Free tier

UptimeRobot

UptimeRobot is an uptime monitoring service that checks websites, APIs, servers, and other endpoints to help teams detect outages and performance issues quickly. It provides real-time alerts, public s...

UptimeToolbox

UptimeToolbox is a website monitoring and status page service for Linux servers and web applications. It supports monitor checks, SSL certificate monitoring, domain expiration checks, alert delivery b...

UserCheck

UserCheck is an email validation API that checks addresses and domains for disposable mail providers, forwarding services, public email domains, role accounts, MX record validity, syntax errors, and c...

Userforge

Userforge is a web-based user persona creator that also supports user story writing and journey mapping in a shared workspace. It generates AI-assisted first drafts from an organisation summary, then ...

UseWebhook.com

UseWebhook.com is a browser-based webhook inbox that provides a unique URL for receiving test requests without running a server. Incoming requests can be inspected in the inbox, diffed, forwarded to localhost through the UseWebhook CLI, or replayed from request history.

UXPin

UXPin is a web-based UX/UI design and prototyping tool that lets teams build interactive prototypes with real interactions, states, variables, conditional logic, and component-driven layouts. It suppo...

UXtweak

UXtweak is a UX research platform that supports moderated and unmoderated studies, participant recruitment, analysis, and reporting in one web application. It includes tools for card sorting, tree tes...

v0 by Vercel

v0 by Vercel is a web application builder that generates apps, websites, and UI components from prompts. It supports visual editing, GitHub sync, one-click deployment to Vercel, and integration with external tools and APIs.

Vaadin

Vaadin is an open-source web framework for building enterprise web applications in Java. It provides server-side UI development with a unified Java stack, allowing developers to build backend logic and user interfaces in the same language without HTML or JavaScript for most application code.

Vatcheckapi.com

Vatcheckapi.com provides a REST API for validating and looking up EU VAT numbers. The API accepts a VAT number such as LU26375245 and returns validation status plus company details including country code, VAT number, request date, name, address, and success flags.

Vatlayer API

Vatlayer API is a JSON over HTTPS service for validating EU VAT numbers, returning company details, and looking up VAT rates by country code or IP address. The landing page shows endpoints for VAT number validation, VAT rate lookup, and VAT-compliant price calculation.

Vercel is a cloud platform for building, deploying, and scaling modern web applications. It combines developer tooling, global infrastructure, and built-in performance and security capabilities to help teams ship faster and deliver reliable user experiences.

Verifalia

Verifalia is an email verification API that checks addresses in real time and in batch through an HTTPS REST API that uses JSON. It supports integration into web forms, apps, CRMs, POS systems, and other data-entry points, and it provides SDKs for .NET, Java, JavaScript, Ruby, PHP, and Go.

Verimail is an email address verification service that checks bulk lists and individual addresses through a REST API. It removes syntax errors, duplicates, invalid domains, disposable addresses, catch...

Veriphone

Veriphone is a phone number validation and carrier lookup API that checks whether a number is valid, identifies its country, and returns carrier and line-type data. It supports single-number lookups through an instant API as well as bulk CSV validation for large lists.

Versionfeeds

Versionfeeds is a web service that generates custom RSS feeds for software release tracking. Users can create feeds with a custom title and description, or import dependencies from a composer.json or ...

Versoly

Versoly is a website builder for landing pages and CMS-driven sites. It provides a visual editor for designing pages, a built-in code editor for importing, editing, and exporting HTML and Tailwind CSS, and hosting on Versoly subdomains or custom domains depending on plan.

Vidhook

Vidhook is a survey and feedback collection tool that uses tag-based forms and widgets to gather structured responses. Respondents select tags to express opinions, and the system aggregates those tags across responses to show overall results.

Virgil Security

Virgil Security provides developer-facing cryptography toolkits and hosted security services for protecting data in transit and at rest. The product line includes E3Kit for end-to-end encrypted commun...

Visual Debug

Visual Debug is a browser-extension-based feedback collection tool for web projects. It lets users capture and share feedback from a browser session, then sync that feedback with project management and collaboration tools such as Jira, Asana, ClickUp, Slack, GitHub, Teams, and Monday.

