Relay.app

Build a small human-in-the-loop workflow across two approved services

KINDA · partial replacement

🪦 Relay.app announced its shutdown in July 2026: new signups stopped on July 16, free accounts close August 15, and paid accounts September 14, 2026. The verdict below is now a post-mortem.

price historical · $19/moestimated build time closest consolation build: multi-dayreplaced by 0 people

The core loop is buildable, but a dependable replacement becomes a real weekend or multi-day project. For Relay.app, build a small human-in-the-loop workflow across two approved services. The hard boundary is polished approvals, ai steps, integrations, shared workflows, and managed execution, plus connector breadth and execution reliability.

Build verification: not recorded. How we judge buildability

What you give up

  • polished approvals, AI steps, integrations, shared workflows, and managed execution
  • thousands of connectors
  • maintained OAuth applications
  • schema-drift handling
  • high-scale durable execution and support

Why people still pay

People still pay for Relay.app because one automation is easy; maintaining hundreds of connectors and making every run recoverable is the business. The recurring cost buys OAuth review, token refresh, webhooks, polling, schemas, retries, idempotency, queues, secrets, rate limits, observability, and upgrades, not just the visible interface.

Your build guide

The stack, security requirements, and agent rules for a focused replacement.

Before you start

  • Node.js 22 and a writable local SQLite/work directory
  • Owner-authorized credentials or command prerequisites for only the registered operations
01
Node.js 22, Express, TypeScript, better-sqlite3 and a persisted job worker. Use a fixed registry of typed operations and a small React/Vite control page; credentials and process execution remain in narrow server adapters.
02
Domain model: workflow versions, trigger events, step states, approval tokens, action receipts.
03
Implementation boundary: resume from a specific approved step and bind approval to the exact outgoing payload.
engineering roadmap

Implementation plan

1

Phase 1

Define the working slice and setup. Create AGENTS.md with the exact stack, permitted integrations and exclusions below. Model workflow versions, trigger events, step states, approval tokens, action receipts; provide one labelled sample that exercises a two-service workflow runner that pauses at a durable human approval step. Document every enabled operation, trigger/callback requirements, allowed working directories and command/provider prerequisites. Provide fixture events and a dry-run planning mode that performs no external mutations.

2

Phase 2

Build the domain workflow before polishing the interface. Implement the input, review, committed state and output for a two-service workflow runner that pauses at a durable human approval step. Enforce this invariant in the service layer: resume from a specific approved step and bind approval to the exact outgoing payload. Use explicit IDs and schema versions so later edits do not silently change earlier outcomes.

3

Phase 3

Make the core interaction usable. Present the saved workflow versions, trigger events, step states and their current revision/state; provide an inspectable preview before consequential changes. Add labelled empty/loading/error states, keyboard navigation and a narrow-screen layout where the target platform supports it.

4

Phase 4

Add failure recovery and boundaries. Treat external text and model output as untrusted data. Permit only declared operations with schema-validated arguments; keep approval bound to exact arguments, scope and revision. Never pass untrusted command strings to a shell. Persist trigger IDs, operation attempts, approval state and receipts. Resume from known checkpoints, bound retries and require inspection of uncertain external outcomes. A stopped worker cannot reset approvals or duplicate completed operations. Exercise this app-specific recovery case during implementation: a changed payload invalidates approval; retrying after restart does not repeat completed external actions.

5

Phase 5

Deliver an inspectable result. Walk through a two-service workflow runner that pauses at a durable human approval step using labelled sample inputs; show the saved data and final output together. Acceptance cases: A changed payload invalidates approval; retrying after restart does not repeat completed external actions. Also document a canceled operation, an unavailable dependency, and export/restore of the state that this scope actually persists.

6

Phase 6

Handoff and operating notes. Include setup/run/build commands that actually exist, environment placeholders or native permission setup as appropriate, migrations, sample inputs, data locations, backup/recovery instructions and the exclusions: general-purpose connector platforms and autonomous irreversible actions. Report what was implemented and what was actually checked; do not claim production readiness, certification or measured performance without evidence.

the pro prompt
download AGENTS.md
WORKING SLICE
Build a two-service workflow runner that pauses at a durable human approval step, inspired by Relay.app. This is a limited, owner-operated alternative for one useful workflow; it does not replace the full paid product. Leave out general-purpose connector platforms and autonomous irreversible actions.

STACK AND SETUP
Node.js 22, Express, TypeScript, better-sqlite3 and a persisted job worker. Use a fixed registry of typed operations and a small React/Vite control page; credentials and process execution remain in narrow server adapters.
Document every enabled operation, trigger/callback requirements, allowed working directories and command/provider prerequisites. Provide fixture events and a dry-run planning mode that performs no external mutations.

WORKFLOW AND DATA
Model workflow versions, trigger events, step states, approval tokens, action receipts. Keep source inputs, editable decisions and generated outputs distinguishable; record stable IDs and revisions. The core rule is: resume from a specific approved step and bind approval to the exact outgoing payload. Build a complete input → review → commit → inspect/export path before optional features.

