Sunsynk Connect vs Voltbox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sunsynk Connect
Monitor and control your solar inverter system remotely from anywhere. View real-time energy generation, battery status, and grid/load statistics. Adjust inverter settings, share system access with installers, and receive event alerts.
- Real-time system monitoring
- Remote inverter settings control
- Plant connection sharing
- Octopus Agile integration (UK)
- Detailed reporting and export
- Event and alert notifications
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Sunsynk Logger App has been developed to help you get the most out of your Sunsynk inverter. It has been specially tailored for the customers and installers. Using the Sunsynk Logger app with your Sunsynk inverter gives you complete remote control of your system from anywhere in the world! Real-time Monitoring – The Sunsynk Logger App lets you monitor multiple stats such as energy generation, battery status, grid, and load statistics. Change Settings Remotely - You can control all settings on the inverter from your mobile phone or PC without having to visit the inverter in person. Sharing Plant Connection - Customers can share their connection with their installer, permanently or temporarily. If they need help with any settings or configuration on their system, or if the installer needs to run any diagnostic checks, there is no need to visit site. The customer can share their plant connection and the installer can run any diagnostics / make any configuration changes from their own account. Octopus Agile Intergration - UK users can use the Live Price feature, using this you can look at the live prices provided by Octopus Energy and amend your charge and discharge prices with those figures in mind. Reporting – Users can generate detailed reports and export them to a PDF file. You can generate reports an that day, week, month, and year, or you can create custom reports. Events / Alerts – The Sunsynk Logger app will notify you if there are any events such as any warnings or faults or if there is any sudden loss in power.
Voltbox
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Voltbox is a professional calculator toolkit for electricians, built around the NEC (National Electrical Code). Fast, accurate, and yours to own — pay once, keep it forever. 18 CALCULATORS Fundamentals (free) • Ohm's Law — voltage, current, resistance, power, series/parallel • Wire & Cable Sizing — NEC ampacity lookup Dwelling Load • Load Calculation — dwelling feeder/service sizing (NEC 220) • Range Demand — cooking appliance demand load (NEC 220.55) • Generator Sizing • Existing Load Evaluation — headroom check for adding new loads to an existing service Circuit Design • Voltage Drop — for any run length and load • Motor / Transformer Sizing — full-load amps per NEC 430 • Grounding & Bonding — NEC 250.66 / 250.122 • EV Charging — NEC 625 • HVAC Circuit Sizing • Feeder Tap Conductor — NEC 240.21(B) • Spa Bonding Exemption • Branch Circuit Sizing Installation • Conduit Fill — max conductors per conduit size, including bare wire • Box Fill — junction box conductor capacity • Conduit Bending — offset & 90° stub • Light Meter — jobsite illumination check against OSHA/egress/IES minimums WHY VOLTBOX • One-time purchase for Pro — never a subscription, never a recurring fee • Save and organize calculations by project • Built for the job site: fast, no clutter, no login screens, works with no signal • No account required — open the app and start calculating Ohm's Law and Wire Sizing are free. Unlock Pro once to get every other calculator. Voltbox is a reference tool based on the NEC. Always verify results against the current code edition adopted in your area and confirm compliance with a licensed electrician or your local inspector before performing any installation.
Screenshots
Verdict
The clearest difference is in-app purchases: Sunsynk Connect at none against Voltbox's 1. Sunsynk Connect also leads on iOS requirement (13.0 vs 15.0). Voltbox's advantage is update cadence (every 2 weeks vs monthly). 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. Voltbox sells 1 one-off in-app purchase. Sunsynk Connect asks for nothing beyond the download.
Sunsynk Connect ships an update monthly, Voltbox every 2 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.
| Parameter | Sunsynk Connect | Voltbox |
|---|---|---|
| Price | Free | Free |
| Rating | 2.1 (17 ratings) — better | — |
| Positive reviews | 19.5% of reviews | — |
| Number of ratings | 17 — better | — |
| Update frequency | Monthly | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 52 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | Sunsynk | GABRIELE CHESI |
In-app purchases
Sunsynk Connect
No in-app purchases
Voltbox
- Pro Unlock$8.99









