Assumptions Map
Surface, prioritize, and test the assumptions behind your decisions
View Guides →Tool Guides & Tutorials
In-depth guides for getting the most out of InnoviCat tools. Each guide covers practical use cases, step-by-step workflows, and expert tips — written by engineers with real-world experience.
Decisions
Music
Binaural Beats Generator
Create binaural beats for sleep, relaxation, focus, and meditation with adjustable frequencies and session timer.
View Guides →BPM Tapper
Tap along to any song to detect its BPM — with real-time averaging and tap history.
View Guides →DTMF Tone Generator
Free DTMF tone generator with frequency reference table. Play all 16 touch-tone signals (697–1633 Hz), dial sequences, export WAV files, and generate telecom tones.
View Guides →Metronome
Free online metronome with subdivisions, speed trainer, tap tempo, and 6 time signatures.
View Guides →Rhythm Trainer
Diagnose and train your sense of rhythm — beat, inner pulse, subdivision, and imitation — with millisecond timing feedback.
View Guides →Speaker Test
Test your speakers or headphones right in your browser: check left and right channels, stereo balance, bass, full-range sweeps, and speaker polarity.
View Guides →Online Tone Generator
Free online tone generator, sine wave generator, and pitch generator. Play pure tones from 20 Hz to 20 kHz with 6 waveforms, frequency sweep mode, and WAV export.
View Guides →Developer
Color Contrast Checker
Check and calculate WCAG contrast ratios between text and background colours for accessibility compliance.
View Guides →Velvet MD - Markdown Beautifier
Transform markdown into beautifully styled documents with live preview and export to HTML, PDF, or DOCX.
View Guides →Cooking
Crowd Food Calculator
Calculate food quantities per guest count for any event. Supports sit-down dinners, buffets, BBQs, and appetizer parties with 6 event presets and adjustments for kids, appetite, and duration.
View Guides →Grams to Cups Converter
Free grams to cups converter — convert grams to cups, tablespoons, and teaspoons for 50+ baking ingredients using USDA density data.
View Guides →Recipe Scaler
Scale any recipe instantly — paste ingredients, set servings, get adjusted quantities with clean fractions. Free, private, works offline.
View Guides →Engineering
Decimal Feet Converter
Convert between feet-and-inches (with fractions) and decimal feet. Bidirectional with quick reference table.
View Guides →Duct Size Calculator
Calculate HVAC duct dimensions from airflow (CFM). Supports round and rectangular ducts with velocity validation.
View Guides →Duct System Planner
Free HVAC duct size calculator and system planner. Auto-size ducts by CFM from plenum to registers, calculate friction loss and total pressure drop per ASHRAE and ACCA standards.
View Guides →Insulation R-Value Calculator
Calculate insulation R-value for wall assemblies, attics, and floors. Check IECC 2021 code compliance by climate zone.
View Guides →Voltage Drop Calculator
Calculate voltage drop and select optimal wire sizes for electrical circuits. Supports NEC, IEC, and BS 7671 standards with ampacity derating.
View Guides →Math
GPA Calculator
Calculate your GPA from course grades and credits.
View Guides →Grade Calculator
Calculate grades, weighted averages, final exam scores, and grade curves instantly.
View Guides →Image Tools
Image Watermark
Batch watermark photos with text, logos, tiling, 18 fonts, and ZIP download
View Guides →Spectra Image Generator
Generate royalty-free images with 237 generative art styles. Perfect for backgrounds, placeholders, and creative projects.
View Guides →Financial Calculators
Investment ROI Calculator
Calculate your rate of return on any investment — ROI percentage, annualized returns (CAGR), and net profit analysis.
View Guides →Estimate & Invoice Generator
Create professional invoices and estimates with automatic calculations
View Guides →Retirement Calculator
Plan your retirement savings and check if you're on track.
View Guides →Text
InnoviCat Lorem
Generate placeholder text with 26 themed generators, 7 output types, and vocabulary statistics.
View Guides →Time
Time Calculator
Add, subtract, multiply, and divide hours, minutes, and seconds easily.
View Guides →Time Zone Converter
Find the time difference between any two cities. Convert times across 600+ cities using the IANA time zone database with DST handling, UTC offsets, and a meeting planner.
View Guides →