# DevToolLab

> DevToolLab (https://devtoollab.com) is a free library of 870 online developer tools and 218 hands-on guides and tool comparisons, written for working software developers in the United States. Most tools run entirely in the browser with no signup.

## About this site
- Tool pages describe what each tool does, its input and output formats, and its limits. Use the tool page as the source for tool behavior.
- Blog posts are dated. Comparison posts list vendor pricing and figures as published on the vendor's own pages on the date shown; check the "updated" date before quoting a number.
- Canonical URLs have no trailing slash. When citing, link the specific tool or article URL rather than the homepage.
- Contact and corrections: https://devtoollab.com/contact

## Popular tools
- [Text to JSON Converter](https://devtoollab.com/tools/text-to-json-converter): Text to JSON converter: turn a TXT file, plain-text lines or key: value pairs into a JSON array or object. Handles CSV and custom delimiters. Free, no upload.
- [JSON Schema Generator](https://devtoollab.com/tools/json-schema-generator): Generate JSON Schema from your JSON data automatically. Infer types, detect formats, and create valid schemas for validation.
- [Regex Tester & Validator](https://devtoollab.com/tools/regex-tester): Test regular expressions with real-time validation, match highlighting, and detailed explanations. Debug regex patterns quickly and efficiently.
- [Swagger Viewer Online](https://devtoollab.com/tools/swagger-viewer): Swagger viewer and OpenAPI explorer online. Load a spec from a URL or paste JSON/YAML, browse endpoints and schemas, and send live test calls. Free.
- [CSV Viewer Online](https://devtoollab.com/tools/csv-viewer): CSV viewer online: open a CSV from a URL, upload a file, or paste data, then search, sort, and filter it in a clean table. Shareable ?url= links, custom delimiters, large files.
- [HTML Live Editor & Preview Online](https://devtoollab.com/tools/html-live-editor): HTML playground with live preview and shareable links. Write HTML, CSS, and JavaScript, watch it auto-run, and share the code in a URL - no login, no setup, nothing stored.
- [HTML Decoder and Encoder](https://devtoollab.com/tools/html-encoder-decoder): HTML decoder and encoder for HTML entities. Decode escaped markup back to readable text, deobfuscate entity-encoded HTML, or encode text safely. Free.
- [HTTP Status Checker](https://devtoollab.com/tools/http-status-checker): Free URL status and HTTP response checker. See the status code, response headers, every 301/302 redirect hop and the response time for any link. No signup.
- [Website Down Checker](https://devtoollab.com/tools/website-down-checker): Check if a website is down for everyone or just you. Test website availability, status code, DNS resolution, and response time from an independent server.
- [Port Checker](https://devtoollab.com/tools/port-checker): Check if a specific port is open or closed on any host or IP address. Test TCP connectivity for common service ports like HTTP, SSH, MySQL, and more.
- [URL Tracker & Link Shortener](https://devtoollab.com/tools/url-tracker): Create short, trackable URLs with detailed click analytics. Track visitor location, devices, referrers, and more. Password protection & QR codes included.
- [UTM Link Builder](https://devtoollab.com/tools/utm-link-builder): Create UTM-tagged URLs for tracking marketing campaigns in Google Analytics. Build links with source, medium, campaign, term, and content parameters.
- [Robots.txt Generator](https://devtoollab.com/tools/robots-txt-generator): Create robots.txt files to control how search engine bots crawl your website. Allow or disallow specific agents and paths.
- [Robots.txt Tester](https://devtoollab.com/tools/robots-txt-tester): Test robots.txt rules to verify whether a specific URL path is allowed or blocked for Googlebot, Bingbot, or any custom user-agent.
- [Keyword Density Checker Online](https://devtoollab.com/tools/keyword-density-checker): Analyze keyword frequency and density percentages in your content. Filter by minimum word length, exclude stop words, and identify top repeated terms for better on-page SEO.
- [Favicon Generator Online](https://devtoollab.com/tools/favicon-generator): Generate favicons from text, emoji, or initials with custom colors and sizes. Download as ICO, PNG, or SVG for your website.
