Memkeep vs 秒速日記
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Memkeep
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Memkeep is a shared diary for the people you love most. Some moments are too good to keep to yourself — and too personal to post on social media. Memkeep is a private, end-to-end encrypted memory book you build together with your partner, your closest friends, or your family. No followers. No ads. No algorithm. Just the two (or three, or four) of you. WHY MEMKEEP IS DIFFERENT • Truly private — every photo and word is end-to-end encrypted by default. Not a paid upsell. Not "encryption in transit." Real E2E. We can't read your memories. Nobody can but you and the people you invite. • Works offline, syncs later — built on a local-first architecture, so the app is fully usable on a plane, on a hike, or anywhere with no signal. Your entries sync automatically the moment you reconnect. • Built for two (or a few) — Memkeep is designed for couples and small friend groups. Create a shared space, invite your partner or your closest friends, and start writing. Family use is supported too. • No social media patterns — no likes, no follower counts, no public profiles, no algorithm deciding what you see. Just your shared timeline, in chronological order, the way memories actually happen. WHAT YOU CAN DO • Create a shared diary space and invite the people who matter • Write entries with text, photos, and dates • Comment and react on each other's memories • Browse a clean month-by-month timeline of your story • Keep a separate personal diary alongside your shared spaces • Use it on a flight, in the mountains, or anywhere offline PERFECT FOR • Couples — capture date nights, trips, anniversaries, and the small daily moments that make a relationship • Long-distance partners — stay close even when you're apart, with a private feed only you two can see • Close friend groups — document trips, inside jokes, and the years you spend together • Families — build a shared memory book across generations, without putting your kids on Instagram PRIVACY YOU CAN VERIFY Most "private" diary apps store your data in plain text on someone else's server. Memkeep doesn't. Your words and photos are encrypted on your device before they ever leave it. Even we, the developers, can't read them. Your shared diary belongs to you and the people you invited — nobody else. LOCAL-FIRST, BY DESIGN Memkeep is built on a modern local-first architecture (powered by Jazz CRDT). That means: instant writes, no spinners, no "trying to reconnect" errors, and a real app that keeps working when your signal doesn't. START TODAY Open Memkeep, create your first shared space in under a minute, and invite your favorite person. Build your story, one memory at a time. The little moments are the ones you'll want to remember in five years — Memkeep is where they go. Made with care for couples, friends, and families who believe their memories are theirs to keep. — — — Questions, feedback, or feature requests? We'd love to hear from you: hello@memkeep.app
秒速日記
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メッセージアプリで発言するように、思いついた瞬間に開いて、そのまま書ける日記アプリです。 ひとことで終わる日も、しっかり書いた日も、同じ1冊に並びます。1日に何回でも書けて、書いたものは誰にも届きません。 ■ 開いたら、もう書ける 選ぶものはありません。開いて、打って、送る。それだけで今日の記録になります。 ■ 短くても、長くてもいい ひとことで終わる日も、しっかり書き込んだ日も、同じ日記帳に並びます。長さの決まりはありません。書きたいだけ書いて、ひとことで終わる日はそのまま送れば大丈夫です。 ■ 1日に何回でも メッセージアプリに送るように、思いついたぶんだけ足していけます。時刻はあとから直せるので、「昨日の分」もその場で書けます。 ■ ちゃんと日記として残る 書いた日にはカレンダーに印がつき、日付をタップすればその日の記録だけが並びます。本文の検索にも対応。写真は1つの記録に最大4枚まで、タイムラインに並べて表示され、タップすれば大きく見られます。 ■ SNSに疲れた人のための日記 このアプリに、他の人へ共有する機能はありません。フォロワーもいいねも足あともなく、書いたものが誰かに届くことは一度もありません。反応を気にせず、思ったままを置いておける場所です。 パスコードと生体認証(指紋・顔認証)でアプリ全体をロックできます。写真は非公開の場所に保存され、共有リンクは作られません。 ■ 日記帳を分けて持てる ふだんの日記と、育児の記録と、仕事のメモ。用途で分けて2冊まで(プレミアムなら何冊でも)。表紙の写真も変えられます。 ■ 自分の見た目にする テーマカラー、背景画像、フォント、ダークモード。アプリアイコンも選べます。 ■ 機種変更しても引き継げる 会員登録なしですぐ書きはじめられます。あとから Apple または Google アカウントを連携しておけば、新しい端末でも続きから書けます。 ■ 料金について 無料で使えます。画面の下にバナー広告が表示されます。 プレミアム(月額/年額・初回は7日間無料) ・バナー広告が消えます ・日記帳が何冊でも作れます ・写真が1つの記録に50枚まで(無料は4枚) ・写真のクラウド保存容量が1GBまで(無料は100MB) ・テキスト・PDF・CSVで書き出して印刷できます(写真ごと1冊にまとめられます) ・ホーム画面ウィジェットが5つまで使えます 初回加入の方が無料期間の対象です。無料期間の終了までに解約すれば料金はかかりません。サブスクリプションは自動更新され、解約は各ストアの設定から行えます。 いちばん軽く持てる日記です。今日のひとことから、はじめてみてください。 利用規約(EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is ads: Memkeep at none against 秒速日記's shown. 秒速日記's advantage is update cadence (every 2 days vs every 3 weeks) and device support (3 vs 1). On price, in-app purchases and iOS requirement 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. Memkeep sells 1 one-off in-app purchase and 秒速日記 sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
Memkeep ships an update every 3 weeks, 秒速日記 every 2 days. The most recent releases landed on October 28, 2026 and October 29, 2026 respectively.
| Parameter | Memkeep | 秒速日記 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 2 days — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 92 MB | 90 MB |
| Age rating | 12+ | 4+ |
| Developer | Burak Harun YILDIZ | takafumi naito |
In-app purchases
Memkeep
- Notebook$4.99
秒速日記
- プレミアム(月額)7 Days trial$1.991 Month
- プレミアム(年額)7 Days trial$11.991 Year









