Rolko
Web app + browser extension · Chinese, Japanese, Korean, and English

Learn languages from content you already enjoy

Watch, read, and discover new words. Free includes lookup, reading, and limited translation. Previously saved words remain reviewable on Free; Starter adds saving new words.

Start learning

No credit card. Continue with Google or email. See plans and pricing.

Interactive subtitle demo

Learn with YouTube or Netflix

YouTubeGB
学中文说汉语听读
后来我发现,这座城市比想象中更温柔。★
0:00 / 0:15
↑Extension overlay — tap or hover a word to explore

Hover a subtitle to see its meaning and pronunciation. Save new words and review them later.

The web app works on mobile. The browser extension is for desktop.

Bring real content into the web app

Paste text or import a supported transcript. Explore words, mark them as learned or learning, and review them later.

Product example shown below: Chinese → English transcript study.

Reading workspace

学中文的秘诀

Tap or hover a word for its pronunciation and meaning. Mark it as learned or learning.

Word Coverage

Learned: 50%Learning: 20%New: 30%
主持人
你学中文多久了?
嘉宾
大概三年了,但是每天都要练习。
主持人
有什么好的学习方法吗?
嘉宾
我觉得看中文剧最有用,边看边学。

Review with SRS

Spaced-repetition surfaces the right words at the right time. Short daily sessions that actually stick.

Review with spaced repetition

Vocab Review

加油
今天的比赛很重要,大家一起加油吧!

Your vocabulary, at a glance

Every word you save lands here. Filter by status, search instantly, and see pronunciation, meaning, and example sentences.

12 words
每天
měitiān
every day; dailyStatuslearnedNext reviewIn 4 months
努力
nǔlì
to work hard; diligentStatuslearningNext reviewIn 3 months
进步進步
jìnbù
progress; to make progressStatuslearnedNext reviewIn 3 months
有趣
yǒuqù
interesting; fascinatingStatuslearningNext reviewIn 2 months
语言語言
yǔyán
languageStatuslearningNext reviewIn 2 months
城市
chéngshì
city; townStatuslearnedNext reviewIn 2 months
明白
míngbai
to understand; clearStatuslearningNext reviewIn 2 months
工作
gōngzuò
work; job; to workStatuslearnedNext reviewIn 1 month
非常
fēicháng
very; extremelyStatuslearnedNext reviewIn 1 month
喜欢喜歡
xǐ huan
to like; to be fond ofStatuslearningNext reviewIn 4 weeks
朋友
péngyou
friendStatuslearnedNext reviewIn 3 weeks
学习學習
xuéxí
to study; to learnStatuslearnedNext reviewIn 3 weeks

Keep track of your progress

See exactly how many words you know, your review streak, daily activity, and where each word sits on the mastery scale.

rolko.xyz/app/stats
Saved vocab
10,200
7,500 learned
2,700 learning
Learned
7,500
+12 today
+48 this week
Learning
2,700
−2 back to learning today
−8 back this week
Review queue
142
Recommended today: 100
~2 days at 100/day
Streak
47 days
Best 61
78 active days
Vocabulary progress
7,500 learned · 2,700 learning · 10,200 total
Learned 73.5%Learning 26.5%
Movement
today
+12 learned
-2 back to learning
this week
+48 learned
-8 back to learning
This month
+120 learned
-18 back to learning
This year
+7500 learned
+10,200 saved
Words moved to learned (last 90 days)
Review activity
Daily reviews · Accuracy trend
Daily reviews
1,227 vocab · 404 tone
30 days
Jun 1
58 total
Jun 2
69 total
Jun 3
44 total
Jun 4
78 total
Accuracy trend
Right-answer % per day, 30 days · rest days skipped
92% avg
Avg
92%
High
93%
Low
91%
Due now
Words due for review right now.
定位
positioning / orientation / locate
惨遭
suffer / fall victim to / be subjected to
昏暗
dim / dark / gloomy
Weak
Still learning — review interval under 7 days.
具尸
corpse / dead body / Corpse
Jun 9
跑腿
run errands / errand runner / delivery person
Jun 7
副总
Vice president / Deputy General Manager
Jun 12
Mastered
Graduated to learned status.
女主
heroine / female protagonist / female lead
跑出
run out / escape / break out
花店
flower shop / florist / flower store
Tone practice
Master tones from the most-common characters up
94% accuracy
✓
Top 100
500
Top 500
1k
Top 1k
2k
Top 2k
3k
Top 3k
4k
Top 4k
5k
Top 5k
Top 500current tier
312 / 500 mastered
62% completeNext: Top 1000
Reviews
8,780
8,240 right
Accuracy
94%
540 wrong
Due today
18
5 new
Active
188
in rotation

Make real progress

Learn from real content while watching and browsing

Watch, read, and discover new words. Keep what you learn with spaced-repetition review.

The web app and desktop extension support page-text learning in Chinese, Japanese, Korean, and English. Video-subtitle support is available for Chinese, Japanese, Korean, and English.

No credit card required.

✓Multi-language web app: Chinese, Japanese, Korean, and English✓Browser extension: Chinese, Japanese, Korean, and English✓Current video subtitle demo: Chinese, Japanese, Korean, and English✓Meanings + available pronunciation details✓Spaced-repetition reviews✓Cancel paid plans anytime