KfB Install vs SI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KfB Install
This app enables technicians to install and maintain smart access devices for residential buildings. It facilitates controlled entry for delivery drivers, streamlining package delivery and reducing building staff involvement. The system ensures secure, one-time access after multi-step driver authentication.
- Device installation and maintenance
- Controlled access for delivery drivers
- Integration with existing access systems
- Multi-step driver authentication
- Package delivery facilitation
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This mobile application is specifically designated for Key for Business technicians to install and maintain Key for Business devices. Key for Business allows residential building owners and managers to give controlled access to Amazon delivery drivers to drop off packages to their residents without the need for help from building staff. This aims to reduce the time spent by delivery drivers waiting for access into the building and eliminates the need for building staff to manually give access to drivers each time deliveries are made. Once an agreement with the property owner or manager is complete, Amazon installs a device that integrates seamlessly with your building’s existing access control system to enable Key for Business. A multi-step authentication process then confirms each delivery driver’s identity before permitting one-time access to your property to deliver your resident’s packages. Learn more: www.amazon.com/keyforbusiness
SI
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SI Field is the official mobile app for Sensor Industries customers and field technicians, putting real-time sensor management in the palm of your hand. WORK ORDERS — FOR PROPERTY STAFF Stay on top of every open maintenance request at your property. View work order details, add timestamped notes, select completed action and cause, and close out jobs — all from your phone, without logging into a desktop dashboard. SENSOR INSTALLATIONS — FOR TECHNICIANS Sensor Industries technicians and contracted installers can follow a guided, step-by-step installation workflow: - Browse properties and select the target unit and slot - Scan or enter a device serial number for instant validation - Create the sensor assignment directly from the field - Run a live device health check to confirm the sensor is communicating - Capture and upload install photos - Review the completed assignment before leaving the site OFFLINE-FIRST SYNC No signal? No problem. Completed installs are saved locally and automatically synced when connectivity is restored. SI Field requires a valid Sensor Industries account. Contact Sensor Industries to get access.
Screenshots
Verdict
The clearest difference is update cadence: SI at every 3 days against KfB Install's every 6 weeks. 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.
KfB Install ships an update every 6 weeks, SI every 3 days. The most recent releases landed on October 23, 2026 and September 11, 2026 respectively.
| Parameter | KfB Install | SI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (14 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 14 — better | — |
| Update frequency | Every 6 weeks | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 109 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | AMZN Mobile LLC | Sensor Industries |
In-app purchases
KfB Install
No in-app purchases
SI
No in-app purchases









