// when all you want is speed.
px0 is a fast, ultra-light, remote-first, read-only IDE designed for instant code navigation and review in your browser. It starts in under 1 ms, idles at ~20 MB, and fuzzy-finds across the Linux kernel's 95,710 files in 6 ms.
When you just need to inspect, navigate, and audit code without booting an editor, waiting on heavy background indexers, or burning gigabytes of RAM.
Trace symbol references, inspect live git diffs against HEAD, review generated code, and close the tab without leaving your terminal flow.
$ claude code "refactor auth middleware" ✓ 8 files changed · 32 tests passing $ px0 . → browser opens instantly at http://localhost:6789
Spin up on any remote server, VM, or CI runner and browse the codebase instantly from your local browser: no SSH keys, no port forwarding hassle, and no heavy remote desktop daemons.
runner@ci-box:~/repo$ px0 -host 0.0.0.0 px0 v0.1.4 · listening on http://10.0.4.12:6789 local-laptop:~$ open http://dev-runner:6789 ✓ connected directly from local browser
Read through massive, 50,000+ file codebases on a laptop without background indexers hogging RAM or spinning up fans.
$ px0 ~/src/linux indexed 95,710 files in 370 ms · RSS 20.4 MB $ # fuzzy search in 6 ms · CPU < 1% ✓ smooth scrolling across million-line trees
Keep lightweight editors (like Vim, Neovim, or Helix) in the terminal for typing, while using px0 as a high-density, rich graphical inspection and diff console.
tmux pane 1: nvim main.go (fast keyboard editing) tmux pane 2: px0 . (starts in <1 ms) browser: side-by-side git diffs, Markdown & symbols ✓ best of both worlds: modal editing + GUI clarity
Every number here comes from ./benchmark.sh against shallow clones of seven real repositories. Linux, language servers off, fastest of five requests. Run it on your machine and paste the table anywhere.
| repo | lang | source | files | index | fuzzy | full scan | open big | reopen | rss | peak |
|---|---|---|---|---|---|---|---|---|---|---|
| flask | Python | 3 MB | 235 | 1 ms | 0.8 ms | 2.3 ms | n/a | n/a | 16 MB | 18 MB |
| redis | C | 26 MB | 1,855 | 13 ms | 1.0 ms | 18.2 ms | 80.8 ms | 1.2 ms | 17 MB | 27 MB |
| django | Python | 74 MB | 7,014 | 39 ms | 1.3 ms | 26.8 ms | 166.8 ms | 1.0 ms | 20 MB | 29 MB |
| react | JavaScript | 63 MB | 7,178 | 52 ms | 2.7 ms | 32.2 ms | 57.7 ms | 0.7 ms | 21 MB | 28 MB |
| kubernetes | Go | 370 MB | 25,926 | 150 ms | 13.5 ms | 84.6 ms | 199.0 ms | 0.9 ms | 30 MB | 44 MB |
| typescript | TypeScript | 414 MB | 66,533 | 566 ms | 6.2 ms | 150.3 ms | 40.9 ms | 6.5 ms | 69 MB | 105 MB |
| linux | C | 1,809 MB | 95,710 | 370 ms | 6.0 ms | 451.8 ms | 26.7 ms | 0.6 ms | 55 MB | 73 MB |
px0 reclaims memory after 15 s of inactivity, so an open session settles back down.
Servers are separate processes, spawned on the first request for their language and shut down on exit. Without one, px0 falls back to a regex outline instantly.
$ ./benchmark.sh --clone && ./benchmark.shmethodology → BENCHMARKS.mdThe navigation you reach for a hundred times a day, done in milliseconds, in a UI that renders only the lines you can see.
Files, symbols, and a full-tree regex scan behind three chords. Ranking favours basenames, word boundaries, and camelCase humps, the way fzf feels.
Working-tree status badges (M, A, D, U) in the file tree, dirty ancestor paths, and a changed-only filter. Toggle side-by-side or unified diffs vs HEAD with Ctrl+D.
Full GitHub Flavored Markdown and footnotes rendered via goldmark with Chroma-highlighted code fences. Switch preview and source with Alt+M while locking scroll position.
Windowed tokenizing with Chroma...
func FuzzyFind()Opening a 400,000-line file costs the same as a 10-line one. Only the visible window plus 24 rows of overscan is mounted; scrolling recycles rows with a single transform.
