ESA Instruments vs SPZ App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ESA Instruments
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ESA Instruments is the new App from Astra Yacht that transform your iPhone/iPad in a full function marine display. Connect ESA Instruments to an Astra Yacht GAMP (http://www.astrayacht.com/wp/en/shop/multiplexer-gamp-nmea-0183-esa/) and you can visualize every information coming from the boat instruments. Moreover, if you haven't any electronic instruments on board, you can use ESA Instruments App combined with the Astra Yacht box EBI. EBI has an internal GPS at high speed, and it's able to receive wind data directly from the most popular wind sensors both wired and wireless, and it can be connected to 4 other NMEA 0183 sensors (such as speed-depth sensor, electronic compass, AIS, wind sensor). Data from various sensors can be displayed via Wi-Fi directly on Apple devices through the App ESA Instruments that, in addition to the visualization of data in a very light and flexible way, allows you to easily calibrate your sensors thanks to a user friendly settings procedure. With ESA Instruments you can visualize data in various format: - page with a single data ; - page with two data; - page with tree data; - page with four data; - page with analog wind indicator; - page with GPS data; - page with graphic wind history (5', 10', 20' or 60' time period). in every page you can select the data you want to display in a very simple way.
SPZ App
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Introducing SPZ App Beta, your dedicated companion for diving adventures in Slovenia. Our app is crafted to cater specifically to the needs and interests of the Slovenian diving community, offering a range of features designed to enhance your underwater experiences. Key Features: Localized for Slovenia: Tailored content and features for Slovenian divers, ensuring a relevant and personalized experience. User Information: Manage your personal diving profile with ease. Keep track of your diving certifications, equipment, and history. Digital User Card: Carry your diving credentials digitally. Our user card feature keeps you dive-ready at all times. Diving Data Management: Log your dives with detailed information such as depth, location, duration, and more, creating a comprehensive dive history. Intuitive Navigation: User-friendly menus and interfaces make navigation through the app a breeze. Continuous Updates: As a beta version, we're committed to regularly updating the app with new features, enhancements, and support based on your feedback. Why SPZ App Beta? Slovenia-Centric: Focused on the unique aspects of diving in Slovenia, offering localized content and support. Secure and Reliable: Prioritizing your data's security with robust protection, allowing you to store your information with confidence. Community Driven: We value your input. Help us refine and perfect SPZ App Beta with your suggestions and experiences. Dive Deep into Slovenian Waters Whether you're a local diving enthusiast or exploring waters, SPZ App Beta is here to guide your journey. Document, plan, and connect with the Slovenian diving community through our app. Download now and embark on your next underwater adventure! Please Note: Currently, SPZ App Beta is designed to support only the Slovenian diving community. We're eager to hear from you to improve and potentially expand our services. Your feedback is crucial in this beta phase to help us develop an app that truly resonates with divers in Slovenia and beyond!
Screenshots
Verdict
The clearest difference is update cadence: SPZ App at every 2 months against ESA Instruments's every 6 months. SPZ App also leads on iOS requirement (13.0 vs 15.6). On price, ads, 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.
ESA Instruments ships an update every 6 months, SPZ App every 2 months. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.
| Parameter | ESA Instruments | SPZ App |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Astra Yacht | Andrej Flogie |
In-app purchases
ESA Instruments
No in-app purchases
SPZ App
No in-app purchases









