Cycling through all six. Tap any point to stop.

Measured on six things

A working calculator that opens a private vault. Keep photos, notes, passwords and 2FA codes sealed, and message or call only the people you invite.

Security

HTTPS enforced, HSTS present, some headers set. Missing CSP, frame protection, SPF, DMARC. Claims AES-256 on-device encryption but no published audits or bug bounty. 6/12 checklist points.

Screenshots

1 / 4

Lock It: Calculator Vault

About this app

Lock It: Calculator Vault is a calculator that does real math. Type your own secret equation and press =, and it opens a private vault instead. Inside, you can keep photos and videos, notes, passwords and 2FA codes, encrypted with AES-256 on your phone. You can chat and make live video or voice calls with people you invite by key or QR code. Free with ads. Premium Pro is $4.99 a month, and Offline Vault is a $9.99 one-time purchase. Search "Lock It: Calculator Vault" on Google Play https://play.google.com/store/apps/details?id=com.appfactory.calculator&referrer=utm_source%3Dscoutforge%26utm_medium%3Dlisting%26utm_campaign%3Dfree_ads

Key features

1Calculator disguise: type a secret equation and press equals to open a private vault.
2Encrypted storage for photos, videos, notes, passwords, and 2FA codes using AES-256 on-device.
3Private messaging and live video/voice calls with invited contacts via key or QR code.

Target customer profile

Drawn from the product itself, not from a survey.

Demographic

Privacy-conscious Android users

Pain points

Worried about others accessing private photos, notes, or passwords on their phone.

Primary needs

A discreet, password-protected vault that doesn't look like a vault.

Demographic

Professionals handling sensitive data

Pain points

Need to store work-related credentials and 2FA tokens securely on a personal device.

Primary needs

Encrypted storage for multiple types of data, with easy access via a calculator disguise.

Demographic

Individuals in shared living situations

Pain points

Family members or roommates might borrow their phone and stumble upon private content.

Primary needs

A hidden app that looks innocuous, plus private messaging for confidential chats.

Scout Review

Written by AI from measured evidence, scored out of 100.

Lock It: Calculator Vault is a clever Android app that disguises a private vault behind a working calculator. Type your secret equation, press equals, and you're in. Inside: photos, notes, passwords, 2FA codes, encrypted chat, and live calls. The app UI looks polished and consistent. The website is less impressive — cramped text, undersized CTA, and missing security headers. Speed is excellent (Lighthouse 90/100 mobile). Security is a mixed bag: AES-256 on-device is good, but no third-party audits and incomplete HTTP headers. Accessibility is strong (96/100) with one minor fix needed. Growth is a real question — the disguise is clever, but Calculator Vault and Keepsafe already own this space. At $4.99/month or $9.99 one-time, pricing is fair. For privacy-conscious Android users who want a discreet vault, it's worth a look — just don't expect enterprise-grade compliance.

Measure by measure

Usability

Value prop is clear in hero, but unlock mechanism requires reading dense text. Single Play CTA with no secondary path. Free tier with ads, $4.99/mo Pro, $9.99 one-time offline — pricing is straightforward.

Design

Judged on the app's own UI via store screenshots and homepage mockups: consistent dark theme with orange accents, clear calculator/vault duality. Landing page has cramped text block and undersized Play CTA.

Speed

Lighthouse mobile 90/100, desktop 95/100. LCP 2.4s, TBT 0ms, FCP 873ms. CLS 0.172 is the weak spot — layout shifts on load. No user complaints about lag found.

Security

HTTPS enforced, HSTS present, some headers set. Missing CSP, frame protection, SPF, DMARC. Claims AES-256 on-device encryption but no published audits or bug bounty. 6/12 checklist points.

Accessibility

Lighthouse accessibility 96/100. Failing audit: missing main landmark. No a11y statement or multi-language support found. Automated checks only cover part of WCAG.

Growth

Real problem (phone privacy in shared spaces) with a specific wedge: calculator disguise plus encrypted chat. But alternatives like Calculator Vault and Keepsafe already own this niche. Domain is brand new.

