Can AI build a password manager like 1Password?

Build a personal account inventory web app for my own use. It must never store passwords, passcodes, 2FA secrets, or recovery codes.

Tech rules:
- Plain HTML, CSS, and vanilla JavaScript in one file. No framework, build step, account, or server.
- Store all data in localStorage under one key, with a version number.
- Do not include any input field of type password. Do not include any field labeled password, PIN, secret, recovery code, or security answer.

Data model:
- Account: id, service, url, loginEmail, username, category (email | bank | shopping | social | work | subscription | other), twoFactor (none | sms | authenticator app | passkey | security key), recoveryMethod (text, for example "recovery email" or "codes printed in home safe"), inPasswordManager (yes | no), passwordStatus (strong | weak | reused | unknown), lastReviewed, notes.

Features:
- Add, edit, and delete accounts. Search by service or email.
- Dashboard: counts of accounts without 2FA, marked weak or reused, and not yet moved to my new password manager.
- Filter by category and by login email, so I see everything tied to one email address.
- "Migration mode": a checklist view for moving from 1Password to a new manager, one account at a time.
- "Review due" list: accounts not reviewed in 12 months.

Edge cases the build must handle correctly:
1. If I paste text that looks like a password or secret into notes (a string of 16+ characters with mixed letters, digits, and symbols and no spaces), warn me and offer to remove it before saving.
2. The same service with 2 different login emails is 2 separate accounts.
3. Deleting an account asks for confirmation.
4. URLs are stored as typed, and shown with the domain highlighted, so look-alike domains stand out.
5. Email-type accounts show how many other accounts use them for login and recovery, because losing that email puts those accounts at risk.

Backup:
- One-click "Export JSON" and "Export CSV". "Import JSON" restores after confirmation.
- "Import from password manager CSV": read only the service name, URL, and username or email columns. Discard every password, note, and OTP column before anything is stored, and say so on screen.

Layout:
- Mobile-first, readable at 375px wide.

Exclusions:
- No password storage, autofill, browser extension, encryption vault, sync, publishing, App Store submission, accounts, payments, or social features.

Write a short README explaining where the data is stored, how to export and restore it, and that this app is not a password manager and must never hold secrets.

Keep it under 600 lines. This is a personal tool, not a product.

What is the short answer?

Technically yes, but don’t build it. AI can generate a password vault that encrypts, decrypts, and looks finished, and that’s the problem. 1Password Individual costs $3.99 per month billed annually, and a mistake in a home-made vault costs every account you own.

The better way to stop paying is to switch, not build. Free password managers maintained by security teams exist. Move your vault to one, and use AI for the safe side job: an inventory of your accounts that never stores a password.

Option	Best for	Upfront cost	Ongoing cost	Main limitation
Build a rough prototype	Only developers learning encryption with fake test data, never real passwords	$0 and 4–6 hours	$0	Unaudited encryption and no safe autofill
Build a daily-use personal version	Nobody. Build the password-free account inventory in the starter prompt instead	$0 and 1–2 hours for the inventory	$0	The inventory doesn’t store or fill passwords
Keep paying for 1Password	People who want family sharing, Travel Mode, and polished apps on every platform	$0	$3.99/mo billed annually ($47.88/yr)	Price rose for renewals from March 27, 2026

The ready-to-paste starter prompt at the end of this page builds the account inventory, not a vault.

What should the first version include?

The first version of the safe alternative is a list of your accounts with no secrets in it. It answers questions like “which accounts use my old university email?” and “which ones still lack 2FA?”

• Account list with login email and service URL
• 2FA method and where the recovery method lives
• Migration status for moving from 1Password
• Weak or reused password flags as yes/no only
• JSON and CSV export
• Deliberate exclusion: no password fields anywhere. The inventory is useless to an attacker by design.

What can AI build reliably?

AI builds the inventory reliably. It’s a form, a list, and a few filters, like the other personal apps on this site.

AI can also write a working vault, using the browser’s built-in encryption. That’s what makes this dangerous. The code runs, your passwords come back when you type the master password, and nothing tells you whether the key derivation is too weak, an IV repeats, or a decrypted password lingers somewhere readable. Those bugs are invisible to a non-expert and obvious to an attacker.

Where will AI need human help?

For a vault, AI needs a security expert, not you. The parts that matter most are the parts you can’t test by clicking around:

• Encryption correctness. Working decryption says nothing about strength.
• Autofill. 1Password refuses to fill a password on a look-alike domain. A web page can’t autofill into other sites at all without a browser extension, and a copy-paste workflow removes that phishing protection.
• Storage. Anything in browser storage is readable by any script that runs on the same page. One unsafe library or injected script and the vault is exposed.
• Recovery. Forget the master password of a self-built vault and everything is gone. No support team can help.

