The Three Types Of APIs

The “Application Programming Interface,” or API in short, is a crucial element in today’s technology-driven world. Today we’ll show you the three types of APIs and explain the differences between them.

If you have no clue what an API is, make sure to check out our previous articles here and here. You don’t want to miss these articles there before you continue reading here 😉 

Internal / Private APIs

“Internal APIs,” also known as “Private APIs,” are disclosed by internal systems only. Those types of APIs are used in companies for their internal systems. They are “hidden” from external users since they are not listed in public APU directories and are not accessible from the outside world.

Only authorized personnel can access an API developer portal to change, remove, or add new internal APIs. They help increase efficiency in various areas such as product development, logistics, HR, and customer service.

Partner APIs

“Partner APIs” can be described as something “in-between Private and Public” APIs. Although they are listed in public API directories and therefore “publicly available,” it’s only to a limited extent. Also, you’ll need special authorization as a requirement to gain full access most of the time. Once you’ve obtained access, you can communicate across company boundaries with other approved external systems. As a result, they are beneficial when working with strategic business partners. And to guarantee safety, Partner APIs have much higher security measures than Internal APIs. Those APIs are either free to use when working with ongoing business partners/partner companies or are sold as pay-by-use models. 

External APIs / Public APIs

“External APIs,” also known as Public APIs, are open-source APIs that are publicly available to every software developer. Similar to Partner APIs, they are listed in public API directories but, in contrast, don’t require special access. Public APIs can be freely exchanged, grant universal access, and give developers more flexibility than proprietary software and web services. Also, Public APIs are not restricted to a specific sector or industry, which offers clear advantages.

  • It ensures flexibility to the company’s infrastructure since it’s independent of single propriety software and technology.
  • The flexibility doesn’t end with the infrastructure of the company. Public APIs also offer more options when it comes to customization of interactions and data collection. Therefore, companies can specially tailor their service and products to their customer’s and user’s needs.
  • Sharing data primarily via APIs offers high availability and opens up new opportunities in both computing power and increases the gathered information’s value.
  • Open-Source APIs indeed are far more cost-effective for businesses and enterprises than proprietary software regarding upfront investment and ongoing costs.
  • Most developer communities, especially around open-source projects, are excellent sources for expertise, tips, suggestions of application enhancements, and mental support 😉 

Your apps, powered by iTranslate.
Localize More Projects With Less Code. 50+ Languages and Easy Integration.

iTranslate Translation API

You might also like


As a traveler, it is always important to be able to greet people in their local language. Here is a guide on how to say “Hello” in some common languages. Bon voyage!

How To Overcome Homesickness

Are you feeling homesick? You’re not alone. Millions of people feel homesick every year, but there are things you can do to help overcome it. In this post, we’ll discuss what homesickness is, the symptoms, and ways to overcome it. We’ll also share some tips for staying positive and combating loneliness while away from home.…

e.g. and i.e.

There are a few Latin terms that often create confusion for English speakers. “E.g.” and “i.e.” are two of them. This blog post will explain the difference between these two terms so that you can use them correctly in your writing.


What makes the German term “Fernweh” so distinctive? Well, it’s a word without an equivalent in English, that’s what. However, beyond that, it also has a considerably deeper connotation than one might assume at first.

8 Tips For Safe Trips With Your Dog

Traveling with your dog can be a lot of fun, but it’s important to take some safety precautions to make sure your pup is safe and happy on the road. Here are 8 tips for a safe and stress-free trip with your furry friend.