Relay.app vs Zapier
Side-by-side comparison of AI visibility scores, market position, and capabilities
Human-in-the-loop workflow automation; $35M Series A from a16z and Khosla (Mar 2025); connects 100+ apps with embedded human approval steps for AI-human collaboration. Founded 2021, SF.
About
Relay.app is a human-in-the-loop workflow automation platform founded in 2021 in San Francisco. The company was built around the insight that fully automated workflows break down at the edges — when decisions require human judgment, context that only a person has, or approval before an irreversible action. Relay.app's core design principle is that AI agents and humans should collaborate in workflows rather than the AI operating autonomously.\n\nThe platform connects to 100+ applications including Salesforce, HubSpot, Slack, Gmail, Notion, and Airtable, enabling teams to build complex cross-app automations with embedded human checkpoints — approval steps, form fills, and manual decisions that slot naturally into otherwise automated flows. Relay.app's AI agents can draft content, classify data, extract information from documents, and make routing decisions, with humans stepping in only where judgment is needed. Target users are operations, revenue, and customer success teams at mid-market B2B companies.\n\nRelay.app raised a $35 million Series A in March 2025 co-led by Andreessen Horowitz and Khosla Ventures, validating its human-in-the-loop positioning in a market increasingly crowded with fully autonomous automation tools. The funding has accelerated the expansion of its AI agent capabilities and integration library. Relay.app competes with Zapier, Make, and newer AI automation platforms but differentiates through its thoughtful balance between automation efficiency and human oversight.
Zapier is the leading no-code automation platform connecting 7,000+ apps, with $310M revenue in 2024 and profitable since 2014, serving 1.8M+ businesses that automate workflows without coding.
About
Zapier is the dominant no-code automation platform that enables business users to connect applications and automate workflows without writing code. Founded in 2012 by Wade Foster, Bryan Helmig, and Mike Knoop, Zapier built a massive library of app integrations—now exceeding 7,000 apps—connected through a trigger-action model: when an event happens in one app (a new email, a form submission, a sale), Zapier automatically performs actions in other apps (creating a record, sending a notification, updating a spreadsheet). This simple concept enabled millions of businesses to automate time-consuming manual processes.
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