Choose MediCat USB if you want the largest all-in-one bootable tool collection available — password removal, antivirus, data recovery, partitioning, and live OS environments — and you’re comfortable picking the right utility yourself. It boots the machine, so it works even when Windows won’t start. Best for personal and educational use; MediCat’s own docs warn against commercial use due to bundled-tool licensing.
Choose GRAM if you want a free repair USB with a built-in AI repair agent that reads the live machine’s diagnostics and walks you through the fix — no second PC needed to google an error. GRAM runs inside Windows (not from boot media), has clear commercial licensing for shops and MSPs, and needs a much smaller USB footprint.
MediCat USB is a community-built, all-in-one bootable toolkit (current release v21.12, ~21 GB download) that uses Ventoy to boot into a Mini Windows 10 PE environment or Linux live sessions, with dozens of bundled utilities for every rescue scenario. GRAM (Guardian Repair & Analysis Module) is a free Windows repair and diagnostics USB toolkit whose differentiator is an AI repair agent built into the environment. They work differently: MediCat boots the machine into its own PE desktop, while GRAM runs inside the live Windows session — plug in the USB, double-click Start GRAM, and work with the running system’s event logs, processes, and services in front of you.
Both are legitimate, widely used tools. This table is about fit — competitor details are sourced from medicatusb.com as of mid-2026.
| GRAM | MediCat USB | |
|---|---|---|
| What it is | Free USB repair & diagnostics toolkit with a built-in AI repair agent (Claude) | Free community-built multiboot USB toolkit (Ventoy + Mini Windows 10 PE + Linux live environments) with dozens of bundled utilities (v21.12 as of 2026) |
| Price | Toolkit free forever; AI is pay-as-you-go — credit packs from $25 (10 sessions) or seat plans from $49/mo | Free to download and use for personal/educational purposes |
| Core strength | Guided diagnosis — the AI agent reads the live machine and walks the fix step by step | Sheer breadth — password removal, antivirus (Malwarebytes, etc.), data recovery, disk partitioning, backup/cloning, and system diagnostics all on one stick |
| AI / guidance | Yes — conversational AI assistant plus scripted one-click diagnostics, security sweep, recovery, and imaging | None — you choose the right utility and interpret its output yourself |
| Boot model | Portable — runs inside the live Windows 10/11 session from the USB (runtime bundled, nothing to install); the machine must boot to the desktop | Bootable — boots the machine into a WinPE or Linux environment via Ventoy; works even when Windows won’t start |
| USB size | Small footprint; fits on an 8 GB+ drive | ~21 GB download; needs a 32 GB+ USB drive |
| Commercial licensing | Clear — free toolkit for anyone, paid AI with account support; licensed for commercial bench/MSP use | MediCat’s own docs state it is “NOT intended for commercial use” and warn that some bundled tools “may not be properly licensed” or “may be modified versions of commercial software” |
| Ideal user | Techs, MSPs, and capable consumers who want a second brain at the bench — especially in a commercial setting | Power users and hobbyist techs who want every possible rescue utility in one boot and are comfortable with manual tool selection |
| Notable limits | Not a boot disk — can’t help until the machine reaches the desktop; AI features need internet and paid credits; smaller third-party tool shelf | No guidance or automation; large download that triggers antivirus false positives during setup; licensing unclear for professional/commercial use |
Tool count, hands down. MediCat packs password-removal utilities, antivirus scanners (including Malwarebytes bootable), multiple data-recovery programs, partition managers, backup and cloning tools, and hardware diagnostics into a single Ventoy-based boot drive — plus full live OS environments (Mini Windows 10 PE and Linux). Because it boots the machine, it works on PCs that can’t reach the Windows desktop at all. It also runs entirely offline with no account of any kind.
For a hobbyist tech who already knows which tool to open and how to read its output, MediCat is one of the most complete rescue suites available. Its password-removal and offline-antivirus capabilities go further than what GRAM offers. And for personal or educational use where the licensing situation doesn’t apply, the price is unbeatable: free.
Two things: guided diagnosis and licensing clarity. MediCat gives you the tools and assumes expertise; GRAM’s AI agent reads the actual diagnostics from the machine in front of you — SMART data, event logs, boot config, crash dumps — and tells you what’s wrong and what to run, in plain language, on the broken PC itself. No stepping away to a second computer to search a stop code. GRAM’s local tools (diagnostics, security sweep, network diagnostics, file recovery, drive imaging) are free and offline; you only pay when you use the AI.
For shops, MSPs, and anyone doing paid repair work, GRAM’s licensing is straightforward: the toolkit is free, the AI is paid per session or by seat plan, and everything is properly licensed. MediCat’s own documentation explicitly warns against commercial use and acknowledges that some included tools may not be properly licensed — a real concern if you’re billing customers.
They cover different failure states and don’t conflict. Boot MediCat when the machine won’t start or you need an offline antivirus scan or password reset. Run GRAM inside Windows when the machine boots and you want AI-guided diagnosis or a documented repair trail for the customer. A Ventoy drive holding the MediCat files still works as normal USB storage, so the GRAM folder rides along on the same stick. On a personal bench where licensing isn’t a concern, carrying both makes sense; for commercial work, lean on GRAM and keep a properly licensed bootable suite (like Hiren’s BootCD PE, which bundles only free and legal software) for won’t-boot jobs.
Yes, MediCat is free to download from medicatusb.com. However, its own licensing page warns that some bundled tools “may not be properly licensed for any use” and “may be modified versions of commercial software,” and the project explicitly states it is not intended for commercial use. For personal and educational use it costs nothing.
MediCat’s own documentation says no — it is “NOT intended for commercial use” and the team “does not recommend or endorse using this tool in a commercial setting.” If you run a repair shop or MSP, GRAM’s licensing is built for that: the toolkit is free, and the AI is paid with clear per-session or seat-plan billing.
MediCat bundles password-recovery and system-level tools that trigger false positives in Windows Security and other antivirus software. The official setup instructions tell you to temporarily disable real-time protection before running the installer. GRAM does not require disabling antivirus — it runs as a standard portable application.
MediCat, because it boots the machine into its own WinPE or Linux environment. GRAM runs inside the live Windows session, so the machine must reach the desktop first. For won’t-boot situations, use MediCat (or another bootable suite) to get the machine running, then GRAM to diagnose the root cause so it doesn’t happen again.
If AI-guided diagnosis or clear commercial licensing matters at your bench, download GRAM free — the toolkit costs nothing, and the AI is there when you want it.
Related: The best PC-repair USB toolkits (2026) · GRAM vs Hiren’s BootCD PE