Bluon HVAC vs One Onsite
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Bluon HVAC
Access a vast database of HVAC models, manuals, and part lists to speed up your work. Utilize an AI-powered troubleshooting tool or connect with experienced technicians for real-time support.
- 500,000+ HVAC unit database
- Manuals and part lists
- AI troubleshooting tool (MasterMechanic)
- Live support from veteran techs
- HVAC industry upgrade tools
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Bluon provides the technical information and support to tackle any job in HVAC-R and plumbing. Scan or search for any unit to find the documentation on over 35,000,000+ HVAC models across virtual every brand. Instantly access the key model specs, age/warranty, manuals, original parts, part specs, and replacement options. See which suppliers carry which part - you can even text/email them or order directly through their website. Get detailed troubleshooting guidance from MasterMechanic, our custom A.l. built with the database and with the problem/solution knowledge of over 135,000 live support calls, or call our Live Tech Support line to connect to our team of 25+ year veteran technicians. Bluon has your back. App Features Include: - Database of 35,000,000+ HVAC units (manuals, specs and part lists) - Master Mechanic: leading A.I. tool for techs - Live Support line: talk to REAL veteran techs to solve problems in the field!
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: Bluon HVAC at 4.8 against One Onsite's 2.5. Bluon HVAC also leads on review sentiment (55% vs 23%) and ratings volume (4.5K vs 98). One Onsite's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, update cadence, 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.
Bluon HVAC holds the better App Store score, 4.8 against 2.5. That said, the two scores are not equally well evidenced: Bluon HVAC has 4.5K ratings behind it against 98, so its average is the more settled of the two. Written reviews point the same way: 55% of Bluon HVAC's written reviews are positive against 23% of One Onsite's.
Bluon HVAC ships an update monthly, One Onsite every 5 weeks. Both last shipped on September 24, 2026.
| Parameter | Bluon HVAC | One Onsite |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4.5K ratings) — better | 2.5 (98 ratings) |
| Positive reviews | 55.0% of reviews — better | 23.1% of reviews |
| Number of ratings | 4.5K — better | 98 |
| Update frequency | Monthly — better | Every 5 weeks |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 170 MB | 117 MB |
| Age rating | 4+ | 4+ |
| Developer | Bluon, Inc. | SMS ASSIST, LLC |
Customer experience
Bluon HVAC
One Onsite
Bugs and requests
Bluon HVAC
Reported bugs
2 issues- Login/password reset issues
- Frequent crashes or loading problems
Requested features
3 requests- Individual technician subscription option
- More comprehensive coverage of HVAC equipment models
- Ability to access full manuals without restrictions
One Onsite
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Bluon HVAC
No in-app purchases
One Onsite
No in-app purchases
Questions
Is Bluon HVAC free?
Is One Onsite free?
Which has better reviews, Bluon HVAC or One Onsite?
Do Bluon HVAC or One Onsite have ads?
Which is updated more often, Bluon HVAC or One Onsite?
Other comparisons
