# Ding Dong Doorbell vs Contraction Timer

The clearest difference is in-app purchases: Ding Dong Doorbell at none against Contraction Timer's 1. Ding Dong Doorbell also leads on iOS requirement (12.0 vs 17.0). Contraction Timer's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Contraction Timer sells 1 one-off in-app purchase. Ding Dong Doorbell asks for nothing beyond the download.

Ding Dong Doorbell ships an update every 2 months, Contraction Timer every 3 weeks. The most recent releases landed on October 6, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Ding Dong Doorbell | Contraction Timer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 50 MB | 3 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dirk Uys](https://appshunter.io/developer/1765190519) | [SALEH MUSTAFA](https://appshunter.io/developer/1875062603) |

## What reviewers say

### Ding Dong Doorbell

[App page](https://appshunter.io/ios/app/ding-dong-doorbell/id6670178558)

**Features:** macOS Compatibility

**In-app purchases:** none


### Contraction Timer

[App page](https://appshunter.io/ios/app/contraction-timer-wavely/id6759206862)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Wavely Premium | $2.99 | one-time |


## Frequently asked questions

### Is Ding Dong Doorbell free?

Ding Dong Doorbell is free to download, with no in-app purchases.

### Is Contraction Timer free?

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

### Do Ding Dong Doorbell or Contraction Timer have ads?

Neither Ding Dong Doorbell nor Contraction Timer shows ads.

### Which is updated more often, Ding Dong Doorbell or Contraction Timer?

Ding Dong Doorbell ships an update every 2 months, and Contraction Timer every 3 weeks. Most recently, Ding Dong Doorbell was updated on October 6, 2026 and Contraction Timer on September 27, 2026.

---

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