LeanFPS vs Shalltear Engine

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

LeanFPS compared with Shalltear Engine
Detail	LeanFPS	Shalltear Engine
What it does	Game optimizer for Windows 10 and 11 that detects games, applies tweaks by genre, measures FPS, and undoes every change	A free, lightweight C++ game engine with native scripting and hot reload
Stage	Startup	Not given
Founded	2026	Not given
Based in	Not given	Not given
Pricing model	Freemium	Free
Pricing	Free version with core tweaks and FPS measurement; Pro $19 one-time (early-bird price), $29 later. No subscription. First three games get full Pro features included.	Free to use with no fees, royalties, or revenue share. Full ownership of all created content.
Key features	Game detection by genre with icon display FPS and 1% low measurement per session Per-genre optimization profiles for eight genres Raw mouse input (mouse acceleration off for shooters) High performance power plan optimization Background app management and prioritization Laptop power mode optimization without permanent plan changes Session comparison with historical FPS data	Hot reload C++ scripting with state preservation Visual editor with dockable, detachable panels Prefabs with nested variants and live propagation Physics system with multiple joint types Audio mixer with effects and real-time processing Asset import from glTF, FBX, and multiple formats Standalone Windows x64 player with content cooking
What makes it different	One-time Pro payment with no subscription or monthly fees	Free and open-source with no royalties or revenue share Perpetual license terms that cannot change after build distribution
Community votes	0	0
DR (Domain Rating by Ahrefs)	3 no change since last check	1 no change since last check
Trust Flow (Majestic)	2	0
Citation Flow (Majestic)	28	13
Referring domains (Majestic)	14	4

5 details filled in for both companies.

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