Qastor vs MMDG BLE
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Qastor
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Qastor is a professional marine navigation and pilotage tool for maritime pilots. It combines high-precision positioning, live AIS traffic, and detailed nautical charts to support safe passage through harbors, ports, and confined waters. Built for the demands of real-time pilotage, Qastor gives you the situational awareness you need, accurate vessel position and heading, under-keel clearance, predicted tracks, and berth approach information, all on a portable display you can bring aboard any ship. Key features: Real-time AIS display of surrounding vessel traffic High-accuracy GPS positioning and heading Detailed nautical charts with depth and tidal information Docking and berth approach support Route and passage planning Works offline, independent of the ship's own systems Trusted by marine pilots for navigation in some of the world's busiest ports and waterways.
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.
Screenshots
Verdict
The clearest difference is in-app purchases: MMDG BLE at none against Qastor's 3. MMDG BLE also leads on iOS requirement (13.0 vs 15.0). On price, update cadence, ads 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. Qastor sells 3 in-app purchases, starting at $619.00 per year. MMDG BLE asks for nothing beyond the download.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 23, 2026 and October 27, 2026 respectively.
| Parameter | Qastor | MMDG BLE |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 257 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Quality Positioning Services | Stefan Boicu |
In-app purchases
Qastor
- Navigation$619.001 Year
- Navigation + Docking$989.001 Year
- 14-day TrialFree
MMDG BLE
No in-app purchases









