lab · by fin1te
Small tools for the things you can't paste into a SaaS product: production CronJobs, table definitions, event schemas. Each one is a static page that does its work in your browser, and the page isn't allowed to talk to any server once it has loaded.
Tools
Paste real config, get answers you'd otherwise work out on a whiteboard. More tools will land here as they earn their place.
cronmap
Paste Kubernetes CronJobs, crontabs, Airflow DAGs or GitHub Actions workflows. See a week of starts on your own clock, the minutes where dozens of jobs pile up, the runs daylight saving will skip or double, and a patch that spreads them out.
schema
Paste JSON records, JSON Schema, Avro, Protobuf, a Spark schema or a CREATE TABLE. Get the same shape in twelve formats, with a note wherever a target can't say what the source said, and a compatibility check between two versions.
nines
Turn an availability target into minutes of downtime per day, week, month and year, or work back from the downtime you had. Combine parts in series and redundant copies to see what the whole system can promise, and which part holds it back.
wrap
Pick a counter's width and what it counts. See how long until it rolls over to zero, and how many wraps can fit between two polls. More than one means the difference between samples can't be trusted.
sparkmem
Enter your Spark executor settings. See what the cluster is asked for, how the heap splits into reserved, execution, storage and user memory, how much sits outside the unified pool, and the cluster-wide totals.
Private by construction
Built for engineers at banks, telcos and government shops, where pasting production config into a web tool is a policy breach. The promise is enforced by the browser, not by a privacy page.
The site is static files on Cloudflare's CDN. No API, no backend, no database, no logs of what you type, because nothing you type is ever in a request.
Every page carries a Content Security Policy with connect-src 'none'. Fetch, XHR, WebSockets and beacons are blocked, even for a buggy or injected script. Scripts, styles and fonts load only from this site.
No tracking pixel, no consent banner, no fonts or scripts from anyone else's domain. The fonts are served from here.
It autosaves to this browser's local storage and to the part of the address after the #, compressed. Browsers never send that fragment to a server, so a copied link carries your input with nobody in between seeing it. Your own browser history keeps it too, so use a private window for anything that shouldn't sit there.
Open your browser's developer tools on the Network tab, paste something, and watch nothing happen. Or read the Content-Security-Policy header on any response.
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