About kr-utils main

kr-utils main (krutils.com/main/) is a free site of small calculators and guides for foreigners living, working, or visiting Korea. There is no sign-up, no app to install, and your inputs stay on your device. This page covers our mission, data sources, update cadence, limits of liability, and how to reach us.

1. Who we are

kr-utils main runs on the krutils.com domain alongside utilkit, the Korean-language sibling site for Korean residents. Both are operated by the same individual based in South Korea.

Because there is no registered business entity, no business registration number is shown. This is a one-person side project funded by ads, operated alongside a full-time job.

2. What we build

kr-utils main collects the small frictions that foreigners typically hit when living or working in Korea, and turns each one into a fast browser tool. The site currently has 23 tools and 7 guides. Categories include:

Topics that don't fit a single calculator — multi-year tax filing, visa renewal flow, comparing carriers — live as long-form guides.

3. Why we make this

Life in Korea as a foreigner involves an unusual number of small calculations: how many days until your ARC expires, what your salary actually looks like after the 19% flat tax option, how Seoul's transfer fare works on T-money, whether you qualify for the F-1-D digital nomad visa. The answers exist somewhere, but they're scattered across government PDFs, expat forums, and outdated blog posts.

kr-utils main puts the most-asked calculations into one place that loads fast on a phone and gives a clear answer in a second. No account, no install, no chasing pop-ups. Each result can be shared as a link or screenshot — useful for sending to a friend, your HR team, or your immigration lawyer.

4. Data sources and verification

Tool logic and content are grounded in primary Korean government sources:

New tools are verified against brute-force test ranges, boundary values, and public reference cases before launch. When a law or rate changes, the change is reflected immediately. Each tool's page shows the effective basis date next to the H1 or in the body so you can tell which version of the rules the answer reflects.

5. Update policy

Long-form guides are reviewed each quarter and the "Last updated" date at the top of each guide is bumped when content changes.

6. Limits of liability

All tools and guides on kr-utils main are for informational purposes and fast estimation only. They are not legal, tax, medical, or immigration advice. For any of the following, please consult the appropriate professional or official authority:

Tool results may differ depending on date, statute interpretation, and personal circumstances. Each tool page also carries its own disclaimer at the bottom — please read both.

7. Contact

Use one address for everything: bug reports, data update requests, new tool ideas, business inquiries, and privacy questions.

※ The same information in Korean for the utilkit side: About — utilkit.