Emoncms vs Zap Panels
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Emoncms
This application allows users to view energy, temperature, and environmental data dashboards from Emoncms servers. It is an open-source tool designed for processing, logging, and visualizing environmental information.
- View Emoncms dashboards
- Supports MyElectric dashboards
- Connects to emoncms.org
- Connects to custom Emoncms servers
- Open-source application
- Visualizes energy data
- Visualizes environmental data
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Open-source Emoncms dashboard viewer. View MyElectric Emoncms dashboards from http://emoncms.org or any other Emoncms server. Emoncms is an open-source web application for processing, logging and visualising energy, temperature and other environmental data developed as part of the http://openenergymonitor.org project. OpenEnergyMonitor is a project to develop open-source energy monitoring tools to help us relate to our use of energy, our energy systems and the challenge of sustainable energy. https://github.com/emoncms/emoncms-ios For support or to get involved with development please post on the forum: https://community.openenergymonitor.org/c/emoncms/mobile-app
Zap Panels
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Zap Panels gives your Tesla Powerwall a simple, stylish, dedicated in-home display. A real-time dashboard showing exactly what your home energy system is doing right now. Ideal for wall or desk mounted displays. Monitor live power readings across solar generation, home consumption, battery charge and grid import/export. The home consumption breakdown shows exactly where your energy is coming from at any moment. Daily kWh totals, tariff cost tracking and a personalised solar generation forecast give you the full picture of your energy use. Octopus Agile customers can view live half-hourly import rates directly on the dashboard, updated automatically throughout the day. Intelligent Octopus Go users can view current tariff status, peak/off-peak and upcoming dispatch slots. Features • Live solar, home, battery and grid power readings • Home consumption breakdown by source: solar, battery and grid • Octopus Agile half-hourly import rates • Intelligent Octopus Go slots and rates • Daily kWh totals for all energy flows • Tariff cost tracking: import costs, export earnings and net daily spend • Solar generation forecast, auto-calibrated to your real system over time • Weather forecast • Full screen and landscape view for a dedicated energy display • Dark mode and light mode • Panel drag-to-reorder • Configurable poll speed, font size and display settings • Keep screen on mode for always-on display • Screen dimming scheduler • In-day charts • Historical charts with comparison tool • Data export • 14-day free trial, no subscription, one-time purchase to unlock premium features Not affiliated with or endorsed by Tesla, Inc. or Octopus Energy Ltd. Requires a Tesla Energy account.
Screenshots
Verdict
The clearest difference is in-app purchases: Emoncms at none against Zap Panels's 1. Emoncms also leads on iOS requirement (13.0 vs 17.0). Zap Panels's advantage is update cadence (every 3 weeks vs every 17 months). On price, ads and device support 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. Zap Panels sells 1 one-off in-app purchase. Emoncms asks for nothing beyond the download.
Emoncms ships an update every 17 months, Zap Panels every 3 weeks. The most recent releases landed on November 2, 2026 and October 24, 2026 respectively.
| Parameter | Emoncms | Zap Panels |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (5 ratings) — better | — |
| Positive reviews | 55.6% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 17 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 36 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Megni | William Lee |
In-app purchases
Emoncms
No in-app purchases
Zap Panels
- Zap Panels Premium$4.99









