APIs Tools
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Apipheny
Freemium
Apipheny is a Google Sheets add-on that enables users to connect any API directly to their spreadsheet without writing code. It supports GET and POST requests, custom headers, authentication tokens, and automatic data refresh on a schedule. Business analysts, marketers, and non-developers use Apipheny to pull live data from APIs like Shopify, Google Analytics, or any REST endpoint directly into Google Sheets for reporting and analysis.
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Kong Gateway
Freemium
Kong Gateway is the most widely adopted open-source API gateway that provides traffic control, authentication, rate limiting, logging, and plugin-based extensibility for microservices and API architectures. It supports hybrid and multi-cloud deployments and offers a rich ecosystem of plugins for security, observability, and transformation. Platform and DevOps engineers at enterprises use Kong to manage, secure, and observe API traffic at massive scale across distributed systems.
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Mockoon
Free
Mockoon is a free, open-source API mocking tool that allows developers to create realistic mock REST APIs locally in seconds without any backend infrastructure. It supports dynamic responses, templating, request rules, proxy mode, and CLI integration for automated testing pipelines. Frontend developers and QA engineers use Mockoon to work independently of backend teams, simulate edge cases, and run integration tests without hitting production APIs.
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Insomnia
Freemium
Insomnia is an open-source REST and GraphQL API client that provides a clean, powerful interface for designing, debugging, and testing APIs with support for authentication flows, environment variables, and code generation. It offers a plugin ecosystem for extending functionality and supports collaborative workspaces for sharing API collections across teams. Developers choose Insomnia for its intuitive interface, native Git sync, and strong GraphQL support that makes it a compelling alternative to heavier API platforms.
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Swagger UI
Free
Swagger UI is the most widely used open-source tool for visualizing and interacting with API documentation generated from OpenAPI specifications, allowing developers and consumers to explore and test API endpoints directly from the browser without any additional tooling. It renders OpenAPI JSON or YAML into an interactive, human-readable interface with live request execution capabilities. Engineering teams embed Swagger UI into their developer portals to provide self-service API exploration and reduce onboarding time for new API consumers.
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Amadeus API
Freemium
Amadeus for Developers provides a comprehensive suite of travel APIs covering flight search, hotel booking, airport information, points of interest, and trip planning capabilities built on the same data powering the global travel industry. It offers sandbox and production environments with generous free tier access for startups and indie developers building travel applications. Travel tech companies and developers building flight booking engines, trip planners, and travel recommendation apps use Amadeus APIs to access authoritative global travel data without building proprietary data pipelines.
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Abstract API
Freemium
Abstract API is a collection of utility APIs covering email validation, IP geolocation, phone validation, VAT calculation, holidays, exchange rates, and more, all accessible through a single unified developer account and consistent API design pattern. Each API is designed to be production-ready with high availability, global infrastructure, and straightforward pricing based on monthly request volume. Full-stack developers and SaaS builders use Abstract API to add utility features to their applications quickly without building and maintaining custom data integrations.
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Supabase API
Freemium
Supabase is an open-source Firebase alternative that auto-generates RESTful and GraphQL APIs directly from PostgreSQL database schemas, enabling developers to build backends without writing boilerplate API code. It includes built-in authentication, real-time subscriptions, storage, and edge functions alongside the auto-generated API layer. Developers building web and mobile applications use Supabase to go from database schema to production-ready API in minutes, significantly accelerating backend development without sacrificing flexibility or control.
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Apigee
Paid
Apigee is Google Cloud's enterprise API management platform that provides full lifecycle API management including design, security, analytics, monetization, and developer portal capabilities for organizations managing large API programs. It supports hybrid and multi-cloud deployments and provides advanced traffic management, threat protection, and OAuth security out of the box. Large enterprises and API-first companies use Apigee to operationalize their API strategies at scale with enterprise-grade governance, observability, and developer experience tooling.
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Hookdeck
Freemium
Hookdeck is a webhook infrastructure platform that provides reliable webhook ingestion, delivery, monitoring, and debugging for engineering teams building event-driven applications. It handles retries, rate limiting, filtering, and fanout automatically, ensuring webhooks are never lost even when downstream services are unavailable. Backend engineers and platform teams use Hookdeck to eliminate the operational complexity of building resilient webhook handling infrastructure from scratch and gain full observability into webhook delivery across all their integrations.
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Lob
Freemium
Lob is an API platform that enables developers to programmatically send physical mail including postcards, letters, and checks at scale through a simple REST API integrated with address verification and print-and-mail fulfillment infrastructure. It handles address standardization, NCOA address changes, and delivery tracking automatically, making physical mail as programmable as email. Marketing teams, fintech companies, and operations teams use Lob to automate direct mail campaigns, send compliance notices, and disburse checks without managing print vendor relationships or physical fulfillment operations.
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Novu
Freemium
Novu is an open-source notification infrastructure platform that provides a unified API for sending notifications across email, SMS, push, in-app, chat, and webhook channels with a visual workflow editor for managing complex notification logic. It handles provider failover, user preferences, and delivery tracking centrally, eliminating the need to integrate and maintain multiple notification provider SDKs separately. Product and engineering teams use Novu to build sophisticated notification systems with multi-channel orchestration and user preference management without building custom notification infrastructure.
⭐ Top 10 Best APIs Tools
See our curated list of the highest-rated APIs tools
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