- [Email Validator Online](https://devtoollab.com/tools/email-validator): Validate email addresses instantly with format checking, domain verification, and common typo detection. Check single or bulk emails for deliverability.
- [Credit Card Validator](https://devtoollab.com/tools/credit-card-validator): Validate credit card numbers using the Luhn algorithm. Detect card types including Visa, Mastercard, American Express, Discover, and more.
- [MAC Address Lookup](https://devtoollab.com/tools/mac-address-lookup): Look up the manufacturer or vendor of any network device from its MAC address OUI prefix. Identifies device maker, unicast/multicast type, global/local scope, and randomised MAC detection for iOS and Android.
- [Passphrase Generator Online](https://devtoollab.com/tools/passphrase-generator): Generate strong, memorable passphrases using random words. Easier to remember than random passwords while being equally secure. Entropy estimation included.
- [Lua Deobfuscator Helper](https://devtoollab.com/tools/lua-deobfuscator-helper): Lua deobfuscator that makes obfuscated Lua readable in your browser: reindents code, decodes string.char calls and unescapes strings. Free, not a decompiler.
- [Color Picker from Screen](https://devtoollab.com/tools/screen-color-picker): Color picker from screen: click once to sample any pixel on your display, even outside the browser. Copy HEX, RGB or HSL and export a CSS palette. Free.
- [YouTube Thumbnail Downloader - Free HD Download](https://devtoollab.com/tools/youtube-thumbnail-downloader): Download any YouTube thumbnail in HD up to 1280x720, Shorts included. Paste a watch link, youtu.be link or video ID. Free, no signup, no watermark.

## Tool categories
- [Analyzers](https://devtoollab.com/tools/tags/analyzers)
- [Calculators](https://devtoollab.com/tools/tags/calculators)
- [Cleaners](https://devtoollab.com/tools/tags/cleaners)
- [Converters](https://devtoollab.com/tools/tags/converters)
- [Decoders](https://devtoollab.com/tools/tags/decoders)
- [Encoders](https://devtoollab.com/tools/tags/encoders)
- [Formatters](https://devtoollab.com/tools/tags/formatters)
- [Generators](https://devtoollab.com/tools/tags/generators)
- [Images](https://devtoollab.com/tools/tags/images)
- [Minifiers](https://devtoollab.com/tools/tags/minifiers)
- [Networking](https://devtoollab.com/tools/tags/networking)
- [Optimizers](https://devtoollab.com/tools/tags/optimizers)
- [SEO](https://devtoollab.com/tools/tags/seo)
- [Social Media](https://devtoollab.com/tools/tags/social-media)
- [Utilities](https://devtoollab.com/tools/tags/utilities)
- [Validators](https://devtoollab.com/tools/tags/validators)
- [Viewers](https://devtoollab.com/tools/tags/viewers)
- [All tools](https://devtoollab.com/tools)

## Most-read guides and comparisons
- [Developer Tools Pricing Index 2026](https://devtoollab.com/blog/developer-tools-pricing-index): 161 published prices for 76 products in 10 categories, each checked on September 26, 2026, with a free CSV. The same workload costs up to 36x more. (updated 2026-09-26)
- [Best AI Code Review Tools in 2026: Tested & Ranked](https://devtoollab.com/blog/ai-code-review-tools): The best AI code review tools in 2026 -- from PR-level reviewers like CodeRabbit to IDE security scanners like Snyk. Tested and ranked for solo devs, startups, and enterprise teams. (updated 2026-08-20)
- [Best Static Code Analysis Tools in 2026: Open Source Linters and SAST Tested](https://devtoollab.com/blog/best-static-code-analysis-tools): The best static code analysis tools in 2026, tested locally - from Oxlint's type-aware linting and Ruff's Rust-powered speed to Semgrep, Opengrep, Trivy, and SonarQube's quality gates. Open source first, with real versions and output. (updated 2026-08-05)
