KD DFU vs VSG101 Update
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KD DFU
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A utility to do the door lock firmware upgrade
VSG101 Update
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Update the VSG101 firmware tools
Screenshots
Verdict
The clearest difference is iOS requirement: KD DFU at 12.0 against VSG101 Update's 16.6. On price, update cadence, ads and in-app purchases 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.
KD DFU ships an update every 2 months, VSG101 Update every 5 weeks. The most recent releases landed on September 26, 2026 and October 1, 2026 respectively.
| Parameter | KD DFU | VSG101 Update |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 26 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Guangzhou Kuodao Internet of Things Technology Co., Ltd. | VITALSIGNS TECHNOLOGY CO., LTD. |
In-app purchases
KD DFU
No in-app purchases
VSG101 Update
No in-app purchases
