Comparison

プリペイドSIM屋さん vs Letter

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

Head to head
About

プリペイドSIM屋さん

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プリペイドSIM屋さんは、日本国内で利用可能な電話番号付きプリペイドSIM・プリペイドeSIMの購入から開通後の管理まで、アプリひとつで完結できるサービスです。 必要なプランを選んで購入し、eSIMならすぐに開通手続きへ進めます。購入後は、データ容量や利用期限をアプリ上でリアルタイムに確認できるため、残りギガ数や有効期限をいつでも把握できます。 利用期間の延長にも対応しており、必要なタイミングで手動延長することはもちろん、サブスクによる自動延長も設定できます。期限切れの心配を減らし、継続して安心してご利用いただけます。 データ容量が足りなくなった場合は、アプリからギガリチャージが可能です。リチャージ内容は即時反映されるため、急にデータ容量が必要になったときにもスムーズに追加できます。 さらに、面倒な本人確認手続きやクレカ登録など一切不要で即日でSMS受信可能な電話番号付きの回線を開通できます。 ※音声プランをご利用の場合は本人確認が必要です。 アカウント情報の確認・変更、購入履歴の確認、各種設定もアプリ内で管理できます。 主な機能 ・プリペイドSIM / eSIMの購入 ・SMS受信対応の電話番号発行 ・購入後の即時開通手続き・好きなタイミングで開通 ・データ容量のリアルタイム確認 ・利用期限のリアルタイム確認 ・利用期間の延長 ・手動延長 / サブスク自動延長の設定 ・プッシュ通知で回線の利用期限通知 ・ギガリチャージ ・リチャージ内容の即時反映 ・購入履歴の確認 ・アカウント設定 プリペイドSIM屋さんアプリは、購入後の管理までかんたんに行いたい方に向けた、シンプルで使いやすいプリペイドSIM管理アプリです。

About

Letter

Features
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Briefo: Letter Write, Post Mail makes it simple to create a letter digitally and send physical mail worldwide. Write and customize your document, choose a template, add a signature, select print and delivery options, and track your order from one place. Whether you want to send a personal letter, card, document, or other written correspondence, Briefo combines a practical letter editor with physical postal delivery. Prepare your mail without printing pages, preparing an envelope, or visiting a mailbox yourself. WRITE AND CUSTOMIZE YOUR LETTER Create a letter with the editor and customize your text before sending. Choose a template, prepare a multi-page letter, add page numbers when needed, or save your work as a draft and return later. Templates can help with common personal and everyday correspondence, including cancellation notices, complaints, requests, authorizations, formal notices, and personal letters across Europe and other destinations worldwide. ADD YOUR SIGNATURE Personalize your correspondence by uploading your signature as an image or drawing a hand signature directly for your letter. SEND PHYSICAL MAIL WORLDWIDE Briefo turns the letter you prepare digitally into physical mail for delivery to your selected destination. Save sender and recipient details to make preparing future letters more convenient. Briefo can be used for personal mail and correspondence addressed to military or army recipients, as well as jail, prison, or inmate correspondence where applicable. Institutions and destinations may have their own incoming mail rules, and Briefo does not guarantee acceptance or delivery by a particular recipient or institution. TRACK YOUR ORDER Use the postal tracker to track your order and receive order notifications. Keep sent letters organized and view your letter list inside the app. Features: * Write and customize letters * Select a letter template * Create multi-page letters and add page numbers * Upload a signature image or draw a hand signature * Choose black-and-white or color printing * Select available delivery and layout options * Save letters as drafts * Save recipients and senders * Track orders with the postal tracker * Receive order notifications * Export letters as PDF * Sync across devices * Send physical mail worldwide FREE ACCESS Free users can view their letter list and create and save recipient, sender, and signature information. PREMIUM ACCESS Sending physical letters requires sufficient credits. Credits can be purchased through in-app purchases. The required credits for each letter are calculated instantly based on that order, including page count, destination, delivery options, and layout options. You can see the calculated credit requirement before sending. IMPORTANT DISCLAIMER Briefo is a service for preparing and sending physical correspondence. Delivery and acceptance may depend on the destination, postal services, recipient, institution, and applicable mail rules. References to military, army, jail, prison, or inmate mail describe possible correspondence use cases and do not imply affiliation with or endorsement by any government, military, correctional institution, postal authority, or other third party. Privacy Policy: getbriefo.com/en/privacy Terms of Use: getbriefo.com/en/terms Support: support@getbriefo.com

Screenshots

プリペイドSIM屋さん3 screens
Letter4 screens

Verdict

The call

The clearest difference is in-app purchases: プリペイドSIM屋さん at none against Letter's 6. On price, update cadence, ads 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. Letter sells 6 one-off in-app purchases. プリペイドSIM屋さん asks for nothing beyond the download.

UpkeepUpdate frequency

プリペイドSIM屋さん ships an update every 9 days, Letter every 5 days. The most recent releases landed on October 31, 2026 and November 10, 2026 respectively.

Scorecard1 real difference · 5 level
プリペイドSIM屋さん versus Letter: the parameters behind the verdict, then further details
ParameterプリペイドSIM屋さんLetter
PriceFreeFree
Update frequencyEvery 9 daysEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad — betteriPhone
Requires iOS17.016.4 — better
Further details — not scored
Size26 MB70 MB
Age rating17+4+
DeveloperLinkMobile k.kVUNYO

In-app purchases

None

プリペイドSIM屋さん

No in-app purchases

6 purchases

Letter

One-time6
  • Credit$1.99
  • Credit$4.99
  • Credit$6.99
Show 3 more
  • Credit$9.99
  • Credit$19.99
  • Credit$49.99

Questions

Is プリペイドSIM屋さん free?
プリペイドSIM屋さん is free to download, with no in-app purchases.
Is Letter free?
Letter is free to download, with in-app purchases available.
Do プリペイドSIM屋さん or Letter have ads?
Neither プリペイドSIM屋さん nor Letter shows ads.
Which is updated more often, プリペイドSIM屋さん or Letter?
プリペイドSIM屋さん ships an update every 9 days, and Letter every 5 days. Most recently, プリペイドSIM屋さん was updated on October 31, 2026 and Letter on November 10, 2026.

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