Privacy Policy
Last updated: 29 July 2026
Lab-Tacular does not collect personal information.
This is a static website that runs in your browser, not a server-side application. There is no account system, no database, and no login.
Where does your input go?
Nowhere.
Measurements, sequences and quality control data entered into the calculators are processed entirely within your browser. Nothing is transmitted to a server, nothing is stored, and nothing is shared with third parties. Close the page and it is gone.
What is stored in your browser
Some tools use your browser's local storage for convenience.
| Tool | What it stores | Where |
|---|---|---|
| Levey-Jennings chart | Control material details (test name, level, unit, lot number), cumulative summary values (count, sum, sum of squares), per-period summary history (period label, mean, standard deviation, coefficient of variation, time added) | Your browser |
| Levey-Jennings chart — rule settings | Which Westgard rules you have switched on, whether 1-2s counts as a warning or a rejection, the name of the preset in use | Your browser |
The individual measurements themselves are not stored. Everything listed above is either a summary statistic or control material information you typed in yourself.
These values stay on your device and are never transmitted. They are not visible on other devices. Clearing site data in your browser settings removes them, and each tool also offers a way to delete them directly.
The sequence analysis tools keep your session in browser memory only; refreshing the page clears it.
Cookies
One cookie (NEXT_LOCALE) records your language preference — Korean or English. It contains no identifying information.
Access logs
This site is served through Cloudflare. As part of delivering a website over the internet, access records (IP address, request time, browser type) may be retained by Cloudflare. This is a technical record common to all websites; the operator of this site does not identify or track individual visitors.
Cloudflare's handling of such data is governed by their own policy.
Analytics
This site does not currently use any visitor analytics.
Sharing with third parties
No personal information is collected, so none is shared.
Children's privacy
No personal information is collected from anyone, regardless of age.
Planned changes
Advertising may be added to this site in future. If it is, the advertising provider may use cookies to collect information. This policy will be updated and the "last updated" date changed at that time.
The principle that calculator input is never sent to a server will not change.
Questions
Please direct questions about this policy to: