GhostRun — The Test Suite for No-Code Automations That Catches the Failure Before It Costs You a Client
Nobody tests their Zapier workflows until a client calls screaming. GhostRun lets automation builders define expected outputs for each workflow step, replay test payloads on demand, and get a pass/fail report before deploying changes — like Jest but for Make and Zapier.
Difficulty
intermediate
Category
Developer Tools
Market Demand
High
Revenue Score
7/10
Platform
Web App
Vibe Code Friendly
No
Hackathon Score
5/10
Validated by Real Pain
— sourced from real community discussions
No-code automation builders have no systematic way to test workflows before deploying changes to production, leading to silent failures and client-impacting bugs that only surface after live data is corrupted.
What is it?
No-code automation builders ship untested workflows to production daily because no testing primitive exists for Zapier or Make — you either run it live and pray or manually trace logs after the damage is done. GhostRun provides a simple UI to define expected output assertions per step, store test payloads, replay them against live workflows via webhook, and produce a color-coded pass/fail report. This is the QA layer the entire no-code community has been duct-taping together with Google Sheets and prayer. Fully buildable with Next.js, Supabase for test case storage, and Make/Zapier webhook replay — no ML required, pure logic validation.
Why now?
Make and Zapier both stabilized webhook execution APIs in 2024, making external test replay finally reliable — and the June 2026 vibe-coding wave means thousands of new automation builders are shipping untested workflows to clients every week.
- ▸Test case builder where user defines expected field values and operators per workflow step (Implementation note: Zod schema validates assertion structure)
- ▸One-click test replay that fires stored payload to live webhook and captures response
- ▸Color-coded pass/fail report with field-level diff showing expected vs actual output
- ▸Shareable test report link for client transparency and handoff documentation
Target Audience
No-code automation builders and small agencies using Make or Zapier, approximately 200,000 active builders globally paying $50+/month on tooling.
Example Use Case
Priya, a freelance Make builder, defines 5 assertions for her CRM sync scenario — field not null, record count above zero, status equals active. Before deploying a client update she hits Run Tests and sees 4 pass, 1 fail, and fixes it in 10 minutes instead of getting a support call on Monday.
User Stories
- ▸As a freelance Make builder, I want to run a test suite before deploying a workflow change, so that I catch failures before my client's live data is affected.
- ▸As an automation agency lead, I want to share a test report link with clients after delivery, so that I can prove the workflow was validated before handoff.
- ▸As a no-code builder, I want to define expected field values per workflow step, so that I know exactly which assertion failed when a test run breaks.
Done When
- ✓Test case creation: done when user pastes a webhook URL, enters a JSON payload, and adds one assertion, then sees the test case card appear in the dashboard.
- ✓Test run: done when user clicks Run Tests and sees a color-coded pass/fail result within 10 seconds showing each assertion status.
- ✓Diff view: done when a failing assertion shows the expected value and actual received value side by side in red.
- ✓Shareable report: done when user clicks Share and receives a public URL that displays the test run result without login.
Is it worth building?
$39/month x 120 builders = $4,680 MRR at month 4. Math: 2,400 cold outreach targets in Make and Zapier communities at 5% trial, 20% paid conversion.
Unit Economics
CAC: $20 via community DMs at 5% trial conversion. LTV: $468 (12 months at $39/month). Payback: 1 month. Gross margin: 90%.
Business Model
SaaS subscription
Monetization Path
Free tier for 3 test cases. Paid at $39/month for unlimited test cases and workflow replays.
Revenue Timeline
First dollar: week 3 via beta paid upgrade. $1k MRR: month 3. $5k MRR: month 7.
Estimated Monthly Cost
Supabase: $25, Vercel: $20, Resend: $10, Stripe: ~$15. Total: ~$70/month at launch.
Profit Potential
$5k MRR is achievable within 5 months targeting Make power users specifically.
Scalability
Medium — can expand to n8n support, team accounts, CI/CD webhook trigger for auto-testing on workflow changes.
Success Metrics
Week 2: 30 beta builders with test cases live. Month 2: 40 paid. Month 4: 82% retention.
Launch & Validation Plan
Post a poll in Make community: 'Have you ever had a workflow silently break after an update?' — collect responses, DM every yes-voter.
Customer Acquisition Strategy
First customer: DM 30 active Make community members who have posted about workflow bugs, offer free lifetime plan for weekly feedback. Ongoing: Make and Zapier community tutorials, ProductHunt launch, SEO content targeting 'how to test Zapier workflows'.
What's the competition?
Competition Level
Low
Similar Products
Healthchecks.io (post-deployment monitoring only), Postman (API testing only, no Make/Zapier integration), Make native scenario testing (no assertions, no diff reporting).
Competitive Advantage
Only product offering step-level assertion testing for no-code automations — competitors only offer monitoring after deployment, not pre-deployment testing.
Regulatory Risks
Low regulatory risk — processes user-defined test payloads only, no PII required for core functionality.
