# UnderLine - Live Typing Chat — Ad-Free Messaging with Friends

> Ad-Free Messaging with Friends (iPhone/iPad app by 5mm.)

- Source: https://appshunter.io/ios/app/underline-live-typing-chat/id6751827790 (this page in markdown: same URL + `.md`)
- Developer: [5mm](https://appshunter.io/developer/1832720335)
- Category: Social Networking, Productivity
- Price: Free
- Age rating: 17+
- Requires: iOS 15.6 · 67 MB
- Languages: Japanese
- Released: 2025-10-02
- Data updated: 2026-10-25

## What is UnderLine?

UnderLine is a one-to-one messaging app that lets your conversation partner see your words in real time while you type.

Unlike conventional messaging apps, where the other person sees your words only after you tap Send, UnderLine lets the conversation begin from the moment you start typing. When you delete draft text, the change is also reflected on the other person's screen. This makes it possible to share the rhythm of a conversation and the way words take shape, even when you are apart.

Key features

- Real-time display of text while it is being typed
- Simple one-to-one messaging
- Add friends using public IDs or QR codes
- See in your conversation list when someone is typing
- Search your contacts, and your conversation list by name or message
- Mute notifications, pin conversations, or hide them from your list
- Push notifications for new messages
- Blocking, reporting, and in-app account deletion
- Encrypted device-to-device transfer using a QR code
- Encrypted iCloud backup and restoration

Message bodies and live-typing text are end-to-end encrypted. Push notifications never include message content.

Important notes

- Live typing is visible while the other person has the same conversation open. Because text may be seen before you tap Send, do not type anything you do not want the other person to see.
- Enable notifications to receive new-message alerts while the app is in the background or closed. Message content is not shown in notifications.

## Is UnderLine safe?

Not enough ratings yet to assess UnderLine.

## Is UnderLine legit?

UnderLine - Live Typing Chat appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for UnderLine is 73 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 2.2 — 2026-10-24

• Send photos that disappear 20 minutes after sending. Tap the photo button next to the message field to take or choose a photo. The other person sees a round photo above the conversation; tap it to view it full screen. A ring shows the time left
• Received photos can be saved to your device or hidden. A photo you sent can be retracted at any time, which removes it from the other person's screen and deletes its encrypted data from our servers
• Sign up and sign in with an Apple or Google account. You can also add one under Profile > Sign-in methods. Your email and password keep working. Once linked, an account cannot be unlinked in the app
• Swipe one of your sent messages to the left to choose, after sending, which message it replies to. The original text is shown above your reply; tap it to jump to the original message (when the other person also has 2.2.0 or later)
• Swipe right in a conversation to go back to the list
• The conversation list now ends with a button to share the app with friends
• Added a button that jumps to the latest message in a conversation, and an unread count on the back button. Times of newly received messages now use the same server time as the conversation list

### 2.1.3 — 2026-10-21

• Added a list button to the left of the message field that opens the history of text you cut. When you type, it turns into an "×" that cuts your text and keeps it on this device for 30 minutes. Choose a text from the history to put it back
• When you put a cut text back, it also fades in from its start on the other person's screen (if they also have 2.1.3 or later)
• A sent message can now be unsent only within 5 hours of sending it
• You can turn off the button to the left of the message field in Settings (「切り取りボタン（×）を表示」)
• The keyboard now closes only when you tap the conversation

### 2.1.2 — 2026-10-20

• You can now unsend a message you sent (press and hold the message, then choose 「送信を取り消す」). If the other person also has 2.1.2 or later, the text is hidden on their screen too
• Added an "×" button to the message field that clears everything you typed. You can turn it on or off in Settings
• Fixed an issue where tapping near the Send button could open the Paste menu
• When the other person types more than three lines, you now see the last lines
• Fixed an issue where the live-typing row could occasionally stop updating
• Fixed an issue where, after many messages, a device could not start a conversation with someone it had not talked to before
• When account deletion cannot continue (for example, because you signed in a while ago), the app now tells you what to do
• Fixed an issue where text typed right after sending a message could disappear
• The invitation you share now links to the App Store page

### 2.1 — 2026-10-17

UnderLine 2.1 makes live-typing conversations safer and smoother.

• New end-to-end encryption for messages and live typing
• A steadier live-typing row and message field, and better layout at large text sizes
• Search your contacts, and your conversation list by name or message; mute, pin, or hide individual chats
• Reports can now include optional details and images
• Added an open-source licenses screen in Settings
• Fixed issues affecting notifications, sign-in, adding friends, and unblocking

Please note
Chat history from earlier versions can be viewed only for messages this device has already displayed (not on a new device). Chat-history backup/restore and device-to-device transfer are not provided.

### 2.0 — 2026-09-02

より安心して快適に会話を楽しめるよう、セキュリティ、操作性、安定性を大幅に改善しました。

- メッセージと入力途中の文章をエンドツーエンド暗号化
- QRコードを使った暗号化端末移行に対応
- iCloud暗号化バックアップと復元に対応
- れんらく先、トーク一覧、トークルーム内の検索を追加
- メッセージのブックマークを追加
- トークごとの通知設定、ピン留め、非表示を追加
- 通報への任意の説明文と画像添付に対応
- 通知のプライバシー保護、ログイン、友だち追加を改善
- 画面遷移、スクロール、操作感を改善
- その他、安定性と軽微な不具合を改善

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All apps by 5mm: https://appshunter.io/developer/1832720335

## Related topics

[live typing](https://appshunter.io/ios/topics/live-typing)

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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.*