Unit Circle Visualizer - Online Trigonometry Interactive Chart
Drag an angle around the unit circle and see sin, cos, tan values change live. Degrees and radians display. Perfect for learning trig.
UD5 Toolkit
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Drag an angle around the unit circle and see sin, cos, tan values change live. Degrees and radians display. Perfect for learning trig.
Plot one or more mathematical functions f(x) on a 2D canvas. Zoom, pan, and see intersections. Great for calculus and algebra. Purely client‑side.
Simulate paint colors on a pre-loaded room photo by adjusting hue, saturation. Find your perfect shade before buying. Local canvas.
Upload an image and see its 2D FFT magnitude and phase. Learn how image filtering works. Educatinal tool. Canvas.
Watch a simulation of how the JavaScript event loop handles synchronous code, microtasks, and macrotasks. Learn async.
Input telescope and eyepiece parameters to see a simulated view of the Moon or Andromeda. Plan observations.
Set a cron expression and see a calendar of the next 1,000 execution times. Never miss a schedule again.
Enter a list of options and spin the wheel to make a random selection. Perfect for giveaways, classroom activities, and decision making. Fun and interactive.
Drag a battery, resistor, LED onto a grid and simulate current flow. Show Ohm's law in action.
Paste a JSON object and see a dynamic, draggable tree graph representation. Excellent for debugging nested data.
Combine a Pomodoro timer with a simple task list. Assign estimated Pomodoros to tasks and track completions. Boost focus and get things done.
Enter a GraphQL endpoint, write a query, and see the response. Add headers and variables. Simple testing client.
Click to build a laundry symbol and learn its meaning, or look up common symbols. Never ruin clothes again.
Pop the virtual bubble wrap with mouse or touch. Satisfying sound and reset button. Pure stress‑busting fun in your browser.
Select telescope and eyepiece parameters to see the field of view circle on a simulated night sky image.
Generate a QR code with a custom text label below or above. Perfect for printed signs. All generated locally as a single image.
Enter item dimensions and find the smallest rectangular box that can fit them (simple packing heuristic). Helps reduce shipping costs. Local algorithm.
Click to get a randomly generated, unique favicon. Download as .ico or SVG. For when you need a quick icon.
Upload an image, write text, and place it anywhere. Choose font, size, and color. Download the combined image. Private.
Crop and zoom into an image using the object‑view‑box property. Define inset(). Great for responsive art direction.
Map English letters to fancy mathematical or ornamental Unicode symbols. Create Facebook/Twitter bio art. All local.
Paste a JWT and a public key or secret to verify the signature. Supports HS256, RS256, ES256. All operations local.
Manipulate RGB and brightness curves with interactive splines. Apply professional color grading to your images. Fully in-browser.
Test prompt formatting without calling an LLM. See how your prompt would look with different templates. Dev tool.
Calculate load capacitors for a crystal oscillator given stray capacitance and crystal CL. Essential for microcontroller circuit design. Local.
See interactive Venn diagrams for SQL JOINs: INNER, LEFT, RIGHT, FULL, CROSS. Understand set theory visually. Local static site.
Build cron expressions using a visual editor with dropdowns. See human-readable description and next run times. Easier than raw cron.
Decode the header and payload of a JSON Web Token (JWT) without verifying the signature. Inspect claims securely on the client side. Great for developers.
Generate a temporary webhook URL (mock) and view the JSON payloads sent to it. Great for testing integrations locally.
Browse thousands of Unicode characters, search by name or code, and copy symbols to clipboard. Supports emojis, arrows, and math symbols.