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Top-15 PC repair apps in review

Vitaliy Shychenko

A leading software analyst in security, PC optimization and utilities.


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The cause of PC performance deterioration often is not that obvious. The main concept behind niche PC repair apps / software is to solve this riddle, i.e. the widest possible range of issues. The arsenal includes startup optimization, deleting system junk files, fixing registry issues, accelerating hardware, updating drivers, etc.  

Since we have previously reviewed the best PC optimizers and registry cleaners, we’ll focus on applications combining all of the above. Our goal is not to bore a  reader with lengthy descriptions, rather to present crucial facts and features of PC repair software. That’s why we’ll start right away with comparison tables for key facts, functions and performance. 

PC repair software comparison

Note that the older a Windows is, the more it may need to be taken care of. We are talking about Windows XP and 7, as Windows 10 already has tools to scan and fix all sorts of issues. Microsoft itself offers a free utility for removing temporary and residual files – Total PC Cleaner. Unfortunately, it did not make it to our list due to its modest potential. 

We’ve compared over a dozen of popular PC repair apps in an unbiased way using a virtual machine to test them all out. We’ve used a vintage but still well-running laptop on Windows 10. Note: all data in the following tables is relevant as of September 2020.

PC repair tools comparison: Basics
Product Size / Mb Free version Trial / days Pro / year Languages
Advanced SystemCare 165 $20 47
Advanced System Optimizer 80 1 $53 14
BoostSpeed 128 $17 7
CCleaner 59 14 $20 57
CleanMyPC 49 $40 11
Defencebyte 5 15 $39 1
Glary Utilities 56 $20 42
PC Cleaner 17 $46 17
Razer Cortex 218 9
System Mechanic 128 30 $40 10
System Speed Up 92 30 $20 13
Tron Script 662 1
Tune Up 220 60 $42 24
WinOptimizer 72 10 $20 25
Wise Care 365 49 $30 40

As we see, most programs provide a basic free version, and Pro plans range from $20 to $50 per year. Now, let’s look at essential features of selected PC repair utilities, e.g. junk removal, registry fix, RAM boost, driver updates. 

Cleaning and optimizing options
Product System junk cleaning Registry cleaning RAM / CPU boost Startup optimizer Drivers fix
Advanced SystemCare Pro
Advanced System Optimizer Manual
BoostSpeed Pro
CCleaner Manual
CleanMyPC Manual
Defencebyte Manual
Glary Utilities Manual
PC Cleaner Pro Manual Pro
Razer Cortex
System Mechanic Manual Manual
System Speed Up
Tron Script
Tune Up
Wise Care 365 Pro Manual

Literally all 15 apps take care of junk and registry, while other functions differ. There may be many additional features too. For the next table we’ve taken into account the most significant ones, i.e. backup tool, uninstaller, software updater, password manager and anti-malware protection.

Security and extra options
Product Backup manager Uninstaller Software updater Password manager Antimalware
Advanced SystemCare Pro
Advanced System Optimizer
BoostSpeed Pro
Glary Utilities
PC Cleaner Pro
Razer Cortex
System Mechanic
System Speed Up
Tron Script
Tune Up
Wise Care 365

Finally, the central part: effectiveness in practice. All the data was obtained by using free or trial versions in the same environment over and over again. We tested both detection (invalid shortcuts, security issues, etc.) and repair capabilities (freed space, registry issues fixed). 

Product Freed memory / GB Registry issues Startup items Invalid shortcuts Privacy issues Security issues
Advanced SystemCare 3.10 1189 8 138 1106 3
Advanced System Optimizer 1.89 495 65 786
BoostSpeed 2.47 277 2 210
CCleaner 4.05 523 540 3
CleanMyPC 2.09 470
Defencebyte 1.53 898
Glary Utilities 2.13 152 148
PC Cleaner 2.11 1279 10 117 1
Razer Cortex 3.03
System Mechanic 2.05 155 10
System Speed Up 4.60 464 3 87
Tron Script 4.07 523 540 12
Tune Up 3.95 530 10 1318
WinOptimizer 2.84 612 51
Wise Care 365 3.02 1266 1

We excluded files in the Recycle bin, since this is not the type of files that we would like to delete. Also, we did not take into account the memory freed as a result of clearing cache and passwords inside a web browser, since this is optional. Yet, it is worth remembering that these numbers do not necessarily point to clear conclusions about efficiency. Therefore, we have to describe each of these PC repair apps, extracting core details and forming pros and cons.

Top-15 PC repair apps

Once again, we underscore that one has to be extremely cautious because there are many fraudulent offers pretending to be the best and omnipotent repair applications. In fact, this type of software has a small impact on PC performance at best.

OS: Windows XP, Vista, 7, 8, 10.
License: freeware, paid subscription.
Developer: iObit, CA, US.

free PC repair apps

Advanced SystemCare is a multifunctional application developed by the highly promising IObit team. It comes both in free and Pro versions. In addition to the basics, it contains anti-spyware and anti-tracking systems, ad blocker and more. It offers full automation of computer monitoring. Read the full review on Advanced System Care for more details. 


