This feature is made for people who want a clear rule for what “expensive” and “cheap” means - not just the absolute lowest hour of the day. WattSmart lets you compare each time interval (hourly or 15-minute) against a selected benchmark average - or against a price level you set yourself.
Instead of guessing, you get three simple labels across the app:
- High - above your acceptable range
- Low - below your acceptable range
- Acceptable - within your acceptable range
How the price levels are calculated
WattSmart classifies every price point as High / Low / Acceptable relative to a reference average you choose in Settings.
1) Choose your comparison baseline (average)
You can select what “average” means for you, for example:
- Today’s average
- Last week’s average
- Last month’s average
- Last year’s average
- This year’s (YTD) average
- Custom price level (you set the number)
2) Set your Acceptable range (deviation)
You also set an allowed deviation (%) around the chosen average.
- Acceptable range =
average ± deviation%
3) Classify each time interval
For each hour (or 15-minute interval):
- High if
price > average + deviation% - Low if
price < average - deviation% - Acceptable if
average - deviation% ≤ price ≤ average + deviation%
This turns raw market data into a consistent, personal “price signal” you can use every day.
Custom price level: the “geek mode” feature
The Custom price level option is for users who want to define their own “fair” price instead of using historical averages.
Typical use cases:
- You know your tariff structure and want a strict threshold.
- You track household budget and need a clear “good enough” band.
- You want one stable reference level for the whole season.
With a custom level + deviation, you effectively create your own personal acceptable price corridor.
One color logic across the whole app
WattSmart uses the same logic everywhere, so you don’t have to re-interpret charts on every screen:
- High = red
- Low = green
- Acceptable = blue
This color meaning is consistent across:
- Today & tomorrow price table
- Today & tomorrow price chart
- Home screen widgets
- Any place where price intervals are highlighted
How it connects to “Cheapest and Most Expensive Price Hours”
When you use price levels (High/Low/Acceptable), the “Cheapest and Most Expensive” feature can group time intervals by the same thresholds:
- “Cheapest” intervals are the ones classified as Low
- “Most expensive” intervals are the ones classified as High
In other words, it’s not only about absolute min/max - it’s about your chosen benchmark average ± deviation, which is often more useful for real-life planning.
Why compare to averages at all?
Absolute cheapest hours are great, but averages unlock more control:
- You can avoid “high” intervals without chasing the single lowest point.
- You can plan appliance usage based on a stable rule.
- You can track whether today/tomorrow is generally expensive or generally cheap.
Settings recap
To use this feature, configure two things in Settings:
- Reference price (day/week/month/last year/YTD/custom)
- Allowed deviation (%) to define your Acceptable band
Once set, the same thresholds drive the entire app UI - tables, charts, and widgets.