FizzBuzz Interactive Tester - Online Coding Classic
Run the classic FizzBuzz with custom rules. See the output for any range. A beginner programmer's playground.
UD5 Toolkit
Create fill-in-the-blank exercises from any text. Perfect for language learning, teaching, and self-assessment.
Run the classic FizzBuzz with custom rules. See the output for any range. A beginner programmer's playground.
Set a cron expression and see a calendar of the next 1,000 execution times. Never miss a schedule again.
Generate a sheet of random arithmetic problems (+, -, ×, ÷) with configurable digits. For kids and brain training.
Click to see a random, verified fun fact from science, history, and nature. Perfect for icebreakers. Static data.
Generate a random potion with a color, effect, and ingredient list. Ideal for RPG item shops and worldbuilding.
Enter a list of words and generate a custom word search puzzle in PDF/PNG format. Great for teachers and parties. Local.
Create random strings of any length using custom character sets. Perfect for generating API tokens, salts, and unique codes. Fully client-side secure.
Fill in a table name and columns, and the tool writes the correct SQL INSERT, UPDATE, DELETE, and SELECT queries. For quick scaffolding.
Build cron expressions using a visual editor with dropdowns. See human-readable description and next run times. Easier than raw cron.
Create a tailored cover letter based on job title, your skills, and a template. Download as text or PDF print. Private.
Create a foreboding dungeon name for your next D&D adventure. With optional adjective and location. Pure fantasy fun.
Test prompt formatting without calling an LLM. See how your prompt would look with different templates. Dev tool.
Generate random icebreaker questions for meetings, parties, or classrooms. Categories for work, fun, and deep talks.
Create a Review or aggregateRating structured data. Perfect for star ratings in search results. Copy the code.
Describe cron schedule expressions in plain English and test future execution times. Indispensable for DevOps and backend developers. Local analysis.
Simulate paint colors on a pre-loaded room photo by adjusting hue, saturation. Find your perfect shade before buying. Local canvas.
Input any JavaScript object and see if structuredClone can deep‑copy it. Compare with JSON.parse/stringify. Learn transferables.
Simulate memory page reference strings with FIFO, LRU, and Optimal algorithms. See page fault count. OS concept demo.
Generate a random emoji for reactions, game prompts, or just fun. Full Unicode emoji set. One-click copy.
Click for a random drawing or sketching idea. Characters, objects, scenes. Beat artist's block. All local.
Calculate load capacitors for a crystal oscillator given stray capacitance and crystal CL. Essential for microcontroller circuit design. Local.
Request notification permission and create a push subscription. See the subscription object. Learn how web push works.
Paste a list of names and split them into a specified number of random teams. Perfect for sports and classrooms.
Fill in a form to generate a valid package.json for your Node.js project. Includes popular scripts and fields. Local only.
Fill in a few details and get a polished resignation letter. No data stored. Instant copy or print.
Click to build a laundry symbol and learn its meaning, or look up common symbols. Never ruin clothes again.
Create a futuristic robotics or AI startup name with an available .com domain check simulation. For brainstorming.
Build a complex mailto: link with to, cc, bcc, subject, and body. Get the HTML anchor tag. Local.
Make your text look like the Dunder Mifflin logo heading. Bold, wide‑spaced, and ready to copy. For fans.
Create a rebus puzzle by combining emojis and letters, then challenge friends to solve. Fun brain teaser.