# Best Phone Security vs Cepstrum

The clearest difference is ads: Cepstrum at none against Best Phone Security's shown. Cepstrum also leads on update cadence (every 2 days vs every 3 months). Best Phone Security's advantage is iOS requirement (15.0 vs 18.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Best Phone Security sells 1 one-off in-app purchase and Cepstrum sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Best Phone Security ships an update every 3 months, Cepstrum every 2 days. The most recent releases landed on October 26, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Best Phone Security | Cepstrum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (3K ratings)](https://appshunter.io/ios/app/best-phone-security/id415230664/reviews)** | — |
| Number of ratings | **3K** | — |
| Positive reviews | 68.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 59 MB | 9 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RV AppStudios LLC](https://appshunter.io/developer/340181308) | [Tongkun Lan](https://appshunter.io/developer/1870124868) |

## What reviewers say

### Best Phone Security

[App page](https://appshunter.io/ios/app/best-phone-security/id415230664)

This app triggers an alarm when your device is touched or moved, deterring unauthorized access. It offers a PIN code for unlocking and a security alarm to notify you of any tampering. Ideal for protecting your device in public or from prying eyes.

**Highlights:** PIN code unlock, Security alarm notification, Motion-triggered alarm, Deterrent against unauthorized access

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock New Features | $4.99 | one-time |

**What reviewers like**

- 🚀 Effective security
- 🔒 Alerts user when phone is touched
- 👍 Easy to use
- 🔒 Helps catch intruders

**What reviewers complain about**

- 🐛 Alarm can be easily deactivated
- 🐛 Doesn't work when phone is locked
- 🐛 Inconsistent performance
- 🔋 Drains battery

**Reported bugs**

- Alarm doesn't always trigger
- Doesn't work as expected when phone is locked
- Crashes frequently

**Requested features**

- Take photo of intruder
- Send alert notifications
- Louder alarm
- Ability to lock app with passcode


### Cepstrum

[App page](https://appshunter.io/ios/app/cepstrum/id6799487881)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cepstrum | $4.99 | one-time |


## Frequently asked questions

### Is Best Phone Security free?

Best Phone Security is free to download, with in-app purchases available.

### Is Cepstrum free?

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

### Do Best Phone Security or Cepstrum have ads?

Best Phone Security shows ads; Cepstrum does not.

### Which is updated more often, Best Phone Security or Cepstrum?

Best Phone Security ships an update every 3 months, and Cepstrum every 2 days. Most recently, Best Phone Security was updated on October 26, 2026 and Cepstrum on October 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.*