httpuv
httpuv ships almost nothing, which is what you want from the web server under Shiny
Comparison · DevOps
promises vs zip
A side-by-side editorial comparison of promises and zip — release velocity, themes, recent moves, and the top alternatives to consider.
promises vs zip: at a glance
What is promises?
promises drops R6 for plain environments and wires async work into OpenTelemetry
promises supplies the async primitives behind Shiny and plumber. After years of small domain and future() fixes, the last two releases changed both what a promise costs and what it can report: 1.4.0 corrected nested domain ordering and added the first OpenTelemetry integration, and 1.5.0 replaced the R6 promise class with a classed environment while stabilizing the tracing API.
What is zip?
zip 3.0 added encryption, turning a plumbing package into a complete archive tool.
zip creates and extracts archives from R without depending on external tools. Its 2.x line was incremental — a type column in zip_list(), symlink handling on Unix, hidden shared-library symbols. Version 3.0.0 changed the package's shape by adding password-protected archives and vectorized extraction.
promises vs zip: editorial side-by-side
promises
0.0DEVOPS
promises drops R6 for plain environments and wires async work into OpenTelemetry
◆ Current state
promises supplies the async primitives behind Shiny and plumber. After years of small domain and future() fixes, the last two releases changed both what a promise costs and what it can report: 1.4.0 corrected nested domain ordering and added the first OpenTelemetry integration, and 1.5.0 replaced the R6 promise class with a classed environment while stabilizing the tracing API.
◆ Where it's heading
Two things are being fixed at once. Promise domains - the mechanism that carries context across async boundaries - have been the source of nearly every bug in this window, and they are now being used deliberately as the vehicle for tracing rather than just for error handling. Meanwhile the object itself is being made cheap enough to create in volume.
◆ Prediction
Expect the OpenTelemetry surface to lose its experimental label and pick up the same span coverage Shiny would need end to end; the deprecated ospan function names should be removed in a following release.
zip
2.5DEVOPS
zip 3.0 added encryption, turning a plumbing package into a complete archive tool.
◆ Current state
zip creates and extracts archives from R without depending on external tools. Its 2.x line was incremental — a type column in zip_list(), symlink handling on Unix, hidden shared-library symbols. Version 3.0.0 changed the package's shape by adding password-protected archives and vectorized extraction.
◆ Where it's heading
Development is moving from listing and extracting toward parity with what users expect of a general archive utility: encryption schemes including WinZIP AES-256, an encryption column so an archive can be inspected before extraction, and thread counts that respect the session's Ncpus setting. The 3.0.x releases since are consolidation on that new surface.
◆ Prediction
Expect continued refinement of the encryption and threading paths, with remaining symlink and permission edge cases on Unix the most likely source of the next fixes.
Alternatives to promises and zip
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 promises or zip.
withr
withr rebuilt defer() on base R's own on.exit(), and got much faster for it
htmltools
htmltools spends three releases walking back its own fill-layout opinions
xml2
xml2 relicensed to MIT, then moved its hot accessors from S3 into C
httr
httr's last releases are housekeeping - the package now points users at httr2
magrittr
magrittr rewrote its pipe in C, then base R shipped one and the releases stopped
See all promises alternatives → · See all zip alternatives →
Recent activity from promises and zip
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 8d agozipzip 3.0.2 handles symlinks whose targets extract later
- 1mo agozipzip 3.0.1 renames the progress option and respects Ncpus
- 2mo agozipzip 3.0.0 adds AES-256 password-protected archives ⚡
- 9mo agopromisesOpenTelemetry spans across async work; R6 dropped for environments ⚡
- 9mo agopromisesNested promise domains fixed; then() gains a tee argument
- 1y agopromisesRealigns future object creation with the future package
- 1y agozipzip 2.3.3 creates symbolic links correctly on Unix
- 1y agozipzip 2.3.2 returns a tibble from zip_list()
- 1y agopromisesFixes stack overflow on long promise chains
- 1y agopromisesFixes domains forgotten inside nested handlers
- 2y agozipzip 2.3.1 hides shared library symbols to avoid clashes
- 3y agopromisesfuture_promise() returns early when workers are exhausted
Frequently asked questions
What is the difference between promises and zip?
They serve adjacent needs but don't currently overlap on shipped themes. zip is currently shipping more aggressively (velocity 2.5 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 promises better than zip?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. zip is currently shipping more aggressively (velocity 2.5 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 DevOps products to evaluate alongside.
What are the best alternatives to promises?
Top promises alternatives in DevOps are ranked by recent ship velocity. Browse the "promises alternatives" section above for the current picks, or visit /alternatives/promises for the full list with editorial commentary on each.
What are the best alternatives to zip?
Top zip alternatives in DevOps are ranked by recent ship velocity. Browse the "zip alternatives" section above for the current picks, or visit /alternatives/zip-r for the full list with editorial commentary on each.