CORE Service vs One Onsite
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CORE Service
This app provides a wireless interface for commercial HVAC technicians to control and service specific Lennox rooftop units. It offers guided setup, enhanced testing, and parameter configuration to streamline the service process.
- Wireless mobile service app
- Guided setup with progress indicators
- Enhanced test functionality
- Real-time sensor readings and trending
- Parameter configuration
- Exportable setup summaries
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This app is the interface for the Lennox® CORE Unit Controller in Model L (L*M), Enlight (L*T), Xion (L*X) and Strategos (S*H) Commercial Rooftop Units. You must be within 25ft of a unit to connect and utilize this app. The Lennox® CORE Control System reinvents the service process in the palm of your hand with a wireless mobile service app, making setup and service faster than ever before. This app is intended for commercial HVAC service technicians to interface with CORE Unit Controller equipped unitary packaged rooftop units. App Features: - Guided Setup with progress indicators, detailed help, and exportable summaries drive simple and trouble-free setup, reducing commissioning times over similar systems. - Enhanced Test Functionality provides real-time sensor readings, trending, and reports that enable easy troubleshooting. - Ability to set and configure parameters of the CORE Control System drive tailored sequences of operation and make the CORE Unit Controller the most flexible Lennox has to offer.
One Onsite
This app assists facilities maintenance technicians in completing work orders efficiently. It provides detailed information, guides users to locations, and streamlines data collection for back-office reporting. The application is designed for ease of use with minimal training required.
- View daily work orders
- Access issue and location details
- Review historical service information
- Guided task completion flow
- Offline and low-connectivity performance
- Faster data upload
- Battery optimization
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One Onsite by Lessen helps vendors and their technicians complete their facilities maintenance work orders successfully while collecting valuable information along the way. With One Onsite, technicians can see the work they need to do for the day, read through relevant information around the issue, location and historical work done while effectively executing their work on-site with minimal disruption. Some of the key features around this app include: · Guided – With its seamless flow, simple language and focus on one task at a time, One Onsite is simple for the technicians to understand, and they require minimal training to use the app · Informational – One Onsite provides information and photos around the work order, guides the technician to the location that they need to visit and provides relevant historical service information. It also helps the technicians understand what information needs to be provided to their back office based on the trade · Efficient – One Onsite boasts of a vastly improved tech stack from its predecessor with better performance in offline and low connectivity areas, faster upload times and greater battery optimization
Screenshots
Verdict
The clearest difference is rating: CORE Service at 3.6 against One Onsite's 2.5. One Onsite's advantage is review sentiment (23% vs 0%) and update cadence (every 5 weeks vs every 3 months). On price, ads, in-app purchases and monetization model 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.
CORE Service holds the better App Store score, 3.6 against 2.5. That said, the two scores are not equally well evidenced: One Onsite has 98 ratings behind it against 19, so its average is the more settled of the two. Written reviews complicate that: 0% of CORE Service's written reviews are positive against 23% of One Onsite's, so the app with the better star average is not the one people write more warmly about.
CORE Service ships an update every 3 months, One Onsite every 5 weeks. The most recent releases landed on August 15, 2026 and September 24, 2026 respectively.
| Parameter | CORE Service | One Onsite |
|---|---|---|
| Price | Free | Free |
| Rating | 3.6 (19 ratings) — better | 2.5 (98 ratings) |
| Positive reviews | 0.0% of reviews | 23.1% of reviews — better |
| Number of ratings | 19 | 98 — better |
| Update frequency | Every 3 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 46 MB | 117 MB |
| Age rating | 4+ | 4+ |
| Developer | Lennox Industries | SMS ASSIST, LLC |
Customer experience
CORE Service
One Onsite
In-app purchases
CORE Service
No in-app purchases
One Onsite
No in-app purchases
Questions
Is CORE Service free?
Is One Onsite free?
Which has better reviews, CORE Service or One Onsite?
Do CORE Service or One Onsite have ads?
Which is updated more often, CORE Service or One Onsite?
Other comparisons
