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8/1/2026
Building offline-first PWAs for the 3.4 billion people without reliable internet

Building offline-first PWAs for the 3.4 billion people without reliable internet

Original: I Built an App That Works Without Internet — Here's Why Silicon Valley Won't

Short summary

A developer in the Dominican Republic built an offline-first PWA for cacao vendors who operate in mountainous areas with no internet. The app uses a local-first architecture with a sync queue that pushes transactions to Supabase when connectivity returns, and prints receipts via Web Bluetooth API using ESC/POS commands. The author argues this represents a massive underserved market that Silicon Valley ignores — agricultural aggregators, rural clinics, and field operations across Latin America, Africa, and Southeast Asia.

  • •Offline-first PWA uses local device as source of truth with Supabase sync queue
  • •Bluetooth thermal printing from browser via Web Bluetooth API and ESC/POS commands
  • •Author identifies 3.4B people with unreliable internet as a major software market opportunity

Generated with AI, which can make mistakes.

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