✓
Tool
Category
Pricing
Free?
Updated
OpenAI Assistants API
AI Agents
Paid
—
Mar 2026
→
OpenAI managed API for building stateful AI agents with tools and persistent threads
Best for: OpenAI
Steel Browser
AI Agents
Freemium
✓
Mar 2026
→
Open-source browser API for AI agents with managed sessions and proxy support
Best for: browser-API
Exa AI
AI Agents
Freemium
✓
Mar 2026
→
Semantic search engine and API for AI agents using embedding-based retrieval
Best for: semantic-search
PromptLayer
AI Agents
Freemium
✓
Mar 2026
→
Prompt management platform with logging and analytics for LLM API calls
Best for: prompt-management
Helicone
AI Agents
Freemium
✓
Mar 2026
→
Open-source LLM proxy for logging, monitoring, and analyzing all AI API calls
Best for: LLM-proxy
Agency Swarm
AI Agents
Free
✓
Mar 2026
→
Open-source framework for creating collaborative AI agent networks with specialized roles
Best for: agency-swarm
Gumloop
AI Agents
Freemium
✓
Mar 2026
→
No-code visual AI workflow builder for creating agents that browse, scrape, and automate
Best for: no-code
Fixie AI
AI Agents
Freemium
✓
Mar 2026
→
Platform for building conversational AI agents with memory, tools, and deployable hosting
Best for: conversational
Steamship
AI Agents
Freemium
✓
Mar 2026
→
Cloud hosting platform for AI agents with built-in storage and multi-tenancy
Best for: agent-hosting
Amazon Bedrock Agents
AI Agents
Paid
—
Mar 2026
→
AWS-native AI agent builder using foundation models with enterprise security
Best for: AWS
Browserless
AI Agents
Freemium
✓
Mar 2026
→
Cloud-hosted headless browser service for web automation and AI agent workflows
Best for: headless-browser
Portkey AI
AI Agents
Freemium
✓
Mar 2026
→
AI gateway providing unified LLM access with reliability features and observability
Best for: AI-gateway