RentCheck - Mobile Inspection Report Builder for Independent Landlords Who Still Email iPhone Photos
Independent landlords with 1-5 units are generating property inspection reports by emailing themselves a bunch of blurry iPhone photos and writing descriptions in a Notes app. It's 2026 and they're still doing this. RentCheck is a mobile-first app where landlords walk a unit, tap to document each room, add photos and condition ratings, and export a timestamped PDF report with one button — covering move-in, move-out, and routine inspections for under $12/month.
Difficulty
beginner
Category
Home Services Tech
Market Demand
High
Revenue Score
7/10
Platform
Web App
Vibe Code Friendly
⚡ YesHackathon Score
🏆 7/10
What is it?
The property inspection report is the landlord's only legal protection against security deposit disputes, yet 80% of independent landlords (managing 1-5 units) have no structured process — just a folder of disorganized photos and a vague memory of what was there before. RentCheck is a mobile-first progressive web app where landlords create a property template (rooms, fixtures, appliances), walk the unit during an inspection, tap condition ratings, attach photos from their camera roll, add notes by room, and export a timestamped, tenant-acknowledged PDF report in one tap. Templates pre-populate standard rooms so setup takes 3 minutes. Tenants can be sent a review link to acknowledge the report via a one-click signature. Built on Next.js PWA, Supabase Storage for photos, React PDF for report generation, and Stripe for billing. Ships in two weeks. Why now: the eviction and deposit dispute surge of the last two years has made documentation legally critical, and PWA camera access is now stable enough to build a native-feeling mobile inspection tool without a native app.
Why now?
Web Camera API and PWA capabilities in modern mobile browsers are now stable enough to replace a native app for photo-capture workflows, and the post-2024 rental market volatility has made deposit documentation a hot legal issue for independent landlords in forums and communities.
- ▸Room-by-room inspection flow with tap-to-rate condition (Excellent/Good/Fair/Poor) and camera photo capture per item (Implementation note: Next.js PWA with Web Camera API)
- ▸One-tap PDF report generation with all photos, condition ratings, timestamps, and property address via @react-pdf/renderer
- ▸Tenant signature link: send a review URL, tenant acknowledges the report with one tap, signature recorded in Supabase
- ▸Pre-built property templates: apartment, house, studio — auto-populate standard rooms and fixture checklists so setup takes under 3 minutes
Target Audience
Independent landlords managing 1-5 rental units — estimated 14M in the US, with active communities on Reddit r/landlord (180k members) and BiggerPockets forums.
Example Use Case
Dave owns 3 rental units in Chicago and lost a $1,200 security deposit dispute because he had no documented move-in condition. He uses RentCheck for every inspection now — walks the unit in 12 minutes, taps condition for each room, exports the PDF, and emails the tenant a signature link. No more disputes.
User Stories
- ▸As an independent landlord with 3 units, I want to document room conditions with photos during a move-in inspection on my phone, so that I have timestamped evidence if a tenant disputes the deposit.
- ▸As a landlord completing a move-out inspection, I want to generate a professional PDF report in one tap with all photos and condition ratings, so that I can email it to the tenant the same day.
- ▸As a tenant acknowledging a move-in report, I want to review and sign the inspection record from a link on my phone, so that I have a copy and both parties are protected.
Done When
- ✓Inspection flow: done when landlord can tap through all rooms in a property template, rate each room condition, and attach at least one photo per room entirely from their phone browser.
- ✓PDF generation: done when landlord taps Generate Report and receives a downloadable PDF within 8 seconds containing all room conditions, photos, timestamps, and property address.
- ✓Tenant signature: done when tenant opens the emailed link, reviews the inspection summary, taps Acknowledge and Sign, and landlord dashboard shows status as Signed with timestamp.
- ✓Billing gate: done when a user with 3 completed free inspections tries to start a 4th and is redirected to Stripe checkout, gaining immediate access after payment.
Is it worth building?
$12/month x 100 customers = $1,200 MRR at month 2. $12/month x 400 customers = $4,800 MRR at month 5. Assumes 2% conversion from Reddit r/landlord and BiggerPockets with genuine helpful content posts.
Unit Economics
CAC: $12 via Reddit organic posts and content. LTV: $144 (12 months at $12/month). Payback: 1 month. Gross margin: 83%.
Business Model
SaaS $12/month for up to 5 properties, $24/month for up to 20 properties
Monetization Path
Free tier: 1 property, 3 inspections lifetime. Paid unlocks unlimited inspections, PDF export, and tenant signature link.
