# Notepad One vs Calculator Lock

The clearest difference is in-app purchases: Notepad One at none against Calculator Lock's 7. Calculator Lock's advantage is update cadence (every 2 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Notepad One ships an update every 3 months, Calculator Lock every 2 weeks. The most recent releases landed on September 30, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Notepad One | Calculator Lock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (6.1K ratings)](https://appshunter.io/ios/app/calculator-lock-secure-vault/id6446200267/reviews)** |
| Number of ratings | — | **6.1K** |
| Positive reviews | — | 74.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 30 MB | 80 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Mei Ee Lee](https://appshunter.io/developer/1469547874) | [ZipoApps](https://appshunter.io/developer/1671444635) |

## What reviewers say

### Notepad One

[App page](https://appshunter.io/ios/app/notepad-one/id1528872965)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Notepad One free?

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

### Is Calculator Lock free?

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

### Do Notepad One or Calculator Lock have ads?

Both Notepad One and Calculator Lock show ads.

### Which is updated more often, Notepad One or Calculator Lock?

Notepad One ships an update every 3 months, and Calculator Lock every 2 weeks. Most recently, Notepad One was updated on September 30, 2026 and Calculator Lock on October 15, 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.*