# Cephalo vs BDA Peng

The clearest difference is in-app purchases: BDA Peng at none against Cephalo's 2. Cephalo's advantage is update cadence (every 2 weeks vs every 5 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Cephalo sells 2 in-app purchases, starting at $2.99 per month. BDA Peng asks for nothing beyond the download.

Cephalo ships an update every 2 weeks, BDA Peng every 5 months. The most recent releases landed on September 29, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Cephalo | BDA Peng |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 5 months |
| Size | 13 MB | 27 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 12+ | 17+ |
| Developer | [Iterica B.V.](https://appshunter.io/developer/1832191465) | [The British Dietetic Association](https://appshunter.io/developer/916548291) |

## What reviewers say

### Cephalo

[App page](https://appshunter.io/ios/app/cephalo-headache-diary/id6749801188)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cephalo Plus Monthly | $2.99 | per month |
| Cephalo Plus Yearly | $24.99 | per year |


### BDA Peng

[App page](https://appshunter.io/ios/app/bda-peng/id6749851220)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Cephalo free?

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

### Is BDA Peng free?

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

### Do Cephalo or BDA Peng have ads?

Neither Cephalo nor BDA Peng shows ads.

### Which is updated more often, Cephalo or BDA Peng?

Cephalo ships an update every 2 weeks, and BDA Peng every 5 months. Most recently, Cephalo was updated on September 29, 2026 and BDA Peng on October 10, 2026.

---

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