ReefScan vs Hourglass
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ReefScan
Capture underwater images and depth data to create 3D models with a companion desktop application. This tool is fast, accurate, and versatile, working both above and below water.
- Underwater image and depth map collection
- 3D model creation with MacOS companion app
- Fast and accurate scanning
- Above-water scanning capability
- Compatibility with other photogrammetry apps
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ReefScan for iOS collects images and depth map data for underwater features such as reefs, coral, and wrecks. This data can then be used with the MacOS companion app ReefBuild to create a 3-D model. Very fast and accurate scanning. Also works above water and can be used with other photogrammetry applications besides ReefBuild.
Hourglass
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This is an approximately 3-minute hourglass that uses physics simulation to recreate realistic movements. You can enjoy watching the grains of sand smoothly fall under natural gravity while keeping track of time. With a simple and intuitive design, it's an ideal tool for meditation or improving focus. When the gyroscope sensor is enabled, the movement of the sand adjusts in real-time according to the tilt of your device. Each session offers a different atmosphere, allowing you to relax and experience the comforting analog feel within a digital space.
Screenshots
Verdict
The clearest difference is ads: ReefScan at none against Hourglass's shown. ReefScan also leads on iOS requirement (14.0 vs 16.0). Hourglass's advantage is update cadence (every 4 days vs every 23 months). On price, in-app purchases and device support 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. Neither carries in-app purchases, so what you see is what you pay.
ReefScan ships an update every 23 months, Hourglass every 4 days. The most recent releases landed on October 3, 2026 and September 15, 2026 respectively.
| Parameter | ReefScan | Hourglass |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 23 months | Every 4 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 14 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | CraniaLab, LLC | kenji abe |
In-app purchases
ReefScan
No in-app purchases
Hourglass
No in-app purchases
