Online Tuners for Violin
The following are open string tuning tones:
G string: https://www.youtube.com/watch?v=F7vwgGkIP7Y
D string: https://www.youtube.com/watch?v=dcUOW3Rua_Y
A string: https://www.youtube.com/watch?v=iY0BGDb40HE
E string: https://www.youtube.com/watch?v=OXTlOMgmybs
or you could use this one: https://fiddlerman.com/fiddle-learning-tools/online-tuner/
To check your tuning with the above tuning tones, here is a tuner. Please make sure your microphone is enabled: https://theonlinemetronome.com/free-online-tuner-for-musicians.html
Online Metronomes for Violin
A metronome is a device which prevents musicians from slowing down or speeding up throughout the piece.
If using the metronome is a bit intimidating for you, I can record the piece you’re working on with the metronome and you can play along at home.
Sometimes it may be hard and confusing for violin students to play with the metronome. Playing the violin with a piano accompaniment is another way to establish a steady beat. This can be found here.
Online metronome link: https://www.metronomeonline.com/
For more advanced students with subdivision included: https://www.imusic-school.com/en/tools/online-metronome/