Comparison

ソナエノート vs Unletter

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

Head to head
About

ソナエノート

Features
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【こんな方におすすめ】 ・防災グッズを購入したいけれど、何が必要かわからない ・自分に必要な備蓄量を知りたい ・買い物リストを作って、計画的に備蓄品を揃えたい ・備蓄品の消費期限や在庫を管理したい 【主な機能】 1. 必要な備蓄量を自動診断 家族構成、ペットの有無など、あなたのご家庭に合わせて必要な備蓄品/備蓄量を診断し、チェックリストを作成します。チェックリストで不足品が一目で確認できます。 2. 診断結果を買い物リストに登録 診断で出た結果は、ワンタップで買い物リストに追加。買い物をする際に、リストを見ながら効率よく備蓄品を揃えられます。買い物リストは自由に編集できるので、ご自身で必要なアイテムを追加することも可能です。 3. 購入品を備蓄リストで一元管理 買った商品は備蓄リストに登録しましょう。商品名、数量、消費期限、収納場所、写真などを記録できます。「どこに何があるか」が一目でわかるので、いざという時に慌てることがありません。 4. 消費期限切れをPUSH通知でお知らせ 消費期限が近づくと、PUSH通知でお知らせします。通知のタイミングは自由に設定でき、食品や飲料水のローリングストック(日常的に消費しながら備蓄する方法)にも最適です。 5. カテゴリ・収納場所で絞り込み検索 登録した備蓄品は、カテゴリや収納場所で絞り込み検索。必要なものをすぐに見つけられます。

About

Unletter

Features
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Unletter lets you seal today’s feelings in a special envelope and open them in the future. ■ Write a letter and seal it Add photos or your voice to your message, then seal the envelope with wax. Once you choose a day to open it, the contents stay hidden until that day arrives. ■ A note you can see before opening Keep the contents hidden while leaving a short note about the promise—when, where, with whom, and on what occasion to open it. You can revisit the note any time while you wait. ■ A one-of-a-kind wax seal Each time you seal a letter, a wax seal is created with a unique color and shape. It becomes a special seal for your letter alone. ■ When the day comes Three months, six months, a year, or further into the future—a notification arrives on the day you chose. Break the seal, open the envelope, and meet your letter again in the future. ■ Collect them in your Letterbox Your letters line up in the Letterbox. Browse your shelf of envelopes or collect each unique wax seal in the Seal Collection. Your own collection grows with every letter. ■ A letter for someone dear “To someone dear” does not send the letter to another device. It stays in your Unletter so you can open it together, on the same device, on the day you choose. ■ For moments like these • Share today’s dreams and worries with your future self • Save words for an anniversary to open with someone dear • Mark a milestone such as coming of age, graduation, or a wedding ■ Leave your voice (Pro) When words aren’t enough, leave up to 3 minutes of your voice. Hearing your own voice—or the voice of someone dear—in the future can become a gift unlike any other. ■ Saved here, with optional iCloud sync Letters you create, or download and save from iCloud, are kept on this device with an integrity-checked copy. Saved letters work offline and stay here when you turn sync off. When updating from V1, Unletter automatically recovers iCloud letters, respecting earlier off settings. Letters not yet downloaded need access to the Apple Account’s iCloud where they were saved, then download and on-device saving. Initial recovery only receives letters. Turn on sync in Settings to automatically sync all existing and new letters both ways with your iCloud. The developer cannot access your letters’ contents. ■ Deleting a letter Deleting removes the letter and attachments from this device. When sync is on and connected, deletion also reaches the same Apple Account’s iCloud and syncing V1.1 devices. Offline deletions are recorded here and applied when sync is on and connected again. Today’s heart, kept for the future.

Screenshots

ソナエノート4 screens
Unletter4 screens

Verdict

The call

The clearest difference is in-app purchases: ソナエノート at none against Unletter's 1. ソナエノート also leads on update cadence (weekly vs every 5 months). Unletter's advantage is ads (none vs shown). On price, device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Unletter sells 1 one-off in-app purchase. ソナエノート asks for nothing beyond the download.

UpkeepUpdate frequency

ソナエノート ships an update weekly, Unletter every 5 months. The most recent releases landed on November 5, 2026 and November 10, 2026 respectively.

Scorecard3 real differences · 3 level
ソナエノート versus Unletter: the parameters behind the verdict, then further details
ParameterソナエノートUnletter
PriceFreeFree
Update frequencyWeekly — betterEvery 5 months
AdsYesNo — better
In-app purchasesNo — betterYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.017.0 — better
Further details — not scored
Size25 MB8 MB
Age rating4+4+
DeveloperMatsusaka E.D.P CenterYusuke Yoshida

In-app purchases

None

ソナエノート

No in-app purchases

1 purchases

Unletter

One-time1
  • Unletter Pro$5.99

Questions

Is ソナエノート free?
ソナエノート is free to download, with no in-app purchases.
Is Unletter free?
Unletter is free to download, with in-app purchases available.
Do ソナエノート or Unletter have ads?
ソナエノート shows ads; Unletter does not.
Which is updated more often, ソナエノート or Unletter?
ソナエノート ships an update weekly, and Unletter every 5 months. Most recently, ソナエノート was updated on November 5, 2026 and Unletter on November 10, 2026.

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