Ready to use
Math, Statistics & Probability
Open tool Sum of Positive Divisors Calculator
Sum every positive divisor through exact prime-power geometric factors.
Home/All tools
PUBLISHED TOOL DIRECTORY
Useful tools, ready when you are.
Every card opens a working workspace. Pick the job, use the tool, and move on.
LIVE DIRECTORY
Pick a tool. Get it done.
Ready to use
Physics
Open tool Supersonic Mach Angle Calculator
Calculate ideal disturbance-cone half-angle from a strictly supersonic Mach number.
Ready to use
Ecommerce & Marketplace
Open tool Supplier Comparison Matrix
Create a bounded, editable supplier comparison matrix from supplied merchant data with transparent rules and commerce safeguards.
Ready to use
Productivity & Business Ops
Open tool Supplier Defect Unit Rate Calculator
Measure inspected received units classified as nonconforming under one plan.
Ready to use
Quality Assurance
Open tool Supplier Quality Audit
Create a bounded, reviewable supplier quality audit with visible assumptions, downloadable output, and accountable human review.
Ready to use
Construction & Manufacturing
Open tool Supplier Quality Checklist
Create a bounded, editable supplier quality checklist from supplied project data with transparent assumptions and professional safeguards.
Ready to use
Productivity & Business Ops
Open tool Supplier Response Deadline Rate Calculator
Measure due supplier requests answered with evidence by deadline.
Ready to use
AI-assisted Utilities
Open tool Support Reply Draft Helper
Create a bounded, browser-local support reply draft helper with visible assumptions, review guidance, and downloadable output.
Ready to use
Calculators
Open tool Surface Area Calculator
Calculate closed surface area for four common solid shapes.
Ready to use
Units & Measurement
Open tool Surface Charge Density Converter
Convert known charge per area without deriving a field or surface model.
Ready to use
Math, Statistics & Probability
Open tool Surjective Function Count Calculator
Count onto functions between supplied labelled finite sets.
Ready to use
Finance & Business
Open tool Sustainable Growth Rate Calculator
Estimate internally supportable growth from return on equity and earnings retention.