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Product Requirements Document

Updated 1/19/2026
2 min read

Postcard iOS App - Product Requirements Document

Milestone 1: MVP Implementation

Version: 1.1 (Updated with iOS Implementation Spec) Date: January 16, 2026 Platform: iOS (Swift) + Cloudflare Infrastructure Status: Developer Ready - Implementation Spec

1. Executive Summary

Postcard is a "back to basics" social media app for iOS that prioritizes meaningful friend connections over engagement. It strips away modern social media's attention traps and returns to simple photo/video sharing.

Core Experience

Users share photos and videos in chronological order with their friends. That's it. No distractions, no doom-scrolling, just connections.

2. Technical Stack

2.1 iOS Client (Swift)

  • UI Framework: SwiftUI
  • Authentication: Auth0 iOS SDK (SMS OTP)
  • Networking: URLSession (async/await)

2.2 Cloudflare Infrastructure

  • Workers: API backend and business logic.
  • D1: Relational database (SQLite).
  • Images: Photo storage and optimization.
  • Stream: Video upload and delivery.

3. Milestone 1 Scope

Authentication & Profile

  • Auth0 SMS OTP login/registration.
  • User profiles with name, DOB, and avatar.
  • Public profile URLs (getpostcard.app/u/{public_id}).

Friends System

  • Mutual-only friendship model.
  • Contact-based friend discovery.
  • Block and Report functionality for safety.

Posting & Feed

  • Photo and video uploads (max 60s video).
  • Carousel posts (up to 10 items).
  • Reverse chronological feed.
  • Simple like system ("Liked by Mason and others").

Safety & Moderation

  • Pre-post automated content filtering.
  • In-app reporting and blocking.
  • Admin dashboard for manual review.