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273 apps · Showing 1–96

Developer Tools

273 apps

Developer Tools: Capture & Preview

Above-the-Fold Screenshot

Save the first screen visitors see before they scroll.

CSS-Free Website Preview

See the page structure without its style sheets.

Custom Viewport Screenshot

Choose an exact browser width and height for the screenshot.

Dark Mode Website Screenshot

Ask the page for its dark colour scheme and capture the result.

Forced Colours Website Preview

See how the page looks with system forced colours.

Full Page Screenshot

Capture the page from top to bottom, up to a safe height.

High-DPI Website Screenshot

Capture a sharper two-times pixel density image.

Image-Free Website Preview

See whether the page still makes sense when images do not load.

JavaScript-Off Website Screenshot

See what the page shows when JavaScript is turned off.

Light and Dark Screenshot Comparison

Capture the same page in light and dark colour schemes.

Light Mode Website Screenshot

Ask the page for its light colour scheme and capture the result.

Mobile Landscape Screenshot

Capture a wide phone view for menus, games, and videos.

Mobile Website Screenshot

See a public page in a 390 pixel phone view.

Print Layout Screenshot

Preview the page with print styles before making a PDF.

Reduced Motion Website Preview

See the page with reduced motion turned on.

Responsive Screenshot Pack

Capture desktop, tablet, and phone views in one run.

Tablet Website Screenshot

See a public page in a roomy tablet view.

Web Page Quality Snapshot

Open a public page and get a clear screenshot with its main quality facts.

Web Page to PDF

Turn a public web page into a clean PDF with backgrounds.

Wide Desktop Screenshot

Capture a 1600 pixel desktop view.

Developer Tools: Errors & Network

Download Link Inventory

Find links that look like file downloads without clicking them.

Failed Web Request Checker

Find network failures and HTTP error responses seen while the page loads.

JavaScript Console Error Checker

Open the page and collect browser console errors and warnings.

Page Performance Timing Snapshot

Show browser navigation, paint, and content timing from one page load.

Third-Party Host Inventory

List outside hosts contacted while the page loads.

Web Font Inventory

List font files requested and font families used on the page.

Web Page DOM Size Checker

Count page elements and show the deepest nesting found.

Web Page Network Request Summary

Count page requests by type and host.

Web Page Redirect Chain Checker

List each page URL followed before the final page opened.

Web Page Resource Weight Estimate

Estimate transferred bytes reported by the browser for this page load.

Developer Tools: Accessibility & Quality

ARIA Accessibility Snapshot

Create a text view of the page accessibility tree.

Browser Language Website Preview

Open the page with a browser language such as French Canada.

Time Zone Website Preview

Open the page in another time zone and capture what it shows.

Web Page Scroll Size Checker

Measure the full page width and height and flag sideways scrolling.

Developer Tools: Content & Structure

Canonical URL Checker

Check whether the page names one clear canonical URL.

Favicon and Icon Inspector

Find favicons, touch icons, and web app icons named by the page.

Heading Outline Extractor

List the H1 to H6 headings in page order.

Page Language Checker

Check the page language and direction settings.

Page Title and Description Checker

Check the page title and search description length.

Structured Data Extractor

Find JSON-LD blocks and show their main schema types.

Web Page Control Inventory

List buttons, inputs, selects, and text areas with their labels.

Web Page Form Inventory

List forms, methods, actions, and control counts.

Web Page Image Inventory

List images with alt text, size, and loading style.

Web Page Landmark Inventory

Count headers, navigation, main areas, asides, and footers.

Web Page Link Inventory

List page links and show which ones leave the website.

Web Page Metadata Extractor

Collect the title, description, language, canonical link, and viewport settings.

Web Page Table Inventory

List each table with its caption, row count, and column count.

Web Page Text Extractor

Pull out the visible words from a public page.

Website Technology Hint Scanner

Find public clues for common site builders and front-end tools.

Developer Tools: Format & Encode

Base64 Encoder & Decoder

Encode Unicode text or files to Base64, decode Base64 safely, and switch to URL-safe output when needed.

JSON Formatter & Validator

Format, minify, sort, repair, and inspect JSON with clear line-and-column errors and a searchable tree view.

URL Encoder & Decoder

Encode or decode a full URL, one query value, or form data, then inspect every query parameter in a readable table.

Developer Tools: Format & Validate

XML Formatter

Add clean spacing and line breaks to messy XML without sending it anywhere.

XML Minifier

Make a smaller XML copy by removing display-only spaces and line breaks.

XML Validator

Check tags, quotes, and closing marks, then get a short message that points to the problem.

