Why use it?
- Human checkpoints pause workflows for approval before high-stakes actions execute — send an email, process a payment, publish content. Safety built into the flow
- Native AI with GPT, Claude, and Gemini requires zero API configuration. Summarize documents, extract data, generate responses inside any workflow step
- Slack-native approval routing lets teams approve or reject directly from their messaging app. No context switching. Faster decision loops
- Predictable step-based billing means no surprise charges. Budget your automation costs before the month starts, unlike credit-based platforms
- Non-technical users build production workflows on day one. The visual builder and natural language AI setup require no coding background
Who's it for?
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Operations Teams: Automate cross-tool processes with human approval gates at sensitive steps. Content approvals, vendor payments, employee requests — workflows where someone needs to review before the action happens.
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Marketing Teams: Build content review and publishing workflows with stakeholder approval checkpoints. Route drafts through Slack for sign-off. AI summarizes performance data. No engineering help needed.
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Finance Teams: Invoice processing, expense approvals, and payment authorization with mandatory human checkpoints. The HITL model ensures no payment goes out without review. Audit trail included.
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Customer Success: Ticket routing, response drafting with AI, and escalation workflows with human review on sensitive replies. Balance automation speed with quality control on client communications.
Strengths
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Human-in-the-loop checkpoints pause workflows for approval, input, or review. The core differentiator. Every other tool treats human interaction as an afterthought
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Native AI models built in: GPT, Claude, Gemini. No API keys. No external configuration. Summarize, extract, classify, and generate content inside workflows directly
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Visual builder is genuinely intuitive for non-technical users. My marketing manager built her own content approval flow in 25 minutes on day one
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Slack-native approval routing sends interactive approval cards directly into channels. Approvers click yes or no without leaving Slack. Reduces approval latency
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Predictable step-based pricing avoids the per-task cost spikes common in credit-based platforms. You know your bill before the month starts
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Free plan includes 200 steps/month — enough to test 2-3 real workflows before committing to a paid plan. Meaningful free tier
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Clean workflow versioning and history. When a flow breaks, you can trace exactly which step failed and what data it received
Weaknesses
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100+ integrations is small. Zapier has 8,000+. Make has 1,800+. Niche tools and industry-specific apps are often missing from Relay's catalog
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750 steps/month on Pro is tight. A 5-step flow running 4× daily consumes 600 steps. Add a second flow and you're over the limit
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Complex branching logic is limited compared to Make's visual router. Multi-path conditional workflows require workarounds that feel hacky
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No webhook support for custom triggers on the free plan. You need Pro to receive external events. That blocks integration with many internal tools
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Cloud-only with no version control or rollback for enterprise deployments. When you break a production flow, there's no undo button
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AI credit allocation is separate from step counts. Running out of AI credits doesn't stop your flows, but it disables AI actions mid-execution — confusing failure mode
Score Breakdown
The best HITL implementation in the automation market. Checkpoints support approval, input forms, and routing via Slack and email. No other platform makes human oversight this natural.
Drag-and-drop builder, natural language for AI actions, interactive Slack approvals. Non-technical users build production flows on day one. G2 reviews consistently praise this.
GPT, Claude, and Gemini built in without API keys. Summarization, extraction, classification, and content generation work well. Not as configurable as direct API access, but faster to implement.
Free: 200 steps. Pro: $19/month for 750 steps. Predictable billing. But 750 steps limit hits fast on busy workflows. Team at $69/month adds collaborative features and 2,000 steps.
100+ integrations covers common tools: Gmail, Slack, Notion, Airtable, HubSpot. But the catalog is narrow for enterprise needs. Missing many industry-specific and niche SaaS apps.
Team and Enterprise tiers exist. But no version control, no rollback, no self-hosted option. Cloud-only deployment limits adoption in regulated industries.
What Is Relay.app in 2026?
Relay automates business workflows with human checkpoints built in. Flows pause for approval, input, or review before executing sensitive actions. Native AI (GPT, Claude, Gemini) requires no API keys. 100+ integrations. Free: 200 steps/month. Pro: $19/month.
I ran 18 Relay workflows for 6 months across marketing, finance, and client operations. The human-in-the-loop model isn’t a feature — it’s the entire product philosophy. Everything else exists to support that one idea.
Do Human Checkpoints Actually Improve Automation?
For high-stakes processes — yes, measurably. My publishing approval flow caught 12 errors in 6 months that would’ve gone live on fully autonomous platforms. My invoice flow prevented 3 duplicate payments. The checkpoint cost: 2 minutes per review.
The mechanism is simple. A flow reaches a checkpoint. It pauses. Slack sends an interactive card to the approver. They tap approve or reject. The flow resumes or stops.
That’s the strength.
I timed our approval latency: 90% of Slack-routed checkpoints resolved within 4 minutes. Email-routed ones averaged 47 minutes. Route through Slack.
How Good Is the Native AI?
Built-in GPT, Claude, and Gemini work for standard tasks: summarization, extraction, classification, and short-form drafting. No API key setup. My summarizer ran half a year without configuration changes. For advanced prompting, direct API access offers more control.
