Are these compatible with Chromebooks?

Yes. MakeCode website works great on Chromebooks as has been mentioned. You can also program in CircuitPython very easily. I've had success using the Caret editor on Chromebook for editing circuit python programs.

The neopixels have a variable brightness and color so brightness depends of the color selected and brightness you set. The brightest is white at the highest setting. They are quite bright. Most demo programs set the brightness at 30% so it isn’t objectionable.

Just receive this and downloaded ide for windows, but which “board” is this called? trying to find the right instructions from the arduino site. ty

circuit py. Use ADAFRUIT's website the have great guides!

How many leds can this control?

Directly from the board pinouts, it could control 8 old-fashioned LEDs directly. Typically people would get a string of "smart" LEDs (such as NEOPixels). It would be possible to control 100's of them (but you might need a separate power source). Note, Adafruit's website has lots of support information and user projects.

Processor	48 MHz cortex
RAM	LPDDR3
Chipset Brand	arm
Wireless Type	Infrared
Brand	Adafruit
Series	Circuit Playground Express
Operating System	CircuitPython
Item Weight	0.01 ounces
Package Dimensions	5.71 x 3.66 x 0.28 inches
Processor Brand	ARM
Number of Processors	1
Manufacturer	Adafruit
ASIN	B0764NQ1WW
Is Discontinued By Manufacturer	No
Date First Available	October 3, 2017

Adafruit Circuit Playground Express

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