Period vs Sotto(そっと)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Period
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Want to know when everyone’s free? Need to schedule a meeting or practice during free periods? That’s where Comma comes in. Comma is a free scheduling app designed for university students. All you have to input is your available class periods—that’s it. See everyone’s free slots and plan your events smoothly. Comma also comes with smart features to make entering your availability fast and easy. ■ Features – Column Selection If you’re free all day, just tap once to select the entire day’s free periods. – Weekly Schedule Register your typical weekly free periods in advance and apply them with one tap. Input becomes even easier when you set your timetable. – Paste Feature If you have overlapping scheduling periods, you can paste availability from other events. ■ How to Use – For Organizers: Create an event, share the invitation link with your group, and enter your availability. – For Participants: Click the invite link, join the event, and enter your free periods. ■ Ideal For Club or team practice Group meetings Study sessions ...and many other group activities!
Sotto(そっと)
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選んでAI 選択した文章を、そのままAIに質問。 アプリを開く必要はありません。 コピー&ペーストも不要です。 文章を選択 → 共有 → 「選んでAI」 これだけで、意味・返信・言い換えを瞬時に生成します。 主な機能 ・文章の意味をわかりやすく解説 ・失礼のない返信文を自動生成 ・丁寧な言い換えに変換 ・共有拡張対応(どのアプリからでも利用可能) SNS、メール、チャット、ニュース記事など あらゆる文章を、すぐにAIへ。 シンプルで静かなAI体験を。
Screenshots
Verdict
The clearest difference is in-app purchases: Sotto(そっと) at none against Period's 1. Period's advantage is device support and iOS requirement (15.1 vs 17.6). On price 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. Period sells 1 one-off in-app purchase. Sotto(そっと) asks for nothing beyond the download.
| Parameter | Period | Sotto(そっと) |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly | — |
| Ads | Yes | — |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod — better | — |
| Requires iOS | 15.1 — better | 17.6 |
| Further details — not scored | ||
| Size | 45 MB | 4 MB |
| Age rating | 4+ | 12+ |
| Developer | TOMOKI KAMO | Yatuki Misora |
In-app purchases
Period
- プレミアムパス$2.99
Sotto(そっと)
No in-app purchases









