Teaching resources
Classroom and self-study tools grounded in a public textbook, curriculum, or clearly stated mathematical method.
Build a useful calculator with us
We are open to proposals from teachers, public-interest organizations, and subject publishers who want to turn a public method into a transparent interactive tool.
Current status: this is an open invitation, not a directory of existing partners. We have not published partner logos, completed case studies, or outcome claims.
Projects that fit
Planning estimators
Transparent project estimates for quantities, materials, schedules, or costs, with editable assumptions and no safety or code-compliance promise.
Public-interest explainers
Interactive versions of an official public formula or dataset that help readers inspect the method and reproduce the result.
How a proposal is evaluated
- Define the user decision. Tell us who the tool serves and what question it should answer.
- Provide the public method. Share the primary source, formula, definitions, units, and known limits.
- Agree on a reproducibility boundary. We document source dates, assumptions, test cases, risk classification, and what the calculator must not claim.
- Publish only after deterministic checks pass. Accepted work follows the same production registry and testing contract as Trusty Calculator pages.
Collaboration principles
- No backlink requirement
- A link is optional and never determines acceptance. We do not exchange tools, rankings, or placement for follow links or keyword-rich anchor text.
- No invented authority
- YunFanLabs is the organizational author. AI may assist the work, but no human expert, certification, endorsement, or partner approval is claimed without public evidence.
- No private user data
- Analytics must not capture calculator inputs, results, free text, identifiers, or query strings. A proposal should not require sharing sensitive records.
- No prohibited risk transfer
- We do not publish direct drug dosing, emergency triage, poisoning decisions, diagnostic conclusions, hazardous recipes, or claims of professional safety compliance without the required human governance.
What to include in an email
Include the intended audience, the public source URL, a short description of the calculation, the desired canonical publisher, and any deadline. Do not send personal records, credentials, proprietary datasets, or confidential attachments.
Email support@yunfanlabs.com. A proposal is not an acceptance, endorsement, or guarantee that a calculator will be built.