UtilityStacks

Your everyday stack of useful tools.

Fast, private tools for code, work and everyday life.

Most tools run in your browser and never upload your data.

Shortcut: Ctrl/Cmd + K

Popular tools

Showing all developer tools, Wheel of Names, and one representative from each remaining category until GA4 sufficiency thresholds are met.

Browse all
IQ

IQ Practice Test

Try an unofficial IQ-style reasoning practice test with transparent scoring.

Tests

WEB

HTML/CSS/JS Playground

Edit HTML, CSS, and JavaScript with live sandbox preview and console output.

Developer

🎡

Wheel of Names

Spin a wheel to pick a winner randomly from your list.

Random

SQL

SQL Playground (SQLite)

Run SQLite queries in your browser with schema explorer and tabular results.

Developer

{}

JSON Formatter

Format or minify JSON instantly in your browser.

Developer

JSON Validator

Validate JSON and see clear error details.

Developer

URL

URL Parser / Builder

Parse URL parts and build normalized URLs using browser-native URL APIs.

Developer

%

Percentage Calculator

Solve common percentage calculations quickly.

Calculators

Pomodoro Timer

Stay focused with a simple work/break timer.

Productivity

🪪

JWT Encoder & Builder

Build JWTs from header and payload JSON, with optional local HMAC signing.

Developer

XO

Tic-Tac-Toe

Play a single-player Tic-Tac-Toe game against a browser opponent.

Games

JQ

JSONPath Tester

Query JSON documents using JSONPath and inspect formatted results.

Developer

Aa

Word Counter

Count words, characters, and reading time.

Text

IMG

Image Converter

Convert PNG, JPG, and WebP images locally with resize and quality controls.

Converters

LINQ to SQL Converter

Convert common LINQ query patterns into SQL drafts.

Developer

.*

Regex Tester

Test JavaScript regular expressions with matches, capture groups, and replace preview.

Developer

JS

JavaScript Playground

Run JavaScript code in an isolated sandbox and inspect logs and errors.

Developer

#

UUID Generator

Generate and customize UUID values with selectable versions.

Developer

SQL to LINQ Converter

Convert common SQL query patterns into LINQ method syntax drafts.

Developer

API

REST API Tester

Build and send HTTP requests from your browser, then inspect status, headers, and response bodies.

Developer

🔑

JWT Decoder

Decode JWT header and payload safely in your browser.

Developer

🔒

Password Generator

Generate strong passwords with secure randomness.

Security

All Tools by Category

Explore every UtilityStacks tool in category carousels.

Developer

Developer01

JSON Formatter

Format or minify JSON instantly in your browser.

Open tool
Developer02

JSON Validator

Validate JSON and see clear error details.

Open tool
Developer03

JWT Decoder

Decode JWT header and payload safely in your browser.

Open tool
Developer04

JWT Encoder & Builder

Build JWTs from header and payload JSON, with optional local HMAC signing.

Open tool
Developer05

LINQ to SQL Converter

Convert common LINQ query patterns into SQL drafts.

Open tool
Developer06

SQL to LINQ Converter

Convert common SQL query patterns into LINQ method syntax drafts.

Open tool
Developer07

UUID Generator

Generate and customize UUID values with selectable versions.

Open tool
Developer08

SQL Playground (SQLite)

Run SQLite queries in your browser with schema explorer and tabular results.

Open tool
Developer09

HTML/CSS/JS Playground

Edit HTML, CSS, and JavaScript with live sandbox preview and console output.

Open tool
Developer10

JavaScript Playground

Run JavaScript code in an isolated sandbox and inspect logs and errors.

Open tool
Developer11

Regex Tester

Test JavaScript regular expressions with matches, capture groups, and replace preview.

Open tool
Developer12

JSONPath Tester

Query JSON documents using JSONPath and inspect formatted results.

Open tool
Developer13

REST API Tester

Build and send HTTP requests from your browser, then inspect status, headers, and response bodies.

Open tool
Developer14

URL Parser / Builder

Parse URL parts and build normalized URLs using browser-native URL APIs.

Open tool

Calculators

Explore & Discover

Explore internal astronomy experiences curated by UtilityStacks.

Inspect planet order, distance, and approximate current orbital positions in an educational layout.

Solar System Explorer

Approximate
Sun
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune

Educational approximation with labeled objects and keyboard-accessible selection.

Selected object

Earth

Order from Sun
3
Mean distance
1 AU
Radius
6,371 km
Day length
24 h

Orbital period: 365.256 days

Source basis: NASA Planetary Fact Sheet values represented with an approximate orbital model.

Weather

Compact local weather dashboard with hourly and daily outlooks. A small supporting location image appears when available.

Developer references

Fast links to standards and API docs that map directly to the tooling on this site.

JSON syntax and parsing

Understand strict JSON format rules and parser behavior before validating API payloads.

JWT structure and claims

Review compact token format and claim semantics when building authentication diagnostics.

Why UtilityStacks

  • Focused tools with direct utility for daily engineering and team workflows.
  • Most interactions are browser-local to minimize data handling risk.
  • Code-oriented sections map each tool operation to practical programming APIs.
  • Small, fast pages that remain useful even when external services are unavailable.

FAQ

Do tools upload my data?

Most tools process content in your browser. Avoid pasting production secrets into any web form.

How are Popular Tools chosen?

When enough aggregate GA4 usage data exists, the list reflects top tool-use events from the last six months. Otherwise it shows all developer tools, Wheel of Names, and one representative from each remaining category.

Can I find all tools if popularity data is unavailable?

Yes. Category pages and search still expose the full catalog even when the home popularity module runs in fallback mode.