Avast Cleanup Premium 21.4 Build 11223 is not a revolutionary product, but it is an exceptionally polished one. It successfully automates the boring, repetitive tasks of PC maintenance—cleaning temp files, updating software, disabling bloatware, and hibernating runaway processes—while keeping safety rails firmly in place.
The build’s improvements over earlier versions (better browser cleaning, improved sleep mode reliability, and fewer false positives) show that Avast is listening to user feedback. It does not promise to turn a 10-year-old Pentium into a gaming rig, but it will make that same Pentium boot faster, run cooler, and crash less often.
For the average user, the $39.99 annual subscription is justifiable if you value time and convenience over manual tinkering. For power users, it’s a convenient backup tool for cleaning client PCs or family machines.
Rating: 4.2 / 5
Deducted 0.8 for the persistent upsells and background resource usage.
Last tested: November 2021 on Windows 10 21H2 and Windows 11 RTM. Avast Cleanup Premium 21.4 Build 11223 remains stable and effective as of this write-up, though newer builds (22.x and 23.x) have since introduced additional features like disk defragmentation and driver updater.
This build is not just a simple "disk cleaner." It is a suite of tools designed to breathe new life into aging hardware. Here are the core modules: Avast Cleanup Premium 21.4 Build 11223
How does Build 11223 stack up against its peers?
| Feature | Avast Cleanup Premium | CCleaner Professional | Iolo System Mechanic | Glary Utilities Pro | |---------|----------------------|----------------------|----------------------|----------------------| | One-click maintenance | ✅ | ✅ | ✅ | ✅ | | Startup delay | ✅ | ❌ | ✅ | ❌ | | Software updater | ✅ (150+ apps) | ❌ | ✅ (limited) | ✅ (limited) | | Sleep Mode | ✅ | ❌ | ❌ | ❌ | | Registry backup before cleanup | ✅ | ✅ | ✅ | ✅ | | Real-time monitoring | ✅ (free version shows ads) | ❌ | ✅ | ❌ | | Price (annual, 1 PC) | $39.99 | $29.95 | $49.95 | $29.95 |
Verdict: Avast leads in automation (Sleep Mode, delayed startup) and safety features, while CCleaner is lighter but less intelligent. System Mechanic offers deeper tweaks but is more technical.
The "Speed Up" tab houses two powerful tools:
Startup Manager – Provides a clear, color-coded list of all applications that launch with Windows. Each entry shows: Avast Cleanup Premium 21
Unlike Windows’ native Task Manager, Avast offers delayed start—a brilliant feature that staggers non-critical apps 30–60 seconds after login, reducing boot contention.
Background & Bloatware Manager – Scans for resource-heavy processes (high RAM/CPU/disk usage) and categorizes them as “Essential,” “Optional,” or “Bloatware.” It suggests disabling pre-installed manufacturer utilities (e.g., Dell SupportAssist remnants, HP JumpStart) that run invisibly.
How does this older build stack up against modern alternatives?
| Feature | Build 21.4.11223 | Latest Build (2026) | |---------|------------------|---------------------| | Resource usage | Light (50 MB RAM) | Heavy (120 MB RAM) | | Windows 11 optimization | Limited | Full | | Subscription model | Perpetual (if bought) | Mandatory yearly | | Telemetry | Minimal | Extensive |
Many power users actively downgrade to Build 11223 because it lacks the aggressive cross-selling pop-ups found in newer versions. It runs quietly in the background without constantly asking you to "upgrade to Ultimate." Last tested: November 2021 on Windows 10 21H2
| Problem | Solution | |--------|----------| | Activation fails | Check internet connection; re-enter code; ensure date/time is correct. | | Scan hangs | Restart Avast Cleanup or reboot PC. Run as Administrator. | | “Not responding” | Reinstall the software (keep license info). | | Registry cleaner freezes | Skip large registry hives; run in Safe Mode. | | Sleep Mode not working | Check Windows services → ensure “Avast Cleanup Service” is running. |
While Windows has a built-in Disk Cleanup, Avast’s version in 21.4.11223 goes deeper. It cleans:
Note for build 11223: Unlike later 22.x builds, this version does not forcibly remove browser login sessions by default—a user-friendly touch.
Avast Cleanup Premium is a system maintenance tool designed to automate the tedious process of cleaning and optimizing a Windows PC. The specific build 21.4.11223 (released in mid-2021) represents a mature iteration of the software, known for being free from some of the early bugs of the 21.x series while introducing refined algorithms for deep cleaning and sleep mode.
Unlike the free version of Avast Antivirus, this premium tool focuses exclusively on performance—not security. It targets: