Frequently Asked Questions

inappropriate GIF

Unfortunately, we cannot gurantee the quality for all GIFs given that they're served by an external provider. Please email us at and we can review your case.

how the vocabulary size is estimated?

The most accurate way to count someone's vocabulary would be to go through all words in the dictionary and count how many you knew. Instead, we check every N word in 2 steps which allows us to define it with about 15% margin of error. There are lots of factors that go into measuring someone's vocabulary size — for example, do you count "simple" and "simply" as two words or just one? We take a conservative approach and count the number of headwords (not derived words) which you are estimated to know in a standard dictionary.

an explore list is missing some words

There is a chance that some list of words from our Explore section may seem incomplete. Currently, these lists contain words available in a classic dictionary and thus, if a word isn't present there, it won't be in the list. Later, we will be extending this.

android, web, and other platforms?

Currently, Climb is available only for iOS. Please submit this form for other platforms.

change language

Currently, Climb supports only English learning. More languages will be added very soon, please submit this form to help us prioritize

export lists

To export any of your lists, simple tap "Edit" and copy all words.

sharing from iBooks

Unfortunately, sharing from iBooks only works normally with extensions that were provided by Apple. It seems like it has been broken since 2015. 😔
We're thinking of other options to make sharing from iBooks possible.

something doesn't work

We're sorry about that. Please email us at and we'll do our best to resolve your issue.

other inquiries

Please reach out us at

Subscribe for Updates

Climb is available for iOS users.
We can email you once we launch on other platforms.