What you actually get
Format is a desktop app, not a script. It reads your machine, tells you what it found, explains each change in plain words, and keeps a journal so nothing is one-way.
A score, and what it is made of
One number out of 100, broken down per category, with the count of recommended tweaks already applied. It moves when you apply something and moves back when you revert.
Live readings from your PC
CPU with a sparkline, memory, disk and uptime, read straight from Win32. Nothing is uploaded and nothing is stored — close the app and it is gone.
Tips for this machine
Suggestions picked for your hardware, your Windows build and your edition, each with a Queue button. Blanked in the picture above, for the same reason the catalogue is.
Three tiers, and a filter to match
The segmented control at the top of the Tweaks page sets how far you are willing to go. Nothing above your chosen tier can be queued by accident.
Titles, descriptions and the tradeoff panel are blanked here. They are the product.
The default, and the whole of the Free tier. Nothing here has a cost worth arguing about: settings Windows leaves on that most people never wanted.
A measurable effect with a documented tradeoff, spelled out before you apply it. Balanced never touches Defender, Windows Update or recovery. Included with Pro.
Opt-in, clearly marked, and rare on purpose — there is exactly one today. Speed costs something else, and the detail pane says what. Included with Max.
Written down before it is written over
Every action records the prior value and its value kind before the new one lands. That is the whole trick, and it is why revert is a button rather than a promise.
Detect
Format reads the current state of every tweak and gates each one on your Windows build and edition. Anything that does not apply to your PC is marked, not hidden.
Plan
Queued tweaks become a batch. You review it in full before anything happens, and a Windows restore point is offered first — on by default.
Apply
Each action records the prior value and its value kind before writing the new one. If any action in the batch fails, the whole batch is rolled back. Nothing lands half-applied.
Revert
The journal entry carries its own copy of the action, so History can undo a session even after the tweak that made it has been rewritten or dropped in a later release.
Administrator, only at the last moment
Format starts as a normal user. Detection, the games library, the dashboard and History all work that way, so you can look at everything it proposes before granting anything.
When you apply or revert, it saves the batch, restarts itself with a UAC prompt, and the elevated copy picks the batch back up. That is also why the installer needs no admin rights and installs per user.
What it changes
Defender, Windows Update and recovery are off limits at every tier.