O&O Software is a German software company that develops system utilities and tools for Windows operating systems. The company offers products focused on disk defragmentation, system optimization, data recovery, and privacy protection for both individual users and businesses. Their software solutions are designed to help maintain and improve computer performance and data security.
O&O Software receives a mixed reception from users, with a significant number expressing dissatisfaction. While some customers appreciate the O&O RegEditor for its effectiveness in managing the registry, others report serious issues with the defragmentation software, citing long processing times and a lack of customizable settings.
Reviewers frequently mention frustrations with the helpdesk, noting difficulties in obtaining support and activation problems with licenses. Additionally, the SafeErase tool has been criticized for wiping essential settings, leading to a poor user experience. Although some users find the DiskImage tool satisfactory for backups, the recovery process is described as complicated and ineffective. Overall, the sentiment leans negative, reflecting widespread concerns about product reliability and customer support.
Summary generated with AI from recent reviews
Each source counts by its number of reviews. Only reviews written by people are scored.
| Source | Rating | Reviews | Weight | 6-mo | Fake risk |
|---|---|---|---|---|---|
Trustpilot Low volume · weighted down | 2.1 | 8 | 100% | ● Not enough data |
Monthly average rating from reviews written by people · latest review Jun 2025.
| Month | Average | Reviews |
|---|---|---|
| Jan 25 | 3.0 | 1 |
| Feb 25 | — | 0 |
| Mar 25 | — | 0 |
| Apr 25 | — | 0 |
| May 25 | — | 0 |
| Jun 25 | 1.0 | 1 |
Share of positive (4–5★) and negative (1–2★) reviews mentioning each topic · based on the 8 most recent reviews.
“It is the worst service from a helpdesk that I have had and I am disappointed after being a customer for years”
Same method for every company: overall rating, legitimacy checks, the average rating of reviews mentioning each area and the 6-month trend · Electronics & Technology.
| Company | Overall | Legit | Trend | Reviews |
|---|---|---|---|---|
 | 2.1 out of 5 (poor) | 67 out of 100 | — | 8 |
| 4.1 out of 5 (good) | 100 out of 100 | — | 1,060 | |
| 4.5 out of 5 (good) | 100 out of 100 | — | 1,060 | |
| 4.7 out of 5 (good) | 100 out of 100 | — | 1,000 | |
| 4.0 out of 5 (good) | 100 out of 100 | −1% | 1,000 |
Bottom line: O&O Software is #5 of 5 on overall rating in this group.
8 reviews of O&O Software. Filter by what matters to you.
An sich ist O&O Syspectr gut. Für die Sensoren Überwachung und Windows installation aus der Ferne reicht es. Nutze die Software seit 2022. Leider hört es hier auch auf. Software zu updaten ist kaum möglich. Es dauert mehrere Stunden bis ein Programm erfolgreich durchlief.
I bought their famous Defrag software and although I was happy with my purchase, a couple of things I very much dislike. - First of all, the software has no dark mode. Yes, the software that is supposed to run for HOURS, has no dark theme. Its mostly white. - Second, it does not know how to handle some files. Files that are being active written to or are being downloaded. Defrag just gets stuck at trying to move them, never actually completing them with 0% CPU usage. So you have to force kill the defragmentation software. That makes you worry about your data and system stability. - Next, their defragmentation modes are strange. Their names make no sense so I always kept looking up their definitions on their websites. They are: STEALTH, SPACE, COMPLETE/Name(or Access or Modified), SOLID/Complete(or Quick). They dont include simple descriptions of them in the software, you have to go to their website. So I click on my 1TB HDD and I click start. Fragmentation was 32%. By default it started SPACE. It had about 60GB free space. I left the machine running and returned like an hour later. The defragmentation was done. The fragmentation went from 32% to 36% .... I was confused. It failed at its basic task. Mind you I have no files bigger than 10GB. Apparently the default defrag mode is useless for me. This drive is used mainly for games so it should have all sorts of files. How is the user supposed to know that this mode does not care about big files? You provide no description in the software and the basic mode does almost nothing. How did it even increase the fragmentation? If I only want to defragment the fragmented files, which mode do I use? Also, your website describes these modes and their performance. The problem is they are separated into Solid, Stealth, Space and Complete-Methods. Where the heck does 'Solid/Complete' belong then? Why name it that way? - Lastly, their pricing model is awful for regular people. At the time of this review I had version 24. It costs 30€ to buy a license and its endless, except its only for version 24. They decide to slightly improve the software and bump up the version so you cant receive it as an upgrade and that makes your version obsolete. You have to pay 30€ for another version in order to received the updates. The thing is, THEY decide when to bump up the version, there is no guarantee you get years of updates. They nicely offer you the upgrade in your current version and tell you to pay for it. It's pretty lame to find out two months after your purchase that your version is obsolete and you need to pay another 30€ to get new features. I get that they need income for improving software but why not provide updates a couple of months from the day of purchase? So you get updates until you reach lets say 18months and then you can only use the version that was available at the time or pay the fee again to extend it for another 18months? I dislike this pricing model greatly. Im uninstalling this tool, since it has issue that wont be resolved unless I pay another 30€. I do want to thank this company for making many great free tools like ShutUp10++ or RegEditor that are very useful. I also own DiskImage tool from them but I havent used it much(although I should be making more backups). It however uses the same pricing model.
Quick answers to the questions people ask most.
O&O Software specializes in system utilities and security software for Windows computers. Their products include disk defragmentation tools, system optimization utilities, backup solutions, and privacy protection software.
You can reach O&O Software support through their website's contact form, email, or phone during business hours. They also provide comprehensive online documentation and FAQs for common issues.
Most O&O Software products support current and recent versions of Windows, typically Windows 10 and Windows 11. Check the specific system requirements for each product on their website to ensure compatibility with your operating system.
Yes, O&O Software offers free trial versions for most of their products, typically lasting 30 days. The trial versions allow you to test full functionality before making a purchase decision.
O&O Software typically offers a 30-day money-back guarantee on their products. If you're not satisfied with your purchase, you can request a refund within the specified timeframe according to their terms and conditions.
You can download O&O Software products directly from their official website. After purchase, you'll receive a license key via email to activate the full version of the software.
Yes, O&O Software provides volume licensing options for businesses and organizations. They offer special pricing and licensing terms for multiple installations, which can be discussed with their sales team.
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O&O Software regularly releases updates to improve functionality, fix bugs, and ensure compatibility with new Windows versions. Most products include free updates during the license period, with major version upgrades available for purchase.
Yes, O&O Software is a reputable German company that develops legitimate system utilities. Their products are digitally signed and regularly tested to ensure they're free from malware and safe for your computer.
O&O Software is a German software company that develops system utilities and tools for Windows operating systems. The company offers products focused on disk defragmentation, system optimization, data recovery, and privacy protection for both individual users and businesses. Their software solutions are designed to help maintain and improve computer performance and data security.
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