Bliu Bliu continually customizes the lessons based on your progression with the language.
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Pros
Pro Gives you real-world practice
Rather than simply expecting you to remember vocabulary, Bliu Bliu gives you practice reading real content in your target language.
Pro Unique way of adjusting lessons to your level
You can tell Bliu Bliu which words you are comfortable with and which you aren't by rating them as "easy" or "hard".
The site keeps track of these and gives you pieces of writing that use a good ratio of words you know and words you don't.
The more familiar you get with the language, the more difficult the reading becomes.
Cons
Con Not all translations are accurate
Each word is translated individually by google, which only displays one definition. If a word has more than one use, it may show you the definition of the incorrect word.
Con No way to interact in case of questions
If you happen to have a question, you are out of luck. The only resource for you is to resort to Google.
Con Not a great starting place for complete beginners
The site will test your knowledge of your target language after signing up. If it finds you are just starting out, it will suggest you come back after you know a bit more vocabulary.
Bliu Bliu throws you right in by giving you things to read in your target language, rather than giving you structured lessons.