Native tokenizing through Chroma. The server lexes a 1,000-line window padded with 400 lines of context, never the whole file, and caches rendered HTML under a 512 MB LRU budget.
Zero-config detection of servers on your $PATH. Spawned lazily on first request, stopped on exit. Missing or crashed? Instant regex outline instead.
Tokyo Night by default, plus Paper, Catppuccin, Dracula, GitHub Dark, Gruvbox, Monokai, Nord, One Dark, Rose Pine, and Solarized. A theme is one CSS file of tokens.
HTML, CSS, and JS are embedded with go:embed. No Electron, no Node, no CGO, no system libraries. Copy it to a box and run it.
px0 static, go:embed ├─ index · search · highlight · lsp ├─ web/ html css js, ~74 KB └─ themes/ 14 × css
After 15 seconds without requests, px0 reclaims memory. A tab left open for the afternoon costs what an idle one should.
Spin up on any remote server, cloud instance, or runner in under a millisecond. Inspect and search remote codebases directly in your local browser without configuring SSH keys, forwarding ports through flaky sessions, or installing heavy remote desktop suites.
$ px0 -host 0.0.0.0 -port 7777 ~/work/repo$ px0 -no-open -port 8080 /workspace$ docker run -p 7777:7777 -v $(pwd):/src px0:latestRemote code editors install gigabytes of node runtimes and background server processes on the remote machine. px0 runs as a single lightweight binary, serving directly over HTTP without requiring you to maintain SSH shell sessions.
Pass -host 0.0.0.0 or -port 7777 to bind the web console. Access from any browser on your laptop, iPad, or phone across your private VPN, Tailscale mesh, or Cloudflare Tunnel with pooled gzip compression.
Every request is strictly read-only with no write endpoints. safePath rejects directory traversal attempts, host header checks protect against DNS rebinding, and external stdlib jumps require explicit LSP allowlisting.
When AI agents and orchestrators write code, your workflow shifts from typing to verification. px0 tracks git status, bubbles changes through directories, and renders side-by-side split or unified diffs in milliseconds.
When a deeply nested file changes, every parent directory in the path receives a dirty marker dot. You never miss changes hiding inside collapsed folders.
Press Ctrl+D on any file to inspect the diff against HEAD. Additions and deletions render with line gutters and syntax highlighting intact.
One click filters the entire tree down to only touched paths. Audit an AI agent refactor or local test run without scrolling through clean directories.
Code now arrives from the terminal, not the keyboard. What is left for you is review, audit, and navigation, and that job needs one thing done exceptionally well: a zero-latency, distraction-free place to read, explore, and verify. Not an editor that takes seconds to boot and gigabytes to idle.
drives generation
Agents, harnesses, and orchestrators write the code, run the tests, and move the workflow along.
agent 14 files changed ✓ 212 tests passed
drive verification
Follow symbol references, inspect git diffs, preview rendered docs, and check the architecture.
Ctrl D diff vs HEAD Alt M preview F12 definition Shift F12 refs
is overkill
Booting an Electron suite with an extension host and a gigabyte-plus heap just to read agent output.
1,440 MB rss, 15+ processes 4 - 10 s to index the workspace
| dimension | traditional IDE | px0 |
|---|---|---|
| built for | typing code character by character, hosting plugins | reading, exploring, diffing, and verifying code |
| base memory (rss) | ~1,440 MB | ~20 MB70x lighter |
| startup cpu spike | 35% - 50% | < 1% |
| cold start | several seconds | sub-millisecond |
| process tree | 15+ Node.js / Electron processes | 1 static Go binary |
| workspace indexing | multi-second background churn | 13 ms for redis, 370 ms for the linux kernel |
| setup | config files, plugins, node, npm | zero config, zero runtime |
The chords you already know from your editor, plus one palette that switches mode on its first character. Press ? inside px0 for the full sheet.
lspsrv→ lspservers.go>diff→ Toggle Git Diff@score→ fuzzyScore:120→ go to line 120A Go server that owns indexing, search, highlighting, and language servers, talking JSON to a zero-dependency ES module frontend. The speed comes from a pile of small, boring decisions.
Pass one proves every query rune is present. Pass two walks back from the last hit to pull matches as tight as possible. The same ranking feel as a dynamic program, in a linear scan. ARCHITECTURE.md →