Visual Studio Community

Visual Studio Community is a free, fully featured IDE from Microsoft for building applications on Windows, web, mobile, and cloud platforms. It includes code editing, debugging, profiling, Git integra...

Voice Clone

Voice Clone is a browser-based voice cloning and text-to-speech product that records or uploads a voice sample, analyzes the speaker’s characteristics, and generates speech from typed text in the clon...

LogMeIn Hamachi is a hosted VPN service for creating virtual private networks on demand. It extends LAN-like connectivity over the web so distributed teams, mobile workers, and remote computers can communicate through encrypted tunnels without modifying firewalls or network routers.

Wachete

Wachete is a web page monitoring and change detection service that checks a URL on a schedule and notifies users when the page content changes. It supports email alerts, phone notifications, and chat integrations such as Slack, Teams, Discord, and Telegram.

WaiverCat

WaiverCat is a digital waiver platform for collecting signatures on PDF documents and other waiver forms. It provides an annotation tool to convert a PDF into an electronic waiver that can be signed, ...

WakaTime

WakaTime is a coding analytics service that tracks developer activity in editors, IDEs, and terminals through plugins and a desktop app. It measures coding time, project activity, AI-generated code, m...

Warp

Warp is an agentic development environment that combines a modern terminal, AI coding agents, and collaborative workspace features in a single cross-platform product.

WeatherXu

WeatherXu is a JSON-based REST API for real-time weather data, forecasts, historical weather, and alerts. The landing page shows a single endpoint pattern for location-based requests and example responses for current, hourly, and daily weather data.

Web Scraper

Web Scraper is a browser-based web scraping platform that helps users extract data from websites without coding. It combines a point-and-click extension with cloud automation tools so teams can build scrapers, handle dynamic pages, and export structured data for downstream use.

Web3Forms

Web3Forms is a contact form backend API for static and client-side websites. It accepts HTML form submissions at https://api.web3forms.com/submit and forwards them to an email inbox, so developers can collect form data without running server-side code.

WebComponents.dev is an online IDE for building Web Components in the browser. It provides starter templates for multiple component frameworks and languages, then lets developers push code to Git and publish packages to npm from the studio environment.

Webex is a cloud collaboration platform that combines meetings, calling, messaging, webinars, events, whiteboarding, polling, and video messaging in one service. The pricing page lists a free plan wit...

Webflow

Webflow is an AI-native website experience platform that enables teams to design, build, manage, and optimize custom websites in one visual environment. It combines a visual builder with CMS, hosting,...

Webhook Relay is a webhook forwarding service that routes incoming webhooks to one or more public destinations, or tunnels them to private internal endpoints through a local agent. It supports forward...

Webhook.site

Webhook.site generates unique URLs, email addresses, and DNSHook endpoints for receiving inbound web requests and emails. It exposes each request in a browser-based inbox with request details, headers, body content, files, and replay or redirect actions.

Webpushr

Webpushr is a web push notifications platform that lets websites send browser push messages through a dashboard, REST API, or WordPress plugin. The service supports subscriber targeting by segments an...

WebScraping.AI is a web scraping API that accepts a URL and returns rendered HTML, plain text, or AI-extracted structured JSON data. The service handles proxy rotation, browser rendering, CAPTCHA hand...

Website Screenshot API

Abstract's Website Screenshot API converts a URL or raw HTML into a high-quality image through a simple REST interface. It is designed for developers who need reliable page capture for previews, monitoring, QA, and workflow automation.

WebSitePulse

WebSitePulse provides a set of free web, DNS, email, and network test tools that run checks against a supplied URL, hostname, IP address, or email domain. The tools verify availability, response time,...

Webstudio

Webstudio is a website builder that lets users create and publish sites through a visual editor, MCP-based agent workflows, and optional AI-assisted design. It supports exporting projects for self-hos...

What The Diff

What The Diff is an AI-assisted pull request review tool that reads GitHub or GitLab diffs through the provider API and generates plain-English PR descriptions, summary notifications, weekly progress ...

