Crates.io is the registry of the Rust community used by developers for discovering, publishing and managing reusable libraries in Rust software projects. This is useful in conducting research about tools, services, and updates.
crates.io is famous as the repository for Rust crates used by developers in their software projects.
It can be mentioned that crates.io is not the website where you can use promo codes since it is a public developer registry and not a software market. Therefore, discounts are not applicable here.
Usually, crates.io is free to use for searching and downloading of Rust crates. However, to publish a crate, you will need to follow the current account rules on the official website.
To save time while working with crates, you can use existing ones instead of developing everything yourself. However, before using any package, you need to check its quality.
It can be mentioned that developers can publish crates if they will follow all rules of the registry. You need to choose a good name for your crate, create high-quality documentation, and understand the concept of crate versions.
You need to pay attention to the number of downloads, recent updates, documentation, open issues, license, dependencies, and if it is maintained. Even though you can find a popular crate, it can be not a good fit for your project.
While comparing options, crates.io is considered to be the repository of the public crates. Private package hosting solutions can be found among the private registries of Rust-compatible solutions.