- [Best CLI AI Coding Agents in 2026: Claude Code, Codex, OpenCode, GitHub Copilot CLI & More](https://devtoollab.com/blog/top-cli-ai-coding-agents): The definitive 2026 ranking of CLI AI coding agents. Claude Code, Codex CLI, OpenCode, GitHub Copilot CLI, and Antigravity CLI - covering capabilities, pricing, model support, and which tool fits your workflow. (updated 2026-06-07)
- [AI Code Refactoring in 2026: Tools, Workflows, and What Actually Works](https://devtoollab.com/blog/ai-code-refactoring-tools): The definitive guide to AI code refactoring tools in 2026 - from Cursor and Claude Code to CodeScene ACE and Sourcery. Learn which tools handle multi-file refactors, which specialize in Python, and how to build a workflow that doesn't create more debt than it clears. (updated 2026-06-06)
- [Best AI-Powered Code Security Scanning Tools for Developers in 2026](https://devtoollab.com/blog/best-ai-code-security-tools): AI-generated code ships vulnerabilities 40% faster than hand-written code. This guide covers the top AI-powered security scanners -- Snyk, GitHub CodeQL, Aikido, and more -- with real pricing, AutoFix benchmarks, and CI setup examples. (updated 2026-06-11)
- [Best CodeRabbit Alternatives 2026: AI Code Review Tools Compared](https://devtoollab.com/blog/coderabbit-alternatives): CodeRabbit works for most teams -- but not all. Compare Greptile, Qodo Merge, Cursor BugBot, and GitHub Copilot Code Review with real pricing benchmarks. (updated 2026-10-06)
- [Best Offline LLM Models and Tools 2026](https://devtoollab.com/blog/top-5-local-llm-tools-models): Which offline LLM models actually run on your own hardware in 2026: Qwen3.8, Gemma 4, Phi-4 and Mistral Small, plus Ollama, LM Studio, Jan and LocalAI. (updated 2026-09-14)
- [Self-Host Open Source AI Image Generators](https://devtoollab.com/blog/open-source-ai-image-generators-self-host): Open source AI image generators you can self-host: Z-Image-Turbo, FLUX.2, Krea 2, Qwen-Image and more, with verified licenses and real VRAM numbers. (updated 2026-10-04)
- [Best Vector Databases in 2026: Tested & Ranked](https://devtoollab.com/blog/best-vector-databases): Qdrant raised $50M while Pinecone explored a sale. A developer's honest comparison of the top vector databases in 2026 - Pinecone, Weaviate, Qdrant, Milvus, and pgvector - with pricing, tradeoffs, and how to pick one. (updated 2026-07-24)
- [Best RAG Platforms & Tools in 2026: Frameworks vs Managed Services](https://devtoollab.com/blog/best-rag-platforms-and-tools): RAG runs 51% of enterprise LLM deployments versus 9% for fine-tuning. A developer's honest guide to the best RAG platforms and tools in 2026 - LlamaIndex, Haystack, DSPy, Bedrock, Vertex, and the managed services replacing DIY pipelines. (updated 2026-08-26)
- [Best LLM Gateways and API Routers in 2026](https://devtoollab.com/blog/best-llm-gateways): The best LLM gateways and API routers in 2026 compared: OpenRouter, LiteLLM, Portkey, and Cloudflare - real pricing, working code, and the 2026 acquisitions reshaping the market. (updated 2026-07-28)
- [Claude Prompt Caching Pricing in 2026](https://devtoollab.com/blog/prompt-caching-guide): Claude prompt caching pricing for Opus 5.5, Sonnet 5.5 and Haiku 5.5, OpenAI GPT-6 cache-write fees, Gemini storage, and the hit rate where caching pays off. (updated 2026-10-22)
- [11 Best Webhook.site Alternatives (2026)](https://devtoollab.com/blog/best-webhook-site-alternatives): Webhook.site free URLs expire in 7 days. DevToolLab, Smee.io, Beeceptor, Hookdeck, Svix Play, ngrok and self-hosted testers compared on free limits and price. (updated 2026-10-11)
