# Callme Timer vs Knock Knock

The clearest difference is in-app purchases: Knock Knock at none against Callme Timer's 1. Knock Knock also leads on update cadence (daily vs monthly). Callme Timer's advantage is device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Callme Timer sells 1 one-off in-app purchase. Knock Knock asks for nothing beyond the download.

Callme Timer ships an update monthly, Knock Knock daily. The most recent releases landed on November 9, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Callme Timer | Knock Knock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Daily** |
| Size | 4 MB | 22 MB |
| Requires iOS | **16** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [胜荇 杨](https://appshunter.io/developer/1868445802) | [Viraat Das](https://appshunter.io/developer/1239103283) |

## What reviewers say

### Callme Timer

[App page](https://appshunter.io/ios/app/callme-timer/id6758228672)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro lifetime | $0.99 | one-time |


### Knock Knock

[App page](https://appshunter.io/ios/app/knock-knock-5-minute-dates/id6774902208)

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

**In-app purchases:** none


## Frequently asked questions

### Is Callme Timer free?

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

### Is Knock Knock free?

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

### Do Callme Timer or Knock Knock have ads?

Neither Callme Timer nor Knock Knock shows ads.

### Which is updated more often, Callme Timer or Knock Knock?

Callme Timer ships an update monthly, and Knock Knock daily. Most recently, Callme Timer was updated on November 9, 2026 and Knock Knock on November 10, 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.*