went to public preview in May carrying each account's own lenses and blocklists, June started rebuilding search widgets, July added a global off-switch for AI in search, and July 30 put Kagi Assistant on iOS and Android as a standalone app.
◆ Where it's heading
Kagi is separating what used to be one subscription into distinct products with distinct surfaces: a search index other people can query, an assistant that lives on a phone, and a search page where the AI layer is optional. The through-line is user control — preferences that follow the API key, widgets that can be switched off individually, threads that can be exported or deleted in bulk — which is the one thing an ad-funded competitor cannot match on. Growth now depends on those surfaces rather than on convincing people to change their default search engine.
◆ Prediction
The Search API is the piece with launch details still outstanding, so expect it to leave preview with firm pricing and the beta users migrated; the mobile Assistant is described as a first step, which points to the missing platform features arriving next.
SiYuan
6.3COLLAB
SiYuan's v3.8.0 train restates one AI feature set across seven consecutive builds.
◆ Current state
SiYuan is deep in a v3.8.0 preview train — four alphas and three betas since August 1 — and every build republishes the same four headline features: an AI Agent, semantic search over AI embeddings with reranking, Model Context Protocol support, and OIDC authentication. Two pairs of these builds carry byte-identical published notes, so the per-build delta is not visible from the feed at all. What does vary is a long enhancement list covering sync, mobile platforms and database views.
◆ Where it's heading
The release notes are cumulative rather than incremental, which makes the train read as a single release delivered in installments. Beneath the repeated feature banner the actual work is platform breadth: LAN peer-assisted acceleration for cloud sync, audio recording on Android and HarmonyOS, custom font import on mobile, and configurable Stable, Beta and Alpha update channels. Reaching beta.3 within ten days of the first alpha says the train is converging.
◆ Prediction
A v3.8.0 stable release looks close given the move from first alpha to third beta inside ten days. The update-channel setting arriving in this same cycle suggests the project intends to keep running parallel preview streams once it ships.
Alternatives to Kagi Search and SiYuan
Other Collab products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either Kagi Search or SiYuan.
AFFiNE
A nightly canary train where the AI platform work hides between dependency bumps
Flame
Self-hosted dashboard that finished its feature arc and stopped shipping in 2023.
CommaFeed
A self-hosted RSS reader that now spends most of its release notes on security.
Jellyfin
Jellyfin renumbers to 12.0 and spends the whole cycle paying down its backend rewrite.
Teable
Teable is spending its release budget making bring-your-own-database failures survivable.
See all Kagi Search alternatives → · See all SiYuan alternatives →
Recent activity from Kagi Search and SiYuan
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoSiYuanThird v3.8.0 beta restating the AI Agent and MCP feature set
- 3d agoSiYuanSecond v3.8.0 beta, cumulative notes restated
- 3d agoSiYuanFirst v3.8.0 beta, notes identical to alpha.4
- 4d agoSiYuanFourth v3.8.0 alpha, notes identical to beta.1
- 5d agoSiYuanThird v3.8.0 alpha carries the database view work
- 6d agoSiYuanSecond v3.8.0 alpha, cumulative notes restated
- 4mo agoKagi Search- Tuning the Orchestra #
- 4mo agoKagi Search- Small Web Expansion and Translate goes viral # ⚡
- 5mo agoKagi Search- Smoothing the edges #
- 6mo agoKagi Search- Kagi Translate on Android & iOS: translate anything, anywhere # ⚡
- 6mo agoKagi Search- Assistant reliability upgrades and Search refinements #
- 6mo agoKagi Search- New Year tune-up: smoother everything! #
Frequently asked questions
What is the difference between Kagi Search and SiYuan?
They serve adjacent needs but don't currently overlap on shipped themes. SiYuan is currently shipping more aggressively (velocity 6.3 vs 0.0), with 0 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Kagi Search better than SiYuan?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. SiYuan is currently shipping more aggressively (velocity 6.3 vs 0.0), with 0 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Collab products to evaluate alongside.
What are the best alternatives to Kagi Search?
Top Kagi Search alternatives in Collab are ranked by recent ship velocity. Browse the "Kagi Search alternatives" section above for the current picks, or visit /alternatives/kagi for the full list with editorial commentary on each.
What are the best alternatives to SiYuan?
Top SiYuan alternatives in Collab are ranked by recent ship velocity. Browse the "SiYuan alternatives" section above for the current picks, or visit /alternatives/siyuan for the full list with editorial commentary on each.