Comparison

OTAC auth vs Fasoo Secure Viewer

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

Head to head
About

OTAC auth

Features
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Experience rapid and secure user/device authentication through OTAC's 8-character code. โ— Quick and Easy, No Registration: Streamlined authentication without the hassle of sign-up or login processes. Your privacy is paramount; no personal information required. โ— Secure Authentication with OTAC Code: Ensure robust security with time-sensitive OTAC codes. Safely access your accounts using a code that expires after a specific duration. โ— Manage Multiple Accounts Easily: Effortlessly authenticate multiple accounts using a single OTAC auth app. Register and manage up to 20 accounts securely.

About

Fasoo Secure Viewer

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Fasoo Secure Viewer is a document security solution optimized for mobile environments. It offers significantly improved security features compared to previous versions, greatly enhancing the user experience. With Fasoo Secure Viewer, users can securely access encrypted documents on their devices anytime, anywhere, and perform their tasks efficiently. Note: The Fasoo Secure Viewer app is only available for users authenticated in FED-M. Non-authenticated users will not be able to access both encrypted and non-encrypted plain documents. Main features: - Supports document viewing and editing with permission-based access control. โ€ป Available document permissions may vary depending on the purchased license type and administrator settings. - Displays screen watermarks. - Prevents screen captures. - Provides features for document search and management. - Controls document access based on location. Supported file formats 1. View & Edit - MS Word 97 ~ (*.doc, *.docx, *.dot, *.dotx) - MS PowerPoint 97 ~ (*.ppt, *.pptx, *.pps, *.ppsx. *.pot, *.potx) - MS Excel 97 ~ (*.xls, *.xlsx, *.xltx, *.csv) - Adobe PDF 1.2 ~ 1.7 (*.pdf) 2. View only - Hangul 97 ~ 3.0, 2002 ~ 2014 (*.hwp, *.hwpx) - Text files (*.txt) - Image files (*.bmp, *.jpg, *.png, *.gif, *.wmf, *.emf, *.jpeg, *.tiff)

Screenshots

OTAC auth4 screens
Fasoo Secure Viewer4 screens

Verdict

The call

OTAC auth and Fasoo Secure Viewer are too close to call on the numbers: across 6 compared parameters โ€” price, update cadence, ads and in-app purchases among them โ€” neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

ScorecardNo meaningful differences
OTAC auth versus Fasoo Secure Viewer: the parameters behind the verdict, then further details
ParameterOTAC authFasoo Secure Viewer
PriceFreeFree
Update frequencyEvery 6 weeksEvery 6 weeks
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details โ€” not scored
Size10 MB118 MB
Age rating4+4+
DeveloperswIDch LimitedFasoo AI Co., Ltd.

In-app purchases

None

OTAC auth

No in-app purchases

None

Fasoo Secure Viewer

No in-app purchases

Questions

Is OTAC auth free?
OTAC auth is free to download, with no in-app purchases.
Is Fasoo Secure Viewer free?
Fasoo Secure Viewer is free to download, with no in-app purchases.
Do OTAC auth or Fasoo Secure Viewer have ads?
Neither OTAC auth nor Fasoo Secure Viewer shows ads.
Which is updated more often, OTAC auth or Fasoo Secure Viewer?
OTAC auth ships an update every 6 weeks, and Fasoo Secure Viewer every 6 weeks. Most recently, OTAC auth was updated on November 4, 2026 and Fasoo Secure Viewer on October 30, 2026.

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