Avenpa
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Avenpa ToolCalculators and converters

Independent software studio

Useful software, for the small jobs.

Avenpa makes practical tools for the small jobs that deserve a clear answer, and keeps each one fast, plain and finished.

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Products

Software from the studio. Three products, so far.

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Avenpa Tool, with refund calculators, payroll tools and an assistant.
01 Avenpa Tool Small tools that finish one job. Live 02 Avenpa Business Refund calculators for your own website. Live 03 Bizdesk Quote to payment in one workspace. Live
04 More in the workshop New products are being built. They get a page here when they are live, not when they are announced. Soon

Inside Avenpa Tool

Four kinds of small job. Each one finished in a tab.

Refunds and cancellations

16 tools. Cancellation fees and refunds worked out from the published consumer-dispute standards, each with a reference letter (naeyong-jeungmyeong) to send. 16 tools.

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Contracts, work and pay

8 tools. Brokerage fees, late interest, lease renewals, payslips, severance and the 3.3% freelancer tax, dated by year and covered by tests.

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Dates and everyday numbers

3 tools. Day counts, time sums, ratios and unit conversion. The arithmetic you would otherwise do twice.

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For developers and designers

6 tools. Cron, JWT, subnets and timestamps in Korean time, plus WCAG contrast and CSS unit conversion.

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33

Tools live on tool.avenpa.com

4

Kinds of small job

0

Sign-ups needed to open a tool

0

Analytics scripts on this site

Company

A small studio, on purpose. The person who builds a tool stays to explain it, test it honestly and make it better.

About Avenpa

Research

Notes from the workshop

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PayrollNote 01

Rules that change every January

Rates that move on dates we do not control, kept in one dated module so the calculators cannot disagree with each other.

TestingNote 02

A calculator that is quietly wrong is worse than none

Money pages assert the thresholds and the rounding, and read the rates out of the source instead of carrying a second copy of them.

SessionsNote 03

One login for every Avenpa site

Sign-in moved out of each site and into a single login service, so a database behind a tunnel can no longer take a page down.

How we build

Small tools, held to a high bar.

How it's tested

Build

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01

Fast by default

Every page is prerendered and served from the edge. There is no spinner between you and the answer.

02

Nothing to sign up for

Tools open for anyone with the link. An account exists only if you want to save something you made.

03

Numbers carry tests

Rates and thresholds are asserted in the test run, and each page says which year they apply to.

Have a job that needs a tool?

Tell us what you would want it to do. A person at the studio will get back to you.

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