Tool category
Model APIs
Hosted model APIs for product features and automation.
Use this category when a product or workflow needs LLM, multimodal, search, or voice capability behind an interface or automation pipeline.
Recommended tools
OpenAI APIGeneral-purpose model APIs for product builders.ClaudeLong-context assistant for writing, analysis, and coding workflows.GeminiGoogle model family for multimodal and workspace-aware AI.Vertex AIGoogle Cloud model and agent platform for enterprise AI applications.OpenRouterUnified API gateway for routing across hundreds of AI models.TavilySearch API designed for AI agents and research workflows.DeepgramVoice AI APIs for speech-to-text, text-to-speech, and voice agents.Azure AI SpeechEnterprise speech recognition, text-to-speech, translation, and voice intelligence.AssemblyAISpeech AI APIs for transcription, speech understanding, and voice agents.ElevenLabsVoice AI platform for narration, dubbing, and TTS products.LangChainAgent engineering framework and observability platform.LlamaIndexData and RAG framework for knowledge-heavy AI applications.VapiVoice agent platform for phone, web, and product voice workflows.ReplicateHosted model API for open image, video, audio, and ML models.Hugging FaceOpen model hub and AI infrastructure for builders.Mistral AIEuropean model platform for frontier models, agents, and enterprise AI.CohereEnterprise AI platform for Command, Embed, Rerank, and RAG systems.ExaAI search API for grounded agents and research workflows.PineconeManaged vector database for RAG, semantic search, and AI assistants.WeaviateAI-native vector database with free cloud and deployment flexibility.Google AI StudioFast Gemini prototyping surface for prompts, models, and API keys.GroqCloudFast low-cost inference platform for latency-sensitive AI products.Together AIAI-native cloud for open-source model inference, fine-tuning, and GPU infrastructure.QdrantVector database and search engine for RAG, recommendation, and AI agents.HaystackOpen-source framework for production RAG, search, question answering, and agent pipelines.ChromaOpen-source embedding database and cloud option for AI applications.MilvusOpen-source vector database for large-scale similarity search and RAG systems.LiteLLMOpenAI-compatible LLM gateway, proxy, routing, budgets, and provider abstraction.DSPyProgramming framework for optimizing language model pipelines instead of hand-tuning prompts.HeliconeAI gateway and LLM observability for routing, debugging, and analyzing AI apps.PortkeyProduction AI gateway, observability, guardrails, governance, and prompt management.LangSmithLangChain observability, tracing, evaluation, and agent improvement platform.LangfuseOpen-source LLM observability, prompt management, evaluations, and metrics platform.
Related workflows
Model API product prototype workflowSelect and test model APIs for a product feature before committing to architecture, pricing, or vendor lock-in.Research assistant workflowTurn open web research into source-backed notes, comparison tables, and a decision-ready recommendation.Voice agent API prototype workflowPrototype a voice AI feature with real audio fixtures, latency checks, transcript review, and privacy boundaries before committing to a provider.RAG knowledge base evaluation workflowEvaluate a RAG knowledge base by testing ingestion quality, source retrieval, answer faithfulness, and update ownership before scaling infrastructure.Model API cost monitoring workflowTrack model API usage, quality, latency, retries, and cost per useful output before an AI product prototype becomes expensive.
Related guides
The Qidao AI tool selection frameworkA practical seven-part framework for choosing AI tools by task fit, workflow fit, quality, cost, privacy, replaceability, and automation readiness.Model API selection framework for AI product buildersA method for comparing model APIs by task fit, quality, latency, cost, privacy, and fallback strategy.How to judge whether an AI tool is worth paying forA practical framework covering replacement cost, reliability, privacy, team fit, and switching risk.Voice agent API selection frameworkA practical method for evaluating speech-to-text, TTS, and voice agent APIs with real audio fixtures, latency targets, and privacy review.AI prototype hardening checklistA practical checklist for deciding when an AI-generated prototype is ready for engineering review, production hardening, or rebuild.How small teams should choose a RAG stackA practical guide to choosing embeddings, vector search, retrieval evaluation, data ingestion, and model APIs for small-team RAG systems.Voice agent launch checklist for AI product buildersA launch checklist for voice agents covering scripts, latency, fallback, transcription, escalation, consent, and production monitoring.