# Countdown · Days Until & Timer vs Causal Loop Diagram

The clearest difference is update cadence: Countdown · Days Until & Timer at every 4 days against Causal Loop Diagram's every 3 weeks. Causal Loop Diagram's advantage is iOS requirement (16.0 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Countdown · Days Until & Timer ships an update every 4 days, Causal Loop Diagram every 3 weeks. The most recent releases landed on September 27, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Countdown · Days Until & Timer | Causal Loop Diagram |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Size | 6 MB | 4 MB |
| Requires iOS | 18.6 | **16.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Euler Alvarenga](https://appshunter.io/developer/1861523246) | [seiji honda](https://appshunter.io/developer/1896430544) |

## What reviewers say

### Countdown · Days Until & Timer

[App page](https://appshunter.io/ios/app/countdown-days-until-and-timer/id6756578719)

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

**In-app purchases:** none


### Causal Loop Diagram

[App page](https://appshunter.io/ios/app/causal-loop-diagram/id6769942289)

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

**In-app purchases:** none


## Frequently asked questions

### Is Countdown · Days Until & Timer free?

Countdown · Days Until & Timer is free to download, with no in-app purchases.

### Is Causal Loop Diagram free?

Causal Loop Diagram is free to download, with no in-app purchases.

### Do Countdown · Days Until & Timer or Causal Loop Diagram have ads?

Neither Countdown · Days Until & Timer nor Causal Loop Diagram shows ads.

### Which is updated more often, Countdown · Days Until & Timer or Causal Loop Diagram?

Countdown · Days Until & Timer ships an update every 4 days, and Causal Loop Diagram every 3 weeks. Most recently, Countdown · Days Until & Timer was updated on September 27, 2026 and Causal Loop Diagram on September 23, 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.*