Offline-First Field Terminal + 5 MEP Calculators – Construction Foremen's Daily Log App

A production-ready mobile PWA designed for foremen working in network dead zones. This isn't just a daily log app – it's a complete field toolkit with 5 proprietary MEP calculators, GPS/weather-verified reports, and an offline-first engine that queues data locally and syncs automatically. Key Highlights: - Offline-first – works in basements, parkades, remote sites (no signal needed) - 5 MEP calculators – voltage drop, cable tray fill, wire pull, pipe offsets, trench spoil - Audit-ready PDF reports – generated server-side with GPS and weather lock - Production-ready – 99.16% Vitest coverage, zero compiler warnings - Companion office OS available – ask about the bundle ($30k for both) What you get: - Full Next.js 16 PWA codebase - Vercel project (CI/CD ready) - Supabase schema + RLS - IndexedDB offline-first engine - Serverless PDF pipeline - 5 proprietary calculators - Domain The Build vs. Buy Advantage: Replicating this from scratch would cost $120k+ and take 4–6 months. Acquire it for $9,999 and deploy immediately. Growth Opportunities: - Activate the PLG engine – the 5 calculators already rank for high-intent keywords. A small SEO budget ($500/mo) could 10x traffic. - List on Flippa – the pre-revenue cap is $9,999; this listing is already at that price, making it a perfect fit for Flippa buyers. - White-label to GCs – general contractors would pay $5k–$10k/year for a private-labelled version. - Add AI briefs – PostHog "Painted Door" CTAs show demand. Building this would unlock $50k+ ARR. - Bundle with companion office OS – the combined ecosystem (field + office) is worth $30k; existing buyers may upgrade.