Effective date: 22 October 2026
calctool.cc (Dimensionless Number Calculator, “the site”) is a personal project run by one individual. This policy explains what information is processed when you use the site, by whom and for what purpose, and what choices you have.
1. What the site does not do, and your calculator inputs
- The site has no registration, sign-in or contact form, and does not ask for your name or email address.
- Numbers you enter in a calculator are computed by JavaScript in your browser. The operator runs no server that receives or stores them.
- However, the analytics, advertising and hosting/security services listed in section 2 are installed on the site and collect information from your browser automatically. In particular, on pages where Microsoft Clarity is installed, page layout and actions such as clicks and typing may be recorded for session replay.
- Your theme (light or dark) and language choice are stored in your browser’s localStorage as theme and lang. They are not sent to the operator and are removed when you clear the site’s data in your browser.
2. Information processed, purposes and pages
| Service (provider) | Purpose | Information | Pages |
|---|---|---|---|
| Google Analytics 4 (Google) | Usage statistics such as visits, popular pages and referrers | Page views, device and browser information, cookie identifiers, on-page interactions | All pages |
| Google AdSense (Google and third-party ad vendors) | Serving ads, personalised advertising, measuring ad performance | Advertising cookie identifiers, visits to this and other sites, device and browser information | All pages except the 404 error page |
| Microsoft Clarity (Microsoft) | Usability analytics (heatmaps, session replay) | Clicks, scrolling, mouse movement and other interactions, page structure (DOM) and changes, cookie identifiers, device and browser information | Home (/), Korean privacy policy (/privacy), Korean terms (/terms) |
| Cloudflare (Cloudflare, Inc.) | Hosting and delivery (CDN), traffic routing, security such as blocking malicious traffic | IP address, requested URL and time, browser information and other connection and traffic data | All pages |
If you post on GitHub Issues, your GitHub username and post are public, and the operator uses them to reply and fix errors. That information is stored on GitHub’s service.
3. Advertising and cookies
- Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this website or other websites.
- Google’s use of advertising cookies enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the Internet.
- You may opt out of personalised advertising by visiting Google Ads Settings. Opting out does not remove ads; non-personalised ads may still appear.
- Ads from third-party vendors other than Google may appear. You can opt out of some vendors’ personalised-advertising cookies at aboutads.info; users in Europe can also use Your Online Choices.
- How Google uses information from sites that use its services is described at How Google uses information from sites or apps that use our services.
4. Microsoft Clarity
The site uses Microsoft Clarity on the pages listed in section 2 to understand how the site is used and to improve usability. Clarity uses cookies and similar technologies to collect behavioural data such as clicks and scrolling and page information, and provides heatmaps and session replay. Third parties such as Microsoft may collect visitor information in this process, and Microsoft may collect or receive personal information to provide Microsoft Advertising. See the Microsoft Privacy Statement and Clarity cookie documentation.
5. Cloudflare
The site is hosted on Cloudflare Pages, and every request passes through Cloudflare, which processes IP addresses and traffic data. When the site’s responses were checked on 22 October 2026, Cloudflare set no cookies (no Set-Cookie header). Security features such as bot checks may still use Cloudflare security cookies when triggered. See the Cloudflare Privacy Policy and Cloudflare cookie documentation.
6. Retention and deletion
The operator keeps no server or database of visitor information, so there is no visitor data held by the operator to delete. Information collected by each service is kept and deleted by that company for the periods below.
| Service | Retention | Reference |
|---|---|---|
| Google Analytics 4 | User-level and event-level data associated with cookies, user identifiers or advertising identifiers is kept for 2 months under the product default described by Google. In a standard property the administrator can choose 2 or 14 months, so the value applied to this site may differ from the default. A setting also exists that restarts the retention period of a user identifier on new activity. The retention setting does not apply to standard aggregated reports. | Google Analytics data retention, Get started with Explorations (default retention) |
| Google AdSense | Kept and deleted under the Google Privacy Policy and Google’s data retention description. The operator does not set the retention of advertising data. | How Google retains data |
| Microsoft Clarity | Session playback (recording) data is kept for 30 days. Click data and per-page aggregated data, heatmaps, and labelled or favourited sessions are kept for 9 months. Microsoft states that after 30 days it keeps 1% of recordings or 10 recordings per day, whichever is higher, for up to 9 months. After the retention period, data on Clarity servers, including backups, is deleted. | Clarity Data Retention, Clarity Recordings overview |
| Cloudflare | Connection and traffic data is kept and deleted under the Cloudflare Privacy Policy. The operator does not download or keep Cloudflare logs. | Cloudflare Privacy Policy |
These periods were checked in each company’s official documentation on 22 October 2026. If a company changes its defaults or policy, its own documentation prevails.
Authors can edit or delete their own GitHub Issues posts; on request, the operator hides or deletes posts that contain personal information.
7. Third parties and international transfers
The operator does not compile visitor information to sell or hand over to anyone. The services in section 2, however, collect information directly from your browser through code installed on the site, and each company processes it under its own terms and privacy policy. The Microsoft Clarity terms treat the operator and Microsoft as independent controllers of personal data.