A journal or period tracker in browser storage is a reasonable privacy trade-off. A password vault is the key to all of those, and to your email and bank.

For the inventory, test one thing: paste a random password into the notes field and confirm the app warns you.

Can I get my data out of 1Password?

Yes. The 1Password desktop app exports your vault, including a CSV format that other password managers import [VERIFY current formats and steps in 1Password’s support docs]. Export from the desktop app, not the phone app.

The trap: the export file is unencrypted. Every password sits in plain text in your Downloads folder. Import it into your new manager immediately, confirm a handful of logins work, then delete the file and empty the trash. Don’t email it, sync it to cloud storage, or paste it into an AI chat.

Some items move imperfectly between managers: passkeys, file attachments, and custom fields often need manual handling [VERIFY for your target manager]. Keep 1Password active until you’ve checked your 10 most important accounts in the new one.

The starter prompt’s inventory can import the same CSV, but it reads only service names, URLs, and usernames, and discards password columns before saving anything.

How long will it take and what will it cost?

Switching to a free password manager: 1–2 hours, including export, import, spot checks, and deleting the export file. $0.

The account inventory: 1–2 hours to build on a free AI plan. $0.

A self-built vault: not recommended at any budget.

1Password Individual costs $47.88 per year at renewal. Switching to a free manager saves that from the first renewal, with no build time at all.

These are estimates from reviewing the task, not measurements from a completed build.

Which AI tool or approach should I use?

Use ChatGPT or Claude for the inventory and to walk you through the migration steps for your chosen manager. Either works on a free plan.

Don’t paste real passwords, vault exports, or recovery codes into any AI tool, including Cursor or Lovable. Give examples with fake data if you need help with a CSV format.

What will I need to maintain?

For the free password manager: its own updates, which the provider handles.

For the inventory:

• Add new accounts when you sign up for something
• Review the “no 2FA” list every 6 months
• Export a JSON backup occasionally; it contains no secrets, but it does list your accounts, so store it privately

Should I build it, buy it, or reduce scope?

Build it: never, for real passwords. Build the account inventory instead if you want a tool of your own.

Buy it if you share passwords with family, travel with sensitive vaults, or want one manager across Windows, Android, and Apple devices. At $47.88 per year, 1Password is fair value for those features.

Reduce scope to a free manager if you only need passwords synced across your own devices. TidBITS’ coverage of the 1Password price increase weighs Apple’s free Passwords app as the obvious alternative for Apple users. Bitwarden’s free plan covers mixed devices [VERIFY current free plan limits].

Recommendation: don’t build it. If $47.88 per year bothers you, switch to a free password manager this week. Keep 1Password if you use family sharing. This is the one subscription on this site where building your own is the wrong answer.

What if I wanted to ship this to other people?

Shipping a password manager means independent security audits, bug bounties, encrypted sync infrastructure, browser extensions, and liability for other people’s accounts. Don’t. It’s among the highest-stakes software a person can release.

Starter build specification

• User: You, for your own use.
• Problem: Paying $47.88 per year for 1Password, and not knowing which accounts depend on which email or lack 2FA.
• Core workflow: Move passwords to a free password manager. Use the inventory to track each account’s login email, 2FA, and migration status.
• Required features: Account list, 2FA and recovery fields, migration checklist, email dependency counts, secret-detection warning in notes.
• Deliberate exclusions: No passwords, no secrets, no autofill, no sync, no accounts, no store submission.
• Data ownership: Stored in localStorage. Exported as JSON and CSV. Imported from a password manager CSV with password columns discarded.
• Definition of done: You import a 1Password CSV and the inventory lists your accounts with zero password values stored, confirmed by searching the JSON export for one known password and finding nothing.

For the principles behind which apps are safe to build yourself, read can AI build an app for me.

Sources and verification

• 1Password pricing and plans (1Password): Individual at $3.99 per month paid annually, with a $2.99 first-year promotion for new customers.
• Should 1Password’s price hike push you to Apple’s Passwords? (TidBITS): Individual rising from $35.88 to $47.88 per year for renewals on or after March 27, 2026.
• 1Password pricing breakdown (Carly): no free plan, 14-day trial.

This app was not built and tested for this page. The verdict is based on 1Password’s pricing, published coverage, and a security review of what a personal vault would require. 1Password’s price was checked on September 24, 2026.

Reviewed on September 24, 2026.