MMDG BLE vs SeeOnSea
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
MMDG BLE
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Marine Mobile Digital Gauges bluetooth low energy display application helps you to choose between different display variants: black gauges style(default) white gauges style black digital display white digital display Also new add ons for selecting measurement units for: GPS speed : km/h(default) or knots fuel consumption : l/h(default) or gal/h temperature: Celsius(default) or Fahrenheit You have enable bluetooth access and GPS speed to use all the features of this application. Known errors: 1. if there is no MMDG device connected and you try to connect to an unrecognised bluetooth device, the app will end. You need to stop the app and restart app. 2. if you try to connect to an MMDG which is not connected to the engine, the app will retry to connect but because there is no data coming from MMDG it will refresh after few seconds. As soon as connection is established correctly there is no known error. Please report in comments possible errors found.
SeeOnSea
Record and share observations of the marine world, including fauna, flora, and natural events. Enhance discoveries with a mini-wiki and explore various map layers. Offers offline mode and multi-language support for global usability.
- Public/private observation sharing
- 5 observation types (Fauna, Flora, etc.)
- Mini-wiki with additional info
- Intuitive search with seasonality
- Offline mode
- Multi-language support
- Multiple map layers
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Creation of public or private observations with possibility of adjustment for 24h in order to record the direction. Observations can be confirmed by anyone. Sharing private observations is reserved for a group or community for which they were made. SeeOnSea is worldwide usable, on all seas and oceans, and even on rivers and lakes. 5 types of observations are possible (that will be soon completed): - Fauna - Flora - Natural events - Human print (pollution, nets, containers, etc.) - Notable sites Our mini-wiki presents for each observation additional information with text and photos captured from Wikipedia or from one of our scientific partners. The search is intuitive with seasonality/dates and the possibility to select several types of observations. In addition to the basic functions, the concept includes: - An offline mode - A true multi language - An internal messaging - Multiple layers of presentation (relief, bathymetry, traffic, wrecks, protected areas, etc.) and many options to discover. A User Guide is directly accessible at the first login or in the menu. It is not mandatory to create an account to access the observation sharing map. Without account, access is done as "guest" ("Unknown" account) with some limited features but it is anyway possible to create and confirm observations. Many functions are being developed and will soon complete the current version. The goal is to show the wealth of our world by reaching out to as many people as possible to respect and protect it. Come and join us!
Screenshots
Verdict
The clearest difference is update cadence: SeeOnSea at every 3 weeks against MMDG BLE's every 3 months. MMDG BLE's advantage is iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support 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.
MMDG BLE ships an update every 3 months, SeeOnSea every 3 weeks. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.
| Parameter | MMDG BLE | SeeOnSea |
|---|---|---|
| Price | Free | Free |
| Positive reviews | β | 75.0% of reviews |
| Update frequency | Every 3 months | Every 3 weeks β better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | β | Free |
| Devices | iPhone, iPad, iPod β better | iPhone, iPod |
| Requires iOS | 13.0 β better | 15.6 |
| Further details β not scored | ||
| Size | 18 MB | 190 MB |
| Age rating | 4+ | 4+ |
| Developer | Stefan Boicu | SEEONSEA |
In-app purchases
MMDG BLE
No in-app purchases
SeeOnSea
No in-app purchases







