Security and privacy decision
LastPass Premium
A capable developer or small team can build a trustworthy personal password manager replacement for LastPass Premium (client-side encryption, cloud sync, browser extension) within a multi-week effort; you’ll lose LastPass’s polished cross-platform integrations, enterprise features, dark-web monitoring, and brand-level trust.
Visit website↗Open-source builds that already do this
Every project below is open source and already does this job today. Fork one, self-host it, or take the parts you need — the build prompt further down assumes an empty file, and this is the shortcut past that. Licences differ; check the one on each card before you ship.
What a replacement has to do
- Store encrypted credentials client-side, sync encrypted vault to your cloud account, autofill credentials into sites via browser extension, generate new strong passwords
What it still won’t have
- Enterprise-grade admin console, SSO, and advanced team policies
- Extensive browser/OS integrations and polishing across many platforms
- Dark web monitoring and threat intelligence feeds
- Brand trust, large user base, and commercial SLAs/support
- Proprietary telemetry and long-term security hardening at scale
What remains hard
- Brand trust
Trusted by companies and individuals everywhere
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 7 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a minimal personal password manager using React for UI, a Chromium browser extension, Node.js + Express for a simple sync API, and PostgreSQL or DynamoDB for encrypted blob storage. Implement: (1) client-side vault encryption (Argon2 or PBKDF2 to derive a key from master password, then AES-GCM/ChaCha20-Poly1305 for entries), (2) user account registration and login that never sends plaintext vault or master key, (3) an API to store/retrieve an encrypted vault blob with versioning and conflict handling, (4) a browser extension to autofill and capture credentials and to trigger vault sync, and (5) a password generator and local search. Out of scope: enterprise admin console, dark-web monitoring, advanced MFA integrations, and passkey provisioning. Require error handling for sync conflicts, network failures, and corrupted blobs, plus unit tests for crypto routines and end-to-end tests for sync and autofill flows.
How we checked
How the score was reached
- Partly verdict base52
- An open-source build was found+5
- 5 cited sources+3
- 3/3 assessment runs agreed+4
- Evidence score64
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time — so the same evidence always produces the same number.
How scoring works →Cited sources · 5
Every page the run actually retrieved.
- official productLastPass homepage
- official pricingLastPass pricing
- official docsLastPass features
- open sourcepassbolt/passbolt_api
- open sourcebitwarden/android
Integrity checks
What held up, and what did not.
