Relay.app is a collaborative workflow automation platform built around human-in-the-loop AI. It combines traditional automation with AI steps and human approval gates, letting teams build workflows where AI handles the bulk of work but humans review and approve critical decisions. The leading choice for teams that need AI automation with oversight.
Zapier is the largest workflow automation platform, connecting 6,000+ apps with no-code automations. Its AI features include built-in LLM actions, AI-powered workflow building, and natural language automation creation. Zapier is the default choice for business users automating repetitive tasks across SaaS tools, now enhanced with AI capabilities for content generation, classification, and data extraction.
Core capabilities each platform advertises.
What each tool does well, and the limitations to keep in mind.
Pros
Cons
Pros
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Choose Relay.app if you wantChoose if you want
Choose Zapier if you wantChoose if you want
Respan lets you trace LLM and agent calls across any model or framework, A/B test prompts on production traffic, and route requests across 500+ models through one gateway.