Revenue Timeline
First dollar: week 2 beta upgrade. $1k MRR: month 2. $5k MRR: month 7.
Estimated Monthly Cost
Supabase: $25 (Storage for photos), Vercel: $20, Resend: $10, Stripe fees: ~$15. Total: ~$70/month at launch.
Profit Potential
Lifestyle business at $4k-$8k MRR with low churn due to annual rental cycles.
Scalability
Medium-High — add property manager team plans, tenant portal, and maintenance request tracking at V2.
Success Metrics
Week 2: 100 signups from Reddit posts. Month 1: 40 paid. Month 2: 75% of paid users complete at least 3 inspections.
Launch & Validation Plan
Post a genuine question in r/landlord about how they currently handle inspections, collect 40 responses, DM the 15 most frustrated with a free beta link.
Customer Acquisition Strategy
First customer: post a detailed comment in r/landlord sharing a free inspection checklist PDF (no product pitch), add a subtle link at the bottom, DM the upvoters who engage most. Ongoing: Reddit r/landlord helpful content strategy, BiggerPockets blog post, YouTube Shorts showing a 12-minute inspection walkthrough, Google Ads targeting 'rental inspection checklist' (2,400 monthly searches).
What's the competition?
Competition Level
Low
Similar Products
zInspector ($35/month, native app, designed for large property managers), Rental Hero ($45/month, overkill for small landlords), HappyCo ($60/month, enterprise-only) — none offer a sub-$15/month PWA designed for landlords with under 5 units.
Competitive Advantage
zInspector and Rental Hero exist but cost $35-$60/month, require a native app download, and are designed for property managers with 50+ units. RentCheck is $12/month, works in a mobile browser, and is designed for the landlord with 3 units who just wants a PDF.
Regulatory Risks
Inspection reports are legal documents in many states — add a disclaimer that RentCheck generates records but does not constitute legal advice. GDPR data deletion endpoint required for EU users (less likely audience). Low additional regulatory risk.
What's the roadmap?
Feature Roadmap
V1 (launch): property templates, mobile inspection flow, PDF export, tenant signature link. V2 (month 2-3): custom room templates, inspection comparison (move-in vs move-out), reminder notifications. V3 (month 4+): team plans for property managers, tenant portal login, maintenance request tracking.
Milestone Plan
Phase 1 (Week 1-2): schema, inspection flow, photo upload, PDF generation live. Phase 2 (Week 3-4): tenant signature, Stripe billing, landing page, 10 beta landlords. Phase 3 (Month 2): 40 paid users, Reddit content campaign, BiggerPockets post.
How do you build it?
Tech Stack
Next.js PWA, Supabase Storage, React PDF, Stripe, Resend — build with Cursor for report generation and API routes, Lovable for the mobile-first inspection flow UI, v0 for room card components
Suggested Frameworks
Next.js App Router, @react-pdf/renderer, Supabase JS
Time to Ship
2 weeks
Required Skills
Next.js PWA with camera API, Supabase Storage photo uploads, React PDF generation, Stripe billing.
Resources
Next.js PWA setup guide, @react-pdf/renderer docs, Supabase Storage docs, Stripe billing docs.
MVP Scope
app/page.tsx (landing + free trial CTA), app/dashboard/page.tsx (properties list), app/properties/[id]/inspections/page.tsx (inspection history), app/inspect/[id]/page.tsx (mobile inspection flow), app/api/report/route.ts (PDF generation with react-pdf), app/api/signature/route.ts (tenant acknowledgment link), app/api/upload/route.ts (Supabase Storage photo upload), lib/db/schema.ts (Property, Room, Inspection, InspectionItem, TenantSignature), components/RoomCard.tsx (room inspection card), components/PhotoCapture.tsx (camera capture component), .env.example, seed.ts (1 demo property with 2 completed inspections)
Core User Journey
Sign up -> add property with template -> start inspection on mobile -> tap room conditions and add photos -> generate PDF -> send tenant signature link.
Architecture Pattern
Landlord opens PWA on phone -> walks room by room tapping conditions and capturing photos -> photos upload to Supabase Storage -> inspection data saved to Supabase -> landlord taps Generate Report -> react-pdf builds PDF with CDN photo URLs -> tenant receives Resend email with signature link -> one-tap acknowledgment saved to Supabase.
