Learn Czech on LingQ

LingQ is a language learning app that uses the same logic for learning a new language as learning your native tongue: using content you already like. They have books, news, podcasts, sports coverage, politics, culture, and food to name a few.
Price: Free
Devices: Android, iPad, iPhone, and Web

Learn Czech on LuvLingua

LuvLingua is a language learning app that uses an interface that is more geared towards a younger audience. It's focused on vocabulary learning and listening skills. The basic app is free but the more advanced ones are paid.
Price: Free
Devices: Android, iPad, iPhone, and Web

Learn Czech on Ling

Ling's app has features that make learning fun and easy. Whether you're a beginner or an experienced speaker, Ling has something for everyone. You learn at your own pace with tons of lessons, vocabulary lists, and quizzes. You can even practice your conversation skills with their chatbot.
Price: Free
Devices: Android, iPad, iPhone, and Web

Learn Czech on Mango Languages

Mango Languages uses algorithms to offer a personalized language learning experience. Language learners can speak and hear the language they are learning, participate in daily quizzes to reinforce their progress, and even engage in live conversations with native speakers around the world. Language instructors also use Mango Languages to create customizable lessons tailored to each student's current skill level.
Price: $6.67/month
Devices:

Learn Czech on Clozemaster

Summary: Clozemaster is a Web & iOS app that helps language learners practice and learn new words using fill-in-the-blank sentences. It's another gamified app like Duolingo.
Price: Free
Devices: Android, iPad, iPhone, and Web

Learn Czech on Tandem

Tandem is a free platform with a simple premise: there is probably someone out there who is learning your native language, and whose native language you want to learn. So they put you in touch with them. When you sign up, Tandem will review your application to make sure their platform remains safe and that the person you get matched with is also a keen language learner.
Price: depends
Devices: Android, iPad, iPhone, and Web

Learn Czech on Qlango

Qlango is a language learning app that promises to help you learn a new language in 5-minute increments, as each lesson lasts that long. It offers quick and easy lessons, along with interactive games, flashcards, and chatbots to help you learn vocabulary and grammar.
Price: Free
Devices: Android, and iPhone