RTB BLX vs EGD2021
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RTB BLX
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BLX Service is an app used for configuring and managing Bluetooth-equipped traffic assistive devices from RTB.
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: RTB BLX at every 7 months against EGD2021's every 25 months. EGD2021's advantage is iOS requirement (14.0 vs 16.6). 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.
RTB BLX ships an update every 7 months, EGD2021 every 25 months. The most recent releases landed on October 11, 2026 and October 3, 2026 respectively.
| Parameter | RTB BLX | EGD2021 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 7 months — better | Every 25 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 35 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | RTB Elektronik | Shiu Yin Yuen |
In-app purchases
RTB BLX
No in-app purchases
EGD2021
No in-app purchases
