AI Note Taker
Capture notes and let the app process them with AI into organized, searchable content.
Practical tools for everyday work.
Calculate. Compare.
Get on with your day.
Calculators and utilities created by Adam Chen for pricing, planning, engineering, files, and routine business tasks.
The collection
A useful tool starts with a specific problem.
Find a calculator or utility for the task in front of you.
These tools grew from everyday work: comparing costs, checking assumptions, handling files, and making recurring calculations easier. Each card describes a specific job.
Have a workflow that needs its own tool? Talk with Adam about a custom solution, or explore the APIs to build one with your agent.
Aspect Ratio Calculator
Calculate screen dimensions and compare common aspect ratios from a chosen width or height.
Open tool ↗Business Card File (AI)
Create and manage digital business-card files with AI-assisted entry and organization.
Open tool ↗CAGR Calculator
Calculate compound annual growth rate between an initial value and a final value over time.
Open tool ↗CP Testing Financial Tradeoff
Compare panel cost and yield assumptions to evaluate CP testing financial tradeoffs.
Open tool ↗Date Duration Calculator
Add or subtract durations from dates and calculate the time between dates.
Open tool ↗DPPM Failure Rates
Convert defect counts into DPPM and estimated sigma-level failure-rate metrics.
Open tool ↗Easy File Transfer
Send a file and retrieve it later through a simple Promptbox transfer code.
Open tool ↗Easy Timesheet
Record work intervals and summarize hours for a simple timesheet.
Open tool ↗eDP Bandwidth Calculator
Estimate eDP link bandwidth from display timing and CVT parameters.
Open tool ↗eDP TCON Calculator
Calculate eDP TCON timing and bandwidth requirements for a display configuration.
Open tool ↗Feature / Cost Tradeoff
Compare product features and costs to see the tradeoff between capability and price.
Open tool ↗IC Temperature Calculator
Estimate integrated-circuit temperature from power, thermal resistance, and ambient conditions.
Open tool ↗Inventory Clearing Pricing
Calculate clearing prices and margins for inventory that needs to move.
Open tool ↗Normalize Numbers
Normalize a set of numbers and inspect summary statistics for the resulting distribution.
Open tool ↗P2P Pair Calculator
Calculate how many point-to-point panel pairs are needed for a configuration.
Open tool ↗Partial Lot Subsidy
Calculate a subsidized price when a shipment contains a partial lot.
Open tool ↗PDF Password Remover
Remove password protection from a PDF when you have the file and its password.
Open tool ↗Percentage Difference Calculator
Calculate the percentage difference between two values.
Open tool ↗Price Reduction Strategy
Model a price reduction strategy and the resulting low-price justification.
Open tool ↗Profit Margin Calculator
Calculate selling price, cost, and profit margin relationships.
Open tool ↗Quick Break-Even Calculator
Estimate the break-even point from fixed costs, variable costs, and price.
Open tool ↗Return on Investment
Calculate return on investment using standard or volume-based inputs.
Size Pictures for Email or Printing
Resize and format pictures for email or printing.
Open tool ↗Time Unit Calculator
Convert time among seconds, minutes, hours, days, and weeks.
Open tool ↗These tools are practical aids and experiments. Check important outputs against your source information and follow the guidance on each app.