Comparison

HDI Authenticator vs Fasoo Secure Viewer

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

Head to head
About

HDI Authenticator

Features
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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. β€» 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

HDI Authenticator4 screens
Fasoo Secure Viewer4 screens

Verdict

The call

The clearest difference is update cadence: Fasoo Secure Viewer at every 6 weeks against HDI Authenticator's every 4 months. HDI Authenticator's advantage is iOS requirement (11.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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

UpkeepUpdate frequency

HDI Authenticator ships an update every 4 months, Fasoo Secure Viewer every 6 weeks. The most recent releases landed on October 7, 2026 and October 10, 2026 respectively.

Scorecard2 real differences Β· 4 level
HDI Authenticator versus Fasoo Secure Viewer: the parameters behind the verdict, then further details
ParameterHDI AuthenticatorFasoo Secure Viewer
PriceFreeFree
Update frequencyEvery 4 monthsEvery 6 weeks β€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 β€” better15.0
Further details β€” not scored
Size22 MB118 MB
Age rating4+4+
DeveloperKOREAEXPERTFasoo AI Co., Ltd.

In-app purchases

None

HDI Authenticator

No in-app purchases

None

Fasoo Secure Viewer

No in-app purchases

Questions

Is HDI Authenticator free?
HDI Authenticator 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 HDI Authenticator or Fasoo Secure Viewer have ads?
Neither HDI Authenticator nor Fasoo Secure Viewer shows ads.
Which is updated more often, HDI Authenticator or Fasoo Secure Viewer?
HDI Authenticator ships an update every 4 months, and Fasoo Secure Viewer every 6 weeks. Most recently, HDI Authenticator was updated on October 7, 2026 and Fasoo Secure Viewer on October 10, 2026.

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