- [11 Best Ngrok Alternatives for 2026](https://devtoollab.com/blog/best-ngrok-alternatives): Compare 11 Ngrok alternatives for local tunneling: Cloudflare Tunnel, Localtunnel, frp, bore, sish and more. Free tiers, licenses and self-hosted setups. (updated 2026-09-21)
- [Webhook vs API: What's the Difference?](https://devtoollab.com/blog/webhooks-vs-api): An API answers when you ask; a webhook calls your URL when an event happens. Cost, latency, security and failure handling compared, with runnable code. (updated 2026-09-27)
- [TCP vs UDP Explained: Key Differences, Use Cases & When to Use Each (2026)](https://devtoollab.com/blog/tcp-vs-udp): A complete guide to TCP vs UDP - understand how they differ, when to use each, how ping and ICMP work (no ports!), a full well-known ports reference, and a step-by-step port forwarding guide. (updated 2026-05-22)
- [5 Best Self-Hosted VPN Servers in 2026](https://devtoollab.com/blog/best-self-hosted-vpn): WireGuard, WG-Easy, Headscale, NetBird and AmneziaVPN compared on web UI, mesh, license and current version, with Docker setup for a homelab or a team. (updated 2026-10-04)
- [Turborepo vs Nx: Best Monorepo Tools 2026](https://devtoollab.com/blog/best-monorepo-management-tools): Turborepo vs Nx compared on caching, CI speed and pricing, with pnpm Workspaces, Lerna and Bazel, plus the setup that gets a monorepo running in 10 minutes. (updated 2026-09-23)
- [GitHub Actions Best Practices 2026: Security, Speed, and Reuse](https://devtoollab.com/blog/github-actions-best-practices): GitHub Actions best practices for 2026: reusable workflows, OIDC auth, SHA pinning, dependency caching, and concurrency controls - with working YAML examples. (updated 2026-06-19)
- [Container Security Tools Compared: Image Scanning, Runtime Defense, and Open-Source Picks](https://devtoollab.com/blog/container-security-tools): Container security splits into three jobs that no single tool does well. We tested Trivy, Grype, Falco, Tetragon and Kubescape against the paid platforms, with real scan output and current pricing. (updated 2026-09-02)
- [Best SOC 2 Compliance Automation Platforms in 2026: Vanta vs Drata vs Secureframe vs Sprinto](https://devtoollab.com/blog/best-soc2-compliance-automation-platforms): Vanta, Drata, Secureframe, Sprinto, Thoropass, Oneleet, Scytale and open-source Comp AI compared: what each publishes about pricing, who delivers the audit, and a script that checks your public SOC 2 evidence. (updated 2026-09-05)
- [uv in 2026: The Python Tool That Replaced pip, Poetry, pyenv, and virtualenv All at Once](https://devtoollab.com/blog/uv-python-package-manager): uv is 10-100x faster than pip and replaces pip, Poetry, pyenv, virtualenv, and pipx with a single Rust-based binary. Here is everything you need to know to switch today. (updated 2026-06-08)

## Latest articles
- [5 Devin Alternatives for Teams in 2026](https://devtoollab.com/blog/devin-alternatives): Factory, Codex, Copilot, Claude Code and OpenHands compared with Devin on where the agent runs, how long a task can go and what five seats cost. (updated 2026-10-25)
- [Discord File Size Limit: Fit Under 20 MB](https://devtoollab.com/blog/discord-file-size-limit): Discord's free upload limit is 20 MB per file since August 2026. The bitrate math and two-pass ffmpeg command that fit a 45-second 1080p clip under it. (updated 2026-10-25)
- [How to Migrate requirements.txt to uv](https://devtoollab.com/blog/migrate-requirements-txt-to-uv): Run uv init --bare, then uv add -r requirements.txt. Then fix what it drops: the PyTorch index (4.08 GB of CUDA wheels on Linux) and dev-file duplicates. (updated 2026-10-24)
