- Always freeUnboundedFTV 100
jsDelivr
jsDelivr is a free CDN for open source projects that serves JavaScript and ESM assets from npm and GitHub. It supports direct file URLs, version ranges, default entry points, directory listings, on-demand minification, source maps, and combining multiple files.
- Always freeUnboundedFTV 60

JSON Swiss
JSON Swiss is a browser-based JSON toolkit that combines formatting, validation, repair, visual table editing, conversion, schema generation, comparison, and code generation in one workflow. The forma...
- Free creditFTV 41
JSON2Video
JSON2Video is a video editing API that creates and renders videos from a JSON specification sent to a REST endpoint. It supports templates, variables, scene composition, AI voice-overs, subtitles, transitions, and AI-generated visuals, with MP4 output up to Full HD and 4K.
- Always freeUnboundedFTV 99

JSONing
JSONing is a developer tool that provides a mock API for testing and prototyping. It can generate a custom API from a JSON object, define resources such as products and users, and apply JSON-based rules to customize HTTP status codes, headers, and response bodies.
- Always freeUnboundedFTV 100
JSONPlaceholder
JSONPlaceholder is a free fake REST API for testing and prototyping. It serves common resources such as posts, comments, albums, photos, todos, and users over standard HTTP endpoints, and supports GET, POST, PUT, PATCH, and DELETE requests.
- Free tier$3.00 / moFTV 51
Julius
Julius is an AI-powered data analysis platform that helps individuals and teams explore, clean, transform, and analyze datasets using natural language and advanced reasoning. It combines AI agents wit...
- Free tierFTV 0
June
June is a product and customer analytics platform for B2B SaaS companies. It combines company-level analytics, product analytics, and customer data integrations with Salesforce, HubSpot, and Attio, plus SQL and AI-assisted custom insights, computed traits, alerts, and an embed API.
- Always freeUnboundedFTV 97
JustBlogged
JustBlogged is a hosted blogging platform that lets users create and publish a blog from a web interface in about 2 minutes. The service includes blog hosting, custom domains with free SSL, default themes, built-in SEO metadata, and an API for publishing and integrations.
- Free tier$2.00 / moFTV 49

KaiMail
KaiMail is a developer-focused email forwarding service for custom domains. It accepts mail through MX records, forwards messages to an existing inbox with ARC and DKIM signing, and can also deliver inbound mail as JSON payloads over HTTP webhooks.
- Free tier$2.00 / moFTV 47
Kanban Tool
Kanban Tool is a web-based Kanban board application for visual project management and team collaboration. It supports real-time board updates, task assignments, comments, email notifications, customizable workflows, swimlanes, card templates, and time tracking.
- Always free$3.00 / moFTV 44
KanbanFlow
KanbanFlow is a lean project management platform designed to help individuals and teams organize work visually and improve delivery flow. It combines a Kanban board with time tracking, reporting, and collaboration features in a single workspace.
- Free tier$8.00 / moFTV 44
Keploy
Keploy is an open-source testing platform that records real API traffic with eBPF and replays it in CI as deterministic regression tests, auto-generated mocks, and production-like sandboxes. It suppor...
- Free tier$75 / moFTV 63

Ketch
Ketch is a privacy management platform that provides cookie banners, consent management, DSR automation, data mapping, risk assessments, preference management, and data sentry features. The product co...
- Free tier$1.00 / moFTV 49
KillBait
KillBait is a news curation and submission service that evaluates submitted URLs through a public API and publishes selected items as news highlights. The API accepts a URL, language, and API key, the...
- Free tier$7.33 / moFTV 56
Killercoda
Killercoda is a browser-based platform for running interactive technical scenarios and playgrounds. The site offers free scenarios, course content, and certification-oriented labs, with separate paid ...
- Free tier$25 / moFTV 66
Kinde
Kinde is a developer platform for authentication, billing, access management, feature flags, and user management in SaaS applications. It provides hosted auth flows, SDKs for multiple languages and fr...
- Free credit$35 / moFTV 49

Kinsta
Kinsta is a managed WordPress hosting platform built on cloud infrastructure. It provides hosting for single sites, multiple WordPress installs, agency accounts, and enterprise deployments, with plans...
- Free tier$1.00 / moFTV 34
Kiro
Kiro is an agentic AI development environment that helps developers move from prototype to production with spec-driven workflows. It combines an IDE and CLI experience with structured requirements, architectural planning, task execution, and autonomous agents to support complex software delivery.
- Free trialFTV 17
Kit
Kit is an email marketing platform for creators that combines email sending, landing pages, forms, audience segmentation, visual automations, recommendations, and commerce features in one hosted servi...
- Free tier$20 / moFTV 53