  • slight difference in functionality between Free and Pro
  • automation (one-click scan)
  • high-level performance in most sectors


  • mediocre in freeing up disk space (free version)
  • frequent ads of other IObit products
  • resource-intensive background work

OS: Windows HP, Vista, 7, 8, 10.
License: paid subscription, free trial.
Developer: Systweak Software, India.

Advanced System Optimizer

Since 2002 the program has been regularly improving and expanding. It can work in the background mode and brings features for gaming optimization. The Privacy Protector module proves to be one of the best among all PC repair apps on the list. As a whole, this app leaves an ambiguous impression. On one hand, it is flagged as malware, yet on the other hand, it performs its tasks well. One sure tip is to use each tool separately instead of a quick scan.


  • decent optimization and protection
  • a wide range of functions
  • a clear structure and navigation


  • lengthy full scan
  • listed as PUP by various antivirus apps
  • poor junk files cleaning
03 of 15


OS: Windows 7, 8, 10.
License: freeware.
Developer: Auslogics, Australia.

PC repair software

Not promising much, unlike other vendors, BoostSpeed ​​has a range of basic options for computer maintenance. A browser assistant, antivirus, disk defragmentation, tools. In general, it resembles a web browser, which isn’t bad, and there are no ads or unauthorized opening of pages. Find out more in Auslogics BoostSpeed 11 review.


  • true to vendor description
  • multiple functions covering many aspects
  • no annoying ads


  • mediocre performance
  • lack of protection tools in the free version
  • navigation may feel complicated
04 of 15


OS: Windows 7, 8, 10; MacOS.
License: freeware, paid subscription.
Developer: Piriform, LTD, United Kingdom.

can i use Ccleaner to repair my PC?

More focused on cleaning (deleting junk and cache) rather than computer repair, CCleaner proves to be really effective. It was once again demonstrated in our brief testing, in terms of registry especially. Thus, we recommend pairing it with other software to set up cleaning, optimizing and protection procedures. The Privacy Issues Search function still is enough for basic needs.


  • fast scanning and cleaning
  • finds more junk compared to other apps
  • informative scans and manual selection of files


  • limited trial version
  • no full system scan in one click
  • some versions are bundled with suspicious apps
05 of 15


OS: Windows 7, 8, 10, macOS.
License: freeware, paid subscription.
Developer: MacPaw, Ukraine.

how to remove junk files

CleanMyPc is a straightforward utility with a free version that covers system cleaning, registry check, managing Windows startup, etc. It is primarily designed for macOS, while the  Windows version is more of a side gig. It feels unfinished.


  • an excellent version for macOS
  • nice design and UX
  • low resource consumption


  • a few repair options only
  • slight effect on computer health
  • high price
06 of 15


OS: Windows XP, Vista, 7, 8, 10.
License: paid subscription, free trial.
Developer: Defencebyte, Australia.

how to optimize my windows pc

Computer Optimizer by Defencebyte is a minimalist utility: a single-click scan and removal of temp files, cleaning registry afterwards. Defencebyte is primarily known for its antivirus products, which perfectly complement this app. You can choose between 1 or 3 devices tariffs.


  • good results of registry cleaning
  • simple design
  • proper technical support


  • small number of functions
  • short trial period
  • below average test performance

OS: Windows XP, Vista, 7, 8, 10.
License: freeware, paid subscription.
Developer: Glarysoft, Ltd., China.

PC optimization apps

Despite the unadorned design, Glary Utilities copes with basic PC repair tasks. Along with cleaning and optimizing, it offers driver fixing, defragmentation. It is an ascetic application, one might say, able to work both in window and a background mode.


  • a wide range of functions for all areas
  • reasonable price


  • some tools work slowly and detect issues poorly
  • mediocre results in freeing up disk space
08 of 15

PC Cleaner

OS: Windows XP, Vista, 7, 8, 10.
License: freeware, paid subscription.
Developer: Helpsoft, Canada, BC.

how to delete invalid shortcuts

Except for a controversial registry cleaning, PC Cleaner by Helpsoft consists of a basic set of tools endorsed by Microsoft. This could be perceived both as good and a bad thing, of course. As a computer optimizer tool it performs well, but it is not sufficient for protection or for complex system care.


  • friendly UI
  • the best results in regards to registry issues
  • light on system resources


  • confusing random scans
  • a limited number of functions
  • often flagged as PUP by anti-malware

OS: Windows Vista, 7, 8, 10.
License: freeware.
Developer: Razer, Inc., CA, US.

optimize pc for gaming

A niche application geared towards optimizing computers for smooth gaming performance. Razer Cortex tools focus on reducing CPU and RAM load, and cope with the task quite well. It can increase the FPS rate and accelerate Windows boot. It has two modes of operation: 1-click optimization and background process during gaming.


  • truly optimizing the OS while gaming
  • pleasant visual design
  • free of charge and no attempts to push the purchase


  • not a good choice for system repair
  • difficult to see the exact impact on RAM and CPU
  • may require constant Internet connection

OS: Windows 7, 8, 10.
License: Paid subscription.
Developer: iolo technologies LLC, US, CA.

is iolo system mechanic any good

iolo System mechanic is one of the veterans among PC repair apps. Deep scan allows users to delete junk files, including browser cache, defragment the CDM, clear registry, optimize OS startup. The app may seem overwhelming at first (no light theme also doesn’t help) yet with each launch it will be ok. Read more in our System Mechanic review.