Whimsical

Whimsical is a web-based whiteboard and diagramming product for technical teams. It provides boards for infinite-canvas work, diagrams, flowcharts, mind maps, and wireframes, with real-time multiplayer editing, comments, templates, image and video embeds, and version history.

Whitespace

Whitespace is a browser extension and web service for capturing bug reports with one click. It records page activity such as video playback, logs, network requests, navigations, user actions, and storage changes, then shares the recording as a link.

Wikifactory

Wikifactory is a web platform for exploring open engineering projects and related documentation. The landing page describes access to more than 20,000 projects, CAD files, project documentation, articles, topics, and research resources, with links to view projects and browse community content.

Windmill

Windmill is a code-first orchestration platform for internal software. It combines scripts, workflows, internal apps, data pipelines, scheduled tasks, and AI agents in one workspace, with Git-based collaboration and self-hosting options.

Windsurf

Windsurf is an AI-assisted code editor and IDE from Cognition AI. It combines the Windsurf Editor, Cascade local agent sessions, and Devin cloud agent sessions for coding, refactoring, lint fixing, previews, and task delegation inside the editor and JetBrains plugin.

Wistia is a video marketing platform that combines video hosting, embedding, player customization, webinar hosting, recording, editing, and analytics in one hosted service. The pricing page lists a Fr...

WorkOS

WorkOS is an enterprise identity and access platform that provides APIs for adding single sign-on, directory sync, user management, audit logs, role-based access control, bot blocking, and related authentication features to applications.

wormhol.org

wormhol.org is a file-sharing service that lets users upload files through drag-and-drop or file browsing and generate shareable access for multiple recipients.

Wormhole

Wormhole is a file sharing service that sends files through an end-to-end encrypted browser workflow. Users select files or drag and drop them, then receive a link that automatically expires after delivery.

WPJack

WPJack is a WordPress control panel for provisioning and managing WordPress servers on supported cloud providers, including DigitalOcean, Linode, Hetzner, and Vultr. It creates servers with Nginx, a d...

WrapAPI

WrapAPI is a web API builder that captures browser requests and page actions, then turns them into reusable API endpoints. It includes a Chrome extension for recording requests, an API Builder for selecting outputs from HTML, JSON, and XML, and publishing tools for sharing APIs with other users.

WrapPixel

WrapPixel provides pre-coded website templates, admin dashboard templates, and UI kits for developers and agencies. The catalog spans Bootstrap, React, Angular, Vue, Next.js, Nuxt.js, Tailwind, Astro, Framer, Vercel, and Shadcn-based templates, with live previews and downloadable source code.

Wraps

Wraps is an open-source email infrastructure platform that provisions Amazon SES, DynamoDB, Lambda, EventBridge, and scoped IAM roles into a user's AWS account with one command. It provides a TypeScri...

wsrv.nl is an image service for on-the-fly image resizing and transformation. It caches and serves processed images through a worldwide CDN, using nginx and libvips for image processing.

Wufoo

Wufoo is a cloud-based online form builder that lets users create registration forms, application forms, surveys, contact forms, and payment forms. Forms are hosted on Wufoo’s servers and can be embed...

Xata

Xata is a hosted PostgreSQL platform that provides instant database branching, copy-on-write cloning, scale-to-zero compute, and built-in anonymization for production and development workflows. It sup...

xCloud

xCloud is a managed hosting and server management platform for WordPress, Laravel, PHP, Node.js, n8n, and related cloud workloads. It provides a control panel for deploying applications, managing serv...

Xirsys

Xirsys is an SDK-agnostic WebRTC connectivity API for NAT traversal and TURN/STUN relay services. It provides ICE server configuration, TURN servers in 12 production regions, user-geo routing, API-issued temporary credentials, and static non-expiring TURN credentials.

YepCode

YepCode is a developer-first platform for building, running, and scaling integrations and automations in Node.js or Python. It executes code in isolated cloud sandboxes with support for secrets, dependencies, logs, audit trails, webhooks, schedules, cron jobs, REST API access, and MCP tool exposure.