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Comparison · Collab
Radarr vs SiYuan
A side-by-side editorial comparison of Radarr and SiYuan — release velocity, themes, recent moves, and the top alternatives to consider.
Shared themes:self-hosted
Radarr vs SiYuan: at a glance
What is Radarr?
Radarr is in steady maintenance, with one new download client the only visible addition
Radarr ships small builds on parallel develop and master branches, typically a handful of commits each. The recent stream is almost entirely correctness work — HTTP request disposal, deferred JSON deserialisation, malformed cookie handling, qBittorrent basic auth, an SQLite busy timeout raised to 1000ms — plus translation updates. The single functional addition is an RQBit download client.
What is SiYuan?
SiYuan stabilises 3.8.1 after a seven-build beta run, all of it widening the agent surface it opened in 3.8.0
SiYuan has just cut 3.8.1 stable, the endpoint of a beta chain that ran six builds in five days. The release groups into three areas: AI integration work - custom editor actions syncing across devices, an Agent panel shortcut, user-level skills read from a shared agents directory, nested rerank API formats and OpenAI Responses API support; editing and database throughput, including virtualised grouped-table rendering and faster document loading; and cross-platform reliability covering HEIF/HEIC previews, PDF export and mobile behaviour. A batch of MCP and publishing-service fixes rounds it out.
Radarr vs SiYuan: editorial side-by-side
Radarr
5.0COLLAB
Radarr is in steady maintenance, with one new download client the only visible addition
◆ Current state
Radarr ships small builds on parallel develop and master branches, typically a handful of commits each. The recent stream is almost entirely correctness work — HTTP request disposal, deferred JSON deserialisation, malformed cookie handling, qBittorrent basic auth, an SQLite busy timeout raised to 1000ms — plus translation updates. The single functional addition is an RQBit download client.
◆ Where it's heading
Version numbers are moving quickly through 6.1 to 6.4, but the changes behind them are patch-sized; the major.minor increments track branch mechanics rather than feature milestones. The work that is happening targets reliability under load and with third-party clients, which is where a long-running background service accumulates problems.
◆ Prediction
Expect the develop-branch build cadence to continue with further download client and indexer compatibility fixes; nothing here signals a larger release in preparation.
SiYuan
6.3COLLAB
SiYuan stabilises 3.8.1 after a seven-build beta run, all of it widening the agent surface it opened in 3.8.0
◆ Current state
SiYuan has just cut 3.8.1 stable, the endpoint of a beta chain that ran six builds in five days. The release groups into three areas: AI integration work - custom editor actions syncing across devices, an Agent panel shortcut, user-level skills read from a shared agents directory, nested rerank API formats and OpenAI Responses API support; editing and database throughput, including virtualised grouped-table rendering and faster document loading; and cross-platform reliability covering HEIF/HEIC previews, PDF export and mobile behaviour. A batch of MCP and publishing-service fixes rounds it out.
◆ Where it's heading
This is consolidation of the surface 3.8.0 opened, not an extension of it. The agent, semantic search and MCP endpoint arrived in the 3.8.0 line; 3.8.1 makes them portable and pluggable - skills come from a directory the user controls, editor actions follow the user between devices, and the provider layer now speaks the OpenAI Responses API rather than one bespoke shape. The high beta count against a modest final diff shows a project stabilising a young subsystem rather than building a new one.
◆ Prediction
The next line most likely pushes on the skills directory - discovery, sharing or marketplace distribution of user-level skills - since that is the piece 3.8.1 made user-editable without giving it a distribution path.
Alternatives to Radarr 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 Radarr or SiYuan.
Read the Docs
Read the Docs is rebuilding its build farm around uv and isolated builders, one week at a time.
CommaFeed
CommaFeed is patching its way through the attack surface a self-hosted reader inherits
Hive
Hive ships in batches, and this one is all planning accuracy and admin control.
Teable
Teable ships daily, and the work has moved from grid features to platform governance.
Simpplr
Simpplr publishes the research that names the gap, then ships the product that closes it.
See all Radarr alternatives → · See all SiYuan alternatives →
Recent activity from Radarr and SiYuan
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoSiYuanSiYuan 3.8.1 stabilises the agent, skills and Responses API work
- 2d agoSiYuanSlash menu items become configurable; table column widths distribute evenly
- 2d agoSiYuanTable headers left-align by default; double-click closes tabs
- 3d agoSiYuanUser-level agent skills and virtualized grouped-table rendering
- 4d agoSiYuanAI features move to the OpenAI Responses API
- 4d agoSiYuanAgent panel gains a shortcut; blockquote input fixed
- 17d agoRadarrRadarr 6.4.1: RQBit download client support
- 23d agoRadarrRadarr 6.4.0 build 10540: HTTP and JSON handling cleanup
- 1mo agoRadarrRadarr 6.4.0 develop bump and cookie handling fix
- 1mo agoRadarrRadarr 6.3.0 master build: translations and CI fix
- 1mo agoRadarrRadarr 6.3.0 develop build: streaming extension probe fix
- 2mo agoRadarrRadarr 6.2.1: qBittorrent basic auth and SQLite timeout fixes
Frequently asked questions
What is the difference between Radarr and SiYuan?
Both compete on the same themes — self-hosted — within Collab. SiYuan is currently shipping more aggressively (velocity 6.3 vs 5.0), 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 Radarr 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 5.0), 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 Radarr?
Top Radarr alternatives in Collab are ranked by recent ship velocity. Browse the "Radarr alternatives" section above for the current picks, or visit /alternatives/radarr 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.