# ICMS ST vs Alterdata e

The clearest difference is review sentiment: Alterdata e at 29% against ICMS ST's 0%. ICMS ST's advantage is iOS requirement (9.3 vs 15.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ICMS ST ships an update every 6 weeks, Alterdata e every 2 months. The most recent releases landed on September 17, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | ICMS ST | Alterdata e |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | **29.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 9 MB | 5 MB |
| Requires iOS | **9.3** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Econet Editora Empresarial](https://appshunter.io/developer/978051921) | [Alterdata Tecnologia em Informatica Ltda](https://appshunter.io/developer/1376581338) |

## What reviewers say

### ICMS ST

[App page](https://appshunter.io/ios/app/icms-st-econet/id998352544)

Access comprehensive ICMS and tax substitution information on your mobile device. Search for goods by NCM or description to view crucial tax data, including margins, rates, and protocols. Calculate tax substitution values and identify applicable tax benefits.

**Highlights:** ICMS and tax substitution information access, Search goods by NCM or description, View tax substitution data (margins, rates, protocols), Tax substitution calculation simulator, Identify applicable tax rates and benefits, FAQ on tax substitution

**Features:** macOS Compatibility

**In-app purchases:** none


### Alterdata e

[App page](https://appshunter.io/ios/app/alterdata-e-contador/id1411356193)

Access your documents and communicate directly with your accountant through a cloud-integrated solution. This app offers a simple interface for viewing documents, marking them as paid, and managing favorites, streamlining communication with your accounting firm.

**Highlights:** Cloud-integrated document access, Direct communication with accountant, View and manage documents, Mark documents as paid, Mark documents as favorites, Streamlined business processes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ICMS ST free?

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

### Is Alterdata e free?

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

### Do ICMS ST or Alterdata e have ads?

Neither ICMS ST nor Alterdata e shows ads.

### Which is updated more often, ICMS ST or Alterdata e?

ICMS ST ships an update every 6 weeks, and Alterdata e every 2 months. Most recently, ICMS ST was updated on September 17, 2026 and Alterdata e on October 8, 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.*