Overview of Duolingo Courses

For English Speakers:

36 courses and 56 trees
Language
Trees
Arabic
46 skills
Chinese
88 skills
Czech
84 skills
Danish
70 skills
Dutch
123 skills
Esperanto
44 skills 62 skills 65 skills 69 skills
Finnish
35 skills
French
78 skills 96 skills 142 skills 158 skills 172 skills 174 skills 199 skills
German
121 skills 133 skills
Greek
74 skills 95 skills
Hawaiian
30 skills 38 skills
Hebrew
84 skills
High Valyrian
38 skills
Hindi
32 skills
Hungarian
78 skills
Indonesian
69 skills
Irish
64 skills
Italian
66 skills
Japanese
40 skills 92 skills 131 skills
Klingon
62 skills (v.1) 62 skills (v.2)
Korean
65 skills
Latin
22 skills
Navajo
11 skills
Norwegian
117 skills 172 skills
Polish
67 skills
Portuguese
91 skills
Romanian
62 skills
Russian
79 skills
Scottish Gaelic
34 skills 107 skills
Spanish
61 skills 113 skills 159 skills 178 skills
Swahili
65 skills
Swedish
66 skills
Turkish
67 skills
Ukrainian
51 skills
Vietnamese
84 skills
Welsh
118 skills

For German Speakers:

3 courses and 3 trees
Language
Trees
English
55 skills
French
129 skills
Spanish
64 skills

For Portuguese Speakers:

4 courses and 4 trees
Language
Trees
French
70 skills
German
72 skills
Italian
68 skills
Spanish
64 skills

For Russian Speakers:

4 courses and 8 trees
Language
Trees
English
55 skills 88 skills 103 skills 121 skills
French
78 skills
German
72 skills 111 skills
Spanish
64 skills

For Spanish Speakers:

5 courses and 6 trees
Language
Trees
English
151 skills 154 skills
French
68 skills
German
72 skills
Italian
66 skills
Portuguese
69 skills

The Lastest Updates:

Note: I no longer maintain these lists, sorry.