ちゃっとも vs UnderLine
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ちゃっとも
Connect with new people through group or one-on-one chats. Create or join groups based on shared interests and engage in lively conversations. Enjoy a simple, anonymous, and secure platform for making friends.
- Free to use
- Group chat functionality
- One-on-one private messaging
- Anonymous user profiles
- Interest-based groups
- User reporting and blocking
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◆ちゃっともとは◆ 完全無料で全ての機能が使える友達作りチャットアプリです! グループトークで盛り上がろう! グループを作成して、趣味や話題ごとにみんなでワイワイ会話。 他にはないグループチャット機能が人気の秘密! 1対1チャットで気が合う友達と 気になる人を見つけたら、個別メッセージでじっくりトーク。 お気に入り機能で仲良くなった友達をキープ! カンタン・匿名・安心 ニックネームを入力するだけで即スタート。 メールアドレスや電話番号の登録は一切不要! ◆こんな人におすすめ◆ ・暇な時間にサクッと友達と話したい ・同じ趣味の仲間を見つけたい ・学生同士、社会人同士で気軽に雑談したい ・グループで盛り上がる場所がほしい ・匿名で安心して使いたい ◆安心・安全の取り組み◆ ・24時間モニタリング体制 ・不適切なユーザーの通報・ブロック機能 ・出会い目的の利用禁止(利用規約で明記) ◆注意事項◆ 以下の行為はサービスの利用停止の対象となります。 ・個人情報や連絡先の交換 ・直接の出会いを目的とした利用 ・卑猥・過激なメッセージ、画像の投稿 ・勧誘、宣伝目的の利用 ・誹謗中傷
UnderLine
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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 - 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.
Screenshots
Verdict
The clearest difference is ads: UnderLine at none against ちゃっとも's shown. UnderLine also leads on iOS requirement (15.6 vs 17.0). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ちゃっとも ships an update every 3 days, UnderLine every 2 days. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.
| Parameter | ちゃっとも | UnderLine |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (16 ratings) — better | — |
| Number of ratings | 16 — better | — |
| Update frequency | Every 3 days | Every 2 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 37 MB | 67 MB |
| Age rating | 17+ | 17+ |
| Developer | ONETT | 5mm |
In-app purchases
ちゃっとも
No in-app purchases
UnderLine
No in-app purchases









