Comparison

SMARTアドレス帳 for Local Sync vs IIJ SmartKey

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

Head to head
About

SMARTアドレス帳 for Local Sync

This contact management app offers familiar features for organizing contacts, including group creation, bulk messaging, and birthday notifications. It allows for easy searching and management of your address book.

Highlights
  • Group creation and editing
  • Bulk email sending
  • Birthday notifications
  • Favorite contact filtering
  • Contact search by name, email, or number
  • Call history display
Features
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SMARTアドレス帳 for Local Syncはケータイで使いなれた機能や操作性を実現した電話帳アプリです。 グループの作成や編集と一斉送信、誕生日通知など多彩な機能を搭載しています。 【慣れ親しんだ便利機能】 ■グループ作成/編集/並び替え  グループだけの一覧表示やグループの作成と名称の変更、グループの並び替えができます。  家族だけや友達だけ、同僚だけのグループなどの連絡先を管理するだけではなくメールの一斉送信もできます。 ■誕生日通知  家族や友人の連絡先に誕生日を登録しておけば、誕生日に通知されます。 ■お気に入り設定  お気に入りの連絡先だけを表示させることができます。 ■検索機能  電話帳に登録している連絡先を名前やメールアドレス、電話番号から検索できます。 ■登録件数表示  電話帳に登録している連絡先の件数を表示することができます。 ■発信履歴  SMARTアドレス帳から発信した連絡先の履歴が表示されます。 <注意事項・連絡事項>  ・『SMARTアドレス帳』もしくは、『KDDI SMARTアドレス帳』の同期モードで利用するアプリです。  ・『KDDI SMARTアドレス帳』のフルクラウドモードをご利用の場合は、別アプリ「SMARTアドレス帳 for Full Cloud」をご利用ください。  ・シークレット機能は、iOSの仕様変更に伴い利用できなくなりました。  ※SMARTアドレス帳(法人様向けサービス)へご加入の方は、ログインしていただくとクラウド連携機能をご利用いただけます。  (CardDAV設定をすることでアドレス帳の共有機能をご利用いただけます。詳細は、法人向けサービスのマニュアルをご参照ください。)

About

IIJ SmartKey

This app generates one-time passwords for two-step verification, enhancing online security. It supports TOTP standards and offers slide authentication for convenient logins. Additional features include app locking and cross-device data backup.

Highlights
  • Generates TOTP one-time passwords
  • Supports slide authentication
  • App locking with Touch ID/passcode
  • Cross-device data backup
  • Compatible with Google Authenticator
Features
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Only enterprise user needs to register your device. You can skip registering your device, if you don't need it. The IIJ SmartKey app produces one-time passwords that conform to TOTP (RFC 6238) standards and can be used in the 2-step verification processes of a variety of online services supporting TOTP. Strengthen your online service security by linking this app, installed to your smartphone device, with your ID/password verification processes. Slide authentication can be used (ver 2.0). When logging in to a service that supports slide authentication, you will receive a push notification on your smartphone. Then you can pull the service icon for 2-step verification. For details, please visit http://www.iij.ad.jp/biz/smartkey-m/ (Written in Japanese). * To use slide authentication, you must register your device. ■ Special Features * Protects against unauthorized access by allowing the user to lock the app using a Touch ID or passcode. * Supports device changes and data backups by handing over settings between devices. * Compatible with the Google Authenticator (TOTP authentication). * Supports slide authentication. * Easy to see and read, simple and refined design. ■ Confirmed Supported Services (TOTP authentications) * Amazon Web Services * Dropbox * Evernote * Facebook * GitHub * Google Accounts * Google Apps for Work * IIJ Omnibus * IIJ Secure MX Service * Microsoft Accounts * Slack * WordPress.com ■ Confirmed Supported Services (Slide authentications) * Additional details on available services is expected soon. ■■ Please make sure to read the information below before using the app. * When switching devices, please check the app help page (https://www1.auth.iij.jp/smartkey/en/help_v2.html) before transferring service settings from your old device to the new one. * Please ensure that you confirm service restoration procedures for the various online services you utilize in advance to protect yourself against cases in which you are unable to complete the 2-step verification process due to device loss or accidental deletion of service settings. * When backing up this app to iTunes, it is necessary to encrypt the backup files. This app does not support backups to the iCloud service. ■User Agreement All users of this app must consent to the User Agreement found below before using the app. https://www1.auth.iij.jp/smartkey/en/agreement_v2.html ----- Mentioned company names and service names are the trademarks or registered trademarks of their respective companies.

Screenshots

SMARTアドレス帳 for Local Sync4 screens
IIJ SmartKey4 screens

Verdict

The call

The clearest difference is in-app purchases: IIJ SmartKey at none against SMARTアドレス帳 for Local Sync's 1. IIJ SmartKey also leads on iOS requirement (12.0 vs 14.0). SMARTアドレス帳 for Local Sync's advantage is update cadence (every 2 months vs every 9 months). On price, review sentiment, 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. SMARTアドレス帳 for Local Sync sells 1 one-off in-app purchase. IIJ SmartKey asks for nothing beyond the download.

UpkeepUpdate frequency

SMARTアドレス帳 for Local Sync ships an update every 2 months, IIJ SmartKey every 9 months. Both last shipped on November 1, 2026.

Scorecard4 real differences · 4 level
SMARTアドレス帳 for Local Sync versus IIJ SmartKey: the parameters behind the verdict, then further details
ParameterSMARTアドレス帳 for Local SyncIIJ SmartKey
PriceFreeFree
Positive reviews7.8% of reviews10.0% of reviews — better
Update frequencyEvery 2 months — betterEvery 9 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPodiPhone, iPod
Requires iOS14.012.0 — better
Further details — not scored
Size8 MB19 MB
Age rating4+4+
DeveloperNeos CorporationInternet Initiative Japan, Inc.

Customer experience

SMARTアドレス帳 for Local Sync

Written reviews51 reviews
Positive7.8%
Neutral5.9%
Negative86.3%

IIJ SmartKey

Written reviews20 reviews
Positive10.0%
Neutral5.0%
Negative85.0%

In-app purchases

1 purchases

SMARTアドレス帳 for Local Sync

One-time1
  • 機能制限の解除$1.99
None

IIJ SmartKey

No in-app purchases

Questions

Is SMARTアドレス帳 for Local Sync free?
SMARTアドレス帳 for Local Sync is free to download, with in-app purchases available.
Is IIJ SmartKey free?
IIJ SmartKey is free to download, with no in-app purchases.
Do SMARTアドレス帳 for Local Sync or IIJ SmartKey have ads?
Neither SMARTアドレス帳 for Local Sync nor IIJ SmartKey shows ads.
Which is updated more often, SMARTアドレス帳 for Local Sync or IIJ SmartKey?
SMARTアドレス帳 for Local Sync ships an update every 2 months, and IIJ SmartKey every 9 months. Most recently, SMARTアドレス帳 for Local Sync was updated on November 1, 2026 and IIJ SmartKey on November 1, 2026.

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