This is the first thing most people ask, and the answer is different depending on whether you buy an installed system or build it yourself. Both run from your phone. Where they split is what you have to install, and whether it still works when you are across town or out of state.
Do you have to install an app?
With an installed brand system, yes. You download that company's app on iPhone or Android, it pairs to the controller on your home WiFi, and that app is how you pick colors and set schedules. With a DIY build running WLED, no. The controller serves its own web page, so you just open a browser on your phone and go to it like any website. There are optional apps for it, but nothing you are required to install.
Can you control it when you are not home?
With most installed brand systems, yes. They connect out to the company's service, so you can change the lights from anywhere you have signal. It is worth asking before you buy, because it is not universal. With a plain DIY WLED build, no, not out of the box. It only answers on your home WiFi. You can add remote access with a VPN back to your house, or by running it through a home automation setup, but that is extra work and it is not the default.
The WiFi versus Bluetooth gotcha
Some cheap kits are Bluetooth only. That means you have to be standing within about thirty feet of the controller to change anything, so no scheduling from work and no changing it from the couch if the signal is weak. WiFi is what you want. Ask which one a system uses before you buy it, because the box does not always make it obvious.
What happens if the internet goes out
Schedules live on the controller itself, not on your phone, so the lights still come on and go off on time during an outage. Control from a phone on the same WiFi usually still works too. What stops is remote control from away and anything voice related, since both of those need the internet.
Voice assistants and smart home
Most installed systems tie into Alexa or Google so you can just say turn the lights on. WLED has Alexa support built in and works with Home Assistant if you run one. None of it is required. Plenty of people set a schedule once and never touch it again.
Can more than one person control it?
Yes on both. On an installed system, family members log into the same account on their own phones. On a DIY build, anyone on your home WiFi can just open the page, which is convenient but does mean anyone on your network can change your lights.
Home hubs and automations, and why being away does not matter
This is the part people get backwards. Your automations do not run on your phone. They run on the hub, and the hub is sitting at your house. So if you have Home Assistant or a similar hub running an automation like turn the lights on at sunset, or flash them when the camera sees motion at the gate, that keeps firing whether you are on the couch, at work, or out of state. You leaving has nothing to do with it. Remote access only matters when YOU want to reach in and change something by hand.
Which setups actually play well with a hub
A DIY WLED build is the strongest here, which surprises people who assume the expensive system is more capable. Home Assistant has a built in WLED integration that finds the controller on your network on its own, and WLED also speaks MQTT and has a plain web API. That means any hub can drive it, and you can trigger the lights off anything the hub knows about: a door sensor, a camera, sunset, a schedule, someone arriving home.
Where brand systems get limited
Installed brand systems usually connect to Alexa or Google, which is fine for saying turn the lights on. What a lot of them do not give you is a local connection your hub can talk to directly, so your automations end up limited to whatever the voice assistant exposes, often just on, off, and maybe a color. If running this from your own hub matters to you, ask specifically whether the system has a local API or a Home Assistant integration before you buy, not just whether it works with Alexa.
What happens to automations when the internet drops
It depends entirely on where the automation lives. A local hub talking to lights on your own network keeps running through an outage, because nothing it needs is outside the house. Anything cloud based stops: Alexa routines, Google, and most brand app scheduling. That is the practical argument for keeping the lights and the hub local, especially on this coast where the power and the internet both take storm hits.
Presence and geofencing
Automations based on you arriving or leaving are the one case that does need the internet, because your phone has to report its location back to the hub. If the internet is down, a sunset schedule still fires but a welcome home trigger will not.
- Installed brand systems use their own app on iPhone or Android
- A DIY WLED build needs no app at all, it serves a web page you open in a browser
- Most installed systems let you change the lights from anywhere, DIY is local only unless you add a VPN or home automation
- Avoid Bluetooth only kits, you have to be within about thirty feet
- Schedules run on the controller, so lights still work during an internet outage
- Alexa and Google work with most installed systems, and WLED has Alexa support built in
- Automations run on the hub at your house, so they keep working while you are away
- WLED has a built in Home Assistant integration plus MQTT and a web API
- Many brand systems only expose Alexa or Google, which limits what a hub can do
- Local hub plus local lights keeps running through an internet outage
