OS X Mavericks

<style>
.ios-ib th.ios-lab { background-color: #333; color: #fff; text-align: center; width: 28%; padding: 6px; }
.ios-ib td.ios-val { background-color: #fff; text-align: left; padding: 6px 10px; }
@dark { .ios-ib td.ios-val { background-color: var(--wiki-surface); } }
</style>
{| class="ios-ib" style="width: 100%; border: 2px solid #333; text-align: center;" darkstyle="border-color: #48484a;"
|-
| colspan="2" style="padding: 28px 20px 42px;" |
<div style="font: bold 2em/1.2 -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Helvetica, Arial, sans-serif; color: #333;" darkstyle="color: var(--wiki-color);">OS X Mavericks</div>
|-
! class="ios-lab" | Developer
| class="ios-val" | [[Apple]]
|-
! class="ios-lab" | Version
| class="ios-val" | 10.9
|-
! class="ios-lab" | Initial release
| class="ios-val" | October 22, 2013
|-
! class="ios-lab" | Final release
| class="ios-val" | 10.9.5 (September 2014)
|-
! class="ios-lab" | Price
| class="ios-val" | Free (first)
|-
! class="ios-lab" | Preceded by
| class="ios-val" | [[OS X Mountain Lion]]
|-
! class="ios-lab" | Succeeded by
| class="ios-val" | [[OS X Yosemite]]
|}

{{macOS Version Navbox}}

OS X Mavericks (version 10.9) is the tenth release of [[macOS]], shipped on October 22, 2013 — free, for the first time, ending the paid-upgrade era in one keynote line ("Today we announce a new era of the PC"). The naming changed eras too: the cats retired for California places, starting with the surf break.

The release itself was an engineer's year: timer coalescing, App Nap, and compressed memory stretched battery life measurably; Finder gained tabs and tags; and iBooks and Maps crossed from iOS.

= Features =

Free distribution; Finder tabs and tags; multi-display improvements (menu bars and Docks everywhere); timer coalescing, App Nap, compressed memory; iBooks and Maps; iCloud Keychain; and interactive notifications.

= Legacy =

Free OS upgrades reset the industry's economics — Windows followed within two years — and pushed the Mac fleet onto current releases, simplifying security and developer targeting permanently. The efficiency work quietly defined the modern MacBook's all-day battery.