Sonar
A tiny CLI to see and kill whatever's running on localhost
Details
- External ID
- 47452515
- Source
- HN
- Company
- —
- Product
- Sonar
- Website domain
- github.com
- Launched
- March 20, 2026
- Cohort
- —
- Upvotes
- 204
- Upvotes percentile
- 0.964329643296433
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:26 p.m.
- Updated at
- Sept. 7, 2026, 9:26 p.m.
Enrichment
- Theme
- systems tools and desktop utilities
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Commercial product
- Normalized one-liner
- cli tool to view and kill localhost processes
- Manually corrected
- False
Could you build this?
Yes It is a straightforward CLI utility that queries OS network sockets/processes (e.g., using lsof or netstat commands) and terminates matching PIDs.
Discussion
20 comments analyzed.
Competitors mentioned: ctop (for docker containers), lsof, portless (named localhost URLs), pk (shell function to kill port listeners)
Concerns raised: Process group management in Unix is problematic - child processes don't get killed with parent by default, TUI programs in raw mode often have ctrl+c handlers that only kill the parent, leaving children alive, Hard-coded port numbers cause collisions across multiple localhost apps, Windows didn't support Unix Domain Sockets for 26 years
Feature requests: Support Unix Domain Sockets (AF_UNIX) as alternative to port-based approaches, Named localhost URL mapping instead of hard-to-remember port numbers, Better child process lifecycle management and killing
Competitors
Other products that read as similar to this one — 511 launches clear the similarity bar, closest 8 shown.
Attention rank: #24 of 512 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 140 days after the earliest competitor.
- HomeButler · hn · 2026-06-04 · 5 upvotes · similarity 0.50
- osu-echo · github · 2026-09-16 · 10 upvotes · similarity 0.48
- Deflect One · hn · 2026-04-14 · 8 upvotes · similarity 0.48
- Portview, A diagnostic-first port viewer for Linux (~930 KB, zero deps) · hn · 2026-02-08 · 5 upvotes · similarity 0.48
- audio-cleaner-cli · github · 2026-09-17 · 12 upvotes · similarity 0.48
- audio-cleaner-cli · github · 2026-09-20 · 12 upvotes · similarity 0.48
- A Mutating Webhook to automatically strip PII from K8s logs · hn · 2026-05-05 · 25 upvotes · similarity 0.48
- nsl · github · 2026-09-26 · 65 upvotes · similarity 0.47
Other launches for this product
- No other launches for this product.
Same idea, different domain
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