One Onsite

2.9
76 reviews
Content rating
Everyone
10K+
Downloads
Content rating
Everyone
Learn more
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About this app

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
Updated on
Mar 20, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Photos and videos
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

2.9
71 reviews
Cevin Ladd
January 9, 2025
I Use the app for facilities maintenance work. App crashes frequently. I have lost many service pictures that I'm required to upload to complete a service due to this issue. Unable to get them back as they're taken exclusively in the app and don't download to your phone. The app also crashes frequently in the background even when not in use and tanks battery life and processing power on my phone. All in all needs a SERIOUS overhaul. Exclusively use it because I'm required to for work. Terrible
7 people found this review helpful
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Thomas Lofton
June 28, 2024
New update ruined this app. Now when going from taking a picture of the location it goes straight into additional pictures and not before service picture. Meaning I have to completely back out of the job and go back in to try and get the option to even appear. And sometimes it deletes the pictures when I back out. So now instead of getting work done I'm sitting here trying to figure out how to make the app do what it's supposed to.
14 people found this review helpful
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Lessen, LLC
November 26, 2024
Hi Thomas, We regret that you have not had a good experience using the One Onsite app. We are committed to hearing your feedback and improving the app. Please reach out to the affiliate marketing manager you work with and they will set up a call to address these issues. Looking forward to hearing from you soon. Sincerely, One Onsite Team
J. L. Contracting
November 26, 2025
I'd like to rate this app but apparently it wants to take it's time downloading to my phone because all I got after a couple of hours was it will be installed soon. Basically this app right now is holding me up from going to work and making some money for people. Did you catch that whoever created this app? This app is holding me up from making money. There should be a less than one star rating option. *EDIT* A full day has passed and it still hasn't installed. I will not be using it. It's trash
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What’s new

Enhanced non-reactive task configuration, including dropdowns and unique links for air filter tasks.
Improved multi-asset replacement with bulk deactivation, duplicate prevention, and validation checks.
Added plumbing PM workflows for water heater and general equipment inspection.
Resolved work order issues: status update bug, step display, deferred access, and missed recurring rescheduling.
Optimized photo compression and streamlined asset creation for improved efficiency.