q2
Ten releases in six days, methodically porting Quarto's surface into a Rust binary.
Comparison · Infra & APIs
carrier vs Depot
A side-by-side editorial comparison of carrier and Depot — release velocity, themes, recent moves, and the top alternatives to consider.
carrier vs Depot: at a glance
| Feature | carrier | Depot |
|---|---|---|
| Sector | Infra & APIs | Infra & APIs |
| Velocity score | 0.0 | 6.3 |
| Sparks · 30d | 0 | 1 |
| Top themes | r-package, serialization, remote-execution, r-lib | ci-cd, build-acceleration, test-intelligence, git-hosting |
| Last editorial update | 1h ago | 14h ago |
| Website | Visit → | — |
What is carrier?
carrier's 0.3.0 quietly rewrites how crated functions see each other — and breaks code that relied on the old rules.
carrier packages an R function together with the data it needs so it can be shipped to another process or machine. 0.3.0 changed the semantics of functions passed through ...: they are now re-crated inside the main crate environment instead of inheriting from wherever they were defined. That fixes helper functions failing to resolve each other remotely, and stops local environments dragging large objects into the payload.
What is Depot?
Depot keeps absorbing the CI stack — tests, networking, runners, now its own git host.
Depot has moved well past build caching. Test results reached general availability in July with org-wide flaky, slow, and recurring failure analytics plus timing-based shard splitting; Sherlock's AI analysis became available on any run rather than only failed ones; and CI jobs can join a Tailscale tailnet to reach private services. The runner fleet now defaults to macOS 26 on M4 hardware, Depot CI understands GitHub stacked pull requests, and Depot Code — a diskless git server backed by blob storage — entered private beta.
carrier vs Depot: editorial side-by-side
carrier
0.0INFRA · APIS
carrier's 0.3.0 quietly rewrites how crated functions see each other — and breaks code that relied on the old rules.
◆ Current state
carrier packages an R function together with the data it needs so it can be shipped to another process or machine. 0.3.0 changed the semantics of functions passed through ...: they are now re-crated inside the main crate environment instead of inheriting from wherever they were defined. That fixes helper functions failing to resolve each other remotely, and stops local environments dragging large objects into the payload.
◆ Where it's heading
Each release tightens the boundary between a crate and its surroundings. 0.2.0 introduced .parent_env defaulting to baseenv() to cut the crate off from the global search path and made unnamed ... arguments an error instead of a silent drop; 0.3.0 finishes the job by controlling the environment chain of the packed closures themselves. The package is trading backwards compatibility for predictable, self-contained payloads — a reasonable bet for something whose failures otherwise surface on a remote worker.
◆ Prediction
The 0.1.0 notes promised an automatic dependency-detection mode to replace explicit packing; nothing since has delivered it, and with the environment semantics now settled that is the obvious next move — though the entries give no date for it.
Depot
6.3INFRA · APIS
Depot keeps absorbing the CI stack — tests, networking, runners, now its own git host.
◆ Current state
Depot has moved well past build caching. Test results reached general availability in July with org-wide flaky, slow, and recurring failure analytics plus timing-based shard splitting; Sherlock's AI analysis became available on any run rather than only failed ones; and CI jobs can join a Tailscale tailnet to reach private services. The runner fleet now defaults to macOS 26 on M4 hardware, Depot CI understands GitHub stacked pull requests, and Depot Code — a diskless git server backed by blob storage — entered private beta.
◆ Where it's heading
The pattern is absorbing each adjacent piece of the pipeline that Depot's position already gives it data about. It runs the builds, so it owns test timing, so it can balance shards; it runs the jobs, so it can diagnose them; it hosts the runners, so it can wire private networking into them. Depot Code extends the same logic upstream to source hosting, which would close the loop between repository and runner. A quieter parallel thread keeps moving SDK- and dashboard-only settings into the CLI, stated explicitly as making projects configurable by agents and scripts.
◆ Prediction
Depot Code widening past private beta and binding more tightly to CI is the move the rest of the window sets up. The test work is also positioned to go from reporting to selection — skipping tests a change cannot affect — since Depot now holds the timing and failure history that would require, though the entries stop short of saying so.
Alternatives to carrier and Depot
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 carrier or Depot.
pkgcache
The metadata cache under pak now speaks to authenticated and corporate repositories.
packrat
R's old dependency manager now runs on a vendored copy of its own successor.
webfakes
A fake web server for tests that keeps closing the gap with the real thing.
pool
Hit 1.0, relicensed to MIT, and has shipped almost nothing but dbplyr compatibility since.
evaluate
The engine under every knitted R document reached 1.0 by making evaluation behave like the console.
See all carrier alternatives → · See all Depot alternatives →
Recent activity from carrier and Depot
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 4d agoDepotmacOS 26 is now the default macOS version for GitHub Actions runners
- 11d agoDepotDepot CI now supports native GitHub stacked pull requests
- 14d agoDepotSet cache retention when creating a project with --cache-policy-keep-days
- 15d agoDepotView and edit project details from the Depot CLI
- 16d agoDepotTest results are now generally available ⚡
- 24d agoDepotAI analysis available for all Depot CI workflows and jobs
- 11mo agocarrierCrated helper functions can now see each other ⚡
- 1y agocarriercrate() gains .parent_env and stricter argument handling
- 3y agocarrierSource references dropped from crated functions
- 4y agocarrierInitial release with explicit-only crate packing
Frequently asked questions
What is the difference between carrier and Depot?
They serve adjacent needs but don't currently overlap on shipped themes. Depot is currently shipping more aggressively (velocity 6.3 vs 0.0), with 1 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 carrier better than Depot?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Depot is currently shipping more aggressively (velocity 6.3 vs 0.0), with 1 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 carrier?
Top carrier alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "carrier alternatives" section above for the current picks, or visit /alternatives/carrier for the full list with editorial commentary on each.
What are the best alternatives to Depot?
Top Depot alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Depot alternatives" section above for the current picks, or visit /alternatives/depot for the full list with editorial commentary on each.