Comparison

UnderLine vs loveU(ラブユー)

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

UnderLine

Features
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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 - Photos that disappear 24 hours after they are sent - Reply to a message and react with emoji - Share text, links and photos into UnderLine from other apps - 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 - Available in Japanese, English, Spanish, Portuguese, Korean, French, German, Indonesian and Traditional Chinese 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. - Your chat history is stored only on your device. Backup and restore, and moving your history to another device, are not provided. - A photo disappears from the other person's screen 24 hours after it is sent. A photo they saved to their device is not removed.

About

loveU(ラブユー)

This app allows couples to send handwritten digital letters to each other daily. Save your feelings and memories with drawings and short messages, viewable on timelines and widgets. Premium features unlock more messages and customization options.

Highlights
  • Handwritten digital letters
  • Daily message exchange
  • Timeline and widget view
  • Save and reorder letters
  • Premium features for more messages
  • Customization options
Features
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loveU ― “手書きで気持ちを伝える”ふたり専用レターアプリ loveU は、ふたりだけの手書きレターを毎日送り合えるコミュニケーションアプリです。 スマホで描いた小さなキャンバスと一言メッセージが、その日の気持ちをまるごと保存します。 描いたレターは、タイムラインとホーム画面ウィジェットに反映。 通知を開かなくても、相手からの最新レターをふとした瞬間に確認できます。 レターはあとから並べ替えたり保存したりでき、手書きの温度感そのままに、ふたりの思い出が積み上がっていきます。 プレミアムプランについて 無料プランでは、1日3通までレターを送信できます。 プレミアムでは、1日10通までのレター送信、複数ペア、色・カレンダー・ボードカラー・写真などの機能を利用できます。 週間プランと年間プランをご用意しています。料金はアプリの購入画面にApp Storeから取得した現在価格を表示します。サブスクリプションは自動更新で、管理・解約はApple IDのアカウント設定から行えます。 決済は App Store 経由です。 ■ 安心して使うために 不快な行為や不適切な内容はアプリ内から通報でき、相手をブロックすると手紙、チャット、共有ボード、通知、Widget更新を停止します。 アカウントは「設定 > アカウント > アカウントを削除」から削除できます。Apple ID連携済みの場合は連携解除も行います。アカウント削除だけではサブスクリプションは解約されません。 ■ 利用規約・プライバシーポリシー 利用規約(Terms of Use / EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ loveU サービス利用規約: https://loveu.appful.tokyo/terms プライバシーポリシー(Privacy Policy): https://loveu.appful.tokyo/privacy

Screenshots

UnderLine4 screens
loveU(ラブユー)4 screens

Verdict

The call

The clearest difference is ads: UnderLine at none against loveU(ラブユー)'s shown. UnderLine also leads on iOS requirement (15.6 vs 26.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

UnderLine ships an update every 3 days, loveU(ラブユー) every 4 days. Both last shipped on November 12, 2026.

Scorecard2 real differences · 6 level
UnderLine versus loveU(ラブユー): the parameters behind the verdict, then further details
ParameterUnderLineloveU(ラブユー)
PriceFreeFree
Positive reviews—31.3% of reviews
Update frequencyEvery 3 days — betterEvery 4 days
AdsNo — betterYes
In-app purchasesNoNo
Monetization—Free with in-app purchases
DevicesiPhone, iPod — betteriPhone
Requires iOS15.6 — better26.0
Further details — not scored
Size73 MB54 MB
Age rating17+4+
Developer5mmRyusei Okamoto

In-app purchases

None

UnderLine

No in-app purchases

None

loveU(ラブユー)

No in-app purchases

Questions

Is UnderLine free?
UnderLine is free to download, with no in-app purchases.
Is loveU(ラブユー) free?
loveU(ラブユー) is free to download, with no in-app purchases.
Do UnderLine or loveU(ラブユー) have ads?
loveU(ラブユー) shows ads; UnderLine does not.
Which is updated more often, UnderLine or loveU(ラブユー)?
UnderLine ships an update every 3 days, and loveU(ラブユー) every 4 days. Most recently, UnderLine was updated on November 12, 2026 and loveU(ラブユー) on November 12, 2026.

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