What this app is. What it isn’t. What you could build.

One-liner

SideLens is a minimalist app that lets users easily compare before and after photos side-by-side with a single tap.

Strengths

Simple, intuitive interface focused solely on side-by-side comparison (review: 'Just open the app, take two photos, and it’s done')
Fast performance with instant photo pairing and no lag (review: 'Loads in a second, no waiting')
No watermarks or branding—clean output for sharing
Works seamlessly with iOS Photos app integration
Highly rated for reliability and zero crashes

Weaknesses

Only supports two photos at a time—no batch processing or multiple comparisons
No editing tools to adjust brightness, contrast, or alignment between images
No export options beyond sharing to Messages or Photos (users want PDF or social media presets)
Limited to iOS only—no Android or web version
No cloud sync or backup for saved comparisons

Opportunities

Add one-tap alignment and auto-crop to fix misaligned before/after shots
Introduce templates for fitness, home renovation, skincare, and weight loss tracking
Enable batch mode to compare multiple before/after pairs in a scrollable gallery
Support export to PDF or Instagram Story format with branded overlays
Add iCloud sync so users can access comparisons across devices

Build ideas

Competitors

Generated by NVIDIA NIM llama-3.3-70b · 5/12/2026, 9:31:38 AM

First load takes ~60–120s while NVIDIA NIM gpt-oss-120b generates. Cached afterward.