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Screenshots

  • One Onsite screenshot 1
  • One Onsite screenshot 2
  • One Onsite screenshot 3
  • One Onsite screenshot 4

About One Onsite

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

Ratings & reviews

2.6

98 ratings

5 ★ 35% 4 ★ 1% 3 ★ 4% 2 ★ 6% 1 ★ 54%

What’s new

Version 4.4.9 · Updated September 22, 2026

• Improved work order check-in and ProCare workflows. • View customer WO details, special instructions, and attachments. • More flexible photo label selection during capture. • Added “Needs Assistance” for faster support escalation. • Improved scheduling, service history, notifications, and media uploads. • Fixed several issues with navigation, messaging, photo capture, and work order execution.

App privacy

The developer, SMS Assist, LLC., reported these privacy practices to Apple.

Data Not Linked to You

The following data, which may be collected but is not linked to your identity, may be used for the following purposes:

  • Diagnostics: Crash Data

Used for: Analytics

Alternatives to One Onsite

Looking for apps like One Onsite? Here are 6 similar apps on the App Store. The highest rated is Bluon HVAC (4.8/5), and all 6 are free to download.

One Onsite vs. alternatives
App Rating Price Last updated Compare
One Onsite 2.6 / 5 (98 ratings) Free September 22, 2026
CORE Service 3.6 / 5 (19) Free Oct 5, 2026 Compare
Affiliate Connect 3.4 / 5 (18) Free Sep 2, 2026 Compare
ServiceTitan Field 3.5 / 5 (5,435) Free Oct 27, 2026 Compare
HQx Live 2.9 / 5 (39) Free Jun 18, 2026 Compare
Azure ECM 3.5 / 5 (8) Free Oct 6, 2025 Compare
Bluon HVAC 4.8 / 5 (4,452) Free Oct 9, 2026 Compare

Compare One Onsite with the top alternatives: ratings, updates, ASO score and keyword gaps →