# EMS.Inventory vs PSSI

The clearest difference is update cadence: PSSI at every 2 days against EMS.Inventory's monthly. EMS.Inventory's advantage is iOS requirement (15.6 vs 17.0). 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.

EMS.Inventory ships an update monthly, PSSI every 2 days. The most recent releases landed on October 8, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | EMS.Inventory | PSSI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/emsinventory/id945959775/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | Free | — |
| Size | 8 MB | 135 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [SFS Chemical Safety Inc.](https://appshunter.io/developer/521270523) | [Evan Richardson](https://appshunter.io/developer/1727360047) |

## What reviewers say

### EMS.Inventory

[App page](https://appshunter.io/ios/app/emsinventory/id945959775)

This application helps manage chemical inventory from purchase to disposal. It streamlines tracking, purchasing, distribution, sharing, and disposal processes when used with its web counterpart.

**Highlights:** Chemical inventory tracking, Purchase management, Distribution tracking, Disposal management, Integration with web application, Simplified chemical data management

**Features:** Vision Pro support

**In-app purchases:** none


### PSSI

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

**In-app purchases:** none


## Frequently asked questions

### Is EMS.Inventory free?

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

### Is PSSI free?

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

### Do EMS.Inventory or PSSI have ads?

Neither EMS.Inventory nor PSSI shows ads.

### Which is updated more often, EMS.Inventory or PSSI?

EMS.Inventory ships an update monthly, and PSSI every 2 days. Most recently, EMS.Inventory was updated on October 8, 2026 and PSSI on September 25, 2026.

---

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