Elysia Tools: Tools, Visualizations, and Samples in One Place

ICS Calendar Recurrence Rule Expander

Expand RRULE-based VEVENT recurrence into concrete occurrences and export them as JSON or a flattened ICS calendar

Math, Date & Finance

Decimal to Fraction Calculator

Convert decimals into simplified fractions or mixed numbers with configurable tolerance and denominator limits

Math, Date & Finance

Time Series Forecast & Seasonality Analyzer

Forecast future periods from CSV or JSON time-series data and inspect trend, seasonal, and residual decomposition in one report

Data & Tables

API Breaking Changes Detector & Migration Planner

Compare two OpenAPI 3.x schemas, identify breaking changes, grade client impact, and suggest migration or compatibility strategies

Developer & Web

JWT Decoder & Security Auditor

Decode JWT header and payload, verify HS256 or RS256 signatures, and flag algorithm, expiry, and sensitive-claim security risks

Security & Validation

Distributed Trace Decoder & Waterfall Visualizer

Decode Jaeger, Zipkin, or OpenTelemetry trace JSON and render span timing, dependencies, and error hotspots as an interactive waterfall report

Developer & Web

CSV / Excel Diff Tool

Compare two CSV or XLSX datasets and export a PDF report with row, column, and cell-level differences

Data & Tables

Fraction Calculator

Evaluate fraction expressions, simplify results, and show decimal plus mixed-number forms

Math, Date & Finance

Kuramoto Synchronization Model

Exploring phase transitions in coupled oscillator synchronization

Hodgkin-Huxley Neuron Model

Simulating action potential generation with ion channel gating dynamics

Turing Pattern - Reaction-Diffusion Simulation

Gray-Scott reaction-diffusion model with luminous blue-green pseudocolor waves

Neutron Stars

Extreme matter in the universe: pulsars, magnetars, and compact objects

Universe Expansion

Interactive visualization of cosmic expansion and evolution

Gravitational Waves

Interactive visualization of spacetime ripples from binary black hole mergers

Angular Momentum Conservation

Interactive visualization of L = Iω conservation with rotating platform and adjustable moment of inertia

Center of Mass Motion

Interactive visualization of multi-particle systems and center of mass dynamics

ICS Calendar Samples

Sample iCalendar (.ics) files for testing calendar import, event parsing, reminders, and recurring schedules

3 samples

PCAP Capture Samples

Downloadable PCAP capture files from simple to complex for protocol inspection, parser testing, and packet-analysis demos

3 samples

PCAPNG Capture Samples

Downloadable PCAPNG capture files from simple to complex for parser validation, format comparison, and network-analysis walkthroughs

3 samples

Length Distance Samples

Educational length and distance reference samples covering metric and imperial units, everyday comparisons, and conversion literacy

3 samples

VTT Subtitle Samples

Sample WebVTT subtitle files from simple to complex for subtitle previews, parser testing, conversion, and note handling

3 samples

ASS Subtitle Samples

Sample ASS subtitle files from simple to complex for style-aware subtitle parsing, translation, conversion, and localization QA

3 samples

SRT Subtitle Samples

Sample SRT subtitle files from simple to complex for testing import, translation, conversion, and timing-preservation workflows

3 samples

NDJSON Samples

Downloadable NDJSON files from simple to complex for ingestion, streaming, and pipeline tests

3 samples