WattWhen is a free energy-planning utility for German households that visualizes spot market electricity prices and simulates cost savings for appliances and solar panels.
The App DNA
What makes this app unique?
Users hire WattWhen to reduce electricity costs by shifting heavy usage to low-price windows, serving the need for financial control in a dynamic energy market.
For German households with dynamic electricity tariffs or balcony solar installations looking to reduce energy costs.
What does it look like?
Key features
Drag-and-drop interface for appliances to calculate cost differences.
Calculates optimal charging windows to minimize cost per kWh.
Simulates cost reduction impact of an 800W balcony solar panel.
How much does it cost?
The app operates as a free tool with no account requirement or visible monetization, relying on local device processing.
Velocity
Dormant developmentopaqueShow more...
WattWhen: Smart Energy DE has been inactive for 243 days, falling well outside the threshold for active development. With no updates released in over eight months, the app is currently in a zombie state. There is no evidence of ongoing feature development, bug fixes, or live operations support.
Who built it?
rohit aneja
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What do users think recently?
How are ratings & reviews evolving?
Not enough recent reviews to extract reliable themes yet.
Read the full review analysisCompetition
Competitive landscape for WattWhen: Smart Energy DE
How's the Utilities market?
WattWhen occupies a privacy-focused niche in the German Utilities category, relying on local processing to differentiate from cloud-based energy managers. The eight-month update gap signals a lack of competitive momentum against integrated utility-provider apps.
Read the market outlookThe rivals identified
Unlock the deeper market read.
Access the full report for freeThe Analyst's Read
Key takeaways for WattWhen: Smart Energy DE
Where is it heading?
The German energy-management market is consolidating around utility-integrated apps that offer automated device control. WattWhen remains exposed due to its manual-only interface and lack of recent development, so its survival depends on transitioning from a static dashboard to an automated smart-home controller.
- The eight-month update silence suggests the app is in maintenance mode, which prevents it from competing with active utility-provider apps.
- The privacy-focused, no-account architecture remains a stable differentiator that shields the app from the data-privacy concerns currently impacting larger energy-management platforms.
The SWOT
- Local-only calculation architecture ensures privacy compliance
- Zero-account requirement lowers initial barrier to entry
- Integration with smart-plug APIs could automate scheduling logic
- B2B partnerships with balcony solar retailers could drive acquisition
Next best moves
Pivot to smart-plug API integrations because manual scheduling is a high-friction barrier → increase daily active usage.
+ 1 more prioritized moveThe counter-intuitive read
The app's lack of cloud connectivity, often viewed as a weakness…
Read the full takeSince the last report: The app's competitive outlook has shifted to mixed due to prolonged inactivity, prompting a strategic pivot toward smart-home automation to maintain relevance.
Bottom line
WattWhen provides a useful, privacy-focused dashboard for energy planning, but the lack of active development and automated control makes it vulnerable to displacement by integrated utility apps, so the developer must prioritize smart-home API connectivity to remain relevant.
Unlock 2 critical frictions, 2 market threats, 1 more prioritized move and the analyst’s take.
Access the full report for freeSources
- [1] App Store, source
Report last updated