Developer Tools: Convert & Clean

JSON to XML Converter

Turn a JSON object into clean XML, including attributes marked with @_ and text marked with #text.

XML Namespace Cleaner

Remove prefixes such as store: and meta: to make a simpler XML copy for basic tools.

XML to JSON Converter

Convert elements and attributes into JSON that is easy to read, copy, and use in code.

Developer Tools: Explore & Extract

XML Attribute Extractor

Pull attribute names and values into a CSV table with the path to each element.

XML Element Finder

Search an XML file by element name or path and list each matching value and attribute.

XML Statistics

See element, attribute, text, depth, and repeated-name totals in one small report.

XML Text Extractor

List the text inside XML elements with a clear path showing where each line came from.

XML Tree Viewer

Turn nested XML into a simple indented outline with element names, attributes, and short text.

Developer Tools: IDs & Tokens

JWT Decoder & Inspector

Read JWT headers and claims, check expiry and issued times, and optionally verify HS256 signatures in your browser.

UUID Generator

Create one or hundreds of secure UUID v4 or time-sortable UUID v7 values, then validate and inspect any UUID.

Developer Tools: Time & Automation

Cron Expression Generator

Build or explain a standard five-part cron schedule, validate each field, and preview the next run times in your timezone.

Unix Timestamp Converter

Convert Unix seconds, milliseconds, microseconds, or nanoseconds to readable dates and turn any local date back into a timestamp.

Developer Tools: Test & Compare

Regular Expression Tester

Test JavaScript regular expressions live, highlight every match, inspect capture groups, and preview replacements.

Text Diff Checker

Compare text or code line by line, ignore unimportant spacing or case changes, and export a familiar unified diff.

Developer Tools: Diff & Patch

CSS Diff Checker

Compare two CSS files by selector, property, value, punctuation, and spacing in one clear view.

JSON Diff Checker

Compare two JSON files by value, even when their keys are in a different order, and see every added or removed part.

Patch Applier

Apply a unified patch to one text file and preview the finished file before you save it.

Patch Inspector

Inspect a unified or Git patch and count its files, hunks, added lines, and removed lines without changing anything.

Unified Patch Maker

Turn the old and new version of a text file into a standard unified patch for Git and other tools.

Word Diff Checker

Compare two paragraphs word by word and spot small edits that a line comparison can miss.

Developer Tools: Mock Data

Custom Fake Dataset Generator

Name your columns, pick simple fake field types, and create a repeatable JSON or CSV dataset.

Fake Address Generator

Create localized street addresses, cities, regions, postal codes, countries, and optional map coordinates.

Fake Appointment Dataset Generator

Create safe sample appointments with clients, services, staff, times, lengths, prices, and status.

Fake Book Metadata Generator

Create sample book titles, authors, genres, publishers, formats, series, ISBNs, and optional summaries.

Fake Company Generator

Create made-up company names, taglines, industries, websites, emails, and phone numbers.

Fake Contact List Generator

Build a sample contact list with names, emails, phone numbers, companies, and optional addresses.

Fake Food Menu Generator

Create sample dishes with descriptions, food styles, ingredients, spice notes, prices, and availability.

Fake Order Generator

Create nested test orders with customers, line items, quantities, totals, dates, and order status.

Fake Person Generator

Create realistic names, birthdays, jobs, and short bios for tests, demos, and practice projects.

Fake Product Catalog Generator

Create sample products with SKUs, names, departments, descriptions, materials, colours, and prices.

Fake Vehicle Dataset Generator

Create sample vehicles with makers, models, types, fuel, colours, and optional VIN and plate values.

Internet Test Data Generator

Create sample usernames, emails, domains, URLs, IP addresses, user agents, and optional passwords.

Localized Fake Data Sampler

Compare names, addresses, phone numbers, companies, and products from two language or country settings.

Mock API Response Generator

Create a realistic users, products, or orders API response with optional page details.

SQL Seed Data Generator

Create safe INSERT statements for sample users, products, or companies in PostgreSQL, MySQL, or SQLite.

Test Payment Data Generator

Create clearly fake card and bank fields for form tests. These values are not for real payments.

Developer Tools: Architecture & Documentation

Architecture Documentation Builder

Make a system architecture document with Mermaid diagrams and notes. Download one HTML guide or a bundle of diagrams.

Developer Tools: Build Templates

Customer Greeting Liquid Template Tester

Preview a greeting with names, customer tags, and a safe fallback.

Invoice Line Liquid Template Tester

Loop through invoice items and show quantity, price, and a simple line total.

JSON to Liquid Renderer

Paste any JSON object and render its fields through a bounded Liquid template.

Liquid Batch Preview Maker

Preview the same Liquid template for up to fifty records in a JSON customers array.