Apercu in action on canary.is

.header-1 { font-family: Conv_apercu_bold_pro; font-size: 30px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 42px; text-transform: none; color: #222222; }
.content-1 { font-family: Conv_apercu_light_pro_002, 'Helvetica Neue', Helvetica, Helvetica, Arial, sans-serif; font-size: 24px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 36px; text-transform: none; color: #222222; }
Apercu is available from Fontdeck.
Found by @mikesten on 5 Feb 2014.

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@mikesten

Apercu