zarr-python
Zarr's package split keeps producing standalone tools: a server, now a lazy indexer.
Comparison · DevOps
htmltools vs httpuv
A side-by-side editorial comparison of htmltools and httpuv — release velocity, themes, recent moves, and the top alternatives to consider.
Shared themes:shinymaintenance
htmltools vs httpuv: at a glance
What is htmltools?
htmltools spends three releases walking back its own fill-layout opinions
htmltools generates the HTML that Shiny, bslib and R Markdown emit. Recent releases are dominated by one project - the fill and fillable layout system that powers bslib cards - being tuned release after release, surrounded by fixes for whatever testthat or R-devel changed underneath.
What is httpuv?
httpuv ships almost nothing, which is what you want from the web server under Shiny
httpuv is the C++ HTTP and WebSocket server that Shiny runs on. Across this window it added exactly one user-facing function - runStaticServer() for serving a directory - and spent every other release on race conditions, compiler and linker changes, CRAN check warnings, and mime type table updates.
htmltools vs httpuv: editorial side-by-side
htmltools
0.0DEVOPS
htmltools spends three releases walking back its own fill-layout opinions
◆ Current state
htmltools generates the HTML that Shiny, bslib and R Markdown emit. Recent releases are dominated by one project - the fill and fillable layout system that powers bslib cards - being tuned release after release, surrounded by fixes for whatever testthat or R-devel changed underneath.
◆ Where it's heading
The fill work is converging rather than expanding: 0.5.6 stopped forcing overflow on fillable containers, 0.5.7 stopped forcing full width on fill items, and 0.5.8 lowered the CSS's precedence by moving it into a named cascade layer. Each step removes an opinion that broke someone's layout. The two most recent releases add nothing at all beyond test compatibility.
◆ Prediction
With the fill CSS now scoped to its own cascade layer, expect fewer layout corrections and a continued pattern of small releases driven by testthat and R-devel rather than new API.
httpuv
0.0DEVOPS
httpuv ships almost nothing, which is what you want from the web server under Shiny
◆ Current state
httpuv is the C++ HTTP and WebSocket server that Shiny runs on. Across this window it added exactly one user-facing function - runStaticServer() for serving a directory - and spent every other release on race conditions, compiler and linker changes, CRAN check warnings, and mime type table updates.
◆ Where it's heading
There is no direction here in the usual sense, and that is the honest read: the package is a stable foundation whose releases are triggered by the toolchain moving, by R-devel warnings, or by a threading bug surfacing under load. The one recurring theme with substance is connection reliability - WebSocket keepalive pings, race conditions in the I/O thread - which is what actually breaks Shiny apps in production.
◆ Prediction
Expect continued small releases tracking Rtools, R-devel and mime data, with any substantive change most likely coming from a threading or WebSocket issue reported by Shiny users rather than from planned work.
Alternatives to htmltools and httpuv
Other DevOps 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 htmltools or httpuv.
ellipsis
ellipsis' checks live in rlang now; the package is a compatibility shim.
clock
clock is turning calendar conventions lubridate hard-coded into parameterized types.
promises
promises drops R6 for plain environments and wires async work into OpenTelemetry
withr
withr rebuilt defer() on base R's own on.exit(), and got much faster for it
xml2
xml2 relicensed to MIT, then moved its hot accessors from S3 into C
See all htmltools alternatives → · See all httpuv alternatives →
Recent activity from htmltools and httpuv
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 8mo agohtmltoolsTest fix for testthat 3.3.0
- 8mo agohtmltoolscapturePlot() examples run only interactively
- 1y agohttpuvServes .wasm as application/wasm; mime table refreshed
- 2y agohttpuvrunStaticServer() survives a failed browser launch
- 2y agohtmltoolsFill CSS moves into its own cascade layer
- 2y agohttpuvRtools build file update and macOS zlib linking fix
- 2y agohttpuvFixes an R CMD check warning on error format strings
- 2y agohtmltoolssave_html() becomes generic; css() passes CSS variables through
- 2y agohttpuvrunStaticServer() serves a directory of static files
- 2y agohtmltoolstagQuery() no longer errors traversing NULL on r-devel
- 3y agohtmltoolsFillable containers stop forcing overflow, respect intrinsic size
- 3y agohttpuvFixes a race condition introduced in 1.6.10
Frequently asked questions
What is the difference between htmltools and httpuv?
Both compete on the same themes — shiny, maintenance — within DevOps. htmltools and httpuv are shipping at a similar cadence (velocity 0.0 vs 0.0, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is htmltools better than httpuv?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. htmltools and httpuv are shipping at a similar cadence (velocity 0.0 vs 0.0, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other DevOps products to evaluate alongside.
What are the best alternatives to htmltools?
Top htmltools alternatives in DevOps are ranked by recent ship velocity. Browse the "htmltools alternatives" section above for the current picks, or visit /alternatives/htmltools for the full list with editorial commentary on each.
What are the best alternatives to httpuv?
Top httpuv alternatives in DevOps are ranked by recent ship velocity. Browse the "httpuv alternatives" section above for the current picks, or visit /alternatives/httpuv for the full list with editorial commentary on each.