UD5 Toolkit
Crossword Puzzle Maker - Online Simple Grid Builder
Build a small crossword by adding words and clues. Export as a printable PNG or JSON. For classroom and fun.
Logic Grid Puzzle Solver & Maker - Online Deduction Tool
Logic Grid Puzzle · Solver & Maker
Categories
Clues
📘 Frequently Asked Questions
A logic grid puzzle presents a set of categories (e.g., names, colors, pets) with several items each. You are given clues that link items across categories. The goal is to deduce the complete mapping of all items using a grid to mark true (√) or false (×) relationships.
Switch to Solver mode. Click any cell in a grid to toggle between unknown → true (√) → false (×) → unknown. Use the Auto Solve button to apply basic deduction rules automatically. The tool propagates constraints and highlights possible next moves.
Yes! Switch to Maker mode. Add categories and their items. Then add clues using the “Add Clue” button. Clues can be applied to the grid automatically. You can export your puzzle as a JSON file to share or solve later.
The engine repeatedly applies: (1) If a cell is marked true, all other cells in the same row and column become false. (2) If a row/column has only one possible true cell (all others false), it is marked true. (3) Cross‑grid synchronization: a true in one grid implies false for incompatible pairs across other grids.
Your work is temporarily stored in your browser. For permanent storage, use Export to save a JSON file. You can later Import it to resume. No data is sent to any server.
It combines a full‑featured solver with a maker in one responsive page. You can build puzzles visually, add clues in plain language, and instantly see the grid update. Undo/redo, export/import, and a clean mobile interface make it ideal for puzzle lovers and designers alike.
Crossword Builder - Online Create & Solve Simple Puzzles
Build a small crossword by adding words and clues. Export as a printable grid or solve in browser. Perfect for classrooms.
Decision Tree Builder - Online Visual Yes/No Path
Build a simple decision tree by adding yes/no nodes. Flowchart style. Export as text outline.
Pros & Cons List Maker - Online Decision Helper
Create a weighed pros and cons list with a score. Help make tough decisions. Data saved locally.
Tab Focus Order Checker - Online Visualize Tab Navigation Flow
Paste HTML and see the order in which elements would receive focus via Tab key. Highlight issues. Local accessibility testing.
CSS Grid Auto Placement Demo - Online How Items Flow
See how grid-auto-flow: row vs column changes item placement. Add and remove items to understand the algorithm. Visual.
Crochet Stitch & Row Counter – Online with Pattern Repeat
Multiple digital counters for tracking stitches, rows, and pattern repeats. Increment, reset. Works on mobile.
CSS Grid Area Template Generator - Online Visual Naming
Visually name grid areas in a table and generate grid‑template‑areas CSS. Perfect for complex layouts. Drag‑free.
CSS Grid Named Lines Demo - Online Complex Layouts
Use named grid lines instead of column numbers. See how they simplify placement. Visual, interactive learning.
Shopping List Builder - Online Categorized Grocery Checklist
Create categorized shopping lists (produce, dairy, meat, etc.). Add items, check them off, and print. Data stored in your browser. Never lose a list.
Pathfinding Visualizer - Online A*, Dijkstra & BFS Grid
Draw walls on a grid and watch A*, Dijkstra, or BFS find the shortest path. Interactive animation. Learn graph traversal.
Lighting Diagram Creator - Online Studio Setup Planner
Drag and drop light sources, camera, and subject to plan a photo shoot. Export diagram as image. Simple and visual.
Venn Diagram Builder - Online 2‑ & 3‑Set Overlap Visualizer
Create simple 2‑ or 3‑set Venn diagrams by entering comma‑separated lists. Shareable via URL fragment. No account.
Sorting Algorithms Visualizer - Online Bubble, Quick & Merge
Watch classic sorting algorithms step through a randomized bar chart. Adjust speed and array size. Great for learning algorithm efficiency.
Prime Factor Tree Generator - Online Visual Factorization
Enter a number and see an animated factor tree breaking it down to primes. Perfect for teaching factorization.
DMARC Record Generator - Online Email Policy Builder
Create a DMARC policy record with percentage, reporting addresses, and alignment mode. Validate and copy the final DNS TXT.
Alphabet Tracing Worksheet - Online Preschool Letter Practice
Generate customizable alphabet tracing sheets with uppercase and lowercase letters. Select letters to focus on. Instant print. Local only.
Basic Grammar Checker - Online Free Writing Assistant
Identify common grammar mistakes (subject-verb agreement, tense, articles) with simple rule-based analysis. Explanations provided. Not AI, purely rule-based and local.
TOML Formatter & Validator - Online Config Tool
Check and beautify your TOML config files. Highlights errors and aligns tables and arrays. Safe local parsing.
CSS Beautifier & Formatter - Online CSS Organizer
Beautify and format your CSS stylesheets instantly. Organize, minify, or prettify CSS code for better readability. Processed securely on client-side.
Paraphrase Comparison Tool - Online Spot the Rewrite
Paste two versions of the same idea and see a word‑level diff highlighting the rewrite. Not AI, just diff.
Bead Pattern Designer – Online Visual Stringing Sequence
Drag colored beads onto a virtual thread to design a repeating pattern. See total length. Save locally.
Folding Fitted Sheet Guide – Online Step‑by‑Step Animation
Animated SVG steps showing how to fold a fitted sheet perfectly. Clean visual reference.
Structured Data Testing Tool - Online Validate Rich Results
Paste your JSON‑LD or Microdata and test it against Google's Rich Results criteria. Get warnings. Local linter.
Name Tracing Worksheet Generator – Online Your Child's Name
Type a child's name and create a printable dotted trace sheet. Practice fine motor skills. Local only.
DNS Lookup - Online Domain Records Checker (A, MX, CNAME)
Query DNS records for any domain directly from your browser using DNS-over-HTTPS. See A, AAAA, MX, CNAME, and TXT records. No logs.
Focus Order Analyzer - Online Tab Navigation Check
Enter a URL and extract tab‐index order violations and focusable elements. Quick accessibility audit. Client‑side fetch.
Name Tent Generator - Online Print Foldable Desk Cards
Type names and generate folded name tents for desks. Print, cut, fold. Great for workshops and panels.
Neumorphism Card Builder - Online Soft UI Generator
Design a soft, extruded card with inner and outer shadows. Adjust depth and roundness. Copy the CSS.
Blood Pressure Category Checker - Online AHA & ESC Guideline Tool
Interpret your blood pressure reading based on American Heart Association and European Society of Cardiology categories. Visual gauge with actionable health insights.