# Watto — Hourly Electricity Prices

> Hourly Electricity Prices (iPhone/iPad app by Erik Aigner.)

- Source: https://appshunter.io/ios/app/watto/id6462795022 (this page in markdown: same URL + `.md`)
- Developer: [Erik Aigner](https://appshunter.io/developer/422975586)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 18.0 · 4 MB
- Languages: American English, German (Germany)
- Released: 2026-06-21
- Data updated: 2026-08-27
- User reviews in markdown: https://appshunter.io/ios/app/watto/id6462795022/reviews.md

## What is Watto?

- Hourly prices for EPEX SPOT AT and DE
- Shows you the best times to charge
- Calculates the real price based on your fee structure
- Alerts you when the price drops below a set limit
- See historical data like average price per week and best weekday


## Version history (last 5 releases)

### 1.4.0 — 2026-08-26

Watto is now free.

### 1.3.0 — 2026-07-08

- Clearer cheapest-time results with visual dividers for larger price jumps
- New setting to adjust price segmentation sensitivity
- Improved Analyze tab layout and smoother chart interaction
- Weekday analysis now ranks the cheapest days more clearly
- More accurate price calculations, including edge cases around fees and VAT
- Fixed Central European daylight saving time handling
- Improved price alert behavior when notification permissions are disabled
- Better formatting for prices and percentages
- Improved layout support for larger text sizes
- New ad-supported mode, with an optional ad-free subscription for supporting Watto
- General performance, reliability, and UI improvements

### 1.2.1 — 2026-06-19

- Fixes and performance improvements

### 1.2 — 2025-09-18

- Update for iOS 26

### 1.1 — 2025-07-09

- Add reminders for the chosen period
- Notification when the energy price rises above a set limit

## Related topics

[erik aigner](https://appshunter.io/ios/topics/erik-aigner)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*