# Brownout vs Postfach

The clearest difference is in-app purchases: Brownout at none against Postfach's 1. Postfach's advantage is update cadence (every 2 days vs every 3 weeks) and iOS requirement (18.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Postfach sells 1 one-off in-app purchase. Brownout asks for nothing beyond the download.

Brownout ships an update every 3 weeks, Postfach every 2 days. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Brownout | Postfach |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free | — |
| Size | 1 MB | 22 MB |
| Requires iOS | 26.0 | **18.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Bitz](https://appshunter.io/developer/434213281) | [esense GmbH](https://appshunter.io/developer/1545555949) |

## What reviewers say

### Brownout

[App page](https://appshunter.io/ios/app/brownout/id443661505)

Easily check Japan's electricity demand forecast across 10 regions. View actual demand, forecasts, and supply capacity with clear daily line charts. Stay informed about the power situation from Hokkaido to Okinawa.

**Highlights:** Electricity demand forecasts for 10 Japanese regions, Actual demand, forecast, and supply capacity charts, Real-time usage rate display, Easy region switching, Data from regional power companies

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

**In-app purchases:** none


### Postfach

[App page](https://appshunter.io/ios/app/postfach-private-mail/id6809901522)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Postfach Pro | $22.99 | one-time |


## Frequently asked questions

### Is Brownout free?

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

### Is Postfach free?

Postfach is free to download, with in-app purchases available.

### Do Brownout or Postfach have ads?

Neither Brownout nor Postfach shows ads.

### Which is updated more often, Brownout or Postfach?

Brownout ships an update every 3 weeks, and Postfach every 2 days. Most recently, Brownout was updated on November 1, 2026 and Postfach on November 6, 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.*