APIs Tools
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Deepgram API
Freemium
Deepgram provides a speech AI platform with APIs for speech-to-text transcription, text-to-speech synthesis, and audio intelligence. Its Nova-2 model delivers best-in-class transcription accuracy with sub-300ms latency for real-time streaming applications. Deepgram supports 100+ languages, speaker diarisation, custom vocabulary, and domain-specific models for medical and legal transcription. Used by Twilio, Spotify, and Natera for voice-enabled products requiring fast, accurate speech recognition at scale.
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AssemblyAI API
Freemium
AssemblyAI is a speech AI platform providing transcription, speaker detection, sentiment analysis, topic detection, PII redaction, and auto chapters from audio and video files via API. Its LeMUR feature uses LLMs to answer questions, summarise, and generate action items from transcripts. AssemblyAI handles async and real-time streaming transcription with high accuracy across accents and audio conditions. Used by meeting tools, podcast platforms, and call analytics companies for production audio intelligence.
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Together AI API
Freemium
Together AI's inference API provides access to 100+ open-source models including Llama 3, Mistral, Qwen, and DBRX with speeds up to 400 tokens per second and competitive pricing. It supports chat completions, embeddings, and image generation with an OpenAI-compatible API format for easy migration. Together's fine-tuning API enables custom model training on proprietary datasets with LoRA and full fine-tuning options. Popular as a cost-effective alternative to proprietary APIs for open-source model inference.
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Tavily API
Freemium
Tavily is a search API purpose-built for AI agents and RAG applications that returns clean, relevant web content optimised for LLM consumption. Unlike standard search APIs that return raw HTML and links, Tavily returns structured, clean text excerpts from the most relevant sources for any query. It handles search result filtering, content extraction, and relevance ranking automatically. Used extensively as the default search tool in LangChain, LlamaIndex, and CrewAI agent frameworks for giving agents real-time web access.
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Serper API
Freemium
Serper is a fast, affordable Google Search API that provides real-time search results including organic results, knowledge graph, images, news, and places data via a simple REST interface. At a fraction of the cost of official Google APIs, Serper is widely used by AI developers to give LLM agents access to current web information. Supports 50+ countries and languages. Popular in LangChain, AutoGPT, and custom AI agent stacks as a reliable, low-latency source of real-time web search data.
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fal.ai
Freemium
fal.ai is a high-performance inference API platform for generative AI models specialising in image and video generation with extremely fast inference times. It runs FLUX, Stable Diffusion, video generation, and other media models on optimised GPU infrastructure delivering results in 1-3 seconds. The queue-based API handles bursts of requests without rate limiting. Used by creative applications, design tools, and developers who need reliable, fast image generation API access without managing model infrastructure.
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APIdog
Freemium
APIdog is a comprehensive API development platform that combines API design, debugging, testing, and documentation into a single unified tool. It supports REST, GraphQL, WebSocket, and gRPC protocols, making it a versatile choice for modern API workflows. Teams can collaborate in real time, auto-generate mock servers, and export to OpenAPI or Postman formats with zero friction.
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Treblle
Freemium
Treblle is an AI-powered API observability and documentation platform that automatically captures, monitors, and documents every API request in real time. It provides intelligent error detection, performance insights, and auto-generated OpenAPI documentation without any code changes. Perfect for teams that need instant visibility into their API health and usage patterns across all environments.
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Zuplo
Freemium
Zuplo is a developer-first API gateway that brings enterprise-grade features like rate limiting, authentication, and monetization to any API in minutes. It uses a code-first configuration approach, integrates with GitHub for GitOps workflows, and deploys globally at the edge. Zuplo is ideal for startups and enterprises alike that need fast, scalable API management without vendor lock-in.
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Speakeasy
Freemium
Speakeasy automates the creation of production-ready SDKs from OpenAPI specifications across multiple programming languages including Python, TypeScript, Go, Java, and Ruby. It ensures the generated SDKs are idiomatic, well-documented, and stay in sync with API changes automatically. DevOps and platform engineering teams use Speakeasy to eliminate the manual burden of maintaining client libraries at scale.
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Scalar
Free
Scalar is a modern API documentation tool that renders beautiful, interactive API references from OpenAPI or Swagger specs. It provides a clean developer experience with live request testing, code samples in multiple languages, and easy embedding into any website or app. Scalar is open source and designed to replace outdated Swagger UI with a significantly more polished and functional interface.
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Hoppscotch
Free
Hoppscotch is a lightweight, open-source API development ecosystem that runs entirely in the browser with no installation required. It supports REST, GraphQL, WebSocket, SSE, and MQTT protocols and provides a clean, fast interface for building and testing API requests. Teams choose Hoppscotch as a privacy-friendly, self-hostable alternative to Postman with a significantly lighter footprint and an active open-source community.
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