WattWise
Gary Haslett Utilities iPhoneiPadiPod touch
WattWise is a free Utilities app for iPhone and iPad by Gary Haslett. Requires iOS 26.4. Updated May 12, 2026.
- Price
- Free
- on the App Store
- Size
- 2 MB
- Age 4+
- Updated
- May 12
- 2026 · v1.0
Screenshots
About WattWise
WattWise helps EV drivers estimate charging costs, compare charging rates, and understand every charging session before plugging in. Choose your charging rate, adjust your EV details, and instantly see estimated session cost, charging time, energy required, miles added, and cost per mile. WattWise is simple, private, and easy to use. Your charging sessions and tariff preferences stay on your device. Features: • Estimate EV charging session cost • Compare Off-Peak, Peak, Public, and Custom rates • Calculate charging duration • Estimate miles added • View cost per mile • Save recent sessions locally • Customise charging rate presets
App privacy
The developer, Gary Haslett, reported these privacy practices to Apple.
Data Not Collected
The developer does not collect any data from this app.
Alternatives to WattWise
Looking for apps like WattWise? Here are 6 similar apps on the App Store. The highest rated is WattKit: EV Cost Calculator (5.0/5), and all 6 are free to download.
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| WattWise | – | Free | May 12, 2026 | |
| JuiceCalc | – | Free | Jun 22, 2026 | Compare |
| WattKit: EV Cost Calculator | 5.0 / 5 (1) | Free | Mar 1, 2026 | Compare |
| EV CALC | 4.0 / 5 (1) | Free | Apr 24, 2025 | Compare |
| Pod Home | 1.0 / 5 (1) | Free | Oct 12, 2026 | Compare |
| Nextbase | 4.7 / 5 (563) | Free | Aug 31, 2026 | Compare |
| myenergi | 4.3 / 5 (67) | Free | Oct 22, 2026 | Compare |
Compare WattWise with the top alternatives: ratings, updates, ASO score and keyword gaps →