Apogee controller vs EGD2021
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Apogee controller
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Apogee controller app. Allows user to configure and control the Apogee power distribution and control system.
EGD2021
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This version of the app is written by Lam Yeung Shun under the supervision of Dr. Shiu Yin Yuen. The application will act as a guide dog, as an auxiliary tool to guide the visually impaired people (VIP) to the destination in both indoor and outdoor environments. Under the guidance of the navigation, the VIP can easily follow the instructions from the recorded path. The path can be recorded by themselves or received from other users.
Screenshots
Verdict
The clearest difference is update cadence: Apogee controller at every 5 weeks against EGD2021's every 25 months. 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.
Apogee controller ships an update every 5 weeks, EGD2021 every 25 months. The most recent releases landed on October 9, 2026 and October 3, 2026 respectively.
| Parameter | Apogee controller | EGD2021 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 weeks — better | Every 25 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Arboreal Systems | Shiu Yin Yuen |
In-app purchases
Apogee controller
No in-app purchases
EGD2021
No in-app purchases
