LookUpList is an iPhone app developed by Yohei Noguchi that allows users to create their own dictionary and word lists. With just a few taps, users can look up words and phrases in their favorite websites directly. The app cross-searches all the websites added to the tab bar, making it easy to compare search results.

One of the standout features of LookUpList is its ability to add looked-up words to word lists with just one tap. This feature is particularly useful for language learners who want to keep track of new vocabulary. Additionally, LookUpList allows users to look up words in other apps without the need to switch between applications, making it convenient for reading articles or other content.

Another great aspect of LookUpList is the flexibility it offers in terms of adding websites. Users can add not only online dictionaries but any websites that have search functionality. This allows users to create their own personalized dictionary and word lists.

The app also includes built-in dictionaries on iOS, providing users with even more options for looking up words. The interface is user-friendly, with a simple design that allows for easy navigation. Users can switch between websites by swiping, making it convenient to use with one hand.

In terms of organization, LookUpList allows users to create multiple word lists and sort words alphabetically or by date created. Each word in the word list has a check button, a favorite button, and a note, providing users with the ability to customize their lists.

Overall, LookUpList is a convenient app for language learners and anyone looking to create their own dictionary and word lists. Its seamless integration with other apps and the ability to add any website with search functionality make it a versatile tool. With its user-friendly interface and useful features, LookUpList is a valuable addition to any language learner's toolkit.