RRTool vs Holyiot
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RRTool
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RRTool is the extended features companion app to your RR1090 digital refractometer and similar Bay Area Instruments devices. It communicates via encrypted BLE with your device, mirroring its buttons and providing extended functionalities such as: cloud spreadsheet logging of your measurements, enabling of ATC for Brix, QR code generation and device firmware upgrades.
Holyiot
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A device firmware upgrade application
Screenshots
Verdict
The clearest difference is update cadence: RRTool at every 4 months against Holyiot's every 24 months. Holyiot's advantage is iOS requirement (12.0 vs 14.0). 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.
RRTool ships an update every 4 months, Holyiot every 24 months. The most recent releases landed on November 7, 2026 and October 7, 2026 respectively.
| Parameter | RRTool | Holyiot |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months — better | Every 24 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Bay Area Instruments Inc. | Shenzhen Hong yi yun jia technology Co.,LTD |
In-app purchases
RRTool
No in-app purchases
Holyiot
No in-app purchases