Improvement areas

Website security headers: add CSP, frame protection, Permissions-Policy, SPF, and DMARC.
Publish third-party security audits or a bug bounty program to validate AES-256 claims.
Improve landing page design: fix CLS, resize Play CTA, add demo video, and clean up screenshot grid.

Design & Usability

Lock It's design is judged on the app itself, not just the landing page. The store screenshots show a clean, consistent dark UI with orange accents — calculator keypad, vault grid, security settings, and chat all look cohesive. The homepage, however, is a mixed bag: the hero card floats in excessive black space, the screenshot grid has mismatched bezels, and the Google Play button is undersized. Usability-wise, the value proposition is immediately clear, but the unlock mechanism requires reading a dense paragraph. There's no demo video or secondary CTA for curious users. Pricing is straightforward: free with ads, $4.99/month Pro, $9.99 one-time offline. The core interaction — type equation, press equals, vault opens — is genuinely clever and well-executed in the screenshots. But the onboarding path on the website feels like an afterthought.

Speed & Security

Speed is a strength: Lighthouse mobile 90/100, desktop 95/100, with LCP 2.4s and TBT 0ms. The only blemish is a CLS of 0.172, meaning the page shifts slightly on load. No user complaints about lag were found. Security is more complicated. The app claims AES-256 on-device encryption, which is solid for a consumer vault. But the website's HTTP headers are incomplete: no CSP, no frame protection, no SPF or DMARC. The checklist scores 6/12. There's no published SOC 2, ISO certification, or bug bounty program. For a privacy-focused product, that's a gap — users are asked to trust the encryption without third-party verification. The HTTPS and HSTS are in place, which is table stakes, but the missing email authentication records are a real oversight.

Accessibility & Growth

Accessibility scores 96/100 on Lighthouse, with one failing audit: missing main landmark. That's a minor fix. There's no accessibility statement or multi-language support mentioned, which limits reach. Automated checks only cover part of WCAG, so manual testing would be needed for a full picture. Growth potential is moderate. The problem — hiding private content on a shared phone — is real and the calculator disguise is a specific, demonstrable differentiator. But the category already has established players: Calculator Vault (photo/video focus) and Keepsafe (dedicated photo vault). Lock It adds encrypted chat and 2FA storage, which broadens the use case. The domain is brand new (registered 2026-09-29), and there's no traction data yet. The idea has room, but it needs to prove why users should switch from the incumbents.

Conclusion

Lock It nails the core idea: a calculator that hides a vault is genuinely useful for anyone in a shared living situation or handling sensitive data on a personal phone. The app's UI is clean, the encryption claim is solid, and the speed is impressive. But the website undersells it, and the security story lacks third-party validation. If you're comfortable trusting on-device AES-256 without an audit, the free tier is a low-risk way to try it. The $9.99 one-time Offline Vault is the best value if you don't need chat. Just know that the calculator disguise only works if nobody watches you type the equation.

Suggestions for improvement

Add a short demo video or animated GIF showing the equation-unlock flow — it's the killer feature and deserves more than a paragraph.
Publish a security page with details on AES-256 implementation, key management, and any third-party audits or bug bounty programs.
Fix the CLS (0.172) by reserving space for images and fonts to eliminate layout shift on load.
Add a main landmark to the homepage and consider an accessibility statement to reach WCAG compliance.

How we score

Alternatives comparison

Named competitors, point by point. Nobody paid to appear here or to be left out.

	Lock It: Calculator Vault	Calculator Vault	Keepsafe
Disguise mechanism	Calculator with secret equation unlock	Calculator disguise for photo/video hiding	No disguise; dedicated photo vault app
Encryption	AES-256 on-device	Not specified	Military-grade encryption
Supported content types	Photos, videos, notes, passwords, 2FA, chat	Photos and videos	Photos and videos
Pricing	Free with ads; $4.99/mo Pro; $9.99 one-time offline	Free with ads; in-app purchases	Free with ads; premium subscription
Private messaging/calls	Yes, with invited contacts	No	No