# Formulation Compass vs PSSI

The clearest difference is ads: PSSI at none against Formulation Compass's shown. PSSI also leads on update cadence (every 2 days vs monthly). Formulation Compass's advantage is iOS requirement (11.0 vs 17.0). On price, 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.

Formulation Compass ships an update monthly, PSSI every 2 days. The most recent releases landed on October 20, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Formulation Compass | PSSI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 days** |
| Size | 33 MB | 135 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [The Dow Chemical Company](https://appshunter.io/developer/353404902) | [Evan Richardson](https://appshunter.io/developer/1727360047) |

## What reviewers say

### Formulation Compass

[App page](https://appshunter.io/ios/app/formulation-compass-agrochem/id1448997457)

**Features:** macOS Compatibility

**In-app purchases:** none


### PSSI

[App page](https://appshunter.io/ios/app/pssi/id6499057790)

**In-app purchases:** none


## Frequently asked questions

### Is Formulation Compass free?

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

### Is PSSI free?

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

### Do Formulation Compass or PSSI have ads?

Formulation Compass shows ads; PSSI does not.

### Which is updated more often, Formulation Compass or PSSI?

Formulation Compass ships an update monthly, and PSSI every 2 days. Most recently, Formulation Compass was updated on October 20, 2026 and PSSI on October 11, 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.*