# OneLine: Learn Korean Daily — Writing, grammar & AI coaching

> Writing, grammar & AI coaching (iPhone/iPad app by Frata Ltd.)

- Source: https://appshunter.io/ios/app/oneline-learn-korean-daily/id6795264714 (this page in markdown: same URL + `.md`)
- Developer: [Frata Ltd](https://appshunter.io/developer/777328026)
- Category: Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.4 · 135 MB
- Languages: American English
- Released: 2026-08-26
- Data updated: 2026-10-25

## What is OneLine?

Put your Korean into practice.

Learn Korean grammar and vocabulary, then use them in your own writing and in text conversations. When you write, an AI coach shows you how a Korean speaker would say it and explains the change in plain English.

WRITE ABOUT YOUR LIFE
Start from a daily prompt matched to your level, from your first sentences to B2, with the words, grammar and example answers for it one tap away.

A COACH THAT EXPLAINS EVERY FIX
Submit your answer and the coach shows the natural way to say it. It points out what a Korean speaker would notice, like a particle, the word order or a stiff phrase, and explains why in plain English. If your answer is already natural, it says so.

HEAR IT READ BACK
Play any corrected sentence in a native Korean voice and hear how your own words should sound.

KOREAN GRAMMAR YOU CAN USE THE SAME DAY
Grammar lessons from A1 to B2 with plain explanations and real examples. Learn a pattern, then use it in your own writing.

VOCABULARY FROM YOUR OWN PROMPTS
Save words and grammar as you meet them. Study brings them back on a schedule (spaced repetition) until they stick.

KEEP THE CONVERSATION GOING
Practise short text conversations in Korean with Buddy, your AI coach, and get feedback during and after the chat.

A STREAK THAT'S HONESTLY COUNTED
Your calendar shows every day you practised, your current run and your best. Missed a day? Answer it late and keep your run going.

FREE, WITH NO LIMITS
Everything in OneLine is free, with no daily limit. Writing, saving your answers, grammar lessons, vocabulary, Study and your streak have no ads. AI corrections, chats with Buddy and "Write your own" practice are free too, after a short video ad.

ONELINE PRO
Pro removes the ads and lets you choose which topics your daily prompts come from. Monthly or annual. Prices and any eligible offers are shown in the app. Subscriptions renew automatically unless cancelled in your App Store settings.

Questions? support@one-line.app
Terms: https://one-line.app/terms
Privacy: https://one-line.app/privacy

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| OneLine pro annual | $6.99 | per year |
| OneLine: Daily Sentence | $0.99 | per month |


## Is OneLine safe?

Not enough ratings yet to assess OneLine.

## Is OneLine legit?

OneLine: Learn Korean Daily has limited verification signals. The AppsHunter Legitimacy Score for OneLine is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.15.0 — 2026-10-18

Study is here. The words and grammar you save come back on a schedule until they stick, and the Home screen shows what's due today.

Also: a calmer Home with a week-first calendar, lessons that start with listening, and smaller fixes throughout.

### 1.13.0 — 2026-09-15

More ways to put your Korean into practice.

• Chat with Buddy, your AI coach, and get feedback during and after your text conversations.
• Choose writing or conversation for your daily practice, including catch-up days.
• Explore vocabulary, grammar and examples from a redesigned lesson hub before you practise.

### 1.10.0 — 2026-09-07

New lesson flow: a hub of tappable sections replaces the old step carousel, so you can jump straight to what you want to practice.

Your daily line now opens through a short guided lesson — vocabulary and patterns first, then the sentence.

Corrections now surface one clear takeaway tied to the grammar pattern you're learning.

Practice aids (the composer helper and "Turn it around") are now free for everyone — only deeper coaching is Pro.

Example answers now have audio with more voice variety.

Smaller fixes: catch-up days stay visible on your calendar after you write, and the "done" screen offers more ways to keep going (words, patterns, or another level).

### 1.9.0 — 2026-08-30

A guided daily lesson. Your prompt now opens with a short warm-up: pick the words you want to keep, read a few example answers, then write your line. Kept words wait for you under the writing area, and your progress is saved at every step. Close anytime, pick up where you left off.

A writing page that feels like paper. The composer is now a lined notebook page with your own handwriting style, plus quick Examples, Patterns, and Words buttons when you need inspiration.

Also: your day's recap on the home screen (words kept, examples read), bigger listen and translate buttons, a replay option for rewriting today's line, and lots of small polish.

### 1.8.0 — 2026-08-27

What's New in v1.8.0

- Practice got smarter. Coach's pick highlights the most useful word to practice next, with adaptive input that matches the word. Your answer stays visible after you check it, and a red squiggle shows exactly where you went wrong.

- Better feedback on corrections. The word-level diff now highlights changed spans more accurately, and correct pattern usage is no longer flagged for unrelated slips.

- Smoother experience. The submit button now shows "Analyzing..." with a spinner while your sentence is being reviewed. Fixed a layout gap on the write screen, badge flickering on the Patterns tab, and grammar form labels now appear on every practice item.

- New celebration flow. The post-correction celebration has been redesigned.

- Promo codes. You can now redeem promo codes on both iOS and Android.

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## More apps by Frata Ltd

- [Chiado](https://appshunter.io/ios/app/chiado/id6803688127)

All apps by Frata Ltd: https://appshunter.io/developer/777328026

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-25.*