Product Overview

Nostalgia is a premium vintage analog film camera iOS application built entirely with SwiftUI. It applies authentic, handcrafted analog film filters in real-time. Designed to recreate a classic vintage photography experience, the app offers 11 distinctive film presets inspired by famous film stocks (e.g., Kodak Portra 400, Fuji Velvia 50, Polaroid SX-70, and CineStill 800T), subtle analog grain, light leaks, vignette, and full RAW capture support.

Technical Stack

• Frontend: Swift & SwiftUI (iOS 18.0+)
• Camera Capture: AVFoundation
• Real-Time Image Processing: Metal & CoreImage shader chains (ensures smooth 60 FPS live preview)
• Post-Capture Enhancement: CoreImage filter pipelines (bloom, halation, chromatic aberration, luma-dependent grain)
• Monetization: RevenueCat SDK
• Analytics: Aptabase
• Local Persistence: @AppStorage (UserDefaults)

Libraries & Dependencies (Swift Package Manager)

• purchases-ios-spm (RevenueCat subscription management)
• Kingfisher (Image downloading and caching)
• Glur (Smooth background blurs)
• Alamofire (Network request routing)
• aptabase-swift (Privacy-first analytics)
• SwiftyJSON (JSON decoding helpers)
• firebase-ios-sdk (Firebase backend sync helper)

Core App Features

1. Film presets & Real-Time Processing

• 11 Film Stock Filters: High-fidelity film presets representing Kodak, Fuji, Polaroid, CineStill, and black & white stocks.
• Metal Shader Engine: Live 60 FPS viewfinder with real-time color grading.
• Two-Stage Processing Pipeline: Lighter processing runs during live preview, while a heavier CoreImage pipeline applies realistic bloom, halation, and grain post-capture.

2. Pro Camera Capture

• Apple ProRAW Support: High-dynamic-range RAW capture on supported iPhones (iPhone 12 Pro and later) for professional workflows.
• Exposure Control: Real-time exposure compensation slider (-0.7 to +0.7 EV).
• Vignette & Analog Grain: Customizable sliders to dial in vignette intensity and grain levels.

3. Non-Destructive Gallery Editor

• Filter Re-application: Apply, change, or remove filters on raw or previously filtered photos from the app gallery.
• Parameter Fine-Tuning: Re-adjust intensity, grain, and vignette in post-capture.
• Before/After Split Comparison: Slide to compare original raw capture and final filtered image in real-time.

4. Advanced Export System

• Resolution Control: Export in Original (full res), 4K, 1080p, or Instagram-optimized sizes.
• Multiple Formats: Save photos in JPEG, PNG, or HEIC formats.
• Compression & EXIF Controls: Choose compression levels (50%-100%) and toggle whether to strip or preserve photo metadata.

5. In-App Subscriptions (RevenueCat)

• Freemium Gate: The first 2 filters are free, while subsequent filters, RAW capture, and advanced exports require a premium subscription or lifetime unlock.
• Aptabase Analytics: Tracks usage metrics without collecting personal identifier data.