kwb.pkgbuild
kwb.pkgbuild's CI templates went four years without a refresh, then had to be rebuilt for current runners
Comparison · Infra & APIs
rextendr vs Windmill
A side-by-side editorial comparison of rextendr and Windmill — release velocity, themes, recent moves, and the top alternatives to consider.
rextendr vs Windmill: at a glance
What is rextendr?
rextendr put Rust-backed R packages in the browser, then tore itself down for a 1.0.0 rebuild
rextendr is the R-side toolchain for extendr, scaffolding and compiling R packages with Rust internals. The package is mid-teardown: the 0.4-final tag in October 2025 warns that main may not work as expected and directs users to install from that tag, and April 2026's release is titled as one more developer release before 1.0.0. Meanwhile the CRAN-facing 0.4.x line did the substantive work.
What is Windmill?
Windmill gave away the warehouse connectors and now runs dbt natively — the trial is the strategy.
In a single fortnight Windmill moved BigQuery and Snowflake out of the Enterprise license and made dbt projects a first-class runtime executing on the customer's own workers. Around that, deployment got simpler — one target derived from workspace lineage, compare-and-deploy into any workspace — and the AI session surface keeps thickening: markdown artifacts, then version history over those artifacts with the assistant able to read past versions.
rextendr vs Windmill: editorial side-by-side
rextendr
0.0INFRA · APIS
rextendr put Rust-backed R packages in the browser, then tore itself down for a 1.0.0 rebuild
◆ Current state
rextendr is the R-side toolchain for extendr, scaffolding and compiling R packages with Rust internals. The package is mid-teardown: the 0.4-final tag in October 2025 warns that main may not work as expected and directs users to install from that tag, and April 2026's release is titled as one more developer release before 1.0.0. Meanwhile the CRAN-facing 0.4.x line did the substantive work.
◆ Where it's heading
Two threads run in parallel. The first is reach: 0.4.0 added WebR support out of the box for all extendr packages by enabling the wasm32-unknown-emscripten target, and 0.4.2 followed with the panic and link-time-optimization settings needed to make those builds actually work. The second is CRAN compliance — use_cran_defaults(), vendor_pkgs(), automatic SystemRequirements fields, and configure scripts, all aimed at getting Rust-powered packages accepted on CRAN. The rebuild announced in 0.4-final is a third thread whose shape the entries do not reveal.
◆ Prediction
The stated destination is 1.0.0 built on the new Makevars-linked build process, so that release is the next milestone. What the revamp changes for existing extendr packages is not described in any entry here.
Windmill
8.8INFRA · APIS
Windmill gave away the warehouse connectors and now runs dbt natively — the trial is the strategy.
◆ Current state
In a single fortnight Windmill moved BigQuery and Snowflake out of the Enterprise license and made dbt projects a first-class runtime executing on the customer's own workers. Around that, deployment got simpler — one target derived from workspace lineage, compare-and-deploy into any workspace — and the AI session surface keeps thickening: markdown artifacts, then version history over those artifacts with the assistant able to read past versions.
◆ Where it's heading
The community edition is being loaded up with exactly what a data team needs to run a real trial: warehouse connectors, an unmodified dbt project, storage quota instead of an upload cap. Enterprise is being repositioned around scale and governance rather than feature access. The AI sessions track is developing on its own clock, moving from chat toward durable, versioned work products that survive a session.
◆ Prediction
Expect AI session artifacts to gain server-side persistence and sharing, since they are still stored in the browser and tied to the session. On the data side, the dbt runtime is likely to grow scheduling and lineage integration with the pipelines alpha rather than staying a standalone script language.
Alternatives to rextendr and Windmill
Other Infra & APIs 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 rextendr or Windmill.
saperlipopette
saperlipopette turned Git disasters into practice exercises, then passed peer review
rdocdump
rdocdump grew from a CRAN doc dumper into a resolver that pulls packages from anywhere
nominatimlite
nominatimlite's real work was self-hosting and caching; 0.6.0 is an internal refactor with no API change
osrm.backend
osrm.backend stopped trusting upstream binaries and started shipping its own
taxifydb
taxifydb found that its coverage audit was checking a hand-maintained list, not reality.
See all rextendr alternatives → · See all Windmill alternatives →
Recent activity from rextendr and Windmill
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 5d agoWindmillNested filter groups and dotted paths in trigger filters
- 6d agoWindmillVersion history for AI session artifacts
- 15d agoWindmillRun dbt projects as a first-class Windmill runtime ⚡
- 17d agoWindmillCompare & Deploy into any workspace
- 17d agoWindmillOne deployment target, derived from the workspace lineage
- 22d agoWindmillBigQuery and Snowflake available in the community edition ⚡
- 3mo agorextendrNew Makevars-linked build process ahead of 1.0.0
- 9mo agorextendrFinal development tag before the rewrite; template and SystemRequirements changes
- 11mo agorextendrextendr-api version pinning and WebR-compatible build profile
- 1y agorextendrFix tests executed on CRAN
- 1y agorextendrWebR support out of the box for all extendr packages ⚡
- 3y agorextendrPackage templates updated for Rust 1.70
Frequently asked questions
What is the difference between rextendr and Windmill?
They serve adjacent needs but don't currently overlap on shipped themes. Windmill is currently shipping more aggressively (velocity 8.8 vs 0.0), with 2 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 rextendr better than Windmill?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Windmill is currently shipping more aggressively (velocity 8.8 vs 0.0), with 2 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Infra & APIs products to evaluate alongside.
What are the best alternatives to rextendr?
Top rextendr alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "rextendr alternatives" section above for the current picks, or visit /alternatives/rextendr for the full list with editorial commentary on each.
What are the best alternatives to Windmill?
Top Windmill alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Windmill alternatives" section above for the current picks, or visit /alternatives/windmill for the full list with editorial commentary on each.