FAILURE AND RECOVERY
Treat external text and model output as untrusted data. Permit only declared operations with schema-validated arguments; keep approval bound to exact arguments, scope and revision. Never pass untrusted command strings to a shell.
Persist trigger IDs, operation attempts, approval state and receipts. Resume from known checkpoints, bound retries and require inspection of uncertain external outcomes. A stopped worker cannot reset approvals or duplicate completed operations.

PROJECT RULES / AGENTS.md
Create AGENTS.md at the project root before implementation. Include the following rules verbatim, then add the actual module layout, supported dependency versions, commands, data paths and environment/permission requirements as they are implemented. Keep UI, domain logic and external adapters separate. Do not add a service or platform solely to use a skill.
- Scope rule: implement a two-service workflow runner that pauses at a durable human approval step. Keep general-purpose connector platforms and autonomous irreversible actions outside this project unless the owner separately changes scope.
- Data rule: model workflow versions, trigger events, step states, approval tokens, action receipts. Preserve stable IDs, source timestamps and revision history; migrations must explain how existing records survive.
- Behavior rule: resume from a specific approved step and bind approval to the exact outgoing payload. Put this rule in the domain/service layer, not only in presentation code.
- Recovery rule: A changed payload invalidates approval; retrying after restart does not repeat completed external actions. Keep this failure/recovery fixture in the implementation checklist and report evidence honestly.
- Treat uploaded files, fetched pages, emails and model output as untrusted data. Keep secrets out of source, fixtures and diagnostic output. External side effects require explicit scope and recoverable state.
- Work in the numbered phases below. Update the delivery notes with actual evidence and unresolved limitations; never mark proposed acceptance cases as already passed.

ACCEPTANCE CASES
A changed payload invalidates approval; retrying after restart does not repeat completed external actions. Include one ordinary successful path and these edge cases in the future implementation's checks. Compare the saved domain state with the visible result and exported output; unavailable information must remain unknown rather than invented.

DELIVERY
Follow the six delivery phases accompanying this prompt. Ship source, AGENTS.md, README, sample inputs, explicit setup and data-recovery instructions. This is a limited, owner-operated alternative for one useful workflow; it does not replace the full paid product. Out of scope: general-purpose connector platforms and autonomous irreversible actions.

$ open in your agent (prompt prefilled, you press enter), copy the prompt or copy or download AGENTS.md · generated from this app's build plan

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Alternatives to building your own

Activepieces Community EditionVisual workflows with approval steps and human input, without paying per successful handoff.24kaug 2026open source↗n8n Community EditionHuman approval can sit inside a durable workflow; the interface is less relentlessly friendly.$0free↗

no votes, no pay-to-list · just what's real

Questions about Relay.app

Can you build your own Relay.app with AI?

Partly. The core loop is buildable, but a dependable replacement becomes a real weekend or multi-day project. For Relay.app, build a small human-in-the-loop workflow across two approved services. The hard boundary is polished approvals, ai steps, integrations, shared workflows, and managed execution, plus connector breadth and execution reliability.

What does the Relay.app build prompt cover?

The prompt starts with this scope: Build a two-service workflow runner that pauses at a durable human approval step, inspired by Relay.app. This is a limited, owner-operated alternative for one useful workflow; it does not replace the full paid product. Leave out general-purpose connector platforms and autonomous irreversible actions. Full-product capabilities excluded from the comparison include: polished approvals, AI steps, integrations, shared workflows, and managed execution; thousands of connectors; maintained OAuth applications. Follow the implementation plan and its prerequisites before expanding the build.

How do I use the prompt, AGENTS.md and agent skills?

Start with the Relay.app prerequisites and stack, then copy the prompt into your coding agent. Save the project rules as AGENTS.md in the project root. Linked skills are optional packages or source instructions for specific tasks; review their current contents and install only those matching the chosen stack. A skill does not supply API credentials or verify the finished app.

How long will this Relay.app project take?

The catalogue estimate is closest consolation build: multi-day for the limited scope. Setup, integration approvals, debugging, deployment and ongoing maintenance can add time. This is an estimate, not a delivery guarantee.

What would I give up by replacing Relay.app?

polished approvals, AI steps, integrations, shared workflows, and managed execution; thousands of connectors; maintained OAuth applications; schema-drift handling; high-scale durable execution and support. People still pay for Relay.app because one automation is easy; maintaining hundreds of connectors and making every run recoverable is the business. The recurring cost buys OAuth review, token refresh, webhooks, polling, schemas, retries, idempotency, queues, secrets, rate limits, observability, and upgrades, not just the visible interface.

What price is this guide comparing against?

The recorded Professional plan is $19/mo (monthly), checked 2026-07-31. Relay.app announced its shutdown in July 2026: new signups stopped on July 16, free accounts close August 15, and paid accounts September 14, 2026; this is historical pricing. Building your own also has hosting, API and maintenance costs; the recorded amount is not a guaranteed saving.

What can I use instead of building Relay.app?

Activepieces Community Edition: Visual workflows with approval steps and human input, without paying per successful handoff. n8n Community Edition: Human approval can sit inside a durable workflow; the interface is less relentlessly friendly. Check each option's license, hosting needs and feature limits.

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