About
A web studio with room to explore.
GreedMonster is a brand for useful and entertaining web services. Tools are one starting point, with room for web games, digital assets, shopping, and other experiences. This is the shared home for our published services, operating information, and news.
What we make
We started publishing services in August 2026. Today, Kurashi Tools helps with Japanese dates, ages, school years, and everyday calculations. Symbol Copy offers text transformations and copy-ready characters for profiles and names. These tools are our first services, not a limit on what the brand can make. Games, asset collections, shops, and entertainment are possible directions, not products we claim to have launched. We list services here once they are available. Each service keeps its own interface, instructions, and policies so they fit the people using it.
How input in our current tools is handled
Calculations and text transformations are performed in the browser. We do not need an account, a database of birthdays, or an uploaded copy of your text to provide those results. Optional saved preferences belong to the browser in which you saved them; they do not follow you to another device. This does not mean that a website makes no network requests. Hosting, aggregate analytics, and any advertising on an individual service have separate data practices, explained in that service’s privacy policy.
Sources and editorial decisions
For calendar rules and public information, we prefer the organisation responsible for publishing the source. Examples include Japan’s Cabinet Office for eras and public holidays, e-Gov for legislation, and the Ministry of Education for school-entry guidance. Cultural conventions are labelled as conventions, with links to relevant organisations where available. For text tools, Unicode documentation helps explain character identity and compatibility. A source link is not an endorsement of our service by that organisation, and it does not turn a general-purpose tool into official advice.
What we check before a change goes live
We compare rule-based calculations with their source material and test relevant boundary cases, such as a change of era, an age convention, or a school-year boundary. We also check page links, language metadata, and representative phone and desktop layouts. The checks are selected for the change being made; they cannot reproduce every device, app, or individual circumstance. When a check exposes a limitation, we either correct the implementation or explain the limitation where it affects the result. We do not present an unverified result as a guarantee.
Keeping information current
We review year-dependent data at least annually and revisit affected pages when official information changes or a reproducible error is reported. Tool pages identify their reference year or review date where it matters. The updates page records user-facing additions and corrections so you can see what changed. It is not a real-time service-status monitor. If a future year is outside a tool’s supported range, please use the source organisation’s published information rather than assuming that the last available year still applies.
Advertising and independence
This studio hub does not display advertising. Individual services may use Google AdSense to support their operation, subject to their own notices and consent settings. Our placement policy is to separate advertisements from input controls and copy buttons, preserve space in the layout, and keep the task usable on a small screen. We do not ask visitors to click advertisements. Advertising does not change the arithmetic of a calculator or determine which source is used to explain a date rule.
Languages and accessibility
The hub is available in Korean, English, and Japanese. Each service chooses its languages for its audience and purpose; the hub’s languages do not imply that every tool supports all three. We label the language of every linked tool. We aim for readable type, visible keyboard focus, comfortable touch targets, and layouts that work without decorative motion. Many text styles are made from Unicode characters rather than fonts; they can behave differently with screen readers or in another app. The plain-text version is usually the better choice for essential information.
Corrections and contact
If a result or explanation seems wrong, contact us with the page address, what you expected, and a fictional example that reproduces the issue. For a display problem, the browser and device type can help. Do not send identity documents, passwords, payment details, or another person’s private information. We review messages relevant to our services and may ask for clarification. We cannot provide individual legal advice, verify the contents of official paperwork, or guarantee that another platform will accept a particular character.