# Decision IO vs Causal Loop Diagram

The clearest difference is in-app purchases: Causal Loop Diagram at none against Decision IO's 2. Decision IO's advantage is iOS requirement (14.0.0 vs 16.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Decision IO sells 2 in-app purchases, starting at $7.99 per month. Causal Loop Diagram asks for nothing beyond the download.

Decision IO ships an update monthly, Causal Loop Diagram every 3 weeks. The most recent releases landed on September 9, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Decision IO | Causal Loop Diagram |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Size | 48 MB | 4 MB |
| Requires iOS | **14.0.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Altius Opes LLC](https://appshunter.io/developer/1792062188) | [seiji honda](https://appshunter.io/developer/1896430544) |

## What reviewers say

### Decision IO

[App page](https://appshunter.io/ios/app/decision-io/id6740878575)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Access - Monthly | $7.99 | per month |
| Pro Access - Yearly | $59.99 | per year |


### 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 Decision IO free?

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

### Is Causal Loop Diagram free?

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

### Do Decision IO or Causal Loop Diagram have ads?

Neither Decision IO nor Causal Loop Diagram shows ads.

### Which is updated more often, Decision IO or Causal Loop Diagram?

Decision IO ships an update monthly, and Causal Loop Diagram every 3 weeks. Most recently, Decision IO was updated on September 9, 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.*