Comparison

addy.io extension vs Fastmask

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

addy.io extension

Features
Read full description

Open-source Anonymous Email Forwarding, create unlimited email aliases for free This extension makes it quick and easy to view, search, manage and create new aliases. Please Note: The free plan is currently limited to a total of 10 active shared domain aliases (e.g. *@anonaddy.me) and 10MB monthly bandwidth. You can still create unlimited standard aliases for free by giving out anything@username.anonaddy.com as your email address, the browser extension is not required to create these type of aliases. To use this extension you first need to register (https://app.addy.io/register) an account with addy.io (it's free), then you can generate an API key on the settings page. If you are self-hosting addy.io then make sure to click "change instance" and enter the location of your web app. Paste your API key in the extension to save it. Now you can simply open the extension and create a new alias for any site. Why should I use addy.io? There are a number of reasons you should consider using this service: - Protect your real email address from spam by simply deactivating/deleting aliases that receive unsolicited emails - Identify who has sold your data by using a different email address for every site - Protect your identity in the event of a data breach by making it difficult for hackers to cross-reference your accounts - Prevent inbox snooping by encrypting all inbound emails using GPG/OpenPGP encryption - Update where emails are forwarded without having to go through and change your email address for each site individually - Reply to forwarded emails anonymously without revealing your true email address This addon is open-source - https://github.com/anonaddy/browser-extension Bugs and Issues: Please report any issues at https://github.com/anonaddy/browser-extension/issues

About

Fastmask

Features
Read full description

Fastmask is the companion app for Fastmail users who rely on masked email aliases. Connect your Fastmail account using secure Fastmail login to instantly create, manage, and disable aliases - keeping your real address private, reducing spam, and staying in control of where your messages go. • Secure Fastmail login • Create aliases instantly, including custom email prefixes. • Set local expiration dates for aliases. • Enable or disable aliases anytime to stop unwanted mail. • Bulk actions: manage multiple aliases at once. • Edit existing alias descriptions. • View, search, and open target domains directly from the list. • Tap an alias to quickly copy it—fast and accessible. • Safari Web Extension: Create masked email aliases directly from Safari and send them to the app. • Create aliases via the Shortcuts app for automation and one-tap workflows. • Manage multiple Fastmail accounts in one place with a dedicated sidebar. • Optimized layout for both iPhone and iPad. • Privacy-first design: no trackers, no data sharing, no selling. Upgrade to unlock unlimited aliases, full multi-account support, and all advanced features—seamlessly integrated with Fastmail.

Screenshots

addy.io extension3 screens
Fastmask4 screens

Verdict

The call

The clearest difference is in-app purchases: addy.io extension at none against Fastmask's 3. addy.io extension also leads on device support (4 vs 2) and iOS requirement (15.0 vs 26.0). Fastmask's advantage is update cadence (every 6 days vs every 4 weeks). On price and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Fastmask sells 3 one-off in-app purchases. addy.io extension asks for nothing beyond the download.

UpkeepUpdate frequency

addy.io extension ships an update every 4 weeks, Fastmask every 6 days. Both last shipped on October 25, 2026.

Scorecard4 real differences · 2 level
addy.io extension versus Fastmask: the parameters behind the verdict, then further details
Parameteraddy.io extensionFastmask
PriceFreeFree
Update frequencyEvery 4 weeksEvery 6 days — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS15.0 — better26.0
Further details — not scored
Size7 MB7 MB
Age rating4+4+
Developeraddy.ioVitali Quiering

In-app purchases

None

addy.io extension

No in-app purchases

3 purchases

Fastmask

One-time3
  • Multi Account$2.99
  • Unlimited Aliases$3.99
  • Pro Bundle$6.99

Questions

Is addy.io extension free?
addy.io extension is free to download, with no in-app purchases.
Is Fastmask free?
Fastmask is free to download, with in-app purchases available.
Do addy.io extension or Fastmask have ads?
Neither addy.io extension nor Fastmask shows ads.
Which is updated more often, addy.io extension or Fastmask?
addy.io extension ships an update every 4 weeks, and Fastmask every 6 days. Most recently, addy.io extension was updated on October 25, 2026 and Fastmask on October 25, 2026.

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