One Onsite

One Onsite

One Onsite by Lessen

90 ratings
24 reviews
Free

Details

  • Released
  • Updated
  • September 6, 2022
  • July 1, 2026
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About

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
Show original description

What's New in One Onsite

4.4.7

July 1, 2026

- Added asset location step and water heater inspection questions to plumbing PM workflow, including a high-temp safety alert. - Reactive Work Order Accelerator now supports Fire & Life Safety and Plumbing trades. - Added vendor dispatch reason at checkout. - Auto-selects "Additional Work Needed" on certain cancellations. - Optimized task scheduling and ProCare bundling. - Fixed duplicate checkout issues, visit progress loss, and Android camera failure with flashlight.

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User reviews

It never let me upload pictures

Doesn’t allow me to add pictures

Vendor Review

As a vendor this app is absolutely amazing. Lessen is head and shoulders above its competitors. Proud to be allied with them.

No error indication

Very hard to use

Employee of company that uses this app

It’s the worst app I’ve ever used on my phone. It freezes every job and I have to delete and redownload the app just to get it to work.

Horrible

One of if not the worst app I’ve ever used the amount of hoops I have to jump through to get stuff approved let alone paid is astronomically ridiculous if I could give zero stars I would

Developer apps

FAQ

What does the One Onsite app do?

One Onsite is designed to help facilities maintenance vendors and their technicians successfully complete work orders. It provides technicians with a clear view of their daily tasks, relevant information about each issue, and guides them to the correct location. The app also facilitates the collection of necessary data for back-office reporting.

What are the key features of One Onsite?

Key features include a guided, task-focused workflow that requires minimal training, access to detailed work order information and historical service data, location guidance, and improved performance in offline or low-connectivity areas. It also offers faster upload times and better battery optimization.

Is One Onsite free to use?

Based on the provided information, the application is available for free. There are no mentions of subscription fees, in-app purchases, or advertisements, suggesting it is a complimentary tool for its intended users.

Who is the target audience for One Onsite?

The app is specifically designed for technicians and vendors working in facilities maintenance. It aims to streamline their on-site operations, from understanding their daily tasks to accurately reporting on completed work, making it ideal for mobile workforces in this sector.