# FED vs IngSoft InterWatt (eIAM)

The clearest difference is update cadence: IngSoft InterWatt (eIAM) at fortnightly against FED's every 4 months. 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.

FED ships an update every 4 months, IngSoft InterWatt (eIAM) fortnightly. The most recent releases landed on September 20, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | FED | IngSoft InterWatt (eIAM) |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Size | 129 MB | 51 MB |
| Requires iOS | **14.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Schweizerische Bundeskanzlei](https://appshunter.io/developer/1110875106) | [IngSoft GmbH](https://appshunter.io/developer/945284664) |

## What reviewers say

### FED

[App page](https://appshunter.io/ios/app/fed-login-access/id6467620427)

**In-app purchases:** none


### IngSoft InterWatt (eIAM)

[App page](https://appshunter.io/ios/app/ingsoft-interwatt-eiam/id6740481986)

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

**In-app purchases:** none


## Frequently asked questions

### Is FED free?

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

### Is IngSoft InterWatt (eIAM) free?

IngSoft InterWatt (eIAM) is free to download, with no in-app purchases.

### Do FED or IngSoft InterWatt (eIAM) have ads?

Neither FED nor IngSoft InterWatt (eIAM) shows ads.

### Which is updated more often, FED or IngSoft InterWatt (eIAM)?

FED ships an update every 4 months, and IngSoft InterWatt (eIAM) fortnightly. Most recently, FED was updated on September 20, 2026 and IngSoft InterWatt (eIAM) on September 24, 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.*