These companies process information outside Korea. Article 28-8 of Korea’s Personal Information Protection Act treats provision (including access), outsourced processing and storage of personal information abroad as an international transfer, and paragraph 2 of that article lists what data subjects must be told: the items transferred; the destination countries, timing and method; the recipient’s name and contact details; the recipient’s purpose and retention period; and how to refuse the transfer, the procedure and its effect. The site discloses these items in the table below.
On the legal basis, these are the facts the operator has established. The site has no sign-up, so it does not enter into a separate service contract with visitors, and it does not currently show a screen that collects separate consent to international transfer. Korea’s Personal Information Protection Commission explains that direct collection of a Korean data subject’s personal information by an overseas business is not an international transfer under the Act (PIPC explanation, in Korean). Whether each service counts as such direct collection or as processing outsourced by the operator depends on that company’s terms and processing, so the table lists everything visitors need to know in either case. The statutory text is available at the Korean Law Information Center (Article 28-8).
| Recipient and contact | Countries | Items | Purpose | Timing and method | Retention |
|---|---|---|---|---|---|
| Google LLC, Google privacy inquiry form | The United States and other countries where Google runs servers (Google states that it may process information on servers in many countries) | Google Analytics 4 and AdSense items in section 2 (page views, device and browser information, cookie and advertising identifiers, interaction data) | Usage statistics, ad serving and measurement | Sent by your browser to Google servers over the internet each time you open a page | Google Analytics 4 and AdSense periods in section 6 |
| Microsoft Corporation, Microsoft privacy support and requests | The United States and other jurisdictions where Microsoft, its affiliates or service providers have facilities (Clarity data is stored in the Microsoft Azure cloud) | Clarity items in section 2 (clicks, scrolling and other interactions, page structure, cookie identifiers, device and browser information) | Usability analytics, Microsoft Advertising | Sent by your browser to Microsoft servers over the internet when you open the home page, /privacy or /terms | Clarity periods in section 6 |
| Cloudflare, Inc., privacy questions: [email protected] | Primarily the United States and the European Economic Area (Cloudflare states that information may be accessed or transferred from other countries for its operations) | Connection and traffic data in section 2 (IP address, requested URL and time, browser information) | Hosting, delivery and security of the site | Each request passes through the Cloudflare network when you visit the site | Cloudflare period in section 6 |
How to refuse and what happens: information sent to Google Analytics 4, AdSense and Clarity can be blocked or reduced by the methods in section 8 (blocking cookies in the browser, Google ad settings, the Google Analytics opt-out add-on, or script blocking). The calculators and guides keep working, and ads may be shown in non-personalised form. Processing of connection data by Cloudflare is needed to deliver the site, so the only way to refuse it is not to visit the site. Questions about the procedure can be raised through GitHub Issues as described in section 10.
8. Cookies and similar technologies, and how to refuse them
A cookie is a small text file a website stores in your browser. On this site, the services in section 2 use cookies and similar technologies. Clarity’s documentation lists first-party cookies such as _clck and _clsk and third-party cookies such as CLID and MUID; whether they are actually set depends on the browser and environment.
- Browser settings: block or delete cookies, or use tracking-protection or script-blocking features so that analytics and ad scripts do not run, for example following Chrome’s cookie help. Blocking only third-party cookies may leave analytics based on first-party cookies running.
- Personalised advertising: Google Ads Settings, aboutads.info, Your Online Choices.
- Google Analytics: the Google Analytics Opt-out Browser Add-on. It applies only to Google Analytics, not to Clarity, AdSense or Cloudflare.
The site currently has no cookie-consent management screen, so use the browser settings and service settings above to make your choices.
9. Your rights
You (or a legal guardian for a child under 14) may request access to, correction, deletion or suspension of processing of personal information, and may withdraw consent. Because the operator holds no visitor data directly, rights over data collected by Google and Microsoft are most quickly exercised through their account settings and privacy tools. To make a request to the operator, open an issue on GitHub Issues stating only the type of request; the operator will explain the process in the issue and review it without delay. GitHub Issues is public, so do not include personal information in the issue.
10. Privacy officer and complaints
The site is run by one individual and has no separate privacy department. The site operator is responsible for privacy matters, and privacy questions and complaints are received through GitHub Issues.
11. Security measures
The site is served over HTTPS. The operator keeps no server or database of visitor information, so there is no operator-side store of visitor data that could leak.
12. Remedies for infringement
For advice, reports or dispute mediation about personal information infringement, you can contact the following Korean bodies.
- Personal Information Dispute Mediation Committee: phone 1833-6972, www.kopico.go.kr
- Personal Information Infringement Report Center (run by the Korea Internet & Security Agency): 118 (no area code), privacy.kisa.or.kr
- Public Prosecution Service, headquarters (공소청 본청): 1301 (no area code, charged call), www.spo.go.kr. This address was formerly the website of the Supreme Prosecutors’ Office; when checked on 22 October 2026 the website and the 1301 call centre were shown under the 공소청 name.
- Korean National Police Agency, Cyber Crime Report System: civil inquiries 182 (charged call), ecrm.police.go.kr. This is a civil inquiry line, separate from the emergency number 112.
13. Changes to this policy
This policy applies from 22 October 2026 and replaces the English policy published in January 2026. The 22 October 2026 version adds retention periods by service, international transfer details and remedies for infringement. Changes will be posted on this page with a new effective date, and earlier versions are available in the repository history. The Korean version at /privacy prevails if the two differ.