# AngleMetric — EntropyMetrics: Contact Angle > Mobile app for measuring liquid droplet contact angles on surfaces. (iPhone/iPad app by BABAK SANII.) - Source: https://appshunter.io/ios/app/anglemetric/id6787754166 (this page in markdown: same URL + `.md`) - Developer: [BABAK SANII](https://appshunter.io/developer/6787754378) - Category: Utilities, Productivity - Price: Free with in-app purchases - Rating: 5.00/5 from 3 App Store ratings - Age rating: 4+ - Requires: iOS 14.0 · 61 MB - Languages: American English - Released: 2026-08-18 - Data updated: 2026-09-18 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/anglemetric/id6787754166/reviews.md ## What is AngleMetric? Put a drop of water on a surface and watch what it does. On a clean pane of glass it flattens out. On a waxed car hood it beads up into a little dome. That shape — how much the drop sits up or spreads out — is the contact angle, and it tells you a lot about the surface underneath. Contact angle is one of the oldest measurements in surface science, and for a long time you needed a benchtop instrument that costs as much as a car to get a number out of it. This app does the core of that job with the camera you already carry. Here's how it works. You put a droplet on your sample, line the phone up, and the app finds the edge of the drop and fits it to theoretical curves. You get the contact angle in degrees, left and right sides, plus a fitted profile drawn over the live image so you can see exactly what it measured. There's a side-on mode for the classic profile view and a top-down mode for flatter, more wetting drops where you enter the volume and it works back to the angle. Who actually reaches for this: A grad student checking whether the oxygen plasma run actually changed the surface energy, before committing a whole experiment with it. An engineer qualifying a coating or a cleaning step and needing a number to put in the report. Anyone comparing materials — is this polymer more hydrophobic than that one, did the treatment hold up after a week, is the surface as clean as it's supposed to be? And also curious people in the kitchen (where much of surface science was founded). Contact angle is a nice way to show a kid why rain sheets off a freshly waxed surface but soaks into an old one, how succulents collect water, how a butterfly keeps its wings clean. What you get: - Side-on and top-down measurement modes of droplets (as small as 5µL with newer phones) - Contact angle in degrees - A gravity-adjusted Young-Laplace numerical fit that can work with larger droplets - Local Machine Learning droplet identification and profiling - Live overlay so you can see the fit on the real drop - Records saved on your device, with CSV export for your own analysis Lighting, focus, and a steady hand all affect the reading, same as any optical method. Used carefully it's repeatable and quick, which is often exactly what you need when measuring in the field, on unwieldy or oddly shaped samples, or for a quick check. A low-cost 10-100µL micropipette is an excellent accompanying purchase. Free to try. A one-time Pro purchase or subscription enables saved records and exports. An Analytical Lab plan adds an auditable 21 CFR Part 11 enabled database, biometrics, data webhooks and a guided ASTM D8597 measurement flow for teams that need process discipline. Due to the nature of the program phones with an ultra-wide angle lens (i.e., iPhone 11+) image small droplets better. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ AngleMetric Terms of Service: https://entropymetrics.com/CAterms.html Privacy Policy: https://entropymetrics.com/CAprivacy.html ## Key features - Side-on and top-down measurement modes - Contact angle in degrees - Gravity-adjusted Young-Laplace fit - Machine Learning droplet identification - Live overlay for profile visualization - Records saved with CSV export ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Pro Monthly | $1.99 | per month | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Lifetime Pro Purchase | $19.99 | one-time | | Analytical Lab / Enterprise | $200.00 | one-time | ## Frequently asked questions about AngleMetric ### What is AngleMetric used for? AngleMetric is used to measure the contact angle of liquid droplets on surfaces. This measurement provides insights into surface properties like hydrophobicity and surface energy, useful in scientific research, engineering, and education. ### How does AngleMetric work? The app uses your phone's camera to capture an image of a droplet. It then identifies the droplet's edge and fits it to theoretical curves to calculate the contact angle in degrees, displaying a live overlay of the fitted profile. ### What are the different measurement modes in AngleMetric? AngleMetric offers two primary modes: side-on for classic profile views of droplets, and top-down for flatter, more wetting drops where you input the volume to calculate the angle. ### Can I export my measurements from AngleMetric? Yes, AngleMetric allows you to save records of your measurements directly on your device. These records can be exported in CSV format for further analysis. ### What devices is AngleMetric compatible with? AngleMetric is supported on iPhone and iPod devices. Phones with ultra-wide angle lenses, such as iPhone 11+, are noted to image small droplets better. ### What is the pricing for AngleMetric? AngleMetric is free to try. A one-time Pro purchase or a monthly subscription removes limits, adds unlimited measurements, and enables saved records and exports. An Analytical Lab plan is also available for teams. ### How often is AngleMetric updated? The latest version of AngleMetric is 1.4.0, and it was last updated on August 18, 2026. This suggests regular updates to improve functionality and compatibility. ### What is the age rating for AngleMetric? AngleMetric has an age rating of 4+, making it suitable for a wide range of users, including children for educational purposes. ## Version history (last 2 releases) ### 1.41 — 2026-09-16 • Unlimited free measurements. Capture and save as many drops as you like, and view every record. • Introductory discount and 3 months free • Keeps measuring when no surface is detected • Quicker auto-capture. A small left/right angle difference no longer stops a capture. ASTM D8597 mode still enforces its 4° limit. ### 1.4.0 — 2026-08-18 No release notes. ## Apps similar to AngleMetric | App | Rating | Price | Category | | --- | --- | --- | --- | | [ColorCheck! - Extract average](https://appshunter.io/ios/app/colorcheck-extract-average/id6739463617) | — | Free | Utilities | | [Colorvalue - Get color values](https://appshunter.io/ios/app/colorvalue-get-color-values/id1280303223) | 4.5 (4) | Free | Utilities | | [Infimobile](https://appshunter.io/ios/app/infimobile/id6444329112) | 1.3 (39) | Free | Utilities | | [Total International](https://appshunter.io/ios/app/total-international/id1519491785) | 2.0 (24) | Free | Utilities | | [HANDYCUM](https://appshunter.io/ios/app/handycum/id6447970725) | 4.8 (110) | Free | Utilities | | [xWind](https://appshunter.io/ios/app/xwind/id1477120117) | 4.6 (550) | $0.99 | Utilities | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-18.*