San Francisco is a font released by Apple in 2014. Similar to Googles corporate font Product Sans, San Francisco is only allowed to be used as a system font for Apple products and apps running on them. The neo-grotesque font shares a lot of similaritiers with the Graphik typeface like the rounded G,the straight a-stroke or the round dots. The upper- and lowercase k however, are closer to Helvetika.
Inter was released in 2017 by Rasmus Andersson. The font is extremely similar to San Francisco and you really have to get into the details to see the difference. The most noticeable difference might be the lowercase a, which is more similar to Helvetica than to San Francisco. Overall Inter is one of the highest quality open source fonts available and comes in two variable cuts with all special characters you can think of. You might want to take a look at the official Inter website to get more inforamtion.
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