RenderFocus is a kernel-level CPU management utility for Apple Silicon Macs that routes background applications to Efficiency cores while reserving Performance cores for a user-selected priority application. The app targets users running compute-intensive workloads such as Xcode builds, Blender renders, or video exports. ($2.49/month, $11.99/year, or $24.99 one-time)
Focus Mode assigns exclusive P-Core access to a chosen application via the taskpolicy(2) API. Auto-Focus extends this behavior by activating automatically whenever a tracked app gains foreground status through NSWorkspace. Beast Mode adds system-level throttling across all background processes simultaneously, including a 5-second cooldown that prevents rapid state cycling. E-Core Jail enforces permanent background restrictions with a 5-second monitoring interval, while Deep Freeze sends SIGSTOP signals to halt selected processes entirely.
Additional capabilities include Fan Control with direct SMC access capped at 85°C, Memory Purge via the system purge command, and a GPU Monitor powered by the Metal API for real-time Unified Memory visualization. Version 1.2 introduced a Scheduler for time-based automation rules, Workspace Profiles for pre-configured optimization sets, RAM Monitor with auto-purge on memory pressure, and a Dashboard providing a unified view of all active modes and statistics.
Resource usage is minimal: approximately 30 MB for the menu bar interface and 5 MB for the background daemon, with CPU impact under 0.1% using adaptive polling.
System requirements: macOS 13 Ventura or later. Apple Silicon only (M1, M2, M3, M4); not compatible with Intel Macs. Requires installation of a LaunchDaemon and privileged helper tool. App is Apple Notarized and operates within the SIP sandbox without requiring SIP to be disabled.
Pricing: ($2.49/month, $11.99/year, or $24.99 lifetime one-time). 14-day free trial available. No Mac App Store version; purchased directly via the developer’s website through Paddle.
Limitations: Exclusively supports Apple Silicon; Intel Macs are unsupported by design. Cannot freeze Apple system processes such as Finder, Dock, Spotlight, WindowManager, or Control Center. The focused application itself cannot be frozen. Beast Mode enforces a 5-second mandatory cooldown. Elevated privileges require a LaunchDaemon installation during setup.
Alternatives: TG Pro ($10, one-time) offers fan and thermal management with temperature monitoring but no CPU core routing. iStat Menus ($11.99/year or $14.99 one-time) provides comprehensive system monitoring without process priority scheduling. No direct alternative exists for P-core/E-core routing; macOS Activity Monitor provides limited process priority control via command-line nice/renice.
Suitable for users running demanding workloads on Apple Silicon Macs who want deterministic CPU core allocation during renders, compilations, or exports without resorting to manual command-line tools.
