# OCA vs CalPains

The clearest difference is in-app purchases: OCA at none against CalPains's 4. OCA also leads on iOS requirement (15.1 vs 26.0). CalPains's advantage is device support. On price and update cadence there is nothing between them.

Both are free to download. CalPains sells 4 in-app purchases, starting at $5.99 per month. OCA asks for nothing beyond the download.

OCA ships an update every 3 weeks, CalPains monthly. The most recent releases landed on October 10, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | OCA | CalPains |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/calpains/id6755204620/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Size | 42 MB | 36 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | — | **iPhone, iPad** |
| Age rating | 12+ | 4+ |
| Developer | [COMBALBERT LAURENT](https://appshunter.io/developer/569446537) | [Adrien GAILLET](https://appshunter.io/developer/1213460842) |

## What reviewers say

### OCA

[App page](https://appshunter.io/ios/app/oca-observer-comprendre-agir/id6483933544)

**In-app purchases:** none


### CalPains

[App page](https://appshunter.io/ios/app/calpains/id6755204620)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Essentials monthly | $5.99 | per month |
| Team monthly | $14.99 | per month |
| Essentials yearly | $59.99 | per year |
| Team yearly | $149.99 | per year |


## Frequently asked questions

### Is OCA free?

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

### Is CalPains free?

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

### Which is updated more often, OCA or CalPains?

OCA ships an update every 3 weeks, and CalPains monthly. Most recently, OCA was updated on October 10, 2026 and CalPains on October 23, 2026.

---

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