.capnp
1 claimant
1 primary
0 secondary
unambiguous primary
SWH popularity
Distinct files in the full Software Heritage archive (2026-06-04 export), dated by first appearance, following Desmazières, Di Cosmo, Lorentz (MSR 2025). Case-aggregated. citation.
38.2K
total files
19.9K
first seen 2021–2025 (52.1%)
2021
median year (half its files since)
Attribution status
This extension is attributed to Cap'n Proto as primary by 2 authoritative claims.
Claimants (2)
Languages that list
.capnp among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| Cap'n Proto | linguist | primary |
| Cap'n Proto | pygments | primary |
Wikidata says… (1)
File formats, image formats, audio codecs and other non-PL
entities that claim
.capnp on Wikidata
(property P1195) or in the Wikipedia infobox.
Source: data/derived/external_extension_index.csv.
Click Use as new PL on any row to open the
Add-PL form pre-filled with that entry's name, Wikipedia/Wikidata
URL, and this extension — one submission creates the PL + claim.
| Format | Class (Wikidata P31) | Suggested label | MIME | Notes | Action |
|---|---|---|---|---|---|
| Cap'n Proto schema Q105850009 schema language | file format; interface description language | — | text/plain | — | Use as new PL ↗ |
SWH-mined examples (0)
No archived examples for .capnp in our local mirror yet.