Storage Cleaner for Outlook.com & OneDrive: Free Up Microsoft Storage is a strong option, but it is not the right fit for everyone. Below are 10 alternatives compared on rating, install base, pricing and the use case each one actually wins on.
See exactly what's filling your Microsoft storage, and free up space across Outlook and OneDrive, without your emails or files ever leaving your device. Scan locally. Review first. Clean up only what you approve. Sound familiar? • "Your storage is full" warnings that won't go away • Can't send or receive email because storage is over quota • Deleted hundreds of emails but storage still shows full • OneDrive says it's full and you don't know what's using the space Storage Cleaner scans your Outlook mailbox, your OneDrive, and your Microsoft storage quota, then ranks cleanup opportunities by how much space they can free. Everything runs in your own browser, on your device. Your emails and files are not uploaded to our servers. Why deleting emails often doesn't help: Outlook attachments count toward the same Microsoft storage quota as OneDrive, and deleted items keep using space in Deleted Items and the recycle bin until they are emptied.
| Extension | Rating | Users | Pricing | Best for |
|---|---|---|---|---|
| Storage Cleaner for Outlook.com & OneDrive: Free Up Microsoft Storage (original) | 5.0 | 27 | Free | Free up Outlook.com and OneDrive storage: find and delete large attachments, files, and duplicates. Runs entirely on your device. |
| Apollo.io: Free B2B Phone Number & Email Finder | — | — | Free | Apollo enables users to find contact info, connect with buyers, track emails, and more for free. |
| mail.com MailCheck | 4.0 | 40K+ | Free | The safe way to access your personal mail. |
| Quillbot: AI Writing Assistant with Humanizer, Paraphraser & AI Detector | 4.7 | 5M+ | Free | Write better emails, essays and messages with Quillbot's Grammar Checker, Paraphrasing Tool, Generative AI, Summarizer and more! |
| DeepL: translate and write with AI | 4.7 | 4M+ | Free | Translate while you read and write with DeepL Translate, the world’s most accurate translator. |
| Mailtrack | 4.4 | 3M+ | Freemium | Salespeople and recruiters who need to know when an email was actually opened. |
| Google Mail Checker | 4.1 | 2M+ | Free | Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox. |
| HubSpot Sales | — | — | Free | Email tracking, CRM for Gmail, and sales productivity tools in your inbox |
| Email Finder by ContactOut – Email Lookup Tool | 4.4 | 600K+ | Free | Find emails for 75% of Linkedin or ANY website. Save profiles to CRM. Chatgpt comments & email writer. Trusted by 76% of Fortune500. |
| Fathom AI Note Taker for Google Meet | 4.9 | 500K+ | Free | Records, transcribes & summarizes meetings FREE |
| Email Finder by Snov.io | 4.9 | 400K+ | Free | Find email addresses on any website. Our Email Finder lets you collect leads and grow sales on the go. |
Apollo enables users to find contact info, connect with buyers, track emails, and more for free.
Why it replaces Storage Cleaner for Outlook.com & OneDrive: Free Up Microsoft Storage: Covers similar ground in the Email category: Apollo enables users to find contact info, connect with buyers, track emails, and more for free.
The safe way to access your personal mail.
Why it replaces Storage Cleaner for Outlook.com & OneDrive: Free Up Microsoft Storage: Covers similar ground in the Email category: The safe way to access your personal mail.
Write better emails, essays and messages with Quillbot's Grammar Checker, Paraphrasing Tool, Generative AI, Summarizer and more!
Why it replaces Storage Cleaner for Outlook.com & OneDrive: Free Up Microsoft Storage: Another popular Email extension: Write better emails, essays and messages with Quillbot's Grammar Checker, Paraphrasing Tool, Generative AI, Summarizer and more!
Translate while you read and write with DeepL Translate, the world’s most accurate translator.
Why it replaces Storage Cleaner for Outlook.com & OneDrive: Free Up Microsoft Storage: Another popular Email extension: Translate while you read and write with DeepL Translate, the world’s most accurate translator.
Read receipts and link tracking for Gmail.
Why it replaces Storage Cleaner for Outlook.com & OneDrive: Free Up Microsoft Storage: Another popular Email extension: Read receipts and link tracking for Gmail.
Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox.
Why it replaces Storage Cleaner for Outlook.com & OneDrive: Free Up Microsoft Storage: Another popular Email extension: Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox.
Email tracking, CRM for Gmail, and sales productivity tools in your inbox
Why it replaces Storage Cleaner for Outlook.com & OneDrive: Free Up Microsoft Storage: Another popular Email extension: Email tracking, CRM for Gmail, and sales productivity tools in your inbox
Find emails for 75% of Linkedin or ANY website. Save profiles to CRM. Chatgpt comments & email writer. Trusted by 76% of Fortune500.
Why it replaces Storage Cleaner for Outlook.com & OneDrive: Free Up Microsoft Storage: Another popular Email extension: Find emails for 75% of Linkedin or ANY website. Save profiles to CRM. Chatgpt comments & email writer. Trusted by 76% of Fortune500.
Records, transcribes & summarizes meetings FREE
Why it replaces Storage Cleaner for Outlook.com & OneDrive: Free Up Microsoft Storage: Another popular Email extension: Records, transcribes & summarizes meetings FREE
Find email addresses on any website. Our Email Finder lets you collect leads and grow sales on the go.
Why it replaces Storage Cleaner for Outlook.com & OneDrive: Free Up Microsoft Storage: Another popular Email extension: Find email addresses on any website. Our Email Finder lets you collect leads and grow sales on the go.
Direct comparisons with the extensions people weigh against it.
Apollo.io: Free B2B Phone Number & Email Finder is the closest match. Covers similar ground in the Email category: Apollo enables users to find contact info, connect with buyers, track emails, and more for free.
Yes — Apollo.io: Free B2B Phone Number & Email Finder, mail.com MailCheck, Quillbot: AI Writing Assistant with Humanizer, Paraphraser & AI Detector are free.