Klaviyo
Klaviyo is a B2C CRM and marketing automation platform built to help brands unify customer data and activate it across email, SMS, WhatsApp, mobile push, and related channels. It combines messaging, a...
- Free tier$50 / moFTV 70
Knock
Knock is a customer engagement infrastructure platform for product, marketing, and transactional messaging. It provides workflows, broadcasts, guides, preferences, observability, and developer tooling for sending notifications across email, SMS, push, chat, and in-app channels.
- Free tier$1.00 / moFTV 50
kogiQA
kogiQA is a UI automation tool for web applications that uses natural-language selectors instead of CSS or XPath. The landing page shows examples such as click("New User") and type("Name", "Marc"), an...
- Free trialFTV 25
Kong Konnect
Kong Konnect is Kong’s unified API and AI connectivity platform for building, running, discovering, and governing modern digital traffic. It brings together API management, AI gateway capabilities, ev...
- Free tier$1.00 / moFTV 34
Koyeb
Koyeb is a high-performance cloud platform for deploying APIs, inference workloads, databases, and production applications without managing servers or infrastructure. It provides serverless containers...
- Free tier$1.00 / moFTV 50

Kraken.io
Kraken.io is an image optimization and compression service that processes JPG, PNG, WebP, GIF, SVG, AVIF, HEIC, and PDF files through a web interface and API. It supports lossy, lossless, and expert optimization modes, plus resizing, cropping, and format conversion.
- Free tier$3.00 / moFTV 53
Kreya
Kreya is a desktop API client for macOS, Windows, and Linux that supports gRPC, REST, GraphQL, WebSocket, and Server-Sent Events workflows from a single workspace. It includes request testing, snapshot comparisons, scripting, CLI automation, and Git-based project files for version control.
- Free tier$10 / moFTV 60
Kumu
Kumu is a relationship mapping platform for organizing complex data into interactive maps. It supports stakeholder mapping, systems mapping, social network mapping, community asset mapping, and concept mapping, with built-in presentation and publishing features for sharing maps online.
- Free tier$4.00 / moFTV 50
KwesForms
KwesForms is a form endpoint service for developers that accepts HTML form submissions, sends notification and autoresponder emails, and stores submission data for later management. The service works ...
- Free tier$2.00 / moFTV 45
LabEx
LabEx is an online learning platform for Linux, DevOps, cybersecurity, programming, and data science that uses interactive labs, skill trees, and real-world projects instead of video-based lessons.
- Free tier$10 / moFTV 60
LaunchDarkly
LaunchDarkly is a runtime control platform for feature flags, feature management, experimentation, and release governance. It helps teams ship software safely, target experiences to specific users or segments, and adjust behavior in production without redeploying code.
- Free tier$5.00 / moFTV 54
LeanCloud
LeanCloud is a serverless backend platform that provides database storage, server-side logic with LeanEngine, instant messaging, push notifications, SMS, and multiplayer game services. It supports nat...
- Free tier$5.90 / moFTV 56

Leapcell
Leapcell is a platform-as-a-service for deploying web applications, APIs, and background workloads in supported runtimes including TypeScript, Python, Go, and Rust. The service includes serverless com...
- Free tier$3.00 / moFTV 53

Leiga
Leiga is a project management platform for product, engineering, and delivery teams. It provides boards, tables, backlogs, roadmaps, releases, time tracking, dashboards, custom workflows, custom field...
- Always freeUnboundedFTV 90
Let's Encrypt
Let’s Encrypt is a certificate authority that issues free Domain Validation (DV) TLS certificates for websites and other domain-based services. It uses the ACME protocol and automated clients to let operators obtain, renew, and manage certificates without manual issuance.
- Free tier$45 / moFTV 56
Lightfeed
Lightfeed is a competitor intelligence platform for modern retailers and brands. It helps teams monitor pricing, promotions, assortment changes, product matching, and SEO signals across competitor retail chains and store locations.
- Free tier$3.00 / moFTV 42
lil'bots
lil'bots is a hosted platform for creating, deploying, and sharing AI-powered scripts and bots. It provides a web IDE with JavaScript and Python support, a Monaco-based editor, built-in API access to ...
- Free tier$3.00 / moFTV 39
Linear
Linear is a product development system designed for modern teams and AI-assisted workflows. It combines issue tracking, planning, agent-driven execution, code review, and progress monitoring in a single workspace so teams can move from intake to delivery with less friction.
- Free trial$21 / moFTV 46

LingoHub
LingoHub is a localization and translation management platform for managing multilingual content in one workspace. It supports translation workflows, translation memory, glossaries, style guides, qual...
- Free tier$8.00 / moFTV 56

Linkinize
Linkinize is a team bookmark manager delivered as a browser extension and web app. It lets users tag, search, import, and share bookmarks across workspaces, with support for browser extensions on Chrome, Firefox, Edge, Opera, and Brave.
- Free tier$5.00 / moFTV 56

linkok.com
linkok.com is a broken link checker that scans websites for link errors and reports results by email. It runs periodic scans, retries after temporary errors to reduce false positives, and provides a full report for review.
- Free tier$25 / moFTV 66
Liveblocks
Liveblocks is a realtime infrastructure platform for multiplayer apps and collaborative AI workflows. It provides hosted primitives for presence, broadcast events, synced storage, feeds, and threads, ...
- Free tier$25 / moFTV 54
loader.io
Loader.io is a cloud-based load testing service for web applications and API endpoints. It lets developers register a target host through the web interface or API, run tests that simulate concurrent connections, and monitor results in real time.
- Free tierFTV 63
Loadly.io
Loadly.io is a web-based app distribution platform for iOS and Android builds. It accepts APK and IPA uploads, then generates a distribution link or QR code so testers can download and install builds without using the App Store.
- Free tier$12 / moFTV 50

Localazy
Localazy is a software localization platform that manages source strings, translations, and delivery across apps, websites, CMS tools, and design files. It supports CLI, API, mobile SDKs, webhooks, tr...
- Always freeUnboundedFTV 90
LocalCert
LocalCert provides free .localcert.net subdomains for private networks that need certificates from public certificate authorities such as Let’s Encrypt. The service is used to avoid running a private certificate authority while still issuing publicly trusted TLS certificates for internal hosts.
- Always freeUnboundedFTV 99
localhost.direct
localhost.direct is a developer utility that provides a localhost domain with HTTPS support and wildcard subdomain handling. It lets local development work run natively on localhost.direct without extra configuration, with the exception of the reserved get.localhost.direct subdomain.
- Always freeUnboundedFTV 99
localhost.run
localhost.run is an SSH-based tunneling service that exposes a local web application to the internet through a remote tunnel endpoint. A developer can connect by running an SSH reverse tunnel command ...
- Free tier$1.19 / moFTV 48

Loco
Loco is a translation management system for developers that handles string management, translator collaboration, machine translation, and export of translation files for multi-language apps and websit...
- Free tierFTV 62
LogDog
LogDog is a mobile debugging tool for iOS and Android apps. It collects network requests, logs, analytics events, screenshots, and other app activity from an SDK installed in the application, then streams that data to a web dashboard over WebSocket connections.
- Free tier$3.00 / moFTV 41

Logflare
Logflare is a hosted logging and log analytics service for Cloudflare, Vercel, Elixir, and JavaScript applications. It ingests events from integrations such as Cloudflare Workers, OpenTelemetry, Elixi...
- Free tier$4.00 / moFTV 50

LoginLlama
LoginLlama is an API for login fraud detection that scores authentication attempts in real time before a user is authenticated. It accepts a login request, auto-detects IP address and user agent from ...
- Free tier$150 / moFTV 79
Logo.dev
Logo.dev provides a logo API for developers that returns company logos by domain, name, or ticker. The service is hosted on a CDN and exposes logos through image URLs and API endpoints, with options such as format, size, retina output, fallback monograms, dark mode, grayscale, and company search.
- Free trial$82 / moFTV 56

LogRocket
LogRocket is a session replay and product analytics platform that records user interactions in web and mobile apps, then combines replay data with logs, network activity, console output, errors, and p...
- Free tier$7.50 / moFTV 57
Logspot
Logspot is a real-time product and web analytics platform that collects events, pageviews, traffic sources, funnels, and user journey data from a website or application through a lightweight tag. It p...
- Free tier$12 / moFTV 60
Logto
Logto is an authentication and authorization platform for developers. It implements OIDC and OAuth 2.1 and adds sign-in flows, multi-tenancy, enterprise SSO, RBAC, MFA, organizations, machine-to-machine authentication, and account APIs for SaaS and AI applications.
- Free tier$6.00 / moFTV 56
Loom
Loom is an AI-powered video messaging platform that helps teams record, edit, and share screen and camera recordings quickly. It is designed to replace long meetings and dense written updates with concise videos that can be shared across work tools and embedded into everyday workflows.
- Free tier$3.00 / moFTV 54

Loops
Loops is an email platform built for product, marketing, and transactional messaging in one place. It helps teams send lifecycle emails, campaigns, and system-driven messages while keeping email design, audience data, and automation connected to the product.
- Free tier$42 / moFTV 70
Lost Pixel
Lost Pixel is an open-source visual regression testing platform for GitHub-based workflows. It compares screenshots from Storybook, Next.js, Playwright, and page-mode runs to detect UI changes before they reach users.
- Free tier$3.00 / moFTV 39

Lovable
Lovable is an AI app builder that helps teams create apps and websites by chatting with AI. Users can start from an idea, screenshots, or documents, then watch the product come to life in real time as the system generates a working prototype.
- Free tier$2.42 / moFTV 43
LuaDNS
LuaDNS is a managed DNS hosting service that provides an anycast network, DNSSEC, and a web control panel for editing DNS zones. It supports common record types including A, AAAA, ALIAS, CAA, CNAME, DS, FORWARD, HTTPS, MX, NS, OPENPGPKEY, PTR, REDIRECT, SOA, SPF, SRV, SSHFP, TLSA, and TXT.