GEM Client vs Opti Clinometer
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
GEM Client
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GEM Client is an all-in-one mobile client that includes Alert, Panic, and Check-In features that work in conjunction with Genasys' critical and emergency communication platform: GEM Enterprise, an emergency communications solution that is purchased by an organization to protect its employees, contractors, and visitors. The app functions only when you register with at least one organization using the GEM Enterprise solution that you wish to be associated with. The organization will inform you how to register. The Alert functionality provides rapid reception of multimedia emergency communications from the organization(s) security team(s), based on your location (subject to your approval to share location) and/or group membership. Upon receiving an alert, the app will attempt to vibrate your device and pop-up a full-screen view of the alert content. It can also optionally play an audible alert tone and read the message, subject to settings that you control. The organization may include a list of responses in the alert that you can activate to acknowledge reception. The Panic functionality allows you to provide instant status information to an organization's security team, using either a single button activation or selection from a list. At each activation your location is shared with the organization (subject to your approval). Panic can be enabled for only one organization at a time (usually your employer or a local authority). The Check-In functionality is used to provide periodic answers to questions to an organization's security team, such as a periodic lone-worker or remote check-in, or for health checks. Check-In can be enabled for only one organization at a time, and the organization has the ability to add or remove you from different check-in profiles at any time. The app will remind you when to check-in, and the organization may also send alerts to remind you to Check-In.
Opti Clinometer
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Opti Clinometer turns your iPhone into a precise field clinometer β a modern alternative to classic optical instruments. TWO MEASUREMENT MODES β’ Sight mode: hold the phone horizontally at eye level and aim along its top edge, like a classic clinometer. The right-hand end points at your target. β’ Camera mode: aim with the on-screen crosshair and read the slope to whatever you are looking at. SIMPLE BY DESIGN Tap the screen once β the reading freezes and is saved. Tap again to resume. That is the whole workflow. BUILT FOR REAL FIELD WORK β’ Rotating artificial horizon and bubble levels help you hold steady β’ Color-coded slope scale: green below 8%, yellow 8β15%, red above 15% β’ Optional measurement photos with a viewfinder HUD β’ Coordinates saved with measurements and a satellite map β’ Measurement history with notes and CSV export β’ Readings shown in both percent and degrees NO NONSENSE No ads, no accounts, no tracking. The app collects no data at all.
Screenshots
Verdict
The clearest difference is update cadence: Opti Clinometer at every 2 days against GEM Client's every 6 weeks. GEM Client's advantage is device support (4 vs 1) and iOS requirement (9.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
GEM Client ships an update every 6 weeks, Opti Clinometer every 2 days. The most recent releases landed on September 17, 2026 and August 21, 2026 respectively.
| Parameter | GEM Client | Opti Clinometer |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 weeks | Every 2 days β better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod, Apple Watch β better | iPhone |
| Requires iOS | 9.0 β better | 17.0 |
| Further details β not scored | ||
| Size | 30 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | GENASYS | Burak Kizilobek |
In-app purchases
GEM Client
No in-app purchases
Opti Clinometer
No in-app purchases





