92+ browser-based utilities

All QA & DevOps utilities in one place

No install, no data stored, no sign-up. Search, open, and use the tool you need without breaking your current debugging flow.

How it works

Step 1

Pick a workflow or search for the exact tool name, tag, or category.

Step 2

Paste your input and configure only the options you need for that task.

Step 3

Review results instantly in the page, then copy or share the output.

Step 4

Return to pinned or recent tools later without rebuilding your workflow from scratch.

92+

tools

100%

browser-based

payloads stored

free

to use

Search and filter tools

Filter the grid below or jump into a workflow directly.

Suggestions

Try JSON formatting right here

Input

Formatted output

{
  "service": "orders",
  "status": "ok",
  "latencyMs": 182
}

Workflow suggestions

Debug API payloads

Use JSON Utilities, API Request Builder, and API Response Comparator together when requests or contracts drift.

Validate selectors and checks

Move from XPath / CSS testing into assertion generation when you need stable UI automation coverage.

Resolve config issues faster

Pair YAML, Docker, Kubernetes, and CI tools when pipeline or deployment config needs fast feedback.

Browse by workflow

Click a category to filter the grid, or use search above to narrow down the tools you need right now.

Showing 92 tools

API Testing

Request building, schema checks, payload comparison, mocks, and response debugging.

20 tools

Most Used

Most used

API Request Builder

Build and send HTTP requests with headers, params, auth, and body directly in the browser.

APIrequest

Open Tool

API Contract Tester

Validate OpenAPI contracts and catch missing request or response definitions before release.

APIcontract

Open Tool

API Mock Server Generator

Draft mock endpoint shapes from schemas so teams can stand up test doubles faster.

APImock

Open Tool

API Response Comparator

Compare two API payloads and inspect added, removed, and changed values side by side.

API Scenario Builder

Chain API requests with shared variables, assertions, and step-by-step execution logs.

APIscenario

Open Tool

cURL Converter

Convert curl commands into client snippets for debugging, docs, and test setup.

APIcurl

Open Tool

cURL / RestAssured Converter

Convert curl commands into RestAssured snippets and back for API automation workflows.

APIcurl

Open Tool

Popular

GraphQL Playground

Run GraphQL queries with variables, headers, schema introspection, and local history.

APIgraphql

Open Tool

GraphQL Query Tester

Compose and validate GraphQL queries with variables when you need a lightweight runner.

APIgraphql

Open Tool

Header Builder

Compose reusable HTTP header sets for auth, tracing, and custom API requests.

APIheader

Open Tool

New

HTTP Status Code Reference

Search HTTP codes with descriptions, common causes, typical fixes, and framework behavior.

APIhttp

Open Tool

Trending

Dynamic Mock Server

Create configurable mock APIs with conditional responses and live request logs.

APImock

Open Tool

OpenAPI / Swagger Viewer

Preview and navigate OpenAPI or Swagger definitions quickly when you just need a fast reader.

APIopenapi

Open Tool

Popular

OpenAPI / Swagger Visualizer

Parse OpenAPI specs and explore grouped endpoints, parameters, and schemas visually.

APIopenapi

Open Tool

Popular

Postman Collection Importer

Import Postman collections, run requests locally, and export them as curl commands.

APIpostman

Open Tool

Trending

Request Inspector

Generate a temporary endpoint and capture incoming requests with headers, query, and body.

APIrequest

Open Tool

New

Webhook Payload Builder

Edit GitHub, Stripe, Slack, Jira, and PagerDuty webhook payload templates locally.

APIwebhook

Open Tool

HTTP Header Analyser

Parse raw response headers into readable security, caching, content, and CORS insights.

APIhttp

Open Tool

UI & QA

Selector checks, assertion helpers, test authoring, and browser-side validation workflows.

12 tools

Assertion Generator

Generate assertion snippets from API responses to speed up automated test authoring.

QAassertion

Open Tool

Bug Report Helper

Build structured bug reports with repro steps, environment notes, and expected versus actual output.

QAreport

Open Tool

JSON Test Case Generator

Generate QA-ready test scenarios from JSON payload structure and field combinations.

Regex Utility

Test, debug, and validate regular expressions against sample text in real time.

QAutility

Open Tool

Resume Skill Analyzer

Extract QA and DevOps skill signals from resume text for fast screening and review.

QAresume

Open Tool

Screen Size / Breakpoints

Check viewport dimensions and active Tailwind-style breakpoints for responsive testing.

QAscreen

Open Tool

New

Test Case Generator from OpenAPI

Generate deterministic happy-path, auth, boundary, and validation cases from OpenAPI specs.

XPath / CSS Selector Tester

Evaluate XPath and CSS selectors against HTML snippets and inspect matched nodes quickly.

QAxpath

Open Tool

Accessibility Checker

Run axe-core checks against pasted HTML and review WCAG violations without leaving the browser.

QAaccessibility

Open Tool

Colour Contrast Checker

Check WCAG contrast ratios for text and UI colours, then generate passing alternatives.

Accessibilitycontrast

Open Tool

Test Coverage Heatmap

Parse LCOV, Istanbul, Cobertura, and Go coverage reports into a browsable file heatmap.

QAcoverage

Open Tool

Meta Tag Previewer

Preview titles, descriptions, Open Graph tags, and Twitter cards across search and social surfaces.

