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CLEO

Free#19 of 26 in Game Mod Loaders

CLEO: A focused script and plugin runtime for GTA and Bully modding. Ranked #19 of 26 in Game Mod Loaders by our editors (6.8/10); pricing: Open source; best for GTA and Bully script modding.

6.8/10Editor score

Visit CLEO

CLEO6.8 Visit CLEO

At a glance

Editor score
6.8 / 10
Pricing
Open source
Best for
GTA and Bully script modding
Paid from
Free
Plugin support
Yes
Facts checked
20 Sep 2026

Where it wins
- Runs custom scripts, missions and game features in supported titles
- Supports plugins, runtime extensions, and additional scripting commands
- Can be removed without modifying original game files
Where it doesn't
- Capabilities vary across CLEO releases and supported games
- Focused on script and plugin modding rather than a broad mod toolkit
- Platform support spans different Windows, mobile and console environments

Our verdict on CLEO

CLEO is an open-source scripting library and mod loader for players, modders and developers working with supported Grand Theft Auto games and Bully. It runs custom scripts from a dedicated CLEO directory, supports custom missions and game features, and can be removed without modifying the original game files. Supported releases cover GTA III, GTA Vice City, GTA San Andreas, GTA IV, Bully, GTA: The Trilogy - The Definitive Edition, re3, reVC, GTA Liberty City Stories and GTA Vice City Stories, with support spanning Windows PC, iOS, PSP and PS2 environments.

Its main strength is the range of scripting options within a focused mod-loading model. CLEO includes scripting opcodes and runtime extensions, while plugin support adds commands and functionality. CLEO Redux extends the ecosystem to JavaScript and TypeScript, and SDK resources support plugin developers. That combination gives players access to custom gameplay content while giving developers several ways to extend the runtime. The dedicated installation directory also keeps scripts separate from original game files, which supports a removable setup.

CLEO is most suitable for users who already know which game and release they want to modify, because it is a family of related releases rather than one uniform loader. Capabilities and supported games vary by version, and the Windows, iOS, PSP and PS2 environments do not represent one identical feature set. Choose CLEO for script-based GTA or Bully modding, plugin development, and JavaScript or TypeScript work through CLEO Redux. Users seeking one consistent loader across every listed platform, or a tool centered on mod types beyond scripts and plugins, should consider a different category fit.

Your product? Our editors can test CLEO in depth and publish a review, labelled as paid · from $149/mo →

CLEO pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.

See plans on cleo.li

CLEO fact sheet

Free plan	Not verified
Paid from	Free
Supported games	GTA III, GTA Vice City, GTA San Andreas, GTA IV, Bully, GTA: The Trilogy - The Definitive Edition, re3, reVC, GTA Liberty City Stories, GTA Vice City Stories
Supported platforms	Windows PC, iOS, PSP, PS2
Mod loading method	Script
Plugin support	Yes
Load-order control	Not verified
Mod profiles	Not verified
Dependency handling	Not verified
Deployment	Desktop, Mobile
Platforms	Windows, iOS
Support	Community, Docs
Built for	Solo, Small business (editorial estimate)
Pricing	Open source
Website	cleo.li
Facts checked	20 Sep 2026

Alternatives to CLEO

See all CLEO alternatives →

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Featured on iTechGuides

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update