Keelstrap

Getting started

1. Download the launcher. Use the button above. You get a single file, Keelstrap.exe — not a zip, not an installer.
2. Pick a folder for it to live in. Keelstrap asks where it should install itself on first run. Somewhere like C:\Users\you\Keelstrap works well. Don't put it inside the Roblox install folder.
3. Run Keelstrap.exe. It downloads the current Roblox client, applies your settings, and starts the game. After the first run, launching Roblox from the Start menu or desktop shortcut goes through Keelstrap automatically.
4. Sign in and play. Everything from here on is Roblox itself. Keelstrap stays in the background and keeps the client up to date.

Requirements

• Windows 10 or later (64-bit)
• An internet connection for the first download
• Roughly 500 MB of free disk space for the Roblox client

Updating

Keelstrap checks for a new version when it starts and updates itself in the background — there is nothing to reinstall. If Roblox ships a new client version, the launcher picks that up the same way.

To update manually, download the latest Keelstrap.exe from the button above and replace your existing copy. Your settings are kept.

Uninstalling

Delete the folder you chose during setup — that removes Keelstrap and everything it installed. There is no separate uninstaller and nothing is written outside that folder.

Activity

Recent commits from the GitLab repository, updated when you load the page.

FastFlags

FastFlags are internal Roblox engine variables. Keelstrap exposes the ones that matter in a searchable editor — type a name or pick a preset, press Enter, and it jumps straight to that setting. Everything you set is applied to the Roblox client before it launches, and Roblox itself decides which flags it actually accepts.

Roblox maintains an allowlist of client configuration flags; flags outside it may be ignored or reset by the engine. Keelstrap still lets you set anything, but a flag doing nothing is usually Roblox declining it, not a Keelstrap bug.

Presets included

• Enable fast GPU light culling — reduces CPU cost of lighting on integrated GPUs.
• Disable post-processing effects — turns off blur, bloom and color grading for extra FPS.
• Use gray sky — replaces the skybox with flat gray, cheaper to render.
• Show FPS counter — displays a live FPS readout in the corner.
• Disable telemetry — sets the flags Roblox uses to opt its client out of analytics reporting.

Flag presets

Presets are one-click bundles of flags grouped by what they do: mesh detail, anti-aliasing quality (MSAA), display scaling fixes, frame rate cap, rendering mode, and texture quality. Each preset only writes the flags it owns, so combining presets is safe — the FastFlag editor shows the exact values behind every preset.

Telemetry

Keelstrap itself has no telemetry, no accounts, and no analytics. The optional Disable telemetry toggle in FastFlags applies the client-side flags that opt the Roblox game client out of its own analytics reporting — it applies to Roblox, not to Keelstrap.

Appearance

Change the launcher's theme, accent color, and the icon used for Roblox desktop shortcuts. Custom icons are extracted from installed Roblox versions or supplied as your own .ico/.png files, then written into the shortcuts Keelstrap creates — your Windows Start menu and desktop entries pick them up automatically.

Mods

Drop client mods (textures, sounds, fonts) into the mods folder and Keelstrap applies them to the Roblox client on every update, so they survive version changes. Compatibility settings such as fullscreen optimization toggles live on the same page — they adjust Windows-level behavior around the game rather than modifying the client itself.

Integrations

Discord Rich Presence shows the game you're playing in your Discord profile. Activity tracking can display server location when the game exposes it, and can keep you in the desktop app instead of force-quitting the game on leave. All of these are off until you enable them, and all of them run locally on your machine.

Shortcuts

Keelstrap creates Start menu and desktop shortcuts that launch Roblox through the launcher. You can regenerate them, point them at specific launch modes, and reuse Roblox icons for the shortcut files so they look native.

Terms & Privacy

Keelstrap is free software, provided as-is with no warranty. It is an unofficial launcher and is not affiliated with or endorsed by Roblox Corporation.

Keelstrap does not collect, store, or transmit any personal information. It has no accounts, no telemetry, and no analytics. All files and settings live in the folder you choose during setup.

FAQ

Latest changes

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