The best smart Christmas lights

For a facade or a large tree, the Twinkly Strings 250 - per-LED addressing plus a mapping step that makes effects follow the shape you actually hung. For a normal living-room tree, the 100-LED green wire version does the same thing at the right scale and price.

The distinction worth understanding before you spend: a set that changes color is not the same as a set that runs effects. Per-LED addressing is what lets light travel along a string instead of the whole run blinking together, and it is the only reason these cost what they do.

None of these publishes a lumen figure, so brightness is not a criterion anyone can honestly rank on. What can be judged is what the control system actually does.

1. Addressing, stated plainly. Per-LED, segment-based or whole-string. This is the real difference and it is routinely blurred in marketing.
2. Scheduling. A seasonal display that runs itself gets used; one that needs a switch flipped does not. Every set here schedules in its app.
3. Wire color against the intended job. Trivial-sounding and highly visible by daylight.
4. Honest about the white. RGB white is mixed, not native, and none of these will match a dedicated warm-white set.

We did not test these. Every figure is the retailer listing's own, linked below, and where nothing is published we have written that rather than guessing.

Twinkly Strings 250 - the pick. 250 individually addressable RGB LEDs over 66.5 ft on black wire. The app maps the string after you hang it, so effects run across the actual shape rather than along an assumed straight line.
Who it is for: a facade, a large outdoor tree, or anyone who wants effects rather than a color. Who should skip it: anyone decorating a green indoor tree - black wire stripes it - and anyone whose display is otherwise traditional warm white.
Cons: by far the most expensive string here; RGB white will not match a warm white set; setup is a genuine setup; no lumen figure published.

Twinkly Strings 100 - for an indoor tree. The same addressing and mapping at 100 LEDs over 26 ft, on green wire that vanishes into branches.
Who it is for: a living-room tree where you want real effects. Who should skip it: a facade - 26 ft does not reach - and anyone expecting one set to light a tall tree.
Cons: still expensive per foot against a plain set; app setup required; RGB white is an approximation; no lumen figure.

Govee Christmas Tree Lights - the fastest tree. Twenty-four short strings on a common head, draped down the tree rather than wrapped around it. It is a genuinely quicker way to light a tree, and quicker still to take down.
Who it is for: anyone who dreads the wrapping. Who should skip it: anyone with an unusually small or unusually large tree - the drop length is fixed and it bunches or falls short.
Cons: sized for a particular tree height; no lumen figure; needs the app for anything beyond the default; no other use once the tree is down.

Govee Icicle Lights - for an eave line. RGBIC segments in the icicle format, so color can travel along the gutter rather than the whole run glowing one shade.
Who it is for: a gutter or eave run, and renters who want smart holiday lighting with nothing fixed to the house. Who should skip it: anyone on a quiet traditional street where a color-cycling eave will be the loudest thing on it.
Cons: no lumen or length figure published; icicle sets tangle badly; another Wi-Fi device per set.

Set the schedule once, in the first week. It is the feature that actually changes whether a display gets used, and the one people forget to configure - schedules and automations covers the general pattern.

Map before you finish decorating, not after. Twinkly's mapping needs to see the lights; doing it once the tree is fully dressed and the room is full of furniture is harder than doing it when you hang them.

Count your network devices. Each set is another Wi-Fi client. Three smart sets plus the rest of a smart home is a real load on a cheap router.