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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsMozilla Monitor is the closest free alternative to Have I Been Pwned (HIBP) for checking email addresses and receiving breach alerts. Firefox Password Manager and Bitwarden also offer free breach-related checks, but they work differently: Firefox checks logins saved in its browser, while Bitwarden provides a report inside an individual password vault. Mozilla and Bitwarden both say they use HIBP data, so their interfaces do not necessarily provide an independent second breach database.
Which free alternative fits what you want to check?
| Service | What it checks | How it works | Free status and data source |
|---|---|---|---|
| Mozilla Monitor | Email addresses you submit | Checks known breaches and can monitor verified addresses for new matches | Free tier; Mozilla says it uses HIBP data |
| Firefox Password Manager | Logins saved in Firefox | Compares known breach dates with when a password was saved; also checks reuse among saved credentials | Mozilla documents the feature as built into Firefox; checks happen locally |
| Bitwarden Data Breach report | Data associated with an individual vault, including the master password | Runs a report against known breaches | Free for all users; Bitwarden says it uses HIBP data |
| Have I Been Pwned | Email address entered for lookup | Direct lookup on HIBP | The reviewed homepage presents an email exposure check; current free limits and privacy implementation are not established here |
Mozilla Monitor: the closest email-based alternative
Mozilla Monitor is the most direct option if you want to enter an email address, check it against known breaches, and receive alerts about new matches. Mozilla says it partners with HIBP and uses its database. After you verify an address, Monitor can automatically watch for new breach matches and provide steps for addressing them. It cannot fix an exposed account for you.
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What is free—and why the address limit is unclear
Mozilla describes Monitor as free, but its official pages disagree about the number of email addresses included: a support article says up to 20, while the current “How it works” page says five. Neither page explains the discrepancy. Treat Monitor as having a free tier, but check the limit displayed in your account before relying on a particular number.
Privacy and coverage limits
Mozilla’s terms say Monitor is available worldwide in partnership with HIBP. They also warn that neither service guarantees complete or timely records of public breaches. A match can be useful evidence of exposure; a clean result is only an indication that the address was not found in the records checked.
#1 Best Overall
Firefox Password Manager: alerts for saved browser logins
Firefox’s breach feature is not a general-purpose email lookup. Mozilla says Firefox compares known website breach dates with the dates passwords were saved in the browser. It alerts you when a breach happened after a saved password date, and it checks whether saved credentials are reused.
Mozilla says these checks happen locally and that saved passwords or login information are not sent to Mozilla. Choose this option when the logins you want to watch are already saved in Firefox; it does not replace entering an email address into a breach lookup service.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Bitwarden: a free breach report inside an individual vault
Bitwarden’s Data Breach report checks for compromised data in known breaches and is free for all users. It is available for an individual vault and can be run on the master password when an account is created. Bitwarden says it sends the first five digits of the master-password hash for comparison and never exposes the master password itself.
Do not confuse this report with Bitwarden’s other vault-health reports. Bitwarden identifies reports for exposed passwords, reused passwords, weak passwords, unsecured websites, and inactive two-factor authentication as premium features.
Quick Recap
What a breach-check result can—and cannot—tell you
- A match means you should act. Follow the service’s guidance, change the affected password, and avoid reusing that password elsewhere.
- No match is not proof of safety. Mozilla’s terms say Mozilla Monitor and HIBP do not guarantee that records of public breaches are complete or timely. Read a negative result as “not found in the records checked,” not “never breached.”
- A different interface may not mean a separate database. Mozilla and Bitwarden both document use of HIBP data. Their checks can be convenient, but they do not necessarily provide an independent cross-check against a separate breach collection.
- Match the tool to the identifier. Use Monitor for submitted email addresses, Firefox for saved browser logins, and Bitwarden’s report for data associated with an individual vault.
How to choose
- You want an email lookup plus ongoing alerts: start with Mozilla Monitor, and verify its current free address limit in the account interface because Mozilla’s published pages conflict.
- You want alerts tied to passwords saved in Firefox: use Firefox’s built-in Password Manager checks, understanding that they are based on saved logins and known breach dates.
- You want a check within a password vault: use Bitwarden’s free individual-vault Data Breach report; its other listed vault-health reports are premium.
- You want a direct lookup: HIBP remains the baseline service. The available evidence here does not establish its current free limits or detailed privacy implementation.
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