Optical flow Analysis vs Unroll
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Optical flow Analysis
Analyze motion between video frames and visualize object movement. This utility helps understand visual dynamics in sequences of images.
- Optical flow analysis
- Visualize object movement
- Frame-to-frame comparison
- Motion tracking
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Perform optical flow analysis and visualize the amount of object movement between consecutive frames
Unroll
Effortlessly combine multiple screenshots, photos, or screen recordings into a single, seamless long image. Perfect for sharing lengthy conversations, articles, or web pages without losing context. It automatically stitches content and cleans up the status bar for a polished look.
- Video to long image conversion
- Automatic stitching of overlapping content
- High-quality image export
- Status bar cleanup
- Supports horizontal and vertical stitching
- Offline processing
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Easily stitch multiple screenshots, photos, or even screen recordings together to create seamless long images. Whether it's a long chat history, a webpage, or an article, Unroll merges them flawlessly. NEW: Video to Long Screenshot Stop taking multiple screenshots! Just screen record your scrolling, and Unroll will automatically extract and stitch the frames into a perfect long image in seconds. Key Features: • Video to Long Image: Convert screen recordings into seamless long screenshots effortlessly. • Auto-Stitching: Automatically detects overlaps and stitches photos instantly. • High-Quality Export: Retain the original resolution and quality of your images. • Clean up Status Bar: Automatically cleans up and unifies the iOS status bar for a neat look. • Horizontal & Vertical: Supports both vertical scrolling screenshots and horizontal panoramas. • Privacy First: All stitching is done locally on your device. No internet connection required. Perfect for sharing conversations, receipts, articles, or any content that doesn't fit on a single screen. Terms of Use: https://sites.google.com/view/unroll-terms Privacy Policy: https://sites.google.com/view/unroll-privacy
Screenshots
Verdict
The clearest difference is rating: Unroll at 5.0 against Optical flow Analysis's 1.0. Unroll also leads on ads (none vs shown) and update cadence (every 6 days vs fortnightly). Optical flow Analysis's advantage is in-app purchases (none vs 2). On price, ratings volume, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Unroll sells 1 one-off in-app purchase. Optical flow Analysis asks for nothing beyond the download.
Unroll holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Optical flow Analysis ships an update fortnightly, Unroll every 6 days. The most recent releases landed on October 4, 2026 and October 6, 2026 respectively.
| Parameter | Optical flow Analysis | Unroll |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 5.0 (1 ratings) — better |
| Number of ratings | 1 | 1 |
| Update frequency | Fortnightly | Every 6 days — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported — better | Free with in-app purchases |
| Devices | iPhone | iPhone |
| Requires iOS | 17.7.2 | 16.0 — better |
| Further details — not scored | ||
| Size | 38 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Hideaki Uchikoshi | 月梅 孙 |
Customer experience
Optical flow Analysis
Unroll
In-app purchases
Optical flow Analysis
No in-app purchases
Unroll
- Premium – One-Time Unlock2 variants$0.99
