The Ultimate Hub for Decision & Draw Tools
Draw numbers, words, ultra-secure passwords, names, groups, and color palettes right in your browser. Fast, lightweight, and completely private.
Tools Directory
Numbers
Draw secure numbers with custom ranges.
Wheel Spinner
Spin the customizable decision wheel.
Lottery Numbers
Lucky numbers for major lotteries.
Words
Discover words with language filters.
Passwords
Generate robust and secure passwords.
UUID & NanoID Generator
Cryptographic UUID v4, UUID v7 (RFC 9562) & NanoID.
Cryptographic Hash & Checksum Generator
Cryptographic Hash Generator (SHA-256, SHA-512, SHA-384, SHA-1).
3D QR Code Generator
Interactive 3D WebGL QR Codes & STL 3D Print.
Names
Authentic first and last names by origin.
Groups & Teams
Divide names into balanced teams.
Colors & Palettes
Harmonious color palettes in HEX, RGB & HSL.
3D RPG Dice
Polyhedral RPG dice with 3D physics.
3D Coin Flip
Realistic 3D coin toss with sound & stats.
Decision (Yes/No)
Instant Yes/No & custom choices.
Letters
Draw letters with multilingual alphabets.
Secret Santa
Secret Santa draw with custom exclusions & private links.
Bingo Caller & Cage
Automated 75 & 90-ball bingo cage with voice caller.
Tournament Bracket & Presentation Queue Generator
Single elimination tournament brackets and presentation queues with pinning.
Guaranteed Mathematical Fairness
SHA-256 Provably Fair ProtocolEvery draw on Ranomio generates a tamper-proof SHA-256 certificate with Provably Fair commitment and Roster Checksums.
Native Web Crypto API (CSPRNG)
Zero Telemetry & 100% Client-SideUnlike generic generators that rely on predictable Math.random(), Ranomio utilizes your browser's native Web Crypto API. Every draw and calculation runs directly on your device — no private data, seed, or password is ever transmitted over the internet.
Guides, Probability Theory & Cryptography
Understanding Cryptographic Randomness: Why Math.random() is Insecure and How CSPRNG Protects Modern Web Apps
Explore the critical differences between standard deterministic PRNGs (Math.random) and cryptographically secure hardware-seeded entropy (Web Crypto API) for fair online draws.
The Mathematics of Probability: Calculating Odds in Dice, Coin Flips, and Lotteries
Learn how to compute exact odds for dice rolls, coin tosses, and multi-ball lottery games using classical combinatorial mathematics.
What is a Provably Fair Algorithm? How SHA-256 Commitments Prevent Online Draw Tampering
Discover the architecture of Provably Fair draws: how SHA-256 cryptographic commitments prove outcomes were not altered during animations or reveals.
Frequently Asked Questions
Is Ranomio completely free to use?
Yes, 100% free with unlimited draws, games, lottery picks, and password generations across all desktop and mobile browsers without requiring registration.
How does cryptographic randomness differ from Math.random()?
Standard JavaScript Math.random() is pseudo-random and predictable. Ranomio uses the Web Crypto API, leveraging OS-level hardware entropy for cryptographically secure, unbiased results.
Can I use Ranomio offline?
Yes! Ranomio is fully Progressive Web App (PWA) compatible. You can install it on your device and execute all generators without an active internet connection.
How do I verify the authenticity of a draw?
Every completed draw produces a unique certificate containing a SHA-256 hash and seed commitment. You can verify it anytime on our Verify page.