What's the roadmap?
Feature Roadmap
V1 (launch): webhook replay, Zod assertions, pass/fail report, shareable link. V2 (month 2-3): scheduled auto-runs, email alert on failure. V3 (month 4+): n8n support, CI/CD webhook trigger.
Milestone Plan
Phase 1 (Week 1-2): schema, CRUD, assertion engine, replay endpoint. Phase 2 (Week 3-4): UI, Stripe billing, seed demo. Phase 3 (Month 2): 40 paid users, shareable report link live.
How do you build it?
Tech Stack
Next.js, Supabase, Resend, Stripe — build with Cursor for test runner logic, v0 for test report UI components
Suggested Frameworks
Next.js App Router, Supabase Postgres, Zod for assertion validation
Time to Ship
2 weeks
Required Skills
Next.js, Supabase, Zod validation, webhook HTTP mechanics.
Resources
Make API docs, Zapier webhook docs, Zod docs, Supabase quickstart.
MVP Scope
app/page.tsx (landing), app/dashboard/page.tsx (test case list), app/api/testcases/route.ts (CRUD), app/api/run/route.ts (replay and assert), lib/db/schema.ts (Drizzle schema), lib/assert.ts (Zod assertion engine), components/TestCaseCard.tsx (pass/fail UI), components/DiffView.tsx (expected vs actual), seed.ts (demo test cases), .env.example.
Core User Journey
Sign up -> paste webhook URL -> define payload and assertions -> click Run Tests -> see pass/fail report in under 10 seconds.
Architecture Pattern
User defines test case with payload and assertions -> stored in Supabase -> Run Tests fires HTTP request to workflow webhook -> captures response -> Zod assertion engine validates fields -> pass/fail result stored -> report rendered.
Data Model
User has many Workflows. Workflow has many TestCases. TestCase has one Payload and many Assertions. TestRun belongs to TestCase and has one TestResult with field-level diffs.
Integration Points
Stripe for payments, Resend for email, Supabase for database and auth, Zod for assertion validation engine, Vercel for hosting.
V1 Scope Boundaries
V1 excludes: n8n support, scheduled auto-runs, CI/CD integration, team accounts, mobile app.
Success Definition
A paying builder runs a full test suite on a client workflow before deploying, catches a real failure, and tells another builder about it unprompted.
Challenges
Distribution challenge: automation builders do not identify as needing testing tools until after a failure — content marketing must lead with disaster stories, not feature lists.
Avoid These Pitfalls
Do not build a visual workflow editor — only test against existing live webhooks or you scope-creep for months. Do not require Make API auth in V1 — webhook replay is simpler and covers 90% of use cases. Finding first 10 paying users takes 3x longer than building; start outreach before the product is ready.
Security Requirements
Supabase Auth with magic link. RLS on all tables per user. Input validation via Zod on all API routes. Rate limit replay endpoint to 20 runs/hour per user.
Infrastructure Plan
Vercel for frontend and API. Supabase for Postgres and auth. Sentry for errors. GitHub Actions CI. Total ~$70/month.
Performance Targets
200 DAU at launch, 2,000 req/day. Test run API under 3s including external webhook call. Dashboard load under 2s.
Go-Live Checklist
- ☐Security audit complete.
- ☐Payment flow tested end-to-end.
- ☐Sentry live.
- ☐Replay endpoint tested against real Make webhook.
- ☐Custom domain with SSL.
- ☐Privacy policy published.
- ☐10 beta builders signed off.
- ☐Rollback plan documented.
- ☐Launch post ready for Make and Zapier communities.
First Run Experience
On first run: two demo test cases pre-seeded with stored payloads, one passing and one failing with a visible field diff. User can immediately click Run Tests on the demo and see the pass/fail report. No manual config required: demo runs against a seeded mock endpoint that always returns the stored example response.
How to build it, step by step
1. Define Drizzle schema: Workflow, TestCase, Payload, Assertion, TestRun, TestResult tables. 2. Run npx create-next-app with Tailwind and App Router. 3. Set up Supabase with RLS per user ID. 4. Build CRUD API for test cases and payloads. 5. Build /api/run route that fires HTTP POST to stored webhook URL with stored payload and captures response body. 6. Implement Zod-based assertion engine in lib/assert.ts comparing response fields to expected values. 7. Store TestRun result with field diffs in Supabase. 8. Build TestCaseCard and DiffView components with v0 showing green/red per assertion. 9. Add Stripe billing gating beyond 3 free test cases. 10. Verify: create a test case, run it against a live Make webhook, confirm pass/fail renders with field diff in under 10 seconds.
Generated
June 3, 2026
Model
claude-sonnet-4-6
Disclaimer: Ideas on this site are AI-generated and may contain inaccuracies. Revenue estimates, market demand figures, and financial projections are illustrative assumptions only — not financial advice. Do your own research before making any business or investment decisions. Technology availability, pricing, and market conditions change rapidly; always verify details independently.