Data Model
User has many Properties. Property has many Rooms. Property has many Inspections. Inspection has many InspectionItems (one per Room). InspectionItem has Condition, Photos, Notes. Inspection has one TenantSignature.
Integration Points
Supabase for database, auth, and photo Storage, @react-pdf/renderer for PDF generation, Resend for tenant signature emails, Stripe for billing, Vercel for hosting.
V1 Scope Boundaries
V1 excludes: maintenance request tracking, tenant portal login, lease management, team accounts, native iOS/Android app, API access.
Success Definition
A landlord with 2 units finds RentCheck on Reddit, completes a full move-in inspection on their phone in under 15 minutes, emails the tenant the signed PDF, and renews their subscription the following month without any founder help.
Challenges
PDF generation with embedded photos can be slow and memory-intensive on mobile — use Supabase Storage CDN URLs in the PDF instead of base64 encoding photos to keep generation under 5 seconds. Distribution reality: landlords are not early adopters and do not browse ProductHunt — Reddit r/landlord and BiggerPockets content require genuinely helpful posts, not product pitches, to convert.
Avoid These Pitfalls
Do not embed photos as base64 in the PDF — use Supabase Storage public URLs or PDF generation will time out on large inspections. Do not launch with a native app — PWA is sufficient for the camera and photo workflows and saves 3 weeks of build time. Finding landlord customers on ProductHunt is nearly impossible — budget all acquisition effort on Reddit and BiggerPockets, not tech communities.
Security Requirements
Supabase Auth with Google OAuth, RLS on all property and inspection rows scoped to owner, Supabase Storage bucket set to private with signed URLs for photos, rate limiting 60 req/min per IP, GDPR data deletion endpoint.
Infrastructure Plan
Vercel for Next.js PWA hosting, Supabase for Postgres and photo Storage, GitHub Actions for CI, Sentry for errors, dev/staging/prod via Vercel preview branches. Total: ~$70/month.
Performance Targets
200 DAU at launch, 800 req/day. PDF generation under 8s. Photo upload under 3s per image. Inspection list loaded under 2s. Supabase Storage CDN for photo delivery.
Go-Live Checklist
- ☐Camera API tested on iOS Safari and Android Chrome.
- ☐PDF generation tested with 20+ photos without timeout.
- ☐Stripe payment flow tested end-to-end.
- ☐Sentry error tracking live.
- ☐Custom domain with SSL active.
- ☐Privacy policy with photo data retention clause published.
- ☐8 beta landlords completed a full inspection and signed off.
- ☐Rollback plan: previous Vercel deployment tagged.
- ☐Launch post drafted for r/landlord and BiggerPockets.
First Run Experience
On first run: 1 demo property (2-bedroom apartment) with 2 completed inspections (move-in and 6-month routine) is pre-loaded, including sample photos and a generated PDF. User can immediately open the demo inspection, view the room-by-room report, and start a new inspection on the demo property. No manual config required: Supabase seed runs on first auth, Supabase Storage demo photos are pre-uploaded via seed.ts.
How to build it, step by step
1. Define Drizzle schema for User, Property, Room, Inspection, InspectionItem, TenantSignature in lib/db/schema.ts. 2. Run npx create-next-app with Tailwind and PWA manifest configured in next.config.js for mobile home screen install. 3. Configure Supabase Auth with Google OAuth, RLS on properties and inspections scoped to owner, and Supabase Storage bucket for inspection photos. 4. Build PhotoCapture.tsx using the Web Camera API (getUserMedia) with fallback to file input for photo capture and immediate upload to Supabase Storage. 5. Build the room-by-room inspection flow in app/inspect/[id]/page.tsx with swipeable RoomCards, condition tap buttons, and photo thumbnails. 6. Create app/api/report/route.ts using @react-pdf/renderer to generate a PDF with property info, inspection date, room-by-room condition table, and Supabase Storage photo URLs inline. 7. Build app/api/signature/route.ts that generates a unique token, stores it in Supabase, and returns a public acknowledgment URL for the tenant. 8. Create the tenant-facing acknowledgment page at app/sign/[token]/page.tsx showing the report summary and a single Acknowledge and Sign button. 9. Wire Stripe billing with free tier (1 property, 3 inspections) and paid plans, Supabase Auth gate on inspection creation beyond free limits. 10. Seed 1 demo property with 2 completed inspections and exported PDFs, deploy to Vercel, walk full journey from property creation to tenant-signed PDF on a mobile browser.
Generated
April 29, 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.