# Build brief — a focused alternative to Dashlane

> **Verdict:** Partly, if you narrow it · **Buildability:** 63/100 · **Category:** Security
> **Source:** https://www.canitbevibecoded.com/dashlane
> Independent editorial assessment from Can It Be Vibe Coded? Not affiliated with, endorsed by, or derived from Dashlane. Verify current pricing and capabilities before acting.

## Context

**Dashlane** — Password manager with autofill, passkeys, sharing, and security alerts. It currently costs $4.99/mo.

A simple vault is buildable, but matching Dashlane's extension/mobile autofill, passkey support, breach monitoring, sharing, and trust posture is not a casual clone.

This brief describes a focused, single-operator replacement for the part of Dashlane that is genuinely reproducible. It is deliberately narrower than the product it replaces, and it says so in writing. Build the useful core; do not pretend to have rebuilt the rest.

## What you are building

Build or adopt an encrypted vault, generate passwords, and sync encrypted data across devices.

- Prototype the workflow, but rely on audited libraries and established security tools.
- A responsive interface with real empty, loading, success, and error states.

## Requirements

### Functional

- Encrypted storage.
- Browser extension.
- Mobile autofill support.
- Secure backup.
- Optional breach data source.

### Non-functional

- Accessibility: semantic markup, labelled controls, visible focus, and reduced-motion support.
- Security: server-side secrets, validated input, and no credentials in the client bundle.
- Reliability: retries with backoff on external calls, and a clear failure state when a provider is down.
- Portability: the operator can export their data and leave without losing it.

## Implementation brief

Build me a personal password vault to replace Dashlane. Requirements:

- A Node CLI: `vault add <name>`, `vault get <name>`, `vault list`, `vault gen`.
  `get` copies the secret to the clipboard with clipboardy and clears it after
  20 seconds.
- The vault is one encrypted file at ~/.vault/store.age, encrypted with age
  (shell out to the age binary), key derived from a master passphrase prompted
  at runtime and never written to disk.
- Each entry: name, username, password, URL, notes, updated timestamp. JSON
  inside the encrypted file, decrypted only in memory.
- `vault gen` produces a 24-char random password via crypto.randomBytes, plus a
  4-word diceware option for passphrases.
- `vault backup` writes a datestamped encrypted copy to ~/.vault/backups/ so I
  can sync it with any file-sync tool I already trust.
- Fully local: no accounts, no telemetry, zero network calls.
- Out of scope: browser-extension autofill, passkeys, breach alerts, sharing.
  Do not invent any crypto, use age exactly as shipped.
- README: state plainly that KeePassXC or Bitwarden is the sane choice for most
  people, and that a forgotten master passphrase means the vault is gone.

## Delivery standard

- Inspect the repository first, then write a short implementation plan before writing code.
- Deliver the smallest complete end-to-end workflow first; every primary control must work against persisted data.
- Use real validation and storage; never substitute fake dashboards, decorative controls, hard-coded success states, or mock integrations.
- Include responsive layouts plus genuine empty, loading, success, validation, and failure states.
- Keep secrets server-side in environment variables, provide .env.example, and never commit credentials or user data.
- Add structured logs around every external call and return actionable errors without leaking sensitive details.
- Write unit tests for the core logic and one automated test of the main user journey.
- Finish with a README covering setup, architecture, data location, backups, tests, deployment, and known limitations.

## Acceptance criteria

- [ ] A clean install starts the app using only the README and .env.example.
- [ ] The primary journey works from first visit through saved result, reload, edit, export, and deletion where applicable.
- [ ] Invalid input, missing configuration, provider failure, and an empty database each have a usable state.
- [ ] The interface works at 390px and 1440px, is keyboard navigable, and shows visible focus on every control.
- [ ] Tests, type checking, linting, and a production build all pass with no ignored failures.
- [ ] No part of the interface implies a live integration, security guarantee, or scale capability that was not actually built and verified.

## Non-goals

Do not build these, and do not claim to have replaced them:

- Autofill polish.
- Passkeys.
- Security alerts.
- Account recovery.
- Trust, audits, and counterparties matter more than feature parity.
- The last 20 percent is sync, migration fidelity, speed, and edge cases.

## What you still own after launch

- Run migrations, backups, restores, and dependency updates.
- Test the critical journey after every model, API, or hosting change.
- Monitor failures and fix the edge cases a first prompt will miss.

## Risk

**High consequence.** Use this as a prototype or personal aid. Keep a qualified human and an established provider in the loop for consequential decisions.

Editorial confidence in this assessment: medium. No independent one-shot implementation is linked yet.

## Prior art

Working open-source software you can read, fork, or borrow from before starting:

- [KeePassXC](https://github.com/KeePassXreboot/keepassxc) — Open-source local password manager prior art; not a Dashlane clone but covers the core vau

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