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About
Avenpa Tool offers free Korean refund, pay and severance, tax, loan and everyday calculators, photo and QR tools, and an AI assistant you ask in plain words.
What this is
Work out what you should get back when you cancel a gym, academy, travel, lodging, moving, rental, car rental or show contract early, and copy a reference letter. There are also calculators for pay, severance and social insurance, freelancer tax, loan repayment, and dates and times. The calculators follow Korean rules, and many of their screens are in Korean.
The calculators need no sign-up and no app. Signing in (with a Google account) is only needed for "My space", which keeps contracts, AI memory and your own tools in your account.
How results are calculated
Calculators use the numbers written in the Fair Trade Commission's consumer dispute resolution standards and in the original laws and notices. Each tool page lists the standard it used, the formula and what it leaves out.
Results and letters are for reference only and are not legal or tax advice. For a serious dispute, contact the Korea Consumer Agency (1372) or a professional.
How the AI answers
Text from the AI assistant and AI tools is written by Google's open Gemma 4 model, running on Cloudflare Workers AI. Drawing, transcription and read-aloud use other open models on the same platform.
When an existing calculator fits, the AI only picks the input values from what you said and the calculator's own code does the maths. The values it picked are shown under "Inputs I used" so you can check them.
Questions about laws and rules are answered from the current text on the National Law Information Center (law.go.kr) and web search results. The answer lists the sources it read, with links and the date checked. Web results can include blogs and news, so check the law itself for anything important.
Formulas in tools the AI builds and the AI's answers can be wrong. If a calculator does the same job, trust the calculator's result.
Checks and updates
Every tool that calculates money (refunds, pay, tax, interest) has automated tests, so a change that alters a result is caught.
When a rate or rule changes or a calculation is fixed, it is logged with a date on the updates page. If you think a result is wrong, tell us. Confirmed fixes are logged too.
Who runs this site
Avenpa Tool is run by an individual (not a registered business). Running costs are covered by advertising; there is no payment and no paid plan.
Send questions, bug reports and account deletion requests to contact@avenpa.com.