39 tools 100% client-side Open source
A canopy of tools for the ops you actually do.
Validators, converters, testers and linters for DevOps and SRE engineers — subnet and CIDR math, cron, PromQL and LogQL, JWT and Kubernetes sizing. No sign-up, and nothing you paste leaves your device.
- Network
- 10.20.0.0
- Broadcast
- 10.20.3.255
- Netmask
- 255.255.252.0
- Wildcard
- 0.0.3.255
- Usable range
- 10.20.0.1 – 10.20.3.254
- Usable hosts
- 1,022
- Class
- Private (RFC 1918)
/22 → 1,022 usable hosts
Jump back in
Tools in the canopy.
Focused, single-purpose utilities for platform and DevOps engineers — every one live, free and running entirely in your browser.
From developer to DevOps engineer in 90 days.
A free, guided path — one focused lesson a day, and a story-driven mission you play right in your browser terminal to fix a broken system at the end of every week. All 90 days and 10 missions are live now — no signup.
- 90
- days
- 5
- phases
- 10
- browser missions
- ~80
- hours core
student@prod-web-01:~$ ps aux --sort=-%cpu | head -3USER PID %CPU COMMANDroot 4521 94.0 /opt/scripts/nightly-backup.shstudent@prod-web-01:~$ kill 4521student@prod-web-01:~$ systemctl restart nginxstudent@prod-web-01:~$ curl -sI localhost | head -1HTTP/1.1 200 OK# 02:07 — the site is back. You did that.Free roadmaps & hands-on guides.
Go from the fundamentals to job-ready with staged career roadmaps and deep, practical guides — Linux, Docker, Kubernetes, AWS and networking. Free, no signup, and you can practise with the tools as you go.
- PRICE Free forever Every tool, no paywall, no trial.
- RUNTIME Runs in your browser Pure client-side. Nothing to install.
- PRIVACY Your data stays local Inputs never leave the device. Open code — audit it.
- ACCESS No signup Open the page and start working.
One toolbox, not twenty tabs.
Every tool shares the same privacy guarantees, the same fast static pages, and one search box across all of it — so switching tasks doesn’t mean switching trust levels.
Everything in one tab.
Bookmark one site instead of a dozen. When you need a converter, validator, or calculator, it's already here — same look, same shortcuts, no re-learning.
Instant, every time.
Every tool is static and client-side, so there are no server queues or cold starts to wait on — pages load instantly, whether you or ten thousand people hit them at once.
Privacy is a feature.
Your rules, configs and logs are yours. Nothing is uploaded, logged or phoned home — the whole point of running it in your tab.
Privacy
Nothing you paste leaves your tab.
Every OpsCanopy tool runs as static JavaScript in your browser. There is no backend to receive your rules, configs or logs — no uploads, no telemetry on your inputs, no account to create. Close the tab and it’s gone.
- this page
- 1 request
- your input
- 0 bytes sent
- uploads
- 0
- cookies
- 0
- accounts
- 0
Notes from the incidents.
Short, practical write-ups on the problems these tools exist to solve — why a pipeline went red, where an alert vanished, what a query actually means.
- Learn DevOps in 90 Days: the free, incident-first path from developer to DevOps engineerWhy we built Mission: 90 Days DevOps — a free day-by-day path from Linux to Kubernetes with playable incident missions. The full plan, the design decisions, and the honest tradeoffs.
- Why Isnt My Alert Reaching the Right Receiver? Debugging Alertmanager RoutingAlerts going to the wrong receiver, or no receiver at all? Debug Alertmanager routing — first-match-wins, missing continue, matcher regex and catch-all defaults.
- How Alertmanager Routing Works: Matchers, continue, and the Route TreeA clear mental model for Alertmanager routing — the route tree, matchers, the continue flag, grouping and receiver inheritance — so you know exactly where an alert goes.
FAQ
Questions, answered.
Tap a question to expand the answer.
Are OpsCanopy tools really free?
Yes. Every tool is completely free with no paywalls, usage limits, or premium tiers. There is no account requirement of any kind — open a tool in your browser and start using it immediately.
Do I need to sign up to use these online DevOps tools?
No. There is no signup, login, or email capture. Open any tool in your browser tab and use it immediately — no account, no cookie banner, no friction. Analytics runs cookieless unless you opt in on the privacy page.
Is my data uploaded to a server when I use the tools?
No. Every tool runs 100% client-side in your browser tab; nothing you paste is logged, stored, or uploaded. Your data never leaves the browser.
Is it safe to paste a JWT or config into a browser-based tool?
On OpsCanopy, yes. Decoding and parsing happen entirely in local JavaScript — nothing you paste is ever transmitted, which you can verify in the browser network tab (the only outbound traffic is anonymous, cookieless page analytics, disclosed in our privacy policy). As general hygiene, never share signing secrets with any third party, but OpsCanopy uploads none of your input.
Do the tools work offline?
Once a tool page has loaded, it keeps working even if you disconnect from the internet, because all processing is local and there is no backend to call. Going offline is also an easy way to verify the client-side privacy claim yourself.
Who are these browser-based DevOps tools for?
DevOps engineers, SREs, sysadmins, platform and backend engineers — anyone who needs quick subnet and CIDR math, cron schedules, PromQL or LogQL queries, JWT, Base64 and hash utilities, timestamp conversion, GitHub Actions validation, or Kubernetes resource sizing without installing anything.
Why use these instead of asking ChatGPT or Claude?
Use both — for different jobs. An AI assistant is excellent at explaining concepts and drafting configs, but it generates plausible text rather than computing answers, and exact arithmetic is a documented weak spot: subnet boundaries, cron schedules, epoch conversions and regex behaviour routinely come back looking right and being wrong. OpsCanopy tools compute answers deterministically — real parsers, exact math — and recompute instantly as you tweak the input, with no re-prompting, no token cost and no rate limits; once a tool page has loaded, it keeps working offline. Nothing you paste is ever transmitted, so logs, tokens and configs stay on your machine. Several tools even make handy AI checkers: run the same subnet, cron expression or timestamp through them and you get the ground truth to compare against.
How is OpsCanopy different from other online developer tool collections?
Most tool collections focus on generic formatters. OpsCanopy specialises in DevOps and SRE workflows — CIDR planning, cron, PromQL and LogQL, Kubernetes capacity, CI validators — with the same guarantees throughout: free, no signup, 100% client-side, nothing uploaded or logged.
I want to become a DevOps engineer — where do I start?
Start with OpsCanopy Learn at /learn. It pairs a staged DevOps career roadmap (/learn/roadmaps/devops) with free, hands-on guides covering Linux, Docker, Kubernetes, AWS and networking — going from the fundamentals to job-ready. As you read, you can practise immediately with the matching tools in the catalog, no signup required.
Verify the AI → — recompute a ChatGPT or Claude answer exactly, locally.
Find your tool. Skip the install.
Free, private and instant. Open the catalog and put the right utility to work in your next deploy.