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Featured

High-signal tools for the fastest path to value

A curated set of tools to help you get to the right workflow quickly.

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Recommended Samples

Samples that explain how the tools are used

Hubs

Topic clusters with stronger user paths

Visualizations400

Math, Date & Finance638

Calculators, numerics, date logic, statistics, and finance tools

Images, Audio & Video585

Image, audio, and video processing, conversion, and optimization tools

Design & Color291

Color, layout, graphics, visual styling, and design helper tools

Text & Writing203

Writing, cleanup, formatting, extraction, and text analysis tools

Developer & Web172

Developer utilities, networking, web debugging, and automation helpers

Conversion & Encoding169

Format, file, archive, unit, and encoding conversion tools

Audio Encoding and Format Conversion Tools

Image Format Conversion and Animated Export Tools

JSON Interchange and Format Translation Tools

Color Space Conversion Tools for Web and Print

Text Case, Encoding, and Normalization Conversion Tools

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AI Tools

Audio to Text Transcriber (AI)

Transcribe speech from audio (wav/mp3/m4a/flac/ogg/webm/aac) to text, SRT, VTT or JSON using the grok-stt AI model. Up to 10 minutes.

AI Tools

NSFW Image Content Detector

AI content-moderation classifier using NSFWJS to flag uploaded images as safe or potentially inappropriate. Built for moderation and compliance review of your own files — it analyzes uploads only and is not an image search or discovery tool. Supports JPEG/PNG/WEBP/GIF.

Science & Education

Mass-Energy Equivalence Calculator

E = mc² both ways: mass to rest energy (J, kWh, eV-scale, TNT) and energy to mass (kg, g, u, electron masses).

Science & Education

Wavefunction Expectation Value Calculator

Trapezoidal ⟨x⟩, ⟨x²⟩, σ_x and ⟨ψ|ψ⟩ = ∫ψ²dx from pasted real ψ(x) samples — inner products for any discretely sampled wavefunction.

Science & Education

Gravitational Time Dilation Calculator

dτ = dt·√(1 − 2GM/(rc²)) for Earth, Sun, or custom mass: Schwarzschild radius, dilation factor, and daily/yearly clock lag outside the horizon.

Science & Education

Length Contraction Calculator

L = L₀/γ for any subluminal speed: contracted length, contraction percentage, and the transverse-invariance note — muon-atmosphere companion included.

Science & Education

Lorentz Factor Calculator

γ = 1/√(1−v²/c²) with 1/γ, βγ, and √(1−β²) for any subluminal speed — the single number behind all of special relativity.

Science & Education

Planck Blackbody Radiation Calculator

B_λ(T), Wien peak λ_max = b/T, M_λ = πB_λ at the peak and at any wavelength, and the Stefan-Boltzmann total σT⁴.

Science & Education

Quantum Harmonic Oscillator Energy Levels

E_n = (n + ½)ℏω from k + m, ω, or f: zero-point energy ½ℏω, equal spacing ħω, adjacent-transition photon wavelength, classical turning points, optional level ladder.

Science & Education

Rapidity Calculator

φ = artanh(β) with γ = cosh φ, γβ = sinh φ, the e^φ Doppler factor, and the tanh(2φ) additivity check — where boosts just add.

Science & Education

Relativistic Doppler Effect Calculator

Longitudinal Doppler: redshift 1+z = √((1+β)/(1−β)) for receding sources, blueshift for approaching ones, with observed frequency, wavelength, and band labels.

Science & Education

Relativistic Kinetic Energy Calculator

K = (γ−1)mc² with rest, total, kinetic, and classical ½mv² energies in MeV/GeV plus the K/K_classical ratio.

Copyright-Free AAC Audio Samples

High-quality AAC encoded audio samples for testing and development, featuring nature sounds and meditation music with excellent compression

Camera RAW Photo File Samples

Downloadable sample files covering Sony ARW/SRF/SR2, Canon CR2/CR3/CRW, Adobe DNG, Nikon NEF/NRW, Fuji RAF, Olympus ORF, Panasonic RW2, Leica RAW/DNG, and a generic RAW binary file for testing camera RAW upload workflows.

Contentful Cloud-based CMS Samples

Comprehensive Contentful examples covering content modeling, API integration, webhooks, migrations, and frontend integration patterns

BDD with Cucumber - Behavior Driven Development

Comprehensive Cucumber BDD examples including feature files, step definitions, data tables, hooks, and advanced BDD patterns for collaborative development

Cypress E2E Testing Framework

Comprehensive Cypress end-to-end testing examples including test setup, page object models, API testing, visual regression testing, and advanced E2E patterns for modern web applications

Distributed Systems Patterns Samples

Comprehensive distributed systems patterns covering consistency, consensus algorithms, sharding, and fault tolerance mechanisms

Distributed Tracing Samples

Comprehensive distributed tracing examples using Jaeger, OpenTelemetry, and other modern observability tools for microservices architecture

ELK Stack Log Analysis Samples

Comprehensive ELK Stack (Elasticsearch, Logstash, Kibana) samples for log aggregation, processing, and visualization in distributed systems

Audio Encoding and Format Conversion Tools

Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows.

Image Format Conversion and Animated Export Tools

Compare image format converters for JPG, PNG, GIF, AVIF, WebP, TIFF, ICO, base64, and animation-friendly exports in one hub.

JSON Interchange and Format Translation Tools

Compare JSON conversion tools for CSV, YAML, TOML, GraphQL, XML, Markdown, Excel, BSON, EDN, and related structured formats in one hub.

Color Space Conversion Tools for Web and Print

Curated tools for web-to-print color space conversion in one hub.

Text Case, Encoding, and Normalization Conversion Tools

Compare text case conversion, character-width conversion, encoding conversion, quoted-printable handling, and inline text normalization tools in one hub.

Audio Editing and Cleanup Tools

Compare audio trimming, silence removal, fades, mixing, and denoise tools in one hub for podcast, voiceover, and music cleanup workflows.