SSC Spring Engineering vs One Onsite
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SSC Spring Engineering
This utility app assists with spring engineering calculations, including conversions, new designs, and comparisons. It helps determine spring and drum specifications for various applications, such as rolling steel doors, and calculates lifting capacities.
- Spring conversion
- New spring engineering
- Drum specification comparison
- IPPT spring calculation
- Rolling steel door spring design
- Approximate pull calculation
- Maximum lift capacity determination
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Convert springs, engineer new springs, compare drum specifications, calculate springs by IPPT, design springs for rolling steel doors, calculate approximate pull, or determine the maximum lift a spring/drum can lift on any job at any time. Application developed by Service Spring Corporation - a leader in spring manufacturing and customer service in the overhead door industry.
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: SSC Spring Engineering at 4.6 against One Onsite's 2.5. SSC Spring Engineering also leads on review sentiment (50% vs 23%). One Onsite's advantage is update cadence (every 5 weeks vs every 6 months) and ratings volume (98 vs 26). 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.
SSC Spring Engineering holds the better App Store score, 4.6 against 2.5. Both are backed by a comparable volume of ratings — 26 and 98 respectively. Written reviews point the same way: 50% of SSC Spring Engineering's written reviews are positive against 23% of One Onsite's.
SSC Spring Engineering ships an update every 6 months, One Onsite every 5 weeks. The most recent releases landed on June 1, 2026 and September 24, 2026 respectively.
| Parameter | SSC Spring Engineering | One Onsite |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (26 ratings) — better | 2.5 (98 ratings) |
| Positive reviews | 50.0% of reviews — better | 23.1% of reviews |
| Number of ratings | 26 | 98 — better |
| Update frequency | Every 6 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 | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 38 MB | 117 MB |
| Age rating | 4+ | 4+ |
| Developer | Service Spring Corporation | SMS ASSIST, LLC |
Customer experience
SSC Spring Engineering
One Onsite
In-app purchases
SSC Spring Engineering
No in-app purchases
One Onsite
No in-app purchases
Questions
Is SSC Spring Engineering free?
Is One Onsite free?
Which has better reviews, SSC Spring Engineering or One Onsite?
Do SSC Spring Engineering or One Onsite have ads?
Which is updated more often, SSC Spring Engineering or One Onsite?
Other comparisons
