which program do they use to make watchfaces

The easiest, for a non-programmer, is using a watch face builder like the one at https://garmin.watchfacebuilder.com/

Otherwise, you can use the Connect IQ SDK from Garmin: https://developer.garmin.com/connect-iq/overview/ 

thank you

Hi,

you can also have a look at the M2 watchface project:

https://forums.garmin.com/developer/connect-iq/f/showcase/213203/watchface-m2

The companion design app can be used to create the watch face on the watch itself and is rather easy to use.

best

thank you, this helps too.

but the links of the op comment are not complete, there is only the beginning and the end of  the urls and they are not clicable

"App store link to M2: apps.garmin.com/.../1b4e3210-8105-487b-9f3a-8d538e6fed55

Link to M2 Designer: apps.garmin.com/.../206c2756-5eee-47f2-a654-f32375dcbe02"

and i noticed that there are only digital watchfaces. analogic are not possible with this app?

Analogic watch faces are possible using type "hand" dials (the height parameter sets the length of the hand).

There is only one possible hand shape though and having dials to mark hours around the display is quite cumbersome.

these should work:

https://apps.garmin.com/en-US/apps/1b4e3210-8105-487b-9f3a-8d538e6fed55

apps.garmin.com/.../206c2756-5eee-47f2-a654-f32375dcbe02

thanks