The best alternatives to BuildMyPC are Jawa, PC Builder, and MJOLNIR. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Jawa is the first marketplace for gamers to buy and sell parts. Jawa launched a few days ago with verified sellers, protections for everyone, a no scalping policy and an extensive database of parts and is led by Amanda Fried and a strong community of gamers.
PC Builder is a website which helps people build a list of compatible PC parts without getting into any compatibility issues. The website is created by keeping beginners in mind, and the main goal of this website is to make compatibility easy for everyone.
A compact high-end mini-ITX case that supports full-sized PC hardware — such as NVIDIA GeForce RTX 2080Ti and Intel Core i9 9900K — leaving you with freedom to create anything from an epic gaming rig to a powerful workstation.
Dune Pro is a PC case that gives you limitless ways to personalize for your needs. It's engineered for a range of industry standard parts. It was designed to give you the flexibility and freedom to customize configurations.
Pcbuilderpro.com is a free website that helps you build your own custom PC by picking up different parts. When building a PC, it is very important to know what types of components and hardware you should use.