
Word nerds with a love for linguistic curiosities and novel nomenclature that’s more fulsome than their ability to make interesting new terms stick will be thrilled by Yak Tack: A neat little aide–mémoire (in Android and iOS app form) designed for expanding (English) vocabulary, either as a native speaker or language learner.
Yak Tack uses adaptive spaced repetition to help users remember new words — drawing on a system devised in the 1970s by German scientist Sebastian Leitner.
The app’s core mechanic is a process it calls ‘tacking’. Here’s how it works: A user comes across a new word and inputs it into Yak Tack to look up what it means (definition content for words and concepts is sourced from Oxford, Merriam-Webster, and Wikpedia via their API, per the developer).
Now they can choose to ‘tack’ the word to help them remember it.
This means the app will instigate its system of space repetition to combat the routine problem of memory decay/forgetting, as new information tends to be jettisoned by our brains unless we make a dedicated effort to remember it (and/or events conspire to make it memorable for other, not necessarily very pleasant reasons).
Tacked words are shown to Yak Tack users via push notification at spaced intervals (after 1 day, 2,3,5,8, and 13; following the fibonacci sequence).
Tapping on the notification takes the user to their in-app Tack Board where they get to re-read the definition. It also displays all the words they’ve tacked and their progress in the learning sequence for each one.
After the second repeat of a word there’s a gamified twist as the user must select the correct definition or synonym — depending on how far along in the learning sequence they are — from a multiple-choice list.
Picking the right answer means the learning proceeds to the next fibonacci interval. An incorrect answer moves the user back to the previous interval — meaning they must repeat that step, retightening (instead of expanding) the information-exposure period; hence adaptive space repetition.
It’s a simple and neat use of digital prompts to help make new words stick.