# BIG CALCULATOR. vs Calculator Lock

BIG CALCULATOR. and Calculator Lock both sit at 4.6 stars, but that hides the real split: 100% of BIG CALCULATOR.'s written reviews are positive against 75% of Calculator Lock's. BIG CALCULATOR. also leads on monetization model (ad-supported vs free with in-app purchases). Calculator Lock's advantage is ratings volume (6.6K vs 65) and iOS requirement (13.0 vs 15.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. BIG CALCULATOR. sells 1 in-app purchase, starting at $2.99 per year and Calculator Lock sells 7 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.6 for BIG CALCULATOR. against 4.6 for Calculator Lock. That said, the two scores are not equally well evidenced: Calculator Lock has 6.6K ratings behind it against 65, so its average is the more settled of the two. Written reviews are what separate them: 100% of BIG CALCULATOR.'s written reviews are positive against 75% of Calculator Lock's.

BIG CALCULATOR. ships an update every 3 weeks, Calculator Lock every 2 weeks. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | BIG CALCULATOR. | Calculator Lock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (65 ratings)](https://appshunter.io/ios/app/big-calculator/id1114392920/reviews) | **[4.6 (6.6K ratings)](https://appshunter.io/ios/app/calculator-lock-secure-vault/id6446200267/reviews)** |
| Number of ratings | 65 | **6.6K** |
| Positive reviews | **100.0% of reviews** | 74.8% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 13 MB | 80 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Adysseus](https://appshunter.io/developer/447444997) | [ZipoApps](https://appshunter.io/developer/1671444635) |

## What reviewers say

### BIG CALCULATOR.

[App page](https://appshunter.io/ios/app/big-calculator/id1114392920)

This utility app offers a straightforward and visually clear calculator experience, ideal for users of all ages. Its large numbers and dark interface enhance readability, while landscape mode support on iPhones and iPads provides added convenience.

**Highlights:** Large numbers for easy viewing, Simple and easy-to-see interface, Landscape mode support, Dark UI for eye comfort, Suitable for all ages

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Big Calculator Plus | $2.99 | per year |


### 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 BIG CALCULATOR. free?

BIG CALCULATOR. is free to download, with in-app purchases available.

### Is Calculator Lock free?

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

### Which has better reviews, BIG CALCULATOR. or Calculator Lock?

Calculator Lock is rated higher. BIG CALCULATOR. averages 4.6 out of 5 from 65 ratings, while Calculator Lock averages 4.6 from 6.6K ratings.

### Do BIG CALCULATOR. or Calculator Lock have ads?

Both BIG CALCULATOR. and Calculator Lock show ads.

### Which is updated more often, BIG CALCULATOR. or Calculator Lock?

BIG CALCULATOR. ships an update every 3 weeks, and Calculator Lock every 2 weeks. Most recently, BIG CALCULATOR. was updated on November 2, 2026 and Calculator Lock on November 3, 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.*