Ventoy is a free, open-source multiboot USB loader: install it on a drive, drop ISO files onto it, and pick which one to boot from a menu. It doesn't contain repair tools itself — it carries them. GRAM (Guardian Repair & Analysis Module) is a free portable Windows repair and diagnostics toolkit that runs inside the live Windows session from the USB, with a built-in AI repair agent powered by Claude. Ventoy boots the machine into other environments; GRAM runs inside the running Windows and diagnoses what's wrong with it.
Both are legitimate, widely used, and free. This table is about fit — they solve different problems. Ventoy details sourced from ventoy.net and the project's GitHub as of mid-2026.
| GRAM | Ventoy | |
|---|---|---|
| What it is | Free USB repair & diagnostics toolkit with a built-in AI repair agent (Claude) | Free, open-source multiboot USB loader — carries and boots ISO/WIM/IMG/VHD(x)/EFI files from one drive (v1.1.16 as of June 2026) |
| Price | Toolkit free forever; AI is pay-as-you-go — credit packs from $25 (10 sessions) or seat plans from $49/mo | Completely free and open-source (GPLv3+) |
| Core strength | Guided diagnosis — the AI agent reads the live machine and walks the fix step by step | Multi-ISO booting — drop any number of ISOs on the drive and select at boot; 1,300+ ISOs tested |
| What it runs | Portable — runs inside the live Windows 10/11 session from the USB (runtime bundled, nothing to install) | Boot loader — boots the machine into whichever ISO you select (WinPE, Linux, installers, rescue suites) |
| Repair tools | Yes — system diagnostics, security sweep, network diagnostics, file recovery, drive imaging, plus AI agent | None built in — Ventoy carries other tools' ISOs but doesn't include repair utilities itself |
| AI / guidance | Yes — conversational AI assistant reads diagnostics and explains the fix | None |
| Boot support | Not a boot disk — the machine must reach the Windows desktop | Legacy BIOS + UEFI + Secure Boot; MBR and GPT |
| Ideal user | Techs and consumers who want AI-guided diagnosis on machines that still boot | Anyone who carries multiple bootable images and wants one drive instead of many |
| Notable limits | Can't help until the machine reaches the desktop; AI features need internet and paid credits | Not a toolkit — no diagnostics, no repair scripts, no AI; some pre-compiled binaries in the source have drawn auditability concerns |
Multi-ISO management, full stop. Without Ventoy (or a similar multiboot loader), carrying MediCat, Hiren's BootCD PE, Sergei Strelec's WinPE, a Windows installer, and a couple of Linux distros means a separate USB stick for each — or reformatting one stick every time you need a different image. Ventoy solves that: install it once, copy ISOs onto the drive like regular files, and pick at boot. No reformatting, no special imaging, no limit on how many ISOs you carry. It supports Legacy BIOS, UEFI, and Secure Boot out of the box, works with .iso, .wim, .img, .vhd(x), and .efi files, and has been tested with over 1,300 ISO images. And a Ventoy drive still works as normal USB storage for non-ISO files alongside the images.
Ventoy is also completely free and open-source — no account, no credits, no paid tier. For pure multi-ISO booting it's the standard.
Ventoy carries tools; GRAM is a tool. Ventoy can boot you into a WinPE rescue environment, but once you're there you still need to know which utility to open, what command to type, and how to interpret the output. GRAM runs inside the live Windows session and puts an AI repair agent at the bench: describe the symptom or paste a stop code, and the agent reads the actual disk health, event logs, boot config, and crash dumps from the machine in front of you, explains the likely cause, and walks the exact commands. No second PC needed to search an error.
GRAM's local tools — system diagnostics, security sweep, network diagnostics, file recovery, drive imaging — are free and work offline. You only pay when you use the AI. And because GRAM runs inside the running Windows session, it sees things a boot environment can't: live processes, services, startup items, Windows Update state, and network configuration.
GRAM and Ventoy aren't competing for the same job — they're two layers of the same USB stick. The most common bench setup is a Ventoy drive carrying bootable ISOs (MediCat, Hiren's PE, Strelec, a Windows installer) for machines that won't start, with the GRAM folder copied onto the same drive for inside-Windows work on machines that do. A Ventoy drive works as normal USB storage, so both coexist on one stick with no conflict. Boot Ventoy when the machine can't reach the desktop; launch GRAM from the drive when it can.
Yes — that's the recommended setup. A Ventoy drive still functions as normal USB storage, so you copy the GRAM folder onto the same drive alongside your ISOs. Boot from Ventoy when the machine won't start; plug in and launch GRAM inside Windows when it does. One drive, both tools, no conflict.
No. Ventoy is a multiboot loader — it carries and boots ISO files (rescue suites, installers, Linux distros) but includes no repair tools of its own. You still need the actual toolkit ISOs on the drive. GRAM is a repair toolkit: it includes diagnostics, security sweep, file recovery, drive imaging, and an AI repair agent.
Ventoy works entirely offline — it's a boot loader with no online component. GRAM's local repair tools are also fully offline. Only GRAM's AI assistant needs an internet connection on the machine being serviced, because it relays to Claude. Without connectivity, GRAM still works as a free repair toolkit.
Yes. Ventoy is free and open-source under GPLv3+. There is no paid tier. GRAM's toolkit is also free forever; you only pay for AI features via credit packs or seat plans.
If you want AI-guided diagnosis alongside your Ventoy multiboot stick, download GRAM free — copy it onto the same drive and launch it inside Windows. The toolkit costs nothing, and the AI is there when you want it.
Related: Best PC-repair USB toolkits (2026) · Portable vs bootable repair USB toolkits