Supported Features
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VoiceOver
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Voice Control
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Larger Text
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Dark Interface
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Differentiate Without Color Alone
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Sufficient Contrast
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Reduced Motion
Secret Inbox
Your Masked Email for Fastmail
Free
A smarter privacy layer for Fastmail. Spin up masked emails in seconds, shut down spam, and keep your real address off the grid.
Secret Inbox is the native companion app for managing your Fastmail masked email addresses on iPhone, iPad, and Mac.
Stop giving away your real email address. Create a unique masked email for every website, newsletter, or service you sign up for. When one gets spammed, simply block or delete it — your real inbox stays clean.
Create Emails Instantly
∙ Generate new masked emails with a single tap/click. Add custom domains and descriptions to stay organized. Copy any address to your clipboard and paste it wherever you need.
Manage Your Privacy
∙ View all your masked emails in one place. Block addresses that receive spam without deleting them. Bulk select and delete multiple emails at once when you're ready to clean house.
Built for Speed
∙ Lock Screen widget to copy emails without opening the app
∙ Siri Shortcuts: "Hey Siri, create a new masked email"
∙ Mac keyboard shortcuts for instant creation (customizable)
∙ Menu bar access on Mac for quick lookups
Search Your Mail
∙ Tap any masked email to search your Fastmail inbox for messages sent to that address. See exactly what's coming through.
Fully Accessible
∙ Complete VoiceOver support with descriptive labels, state announcements, and reduced motion options.
Your Data Stays Private
∙ Secure OAuth login directly with Fastmail. No third-party tracking. No data collection. Your credentials are stored safely in your device's keychain.
Requires a Fastmail account with masked email feature.
• Added full multi-profile support so you can use and switch between multiple Fastmail accounts in Secret Inbox.
• Added a new Manage Profiles flow where you can add, rename, switch, and remove profiles.
• Added profile switching in the Safari extension popup so you can create and fill addresses from the correct account.
• Added keyboard shortcuts for quick profile switching (⌘1 through ⌘9) plus a Profiles menu in the app.
• Added profile-aware widget and App Shortcuts support so actions can run with a selected profile.
The developer, Cleanbit, MB, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- Cleanbit, MB
- Size
- 5 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later. - Apple Vision
Requires visionOS 26.0 or later.
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Cleanbit, MB. 2026