  • pretty nice UI
  • a range of useful options
  • effective sectoral scanning


  • automatic scanning even when it is disabled
  • lack of selective troubleshooting
  • high pricing

OS: Windows 7, 8, 10, macOS, Android.
License: Paid subscription, free trial.
Developer: Avira Operations GmbH & Co. KG, Germany.

how to free up disk space

With a diverse Avira client you are free to choose which tools to use. In terms of our topic we have to study a tool called System Speedup. It is actually designed in such a way that a user of absolutely any skill can perform tasks in just a few clicks.


  • nice program structure
  • additional tools besides speed-up
  • actual new disk space after running the app


  • many components are not free
  • complicated access to trial
  • mediocre results in defragmenting
12 of 15

Tron Script

OS: Windows XP, Vista, 7, 8, 10.
License: freeware, open-source.
Developer: Vocatus, N/A.

open source pc repair utility

Probably, the most controversial utility on our list. In fact, Tron Script is an open-source project created by a single user and maintained by the community on Reddit, GitHub, and Quora. It actually is not a program at all but a set of scripts, launching a bunch of apps (Windows tools, CCleaner, Malwarebytes, KVRT, USB device security, McAfee, etc.) and removing it all after the use. It has no interface, being executed as a command line.


  • top-notch issue detection
  • customize and edit the changes
  • constant collective development


  • requires certain computer skills
  • slow scanning and repair speed (20 hours and 3 restarts)
13 of 15


OS: Windows 7, 8, 10, macOS, Android, iOS.
License: paid subscription.
Developer: AVG Technologies, Avast, Czech Republic.

is TuneUp by Avast free?

AVG TuneUp helps to maintain the life of old computers, but not only. Developed by Avast, the same vendor that had introduced CCleaner. Trial version allows scanning a PC yet to fix issues, a verification and a credit card number is required, meaning one becomes a paying customer already. Often, such a tactic is a marker of so-called scareware. In all other aspects, the app is typical.


  • clean, optimize, fix system problems
  • few-clicks workflow
  • compatible with different OS versions


  • distributed with the antivirus only
  • no trial without providing payment info
  • high price

OS: Windows 7, 8, 10.
License: Paid subscription, free trial.
Developer: Ashampoo GmbH & Co. KG, Germany.

PC repair software

WinOptimizer simplifies many actions to take care of computers. It has both one-click scanning and sector-specific problem fixing, both basic and advanced tools in its trial version, which is definitely an advantage; both window and background mode. Anti-tracking and protection systems are a fine addition too.


  • multiple useful tools
  • plain yet pleasant design
  • informative scan results


  • after a scan, the app removed system restore points
  • heavy on PC resources

OS: Windows XP, Vista, 7, 8, 10.
License: freeware, paid subscription.
Developer: WiseCleaner, China.

free PC repair utility

Wise Care 365 is a set of useful small utilities. The results of our in-house tests were solid, as well as the overall impression. Except usual mode, there’s a Wise mode, which sends the application to the tray but still working. The active customer support, replying faster and more attentively than other companies, is a big plus.


  • Pro version is packed with features
  • friendly interface
  • RAM booster and startup manager actually help


  • looks outdated per today’s standards
  • most tools are in Pro exclusively
  • lack of security tools

P.S. How to repair a computer with Windows tools?

One can also fix a computer manually, without resorting to third-party solutions. Before making any changes to the system, we recommend creating a system restore point to safeguard against irreparable consequences that may or may not occur.

Step 1: Manual deletion of unnecessary files. You can safely delete almost all files into the recycle bin, revise the Downloads folder.

Step 2: Enable or disable automatic Windows updates according to your preferences. Look up the status of Windows Updater in the list of services.

Step 3: Disable unnecessary processes in the task manager, e.g. processes that Windows does not require or you do not use every day. Also, you can turn off some basic applications from Microsoft, for example, OneDrive.

Step 4: Clean disk space, delete each needless file you don’t need and use.

Step 5: For Windows 10, use the built-in utilities to defragment disks, clean superfluous files inside the system, and other utilities recommended by Microsoft.

Step 6: Scan a computer with an antivirus after the aforementioned steps.

Step 7 (optional): Try to reinstall Windows saving all personal files on removable media or a cloud service beforehand. If nothing changes in terms of poor performance, maybe it is time to upgrade hardware.

Read next: Best PC optimization software.

About author

Vitaliy Shychenko
Vitaliy Shychenko

A leading software analyst in security, PC optimization and utilities.

Vitaliy Shychenko is engaged in a fully-fledged software research, performance testing, market research, business R&D. He explores interfaces for convenience and practicality for end-customers. Vitaliy is actively developing modern testing methods for antiviruses, anti-malware, video editors & converter apps, uninstallers, based on scientific analysis and the “level playing field” principle.