New · Kernel Split

Split bills and trips with friends.

The free Splitwise alternative: no sign-up, no daily limits and no ads.

  • Every kind of split, even by item
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Start splittingHow it works
One workspace, many directions

Tools for the work
you do next.

Kernel brings practical utilities, developer tools, document workflows, and small experiments into one calm home.

Available

PDF workspace

Merge, convert, edit, protect, sign, and compare documents in your browser.

Open PDF tools
v1.226.0 · Tools for work and play

One home for
what’s next.

Work across documents, code, data, and ideas without collecting a different tool for every task. Start with the product that matches the job in front of you.

Explore the workflow

Chrome 88+ · Manifest V3 · Free · No account required

01INSPECTSee every request.Network · Console · DOM02UNDERSTANDConnect the details.Storage · Security · TLS03BUILDMake the next move.Mock API · API Tester
</> Kernel Extension — Console
❯ network inspect github.com
✓ POST /api/user 200 42ms
✓ GET /cdn/app.js 304 12ms
0 trackers detected
 
❯ cert inspect github.com
✓ TLS 1.3 · Grade A · 180 days remaining
✓ HSTS enforced · CSP present
 
❯ mock add /api/user
✓ Rule active · contains /api/user → 200
# 30+ tools. One extension.
Kernel Extension — attached0.0 KB transmitted
tools30+
trackers0
manifestMV3
accountnone
A clearer way to work

From “why?”
to “there it is.”

Stay curious. Stay in context. Follow your next breakthrough.

01
Follow the signal

Inspect.

Start with what the browser sees. Explore requests, console messages, and the live DOM without leaving your page.

02
Find the missing piece

Understand.

Connect the details. Read response headers, inspect storage, and check certificates to understand what is really happening.

03
Make your next move

Build.

Turn insight into action. Mock an API response, test a request, and keep iterating right where you work.

Discover all 30+ tools
Features
Every tool you need.
Nothing you don't.

All tools live inside your existing DevTools panel — no new windows, no context switching. Grouped the way you'd already read a box model: the thing itself, out to your own workspace.

18 matching tools

Content · Live

Console

Capture every log, warning and error with timestamps. Evaluate JavaScript against the live page.

Get the extension Available inside Kernel DevTools. The illustration is a guide, not a live inspection.
Privacy
Zero tracking.
Zero compromise.

Kernel Extension collects no telemetry, sends no analytics, and stores mock rules locally in chrome.storage.local. Everything else is read-only from the inspected tab.

No telemetry
No analytics
No cloud sync
Local-only storage
Read-only page access
Install
One click.
Any browser.

Live on Chrome, Edge, and Firefox — install directly from the official store, no developer mode required.

🌐Chrome InstallationChrome 88+ · Manifest V3
Step 01
Open the store

Use Install on Chrome to open the installation options.

Step 02
Add the extension

Follow the official store prompts to add Kernel DevTools to your browser.

Step 03
Open DevTools

Open browser DevTools and select the Kernel DevTools panel.

Free · No account · Chrome 88+ · Manifest V3

Prefer working in your editor? The API Tester is also available as a standalone VS Code extension.