title: What is Personal Prime
description: HackMD Prime is the first-class, value-added flavor of HackMD.
# What is Personal Prime
[Try HackMD Prime Personal, first month is on us](https://hackmd.io/@hackmd-marketing/Prime_Personal_english)
You are already familiar with the "prime" symbol ($'$) as in $A'$, because it's everywhere in algorithm and mathematics, on which are the bricks the core technologies of HackMD builds.
<span class="hmd-primer-logo"></span> **HackMD Prime** is the first-class, value-added flavor of HackMD.
## I don't have an account :point_right:
Click [here](https://hackmd.io/join) to register for free, start your HackMD.
## I've already had an account :point_right:
- Overview: You can find the magic wand "Upgrade to HackMD Prime " on the left.
- You can view all plans in "Billing" page.
# How to check invoices or change plan
- You can also adjust all plans in "Billing" page.