Comparison

TeraStudy vs Parallel Accounts・Dual Space

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

Head to head
About

TeraStudy

Features
Read full description

TeraStudyとは? 学習アプリの種類が多すぎて迷っていませんか? 複数の科目を1つのアプリで学びたいと思ったことはありませんか? TeraStudyはそんなお悩みを解決するために生まれた試験型学習教育アプリです。 スキマ時間を活用して学習することで、持続的なスキルアップを目指せます。 主な特徴: - 多岐にわたる学習コンテンツ 「ビジネスマナー」「動画作成」「プログラミング」など、幅広い分野の学習コンテンツを提供しています。 - 多様な学習形式 一問一答形式、動画、文章形式の学習コンテンツを通じてインプットし、さらに実際のテストでアウトプットすることが可能です。 - 充実した復習機能 テストで間違えた問題は、付箋やメモ機能を使って効率的に復習できます。 - 学習のPDCAサイクルを1つのアプリで実現 TeraStudyを活用することで、計画、実行、確認、改善の学習サイクルをこのアプリ1つで完結できます。 法人向け利用  法人向けでは、Web版を活用して組織管理者が自作のコンテンツをアップロードし、組織員に公開することで、社内コンテンツのデータベースとしてご利用いただけます。  また、組織員の学習進捗やテスト結果を管理することが可能で、以下のようなメリットがあります: - コンテンツの社内定着度を測定:社内でのコンテンツ理解度を数値化できます。 - データを基にした正確な評価:学習・テスト結果を基に、適切な人材評価が可能です。 法人利用をご希望の方は、ワンダフルフライ株式会社のホームページよりお問い合わせください。 TeraStudyは、個人の学習から法人での教育管理まで幅広く活用できる次世代の学習ツールです。

About

Parallel Accounts・Dual Space

This app lets you run multiple instances of the same application on a single device. Easily manage separate work and personal profiles, social media, or game accounts in a secure, private space. Switch between accounts instantly and manage notifications without conflict.

Highlights
  • Clone apps for dual accounts
  • Private and secure secondary space
  • Fast account switching
  • Manage notifications from all accounts
  • Intuitive and clean interface
  • Optional passcode/biometric lock
Features
Read full description

Parallel Accounts・Dual Space is a smart utility app that allows you to clone and manage multiple accounts of the same app on one device. Perfect for separating work and personal profiles, social media, messaging, or game accounts — all within a secure and easy-to-use interface. KEY FEATURES: - App Cloning: Use two accounts of the same app simultaneously. - Private Space: Keep your secondary apps and data separate and secure. - Fast Switching: Instantly switch between accounts with a single tap. - Notifications Management: Get alerts from both accounts without conflict. - Clean Interface: Minimal and intuitive design for smooth multitasking. - Secure Access: Optional passcode or biometric lock for added privacy. Download Parallel Accounts・Dual Space today and enjoy seamless control over multiple accounts on one device. Payment will be charged to the credit card connected to your iTunes Account when you confirm the initial subscription purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current subscription period. Your account will be charged for renewal within 24-hours prior to the end of the current period, and the cost of the renewal will be identified. You may manage your subscription and auto-renewal may be turned off by going to your Account Settings after the purchase. Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription, where applicable. Terms of Use: https://docs.google.com/document/d/1TA9i4K-6MfyEq7-1PBbVipNVALBxb9MEJi0IP5Aj-vo/edit?usp=sharing Privacy Policy: https://docs.google.com/document/d/1VUDYOl6J1o9dvpf6pQ9sjKD6jwZN2BRUGTwTpHi-xQg/edit?usp=sharing

Screenshots

TeraStudy4 screens
Parallel Accounts・Dual Space4 screens

Verdict

The call

The clearest difference is in-app purchases: TeraStudy at none against Parallel Accounts・Dual Space's 6. TeraStudy also leads on update cadence (every 5 days vs every 4 months) and iOS requirement (11.0 vs 17.0). On price, 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. Parallel Accounts・Dual Space sells 6 in-app purchases, starting at $1.99 per 7 days. TeraStudy asks for nothing beyond the download.

UpkeepUpdate frequency

TeraStudy ships an update every 5 days, Parallel Accounts・Dual Space every 4 months. The most recent releases landed on October 30, 2026 and November 4, 2026 respectively.

Scorecard3 real differences · 7 level
TeraStudy versus Parallel Accounts・Dual Space: the parameters behind the verdict, then further details
ParameterTeraStudyParallel Accounts・Dual Space
PriceFreeFree
Rating—4.5 (282 ratings) — better
Positive reviews—11.1% of reviews
Number of ratings—282 — better
Update frequencyEvery 5 days — betterEvery 4 months
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS11.0 — better17.0
Further details — not scored
Size89 MB42 MB
Age rating4+4+
Developerワンダフルフライ株式会社Marius Ardeleanu

In-app purchases

None

TeraStudy

No in-app purchases

6 purchases

Parallel Accounts・Dual Space

Subscriptions6
  • Safely organize your accounts$1.997 Days
  • Dual Accounts3 Days trial$2.997 Days
  • Safely organize your accounts$5.997 Days
Show 3 more
  • Manage accounts effortlessly3 Days trial$5.997 Days
  • Easily switch between accounts$19.991 Month
  • Easily switch between accounts$39.991 Year

Questions

Is TeraStudy free?
TeraStudy is free to download, with no in-app purchases.
Is Parallel Accounts・Dual Space free?
Parallel Accounts・Dual Space is free to download, with in-app purchases available.
Do TeraStudy or Parallel Accounts・Dual Space have ads?
Neither TeraStudy nor Parallel Accounts・Dual Space shows ads.
Which is updated more often, TeraStudy or Parallel Accounts・Dual Space?
TeraStudy ships an update every 5 days, and Parallel Accounts・Dual Space every 4 months. Most recently, TeraStudy was updated on October 30, 2026 and Parallel Accounts・Dual Space on November 4, 2026.

Other comparisons