Math & Numbers
Compute complex impedance, magnitude |Z| and phase angle φ for series or parallel RLC circuits: X_L=2πfL, X_C=1/(2πfC), |Z|=√(R²+X²), φ=atan2(X,R). Supports any subset of R/L/C and an optional linear frequency sweep.
impedance-calculatorFinance
Project investment growth with initial principal plus monthly contributions and compound interest. Supports compounding frequency, inflation-adjusted real value, and yearly contribution escalation, with a yearly breakdown table and nominal vs real balance curves.
investment-calculatorValidation
Validate International Securities Identification Numbers (ISO 6166 ISIN) with Luhn check-digit verification, country/issuer prefix and NSIN breakdown.
isin-validatorNetwork
Visualize the geographic location, network (ASN/ISP), timezone, and security posture of any IP address as a rich card report
ip-geolocationDevelopment
Convert between natural-language durations and ISO 8601 durations (PnYnMnDTnHnMnS) in both directions with validation of edge cases
iso-8601-duration-builderAstronomy
Predict ISS, Hubble, and representative Starlink passes for a chosen observing point and date
iss-satellite-pass-trackerDesign
Generate wiggle stereoscopy GIFs that create 3D effect by rapidly alternating between left and right eye perspectives. No 3D glasses required!
image-wiggle-stereoscopyMath & Numbers
Convert inches to yards with configurable decimal precision
inches-to-yardMath & Numbers
Convert inches to meters with configurable decimal precision
inches-to-meterMath & Numbers
Convert inches to millimeters with configurable decimal precision
inches-to-mmMath & Numbers
Calculate Q1, Q3, IQR, and optional 1.5 x IQR outlier fences for a numeric dataset
interquartile-range-calculatorMath & Numbers
Convert inches to centimeters with configurable decimal precision
inches-to-cm