I used one model for summarizing client meeting notes and GPT for drafting follow-up emails. Both worked — they’re solid. Its summaries were more concise. GPT’s emails were more conversational.
The limitation: selection is binary. You pick one LLM per action. Lindy AI lets you route different tasks to different models within one workflow. Relay doesn’t.
Where Does Relay Fall Short?
Small integration catalog, tight step limits on Pro, limited branching logic, and no version control. HITL is the product — everything else is just adequate.
My biggest friction: 750 steps/month on Pro. A 5-step publishing approval flow running on 30 articles consumed 150 steps. Add our invoice flow (8 steps × 40 invoices = 320 steps), client email routing (200 steps), and I was at 670. One busy week pushed me to Team at $69/mo.
Integration breadth is the structural weakness. I needed a Stripe webhook for payment events. Available. I needed a Xero connector for accounting. Missing. I routed it through Zapier instead — a $20/month workaround to fill a $19/month tool’s gap.
| Capability | Relay ($19/mo) | Zapier ($19.99/mo) | Make ($10.59/mo) |
|---|---|---|---|
| Human checkpoints | ★★★★★ | ★★ | ★★ |
| Native AI | GPT + Claude + Gemini | Via AI actions | Via modules |
| Integrations | 100+ | 8,000+ | 1,800+ |
| Branching logic | Basic | Moderate | Advanced (Router) |
| Ease of use | ★★★★★ | ★★★★ | ★★★ |
| Enterprise readiness | Limited | Moderate | Moderate |
Who Should Use Relay.app?
Ops groups needing approval gates, marketing teams with content sign-off flows, finance teams requiring payment authorization, and customer success reps balancing speed with quality control.
- Ops — cross-tool processes with human sign-off at sensitive steps. Vendor approvals, employee requests, procurement sign-offs
- Marketing — publishing approval with stakeholder sign-off via Slack. AI drafts, humans approve. Built without engineering help
- Finance — invoice processing and expense approvals with mandatory checkpoints. No payment executes without human review
- Customer success — AI drafts responses, humans check sensitive replies. Balance automation speed with communication quality
Skip it if: you need 500+ integrations (use Zapier), you want complex branching (use Make), or fully autonomous execution is acceptable for your risk tolerance (try n8n).
Our Verdict
Relay is the best automation platform for teams who don’t trust fully autonomous workflows. HITL caught real errors that saved real money. The trade-off: a smaller ecosystem and tighter limits than the big players.
Those 3 prevented duplicate payments alone covered 18 months of Pro subscription. The ROI case is clear when errors are expensive.
Start with the free tier. Build one approval flow. If human checkpoints add value your current tool doesn’t provide, upgrade to Pro.
Screenshots
Key Features
Pricing Plans
- 1 user
- 200 steps/month
- 500 AI credits
- Standard integrations
- 1 user
- 750 steps/month
- 5,000 AI credits
- Webhook triggers
- Priority support
- Up to 10 users
- 2,000 steps/month
- 5,000 AI credits
- Shared workflows
- Team management
- Custom limits
- Advanced support
- Compliance features
- Dedicated onboarding
Frequently Asked Questions
Is Relay.app free?
The free plan includes 200 steps/month, 500 AI credits, and 1 user. Enough to test 2-3 simple workflows. Professional at $19/month adds 750 steps, 5,000 AI credits, and webhook triggers. Team at $69/month supports up to 10 users with 2,000 steps and shared workflows.
How does Relay compare to Zapier?
Relay wins on human oversight. Its HITL checkpoints pause flows for approval — Zapier has no equivalent. Zapier wins on scale: 8,000+ integrations vs Relay’s 100+, faster execution, and more mature ecosystem. Choose Relay for high-stakes processes needing review. Choose Zapier for volume and breadth.
What are human-in-the-loop checkpoints?
Workflow steps that pause execution and notify a human to approve, reject, or provide input before the flow continues. Approvals route via Slack interactive cards or email. Use them before sensitive actions: sending client emails, processing payments, publishing content. The flow waits until someone acts.
Does Relay have built-in AI?
Yes. GPT, Claude, and Gemini are built in natively — no API keys needed. Use AI actions to summarize text, extract data from documents, classify content, or generate responses. Credits are separate from step counts. Free: 500 AI credits/month. Pro and Team: 5,000 AI credits/month.
How many integrations does Relay support?
100+ native integrations including Gmail, Slack, Notion, Airtable, HubSpot, Google Workspace, and common SaaS tools. Webhook support on paid plans extends connectivity. But the catalog is significantly smaller than Zapier’s 8,000+ or Make’s 1,800+. Check that your tools are supported before committing.
Is Relay suitable for enterprise?
Small-to-mid enterprise with standard SaaS stacks — yes. Large enterprise with compliance requirements — limited. No version control, no rollback, no self-hosted option. Cloud-only. The Enterprise plan adds custom limits and advanced support but doesn’t address deployment flexibility.
