# EDTNA/ERCA vs S.Tool

EDTNA/ERCA and S.Tool are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on October 7, 2026.

## The numbers

| Metric | EDTNA/ERCA | S.Tool |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 21 MB | 66 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 12+ |
| Developer | [Trilobite Technologies, s.r.o.](https://appshunter.io/developer/1106306899) | [Katholieke Universiteit te Leuven](https://appshunter.io/developer/925286039) |

## What reviewers say

### EDTNA/ERCA

[App page](https://appshunter.io/ios/app/edtnaerca/id1531289859)

**Features:** macOS Compatibility

**In-app purchases:** none


### S.Tool

[App page](https://appshunter.io/ios/app/stool/id6739492755)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is EDTNA/ERCA free?

EDTNA/ERCA is free to download, with no in-app purchases.

### Is S.Tool free?

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

### Do EDTNA/ERCA or S.Tool have ads?

Neither EDTNA/ERCA nor S.Tool shows ads.

### Which is updated more often, EDTNA/ERCA or S.Tool?

EDTNA/ERCA ships an update every 2 months, and S.Tool every 2 months. Most recently, EDTNA/ERCA was updated on October 7, 2026 and S.Tool 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.*