- [Qwen3.8 27B VRAM Requirements, Measured](https://devtoollab.com/blog/qwen3-8-27b-vram-requirements): Qwen3.8 27B at Q4_K_M needs 23.74 GB of GPU memory for 128K tokens with a q8_0 cache. llama.cpp's own plan for 16, 24 and 32 GB GPUs. (updated 2026-10-24)
- [AWS Secrets Manager vs Parameter Store](https://devtoollab.com/blog/aws-secrets-manager-vs-parameter-store): Parameter Store SecureString or Secrets Manager for OpenAI and Anthropic keys on AWS: limits, rotation, Lambda caching, and the keyless STS option. (updated 2026-10-23)
- [AI Support Chatbot Cost: Buy vs Build](https://devtoollab.com/blog/customer-support-chatbot-cost): Intercom Fin, Zendesk AI agents and a custom GPT-5.4 Mini bot priced at 10,000 support chats a month, plus the volume where building your own pays off. (updated 2026-10-23)
- [Human-in-the-Loop AI Marketing Workflows](https://devtoollab.com/blog/human-in-the-loop-ai-marketing): AI marketing agents can research and draft alone, but anything public should wait for a person. A six-step approval workflow, review checklist and permissions. (updated 2026-10-23)
- [GDPR Compliant Employee Monitoring Tools](https://devtoollab.com/blog/gdpr-compliant-employee-monitoring-software): Apploye is the best GDPR compliant employee monitoring software for dev teams in 2026. Compare 6 tools on DPA, privacy controls, pricing, and developer fit. (updated 2026-10-22)
- [PHP2Shell: How to Check and Patch PHP](https://devtoollab.com/blog/php2shell-check-and-patch): PHP2Shell (CVE-2026-109618, CVE-2026-109619) is fixed in PHP 8.5.12, 8.4.27, 8.3.36 and 8.2.35. Check the PHP that runs, patch, restart and mitigate. (updated 2026-10-22)
- [AI Image Editor for Stale Doc Screenshots](https://devtoollab.com/blog/ai-image-editor-documentation-screenshots): Why documentation screenshots go stale, which ones to keep, how to redact keys and emails without blurring, and where an AI Image Editor speeds up a refresh. (updated 2026-10-21)
- [jq select: Filter JSON Arrays by Value](https://devtoollab.com/blog/jq-select-filter-json): Filter JSON with jq select(): match a field, combine and, or and IN, match substrings, export CSV, and fix the errors jq 1.7.1 and 1.8.2 print. (updated 2026-10-21)
- [AI Agent Memory Platforms Compared: Mem0, Zep, Letta, GoodMem and Open Source](https://devtoollab.com/blog/ai-agent-memory-platforms): Mem0, Zep, Letta and GoodMem compared on memory model, pricing, benchmarks and self-hosting, plus the Apache-2.0 and MIT options worth running yourself. (updated 2026-10-21)
- [Are Claude Code Mods Safe? We Checked 22](https://devtoollab.com/blog/claude-code-mods): Claude Code mods run unsandboxed with your permissions. claude plugin validate shows what one can do; 9 of 22 public mods reach files, programs or the network. (updated 2026-10-20)
- [Best HR Software for UK Enterprise (1000+)](https://devtoollab.com/blog/best-hr-software-uk-enterprise): Nine HR platforms ranked for UK companies past 1,000 employees, from HiBob to Workday, SAP SuccessFactors and Oracle, on scale, security and UK payroll. (updated 2026-10-19)
- [npm Supply Chain Attack Mitigation in 2026](https://devtoollab.com/blog/npm-supply-chain-attack-mitigation): Block dependency install scripts and add a one-day release-age gate. npm 12, npm 11, pnpm, Yarn and Bun settings, tested against the tensorlake worm. (updated 2026-10-19)
- [All articles](https://devtoollab.com/blog)

## Other directories
- [AI Tools directory](https://devtoollab.com/ai-tools): Profiles of AI products with pricing and categories.

## Optional
- [Full index of every tool and article](https://devtoollab.com/llms-full.txt)
- [About DevToolLab](https://devtoollab.com/about)
- [Privacy Policy](https://devtoollab.com/privacy)
- [Terms of Service](https://devtoollab.com/terms)