About this site

What this site is for

A lot of the figures Japanese government bodies publish only ever appear as a PDF or a spreadsheet. Rice trading prices, for instance, are released monthly as a CSV file: to sort them by growing region and variety, or to compare them against last year, you have to open the file and rebuild the table yourself. The same is true of tax and social-insurance thresholds — you have to read the rules before you can tell which one your own income falls under.

This site exists to take numbers that are already public but awkward to compare and put them into a form you can read on the web. Alongside that it hosts small tools — a Base64 converter, a radius search over Japanese municipalities — for the kind of job you only need to do once, with no sign-up and nothing to install.

It started as a single page that did nothing but Base64 encoding and decoding. The rest grew out of calculations and tables that turned out to be needed. No page requires an account, a login or an app.

What is published here

There are three kinds of page, and the numbers on them are handled differently.

1. Tables built from official statistics

Published values, reproduced as they are, with sorting, filtering, unit conversion and year-on-year comparison added on top — nothing else. This covers gold, currency and fuel prices, and the rice price list (米の価格 銘柄別一覧, currently Japanese only). The figures themselves are untouched, and each page states its source, its unit, and the date the value refers to.

2. Calculators

Pages that work out a result from what you enter. The Japan income threshold simulator implements the statutory requirements as a set of conditions; the streamer revenue estimator works from public channel statistics and a fixed rate per thousand views. The latter is an estimate, not an actual payout, and the assumptions it uses are stated on the page.

3. Conversion and search tools

Pages that convert a value on the spot, or find the entries that match a condition. The Base64 converter turns text into Base64 and back. Municipalities within a radius takes your current location or a municipality as the center and lists every Japanese municipality inside a chosen distance. The reference points it uses come from open data, published as a static file; the source is in the table above. ID Photo Maker crops a photo you choose to a standard ID photo size, replaces the background and composites a suit. Finding the face, telling hair, skin and clothing apart and locating the shoulders all use trained models that run inside your browser, but your photo is never passed through a generative model. The suit that is composited is a photograph of a real garment, prepared in advance and shipped with the page, then fitted to your build. The photo itself never leaves the browser.

There is also the unofficial VSpo! relationship map, and a news roundup for the 2026 Kumamoto earthquake. The full index is on the tool list.

Sources and how often they update

Where the automatically collected data comes from, and how often it changes. The interval is set by the publisher, not by this site: fuel prices move once a week because the survey behind them is weekly.

Collection is automatic, so a failed run leaves a gap in the data, and a change to the publisher's file format stops the feed until it is fixed. Treat every figure here as a reference value, and check the original source before acting on it.

How it is built

• Calculation happens in your browser. Threshold checks, table lookups and Base64 conversion use no server processing at all, so they keep working on a page you already have open even if the connection drops.
• Only the Base64 converter records input. It logs the conversion direction and the plain-text side of the input. Because that is recorded, this site does not claim "nothing is sent" — please do not paste passwords or private keys. The details are in the privacy policy.
• Unofficial pages say so. The relationship map is an unofficial fan page with no connection to VSpo! or its operating company, and the revenue estimator has no connection to YouTube, Twitch or TwitCasting.
• Ad placement is fixed. Ads are not interleaved into the body text or placed where a tap is likely to be unintentional, and their height is reserved before they load so text does not jump.

Editorial policy and corrections

On any page carrying figures, three things are always stated in the body text: the source, the unit, and the date the value refers to. Units matter more than they look: the rice figure is a wholesale price per 60 kg of brown rice, which is a different thing from the 5 kg bag of milled rice on a supermarket shelf. Where a converted value is shown for reference, the basis of the conversion is shown with it.

Pages that describe statutory rules are reviewed when the rules change. For the Japanese income thresholds that means April 2026, October 2026, January 2027 and October 2027.

If you find something wrong or out of date, please get in touch and it will be checked and fixed. Removal requests go to the same address.

Who runs it, and how to get in touch

This site is built and run by one person, not a company. Running costs are covered by the advertising and affiliate links on the pages; what that involves is set out in the privacy policy.

For feedback, corrections or removal requests, write to rookies.fishers-6o@icloud.com. As it is a one-person site, a reply may take a while.

Disclaimers

• No guarantee is made as to accuracy or completeness; the original published source takes precedence.
• The price and statistics pages are informational and are not investment advice.
• Figures from the revenue estimator are approximations based on stated assumptions, not real earnings.
• No liability can be accepted for losses arising from use of this site.

Frequently asked questions

Are the figures on this site your own research?

No. Prices and statistics are published values taken as they are from sources such as Japan's Ministry of Agriculture, the Agency for Natural Resources and Energy, and the European Central Bank. What this site adds is the presentation: sorting, filtering, unit conversion and year-on-year comparison. Every page states its source and its unit in the body text.

What should I do if I find a mistake?

Email the address in the contact section. The source will be checked and the page corrected if it is wrong. Because a change in the publisher's file format can silently stop a data feed, it helps to say which page, which figure, and when you saw it.

Is anything I type sent to a server?

Calculation and conversion all happen inside your browser, so nothing needs to be sent for the tools to work. The one exception is the Base64 converter, which logs the conversion direction and the plain-text side of the input. This is described in the privacy policy.