▁shapes , ▁such ▁as ▁o , ▁e , ▁and ▁s , ▁are ▁round ▁in ▁SF , ▁whereas ▁they ▁are ▁flat ▁in ▁SF ▁Comp act . ▁The ▁flat ▁sides ▁allow ▁the ▁letters ▁to ▁be ▁laid ▁out ▁with ▁more ▁space ▁between ▁them , ▁thereby ▁making ▁the ▁text ▁more ▁leg ible ▁at ▁small ▁sizes , ▁which ▁is ▁particularly ▁important ▁for ▁the ▁Apple ▁Watch . ▁ ▁Both ▁SF ▁and ▁SF ▁Comp act ▁each ▁have ▁two ▁optical ▁sizes : ▁" display " ▁for ▁large ▁and ▁" text " ▁for ▁small ▁text . ▁Comp ared ▁to ▁display , ▁the ▁letters ▁in ▁text ▁have ▁larger ▁a pert ures ▁and ▁more ▁gener ous ▁letter - sp acing . ▁The ▁operating ▁system ▁automatically ▁cho oses ▁the ▁display ▁optical ▁size ▁for ▁sizes ▁of ▁at ▁least ▁ 2 0 ▁points , ▁and ▁the ▁text ▁optical ▁size ▁otherwise . ▁Additionally , ▁included ▁in ▁mac OS ▁Sierra ▁and ▁iOS ▁ 1 0 ▁is ▁a ▁new ▁variant ▁named ▁SF ▁Comp act ▁R ounded . ▁It ▁is ▁used ▁in ▁the ▁new ▁contact ▁placeholder ▁icons ▁introduced ▁in ▁the ▁OS es . ▁ ▁In ▁iOS ▁ 1 2 . 2 ▁beta , ▁SF ▁Pro ▁R ounded ▁( cod ename ▁SF UI R ounded ) ▁was ▁found . ▁It ▁was ▁officially ▁released ▁on ▁the ▁Apple ▁Develop er ▁website ▁on ▁June ▁ 3 , ▁ 2 0 1 9 . ▁ ▁SF ▁Mon o , ▁which ▁is ▁a ▁mon osp ac ed ▁variant , ▁was ▁introduced ▁at ▁W W DC ▁ 2 0 1 6 . ▁It ▁is ▁installed ▁as ▁default ▁in