MacBook Pro 13" 3 External Monitors
Why Ask Different Stack Exchange recommends it
Apple Stack Exchange answerers link it as proof that a stock MacBook Pro can drive more external displays than Apple officially supports, using USB display adapters.
Recommended by 1 people across 1 different months, 2015 to 2018.
What it is
A 2.5 minute demo by Michael Perry showing a mid-2014 13-inch MacBook Pro with Intel Iris graphics driving three external monitors. It uses a USB to HDMI adapter that acts as an extra display adapter, with no discrete GPU required.
What people said
Recommends smoosh911 · 2015-09 · Ask Different Stack Exchange · on “Can Mid 2015 Macbook Pro Run 3 External Monitors?”
You can run 3 to 4 external monitors (4 or 5 including the main screen). This is done through USB. By default you can only have 2 external monitors including your native display. But there is a way to add more. Here is how you do it: Get a USB to HDMI adapter (this serves as an external graphics card that pulls from your CPU). Plug adapter into your USB port Plug your HDMI into the adapter and connect to monitor. It's that simple. You can also get adapters for display port, VGA, DVI. This video demonstrates the steps above. [this video]
Recommends smoosh911 · 2015-09 · Ask Different Stack Exchange · on “How many monitors can the 13" retina MacBook Pro output to?”
You can run 3 to 4 external monitors (4 or 5 including the main screen). This is done through USB. This video explains everything. No discrete graphics card needed, just stock macbook. [this video]
Recommends smoosh911 · 2015-09 · Ask Different Stack Exchange · on “How many external displays can I power with the 15" retina MacBook Pro?”
You can run 3 to 4 external monitors (4 or 5 including the main screen). This is done through USB. By default you can only have 2 external monitors including your native display. But there is a way to add more. Here is how you do it: Get a USB to HDMI adapter (this serves as an external graphics card that pulls from your CPU). Plug adapter into your USB port Plug your HDMI into the adapter and connect to monitor. It's that simple. You can also get adapters for display port, VGA, DVI. This video demonstrates the steps above. [this video]
Cites Allan · 2016-10 · Ask Different Stack Exchange · on “Dual display with MacBook Pro (13-inch, Mid 2012)”
Your Mac technically can only support it's own internal display and one external display. However, there is a "hack" that you can use to get a 3rd screen (2nd external monitor) What you will need: mini Display Port to DVI cable/adapter [LINK] USB to DVI adapter [LINK] There's a [this video] with someone using this method with 3 external monitors (total of 4 screens) so this is entirely doable. Keep in mind that the bandwidth on USB is nowhere near the bandwidth of DisplayPort so there will be some lag when it comes to intensive video type applications. In other words, don't expect excellent results if you are gaming.
Cites Ruskes · 2018-09 · Ask Different Stack Exchange · on “Is there any screen with resolution of 3440x1080 that is supported by a mid 2012 13" MBP?”
Intel HD Graphics 4000 supports resolution up to 1920×1200 through HDMI and 2560×1600 through DisplayPort. Your Mac technically can only support it's own internal display and one external display. I say technically, since people are creative and here is an example of 3 external monitors. [this video]