World Capitals List & Search - Online Reference
Search by country or city to find the capital. Full offline list. Useful for homework or travel planning. Static data.
UD5 Toolkit
Search by country or city to find the capital. Full offline list. Useful for homework or travel planning. Static data.
Generate realistic‑sounding full names for over 20 nationalities and genders. Perfect for fiction writing or test personas. Local.
Shows a random historical event that occurred on today's date. Fun daily knowledge snippet.
Enter the correct answer and accept player entries. Highlights correct ones. Simple scorekeeper for home trivia.
Generate a LocalBusiness structured data snippet with name, address, phone, and opening hours. Boost local SEO.
Test prompt formatting without calling an LLM. See how your prompt would look with different templates. Dev tool.
Drop landmarks onto an aged parchment background to create a custom treasure map. Print for kids.
Combine a Pomodoro timer with a built‑in to‑do list. Estimate pomodoros per task, track completed sessions, and see daily progress. All data stored locally.
Allocate your monthly income into virtual envelopes by category. Track spending and see remaining balances. LocalStorage.
Calculate load capacitors for a crystal oscillator given stray capacitance and crystal CL. Essential for microcontroller circuit design. Local.
Select a repair type (leaky faucet, paint room, etc.) and get a typical cost range. Simple general guide, no personal data.
Create a foreboding dungeon name for your next D&D adventure. With optional adjective and location. Pure fantasy fun.
Browse thousands of Unicode characters, search by name or code, and copy symbols to clipboard. Supports emojis, arrows, and math symbols.
Generate a random name for a board game or card game. Combines adjectives and nouns. Ignite your game design creativity.
Open many parallel WebSocket connections and send messages. Test your server's concurrency. All from your browser.
Upload an image, write text, and place it anywhere. Choose font, size, and color. Download the combined image. Private.
Compute confidence intervals for a population mean (known/unknown sigma) and proportion. All popular Z/T values. Local.
Simulate paint colors on a pre-loaded room photo by adjusting hue, saturation. Find your perfect shade before buying. Local canvas.
Execute GraphQL queries against any endpoint with variables and headers. Explore schema via introspection. All requests made directly from your browser.
Set a cron expression and see a calendar of the next 1,000 execution times. Never miss a schedule again.
A super lightweight Kanban board with drag‑and‑drop. Columns: To Do, Doing, Done. Data stays in your browser.
Create a dystopian cyberpunk character name (handle or real). Perfect for Shadowrun or Cyberpunk RED.
Run the classic FizzBuzz with custom rules. See the output for any range. A beginner programmer's playground.
Generate a plausible technical blog post title. Useful for practice writing or placeholder content. All local.
Combine a Pomodoro timer with a simple task list. Assign estimated Pomodoros to tasks and track completions. Boost focus and get things done.
Paste a JSON array and filter/transform it using a simple path expression. Extract nested values without code. Local.
Format and beautify SQL queries for improved readability. Supports various SQL dialects. Quick syntax highlighting and local processing ensure a secure experience.
Adjust letter‑spacing and word‑spacing with a slider and see the effect on a sample paragraph. Copy the CSS.
Scroll down to see images load lazily. Code snippet provided. Learn how native loading='lazy' works.
Map English letters to fancy mathematical or ornamental Unicode symbols. Create Facebook/Twitter bio art. All local.