KD DFU vs Holyiot
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
Holyiot
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A device firmware upgrade application
Screenshots
Verdict
The clearest difference is update cadence: KD DFU at every 2 months against Holyiot's every 24 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.
KD DFU ships an update every 2 months, Holyiot every 24 months. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.
| Parameter | KD DFU | Holyiot |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months — better | Every 24 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 26 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Guangzhou Kuodao Internet of Things Technology Co., Ltd. | Shenzhen Hong yi yun jia technology Co.,LTD |
In-app purchases
KD DFU
No in-app purchases
Holyiot
No in-app purchases
