EMA App vs Tesla One
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
EMA App
Monitor your solar energy system's performance in real-time and review historical data. Track power output, environmental benefits, and system details for APsystems microinverter users.
- Real-time output power display
- Historical power output tracking
- Environmental benefits monitoring
- Daily, monthly, yearly, and lifetime output review
- System registration and equipment profile
- Installer contact information
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EMA App is an energy monitoring application for smart phones, designed for end users of APsystems microinverter products. Users can check the real-time performance, historical power output, and environmental benefits of their PV system. Main function: -Display the system real-time output power -Dynamically switch between PV system historical output power and environmental benefits -Monitor and review system output by Day, Month, Year and Lifetime of the PV array -Display the registration information, equipment profile and installer contact information for the PV system
Tesla One
This app helps Tesla employees and partners manage daily operations, including customer education and support. It's also used by certified installers and electricians for preparing, installing, and commissioning Tesla products.
- Manage daily operations
- Customer education
- Customer support
- Prepare installations
- Install and commission products
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Tesla One is for Tesla employees and partners to manage their daily operations and functions. Tesla employees can manage their daily operations ranging from customer education to customer support. Certified installers, partners, electricians, and Tesla employees can use Tesla One to prepare, install, and commission. Important: This app is designed exclusively to support Tesla Employees, certified installers, and partners.
Screenshots
Verdict
The clearest difference is rating: Tesla One at 3.0 against EMA App's 2.5. Tesla One also leads on update cadence (every 6 days vs every 2 weeks). On price, review sentiment, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Tesla One holds the better App Store score, 3.0 against 2.5. Both are backed by a comparable volume of ratings — 112 and 307 respectively. Written reviews complicate that: 26% of EMA App's written reviews are positive against 21% of Tesla One's, so the app with the better star average is not the one people write more warmly about.
EMA App ships an update every 2 weeks, Tesla One every 6 days. Both last shipped on October 17, 2026.
| Parameter | EMA App | Tesla One |
|---|---|---|
| Price | Free | Free |
| Rating | 2.5 (112 ratings) | 3.0 (307 ratings) — better |
| Positive reviews | 26.4% of reviews — better | 21.5% of reviews |
| Number of ratings | 112 | 307 — better |
| Update frequency | Every 2 weeks | Every 6 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 259 MB | 289 MB |
| Age rating | 4+ | 4+ |
| Developer | Altenergy Power System,Inc. | Tesla, Inc. |
Customer experience
EMA App
Tesla One
User reviews
EMA App
From 112 App Store ratingsWhat we love
- ✅ Accurate solar panel energy production tracking
- 📊 Clear and easy-to-understand data visualization
- 🌍 CO2 reduction metrics display
- ⚡ Reliable hardware performance
- 📱 Basic functionality works when operational
Room to improve
- 🐛 Frequent app crashes and freezes
- 🔌 Unreliable connectivity and offline issues
- ⏰ Data consistently 10-15 minutes to hours behind real-time
- 🌙 Night mode/dark mode won't persist after closing app
- ⚙️ Settings not retained between sessions
Tesla One
From 307 App Store ratingsWhat we love
- ✅ Seamless commissioning experience for wall connectors
- 👍 User-friendly interface once login method is understood
- 🎓 Excellent installer training videos and educational content
- 🔧 Ability to manage WiFi settings and device configuration
- ⚡ Works flawlessly on Android devices
Room to improve
- 🐛 Frequent app freezing and crashes
- ❌ Non-functional for regular consumers/homeowners
- 🔐 Confusing login process and unclear authentication requirements
- 📱 Significant iOS/iPhone compatibility issues
- ⚠️ Removed web interface forcing mandatory app usage
Bugs and requests
EMA App
Reported bugs
20 issues- App won't open on iPad after recent updates
- Night/dark mode doesn't persist when app is closed
- Login screen infinite loading circle
- App crashes regularly and becomes unusable
- Data page requires manual selection every time to display information
Show 15 moreShow fewer
- Zoom feature too sensitive and uncontrollable
- Environmental Protection Benefit data resets after firmware updates
- App offline more often than online
- Cannot edit user ID after installation
- Privacy Policy agreement screen unresponsive
- Version number doesn't update correctly after app updates
- No data displayed after latest updates
- App doesn't show 2025 year
- Panels stop generating power without notification
- Data missing until after sunset
- App requires reinstall to regain access
- Module page disappeared in recent updates
- App only works on home WiFi, not cellular data
- Slow data refresh rates (5-minute intervals)
- Inconsistent date handling
Requested features
20 requests- iOS widgets for home screen and lock screen
- Apple Watch app and watch face widgets
- iPad app with landscape mode support
- Auto-refresh functionality for live data updates
- Persistent login credentials
Show 15 moreShow fewer
- Automatic dark mode based on system settings
- 13-month view instead of 12 months for year-over-year comparison
- Month and year navigation by month/year instead of daily increments
- CSV export functionality for data
- Real-time data instead of delayed updates
- Home energy consumption and grid export data display
- Ability to set custom billing period dates
- Alert notifications for system failures or low production
- Zoom control for data charts
- Realistic panel layout configuration
- Historical data access by clicking on specific dates
- Live Activities feature
- Ability to edit user ID and account details
- Messaging system for alerts
- Referral tracking system
Tesla One
Reported bugs
14 issues- App freezes on Face ID authentication screen
- Crashes when scanning QR codes or barcodes
- Unable to access jobs/equipment on install screen (iPhone)
- App fails to connect to Powerwalls and wall connectors
- Barcode scanning functionality unreliable
Show 9 moreShow fewer
- Phase detection failures during commissioning
- App not saving device information after failed setup attempts
- Login credentials rejected despite correct username/password
- Mobile badge feature missing on iPhone despite rollout promises
- Grid charging settings being reset unexpectedly
- WiFi connection lost immediately after configuration
- App unresponsive when selecting products (e.g., Powerwall)
- Clock in/punch functionality not working properly
- App not refreshing on Tesla WiFi or mobile data
Requested features
10 requests- Restore web interface for direct IP address access
- Offline mode for clocking in/out without WiFi
- Remove location permission requirement for time punch
- Simplify login process with clearer instructions
- Add troubleshooting video content
Show 5 moreShow fewer
- Restore granular backup reserve percentage control
- Enable consumer/homeowner access without employee credentials
- Improve WiFi network compatibility (WPA3 support)
- Integrate scheduling functionality into main Tesla app
- Mobile badge functionality for iPhone users
In-app purchases
EMA App
No in-app purchases
Tesla One
No in-app purchases
