Comparison

Emoncms vs Zap Panels

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • View Emoncms dashboards
  • Supports MyElectric dashboards
  • Connects to emoncms.org
  • Connects to custom Emoncms servers
  • Open-source application
  • Visualizes energy data
  • Visualizes environmental data
Features
Read full description

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

About

Zap Panels

Features
Read full description

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

Emoncms4 screens
Zap Panels4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Zap Panels sells 1 one-off in-app purchase. Emoncms asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Emoncms versus Zap Panels: the parameters behind the verdict, then further details
ParameterEmoncmsZap Panels
PriceFreeFree
Rating4.4 (5 ratings) — better—
Positive reviews55.6% of reviews—
Number of ratings5 — better—
Update frequencyEvery 17 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size36 MB15 MB
Age rating4+4+
DeveloperMegniWilliam Lee

In-app purchases

None

Emoncms

No in-app purchases

1 purchases

Zap Panels

One-time1
  • Zap Panels Premium$4.99

Questions

Is Emoncms free?
Emoncms is free to download, with no in-app purchases.
Is Zap Panels free?
Zap Panels is free to download, with in-app purchases available.
Do Emoncms or Zap Panels have ads?
Neither Emoncms nor Zap Panels shows ads.
Which is updated more often, Emoncms or Zap Panels?
Emoncms ships an update every 17 months, and Zap Panels every 3 weeks. Most recently, Emoncms was updated on November 2, 2026 and Zap Panels on October 24, 2026.

Other comparisons