SEOmeta

Open Tool

Performance & Reliability

Latency analysis, concurrency simulation, SLA validation, and load-testing support.

5 tools

Concurrency Simulator

Estimate concurrency pressure, utilization, and bottleneck risk from traffic and response-time inputs.

Performanceconcurrency

Open Tool

HAR File Analyzer

Analyze HAR files for latency, failures, domains, and request hotspots in one pass.

Load Test Result Analyzer

Analyze JMeter CSV and k6 JSON results for latency, throughput, and error patterns.

Response Time Percentile Calculator

Calculate latency percentiles from raw timings or CSV data for performance reviews.

SLA Calculator

Translate uptime targets into practical downtime budgets for SLO and reliability reviews.

Performancecalculator

Open Tool

DevOps / CI-CD

YAML validation, pipeline generation, config review, and infrastructure helper tools.

12 tools

CI/CD Pipeline Visualizer

Parse pipeline definitions and visualize stages, jobs, and dependencies before merging changes.

DevOpscicd

Open Tool

Cron Expression Generator

Build and validate cron schedules with human-readable summaries for jobs and pipelines.

DevOpscron

Open Tool

Dockerfile Generator

Generate optimized Dockerfiles with multistage build and health-check options.

DevOpsdockerfile

Open Tool

Environment Utility

Inspect and format .env-style variables locally before sharing or injecting them into workflows.

DevOpsenvironment

Open Tool

New

Environment Variable Manager

Create named environments locally and inject active values into request-building tools.

DevOpsmanager

Open Tool

Git Conflict Visual Resolver

Resolve merge conflicts block by block and export a clean merged file without leaving the browser.

DevOpsconflict

Open Tool

Git Helper

Generate practical Git command sequences for branching, rebasing, recovery, and releases.

DevOpshelper

Open Tool

GitHub Actions YAML Generator

Generate CI workflow YAML for common language stacks and deployment steps.

DevOpsgithub

Open Tool

Kubernetes YAML Validator + Linter

Validate Kubernetes manifests, flag deprecated APIs, and catch lint or security issues.

YAML Validator

Validate YAML safely, surface syntax issues, and convert valid content into JSON.

DevOpsyaml

Open Tool

Docker Compose Validator

Validate docker-compose files for missing images, bad dependencies, and port conflicts.

DevOpsdocker

Open Tool

Incident Timeline Builder

Turn timestamped events into a clean incident chronology with detection and resolution metrics.

DevOpsincident

Open Tool

Utilities & Data

JSON, encoding, conversion, formatting, timestamps, and daily engineering utilities.

43 tools

Base64 / JWT Playground

Encode and decode Base64 strings while inspecting JWT claims, headers, and expiry values.

Securitybase64

Open Tool

Brotli Compressor / Decompressor

Compress or decompress text with Brotli to debug payload transport and fixture handling.

Encodingbrotli

Open Tool

Universal Converter

Convert JSON, YAML, XML, CSV, and plain text between common engineering formats.

Datauniversal

Open Tool

CSS Gradient Generator

Design linear and radial gradients, then copy CSS or Tailwind classes instantly.

CSSgradient

Open Tool

CSS Specificity Calculator

Calculate selector weight, compare competing selectors, and inspect exactly why one wins.

CSSspecificity

Open Tool

CSS Unit Converter

Convert px, rem, em, viewport, percent, and print units using realistic layout context values.

CSSunit

Open Tool

New

CSV / JSON Converter

Convert CSV to JSON and JSON arrays to CSV with delimiter detection and nested-data handling.

Datajson

Open Tool

Data Generator

Generate realistic names, emails, IDs, and fixture values for tests and mock payloads.

Datagenerator

Open Tool

Deflate Raw Utility

Compress or decompress raw deflate payloads for transport debugging and file inspection.

Gzip Utility

Compress or decompress text with Gzip to debug API payload handling and transport issues.

Encodingutility

Open Tool

Hash Generator

Generate MD5, SHA1, SHA256, and SHA512 hashes from text without leaving the browser.

Securityhash

Open Tool

Hex Encoder / Decoder

Convert plain text to hex and decode hexadecimal values back into readable strings.

Encodingencoder

Open Tool

HMAC Signature Generator

Generate and verify HMAC SHA256 and SHA512 signatures for webhook and auth flows.

Securityhmac

Open Tool

HTML Tools Toolkit

Format, minify, escape, preview, and validate HTML from one browser-based workspace.

Texthtml

Open Tool

JSON Diff Checker

Compare JSON payloads and detect added, removed, and changed fields for regression testing.

JSON Schema Validator

Validate JSON payloads against schemas and identify precise failing paths and types.

JSONschema

Open Tool

New

JSON to Code Generator

Generate typed models from JSON for TypeScript, Python, Java, Go, C#, Kotlin, and Rust.

JSON Utilities

Format, validate, diff, search, and query JSON payloads in one editor-first workspace.

JSONutilities

Open Tool

Client-side by default

KalpLabs standard utilities are built to keep common QA and DevOps work lightweight and local.

Browser-first workflow

No install

Open the page and start working immediately without desktop setup or account provisioning.

No payload storage

Most public utilities run browser-side so your working inputs stay local to the session.

Built for real workflows

Move between request building, payload inspection, config validation, and debugging in one place.