# Calculator Lock vs KVD

The clearest difference is review sentiment: Calculator Lock at 75% against KVD's 0%. Calculator Lock also leads on rating (4.6 vs 1.0) and ratings volume (6.6K vs 1). KVD's advantage is in-app purchases (none vs 7) and ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Calculator Lock sells 7 in-app purchases, starting at $1.99 per 7 days. KVD asks for nothing beyond the download.

Calculator Lock holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: Calculator Lock has 6.6K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 75% of Calculator Lock's written reviews are positive against 0% of KVD's.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on November 14, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Calculator Lock | KVD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (6.6K ratings)](https://appshunter.io/ios/app/calculator-lock-secure-vault/id6446200267/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/kvd/id6747338543/reviews) |
| Number of ratings | **6.6K** | 1 |
| Positive reviews | **74.8% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 80 MB | 7 MB |
| Requires iOS | **13.0** | 15 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [ZipoApps](https://appshunter.io/developer/1671444635) | [家庆 胡](https://appshunter.io/developer/1854983941) |

## What reviewers say

### Calculator Lock

[App page](https://appshunter.io/ios/app/calculator-lock-secure-vault/id6446200267)

Securely hide your private photos, videos, contacts, and passwords behind a disguised calculator interface. Protect your sensitive files with a secret vault and access them only through the app's unique interface. Features include intruder selfies and cloud backups.

**Highlights:** Photo hiding, Video hiding, Contact hiding, Password manager, Disguise mode, Intruder selfie, Cloud backup

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calculator Lock Pro Weekly | $1.99 | per 7 days |
| Hide Photos & Videos | $4.99 | per month |
| Calculator Lock Pro Yearly | $14.99 | per year |
| Remove Ads | $3.99 | one-time |
| Calculator Lock (Remove Ads) | $3.99 | one-time |
| Calculator Lock Pro (Discount) | $14.99 | one-time |
| Calculator Lock Pro (Lifetime) | $29.99 | one-time |

**What reviewers like**

- 🔒 Hidden app
- 👍 Good features
- 👍 Simple and easy to use
- 🔒 Secure vault for photos, videos, and passwords

**What reviewers complain about**

- 🐛 Buggy (doesn't save downloaded videos, can't paste in notes)
- 🔍 App name not very discreet
- 💸 Too much advertising

**Reported bugs**

- Doesn't save downloaded videos to gallery
- Can't paste information in notes
- Intruder selfie feature not working
- App icon change not working

**Requested features**

- Ability to change app name
- Sync between devices
- Ability to paste information in notes


### KVD

[App page](https://appshunter.io/ios/app/kvd/id6747338543)

Control the color temperature and brightness of lights via Bluetooth connection to your device. Adjust lighting settings to suit your preferences.

**Highlights:** Bluetooth light control, Adjust color temperature, Adjust brightness, Device connectivity

**Features:** macOS Compatibility, Vision Pro support, iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is Calculator Lock free?

Calculator Lock is free to download, with in-app purchases available.

### Is KVD free?

KVD is free to download, with no in-app purchases.

### Which has better reviews, Calculator Lock or KVD?

Calculator Lock is rated higher. Calculator Lock averages 4.6 out of 5 from 6.6K ratings, while KVD averages 1.0 from 1 ratings.

### Do Calculator Lock or KVD have ads?

Calculator Lock shows ads; KVD does not.

### Which is updated more often, Calculator Lock or KVD?

Calculator Lock ships an update every 2 weeks, and KVD every 2 weeks. Most recently, Calculator Lock was updated on November 14, 2026 and KVD on November 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*