Type the word that comes to mind for each image. We measure your fluency by how fast you switch between languages.
Sign in to track your score history over time.
Measure your fluency in three simple steps
Pick any of the four supported languages other than your own
Look at an image or number and type its name in the requested language
We analyze your switching speed and report a fluency level
The core of the result page — score, four transition averages, and a parent-friendly one-liner on one screen. (numbers below are illustrative)
Language tested
Fluid Bilingual
Switches fluently and quickly in most situations.
Avg response
0.94s
Switch cost
+0.34s
Accuracy
92%
Four transitions (ms)
💡 Solid everyday-conversation response speed — above average for your peers.
* Example only — actual results vary by learner.
A few light modes to get your brain into language-switching mode
Get an objective read on how much of the language you study has actually stuck.
Track your child's progress as a number — see real growth, not just hours studied.
Log response-time trends across many learners and share clean reports with families.
See how naturally your brain switches between the two languages you live in.
The mental load of switching between two languages is called the Language Switching Cost. The more fluent you are, the lower that cost gets.
Just by looking at images and typing the words, we can measure how quickly your brain moves between two languages.
Read the science of language switching cost →No. You can measure and view results anonymously. Sign in if you want your history saved.
About 5 minutes for the 30-item test.
Any pair from Korean, English, Japanese, and Chinese — your UI language acts as your native, the other is your target.
Check your foreign-language fluency right now