Browse MCP servers

com.gumballtools/equation-steps

Step-by-step solver for linear/quadratic equations in one variable, signs and ± always right.

com.gumballtools/iso-week

ISO 8601 week numbers: date to week, week to date, weeks-per-year.

com.gumballtools/payload-validator

Validate JSON, YAML, XML and CSV with exact line/column errors and silent-corruption warnings.

com.gumballtools/amortize

Row-by-row loan amortization schedules: monthly or daily accrual, extra principal, PMI, biweekly.

com.gumballtools/platform

One MCP server exposing every tool in the Gumball portfolio.

com.gumballtools/words-in-context

Words-in-context vocabulary practice questions with distractor explanations.

com.gumballtools/timezone-truth

Convert times between IANA zones and detect skipped or ambiguous DST local times.

com.gumballtools/sports-rules

Work an offside call through IFAB Law 11 or NHL Rule 83, step by step.

com.gumballtools/regex-explainer

Explain a regex in plain English and detect catastrophic backtracking risk.

com.gumballtools/penny-rounding

Round cash totals to the nearest nickel correctly — after tax, on the total, cash only.

com.gumballtools/json-to-types

Convert JSON samples into TypeScript interfaces and Zod schemas, with inference caveats.

com.gumballtools/due-date

Estimate a due date from LMP, conception, or ultrasound, with ACOG redating rules.

com.gumballtools/color-companion

Convert colours between hex, RGB, HSL, OKLCH and CMYK, and compute harmonies.

com.gumballtools/body-metrics

Convert height and weight, compute BMI, TDEE and protein targets with error bounds.

com.gumballtools/check-digit

Validates IBAN/ISBN/EAN/Luhn checksums and finds the one wrong digit