Dahlia Home review: Finally, I can repurpose my old iPhone as a smart home hub (said no one ever)

Here’s a truly innovative solution in search of a problem.

dahlia smart home primary
Christopher Null / IDG

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At a Glance

I want to give Dahlia Lights massive amounts of credit for the concept of Dahlia Home. Here’s the bold idea: Why monitor your smart home through the devices themselves? Instead, why not use a live video feed of a room to determine what’s happening, and then create rules to control your devices based on what the camera sees?

OK, it’s a little convoluted, so let me back up a bit. Dahlia Home is a smart home system that runs not on sensors and other gadgets, but instead fits entirely on a smartphone—a couple of iPhones, to be precise (Android phones are not supported at present.) Your primary phone runs the Dahlia Home app (more on this in a bit). Your secondary phone (that old iPhone 5 that’s festering in a drawer) runs the Dahlia Home camera app.

dahlia smart home 1 Christopher Null

My jerry-rigged camera setup is not exactly a style-forward design.

You prop the phone running the camera app in a corner of your room, so it can keep tabs on what happens within it, using cloud-based computer vision to determine how many people are in the room, if the TV is on, and so on. In the main Dahlia Home app, you use these conditions to code rules using IFTTT. For example: If two people are in the room and the TV is on, the rule can be set to dim the lights and lock the front door. Since this is done via IFTTT, not Dahlia’s own system, your options here are virtually limitless.

Yeah, it’s still a little convoluted. And that’s probably the biggest issue any user is likely to have with Dahlia: It just doesn’t make a whole lot of sense.

dahlia home 2 Christopher Null / IDG

My setup experience was filled with errors like this.

First, setting up Dahlia isn’t easy. I encountered numerous roadblocks getting the apps on the two phones to talk to each other, and while a tech-support call to Dahlia helped get things running, even the company confessed what I was seeing on my screen wasn’t supposed to be there. A little brute force got me through it, though that meant setting up the same room four different times.

I eventually got things working, and as part of the configuration, you’re directed to place your secondary smartphone (the one you’re using as a camera) in an appropriate place in the room you want to monitor. This is tricky, because the camera needs to survey the whole room, including any television screens and places where occupants frequently sit. A cell phone is not exactly designed to sit high up on a shelf and look down on anything, and even with a stand (Dahlia sent something like this) positioning it so that it didn’t primarily focus on my ceiling was quite difficult.

Even more problematic is that once you aim the phone’s camera, it can’t be moved—at all. Dahlia notes that it’s very hard to reconfigure the hotspots upon which Dahlia’s app acts, so you must trust that a pet, child, or housekeeper will not jostle the phone, even a little bit. Moving the phone even a fraction of an inch will completely ruin your setup and the system won’t work.

If you want to use Dahlia in multiple rooms, you’ll need multiple phones, and that’s an idea that starts to get a little crazy. The free version of the Dahlia Home app is also good for only one phone/room combination. You’ll pay $4.99 per month if you want to upgrade, at which point you'll be limited to a maximum of five rooms.

dahlia home example of screen burn in Christopher Null

Leaving any smartphone on 24/7 will inevitably result in image burn-in.

Should you be concerned about the privacy implications of a smartphone camera aimed at you and your living room or bedroom 24/7? Dahlia says you needn’t be, that “images are securely sent to our servers and promptly deleted after our computer vision algorithms are done.” This assurance wasn’t enough to make me altogether comfortable with this idea. Similarly, I’m not sure having a smartphone, set to “never sleep” and constantly snapping pictures, makes great environmental or technological sense. After just a few days of testing, the smartphone operating as a dedicated camera was suffering from severe screen burn-in.

The app did work, more or less. I configured the system via IFTTT—which requires walking through a laborious, non-intuitive process that includes downloading your IFTTT API key and copying arcane event names into the service.

dahlia home 3 Christopher Null / IDG

Once configured, you define the activities upon which Dahlia will act.

I created a rule that would turn off a light when it detected my TV was on and someone was in the room watching it. The rule worked as promised, but the elapsed time for this to work was awfully variable. Sometimes the light would shut off a few seconds after the TV turned on, while other times it would take half an hour. (Note that the free plan specifies actions will have a 30-second delay.) I will grant that my large living room may have made it more difficult to accurately cover with the camera. Smaller rooms might fare better.

Lastly, there’s the fact that, even discounting all the issues mentioned above, the system is simply not all that useful. If you really want to turn off a light while the TV’s on, there are myriad and easier ways to accomplish the same thing. You can use inexpensive smart devices like smart switches or plug-in outlets; or if you have a smart TV, simply have the television talk directly to IFTTT without involving a middleman.

I’m sure there’s a use case that renders this convoluted smart home system compelling. I just haven’t figured it what it is yet.

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At a Glance
  • Using computer vision to intelligently control smart home features is an interesting concept, but this implementation isn’t ready for prime time.


    • It's an interesting concept
    • No-risk trial (it's free to use provided you have a spare iPhone)


    • Extremely buggy—and difficult—setup routine
    • Moving the camera, even a little, will ruin your setup
    • Do you really want eyes on any room in your home 24/7?
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