Nudgy

Features

• Read a sentence in your native language and write it in English yourself. The goal is to practice building sentences quickly, and mistakes are fine.
• If you get stuck while writing, ask the AI tutor. You can ask why an expression is used, whether your sentence sounds natural, or whether there is another way to say it.
• Learn only the grammar you need for conversation, step by step, from the verb be through the present perfect. Each lesson explains why that grammar matters and which mistakes are common, then you practice with example sentences.
• Practice expressions for specific situations, such as ordering at a cafe, checking in at the airport, booking a hotel, and business meetings.
• The FSRS spaced repetition algorithm schedules your reviews automatically.
• Every sentence can be played in a native speaker's voice, and tapping a phrase shows its meaning and role in the sentence.
• Sign in with the same account to sync your progress across devices.
• Say English sentences out loud and get real-time correction. (1.0.7)
• Study common expressions and sentence patterns on their own. (1.0.9)
• See frequently asked questions and answers for each sentence. (1.0.3)
• Track your streak, sentences studied today, recent history, and a word list. (1.0.2)
• Type answers with the keyboard, switch to dark mode, and manage which sentences to review. (1.0.11)

The app is free to download. A one-time purchase gives you access to all content with no time limit, including content added later. It is not a subscription.

Release history

Versions published on the App Store. Nudgy has shipped eight updates since launching on February 28, 2026.

• App Storeapps.apple.com/kr/app/id6759553696
• Support pagetreestcorp.github.io/zero-public/support.html
• Privacy policytreestcorp.github.io/zero-public/privacy-policy.html

How it works

You write, ask questions, and review, in that order.

Learning starts with writing. You see a sentence in your native language on the screen and type it in English, and the app explains the expressions used in your sentence. We designed it so you build sentences many times, rather than trying to get the right answer on the first attempt.

If something is still unclear after reading the explanation, you can ask the AI tutor right on that screen. What you practiced comes back on a review schedule, so you don't have to decide what to review or when.