# Upstream_UPB vs Cardinal Study

The clearest difference is update cadence: Upstream_UPB at fortnightly against Cardinal Study's every 3 months. Upstream_UPB also leads on iOS requirement (12.0 vs 15.5). 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.

Upstream_UPB ships an update fortnightly, Cardinal Study every 3 months. The most recent releases landed on October 8, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Upstream_UPB | Cardinal Study |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 months |
| Size | 89 MB | 72 MB |
| Requires iOS | **12.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [ERT, INC](https://appshunter.io/developer/1160214546) | [Hello Thread](https://appshunter.io/developer/996237890) |

## What reviewers say

### Upstream_UPB

[App page](https://appshunter.io/ios/app/upstream-upb-cp-06/id6743447036)

**Features:** macOS Compatibility

**In-app purchases:** none


### Cardinal Study

[App page](https://appshunter.io/ios/app/cardinal-study/id6764213269)

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

**In-app purchases:** none


## Frequently asked questions

### Is Upstream_UPB free?

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

### Is Cardinal Study free?

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

### Do Upstream_UPB or Cardinal Study have ads?

Neither Upstream_UPB nor Cardinal Study shows ads.

### Which is updated more often, Upstream_UPB or Cardinal Study?

Upstream_UPB ships an update fortnightly, and Cardinal Study every 3 months. Most recently, Upstream_UPB was updated on October 8, 2026 and Cardinal Study on October 7, 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.*