Fleasion is a desktop toolkit for intercepting, replacing, inspecting, previewing, converting, and exporting Roblox assets in real time.
Asset tooling in one place
Use Fleasion for asset replacement, cache exploration, Roblox client modifications, account-aware launch tools, proxy inspection, and conversion tools from one desktop app.
Build reusable replacement profiles with Roblox asset IDs, CDN URLs, and local files. Group rules, enable or disable profiles, import/export JSON, and use community presets.
Capture assets live, then search by ID, name, type, hash, or URL. Filter columns, inspect metadata, copy converted files, and export raw or converted assets.
Images, audio, JSON, texture packs, 3D meshes, and R6/R15 animations have purpose-built viewers—without leaving the dashboard.
Convert KTX textures to PNG, resolve texture packs, and move between Roblox mesh/CSG data and OBJ workflows in both directions.
Manage sounds, textures, default skyboxes, R6 avatar meshes, custom fonts, custom modifications, and client settings from the GUI.
Fleasion can override ClientSettings FastFlags through its proxy, with named profiles and live editing. This is an advanced feature with account risk—Fleasion warns before enabling it.
Read the FastFlag warning →Browse and join subplaces, work with job IDs and private-server links, keep favorites, and use proxy-aware launching where supported.
The Miscellaneous tab includes account management, browser-login import, multi-instance launching on supported setups, reserved-server tools, and client-side username display customization.
Fleasion exposes its proxy traffic UI for filtering, highlighting, preserving, forwarding, dropping, and auto-replacing requests in Env Proxy mode.
How it works
Fleasion routes Roblox Player asset traffic through a local HTTPS proxy. When Roblox requests an asset, Fleasion can let it through, replace it, remove it, redirect it, or capture it for inspection.
Technical details on GitHub →The desktop app starts its local proxy and lives in the system tray. Open the Dashboard whenever you want to configure or inspect it.
Create replacement profiles, enable client modifications, configure advanced FastFlags, or turn on the live scraper.
Env Proxy mode relaunches Roblox Player with a scoped proxy environment. A Hosts File compatibility mode is also available.
As assets are requested, Fleasion applies your rules and can collect originals into its cache viewer for preview, conversion, and export.
Cross-platform
Release builds are published for all three. Platform plumbing differs, but the dashboard and core replacement workflows travel with you.
Env Proxy runs the GUI as your normal user and scopes proxy settings to Roblox Player. Microsoft Store/Xbox Roblox has package-aware handling, with Hosts File mode available as a compatibility path.
Supports normal Roblox installations plus Froststrap-managed and AppleBlox custom paths. Release archives are built as universal macOS apps.
Fleasion supports the Sober Flatpak, including its asset overlay and FastFlag configuration, with Linux client behavior routed through a dedicated client registry.
Built for people who like digging
Dashboard, logs, cache deletion, settings, themes, run-on-boot, desktop integration, and more.
Orbit and FPS camera modes, grid/wireframe controls, vertex colors, and auto-rotation.
R15/R6 playback, freecam movement, playback timescale, and grid visualization.
Texture and model conversion happens locally so scraped assets are easier to inspect and reuse.
Multiple replacement configurations plus import/export keep experiments separate and portable.
Use the scoped Roblox Env Proxy by default or the legacy Hosts File route when compatibility requires it.
FAQ
For troubleshooting and feature-specific caveats, the GitHub README and Discord community have the most detail.
Download the standalone build for your platform from GitHub Releases. Python 3.14+ and uv are only needed if you choose to run or build Fleasion from source.
Replacement rules can target Roblox assets by ID or asset type and point to another asset ID, a URL, a local file, or an empty replacement to remove supported content. The scraper recognizes dozens of Roblox asset types.
No. Fleasion's normal replacement and capture workflows happen locally on your machine by intercepting Roblox Player traffic through a local proxy. Other players do not see your ordinary client-side asset replacements.
No. Roblox has stated that client modifications are not permitted, and game moderation can still take action. Custom FastFlags are especially advanced: they bypass Roblox's small locally permitted allowlist and may carry account risk. Fleasion displays a confirmation before enabling them. Use advanced modifications with your own judgment.
Use only the official GitHub Releases page. The project repository and Fleasion community links below are the canonical sources.
Ready when Roblox is
Grab the current standalone build, inspect the source, or join the community if you want help, presets, or project news.
