W vs CarHA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
W
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The W-Modbus app has arrived! Upgrade firmware for LumenRadio W-Modbus devices by connecting to and upgrading the LumenRadio Gateway in the network through the app. In the Network map you will find a system overview where you can see signal strength, edit names of wireless nodes as well as seeing the health of the RS485 bus including which Modbus RTU address that is connected to that wireless node. You can also connect to any node in the network and change their name (up to 20 characters). The W-Modbus app requires W-Modbus firmware 3.1.1 and above, which can be downloaded from the LumenRadio support webpage. Note that you need to install FW 3.1.1 or above on the gateway from the nRF connect app to enable the functionality. It is also required to have at least 3.0.0 or above on all nodes in the network. You will need to update all nodes individually if they are on version 2.2.3. This will be the last time this is required. All future updates can be done by either this app or from the nRF connect app.
CarHA
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CarHA lets you control your Home Assistant smart home directly from your car's touch screen while driving. Configure buttons for lights, switches, covers, and any Home Assistant entity. Monitor sensors, battery levels, water tanks, and power consumption — all from your car dashboard with large, color-coded buttons designed for driving. FEATURES - Control any Home Assistant switch, light, or automation - Monitor sensors in real time with WebSocket updates - Fully customizable tabs and buttons with colored icons - Supports multiple Home Assistant instances - Geofence zones — get notified or trigger automations automatically when you arrive near home, work, or any location - iOS Widget — check battery and sensor status from your home screen - Backup & Restore — export and import your configuration - Works over local network or remote connection (Tailscale, Nabu Casa) - No cloud, no subscriptions — connects directly to your server REQUIREMENTS - A running Home Assistant instance - Home Assistant URL and Long-Lived Access Token - iPhone with iOS 16+ - A car with a compatible car dashboard system CarHA is not affiliated with Nabu Casa, Inc. or the Home Assistant project.
Screenshots
Verdict
The clearest difference is price: W at Free against CarHA's $4.99. CarHA's advantage is update cadence (weekly vs every 2 months). On ads, in-app purchases, device support and iOS requirement 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
W is free to download; CarHA costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
W ships an update every 2 months, CarHA weekly. The most recent releases landed on September 24, 2026 and September 13, 2026 respectively.
| Parameter | W | CarHA |
|---|---|---|
| Price | Free — better | $4.99 |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15 — better | 16.6 |
| Further details — not scored | ||
| Size | 45 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | LumenRadio AB | Veghes Lucian |
In-app purchases
W
No in-app purchases
CarHA
No in-app purchases
