CypherGuard PDF vs SimpleVenti
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CypherGuard PDF
View and access protected PDF documents using advanced cryptographic technology. This application allows you to open regular PDFs and securely view encrypted files after authentication.
- View protected PDF documents
- Open encrypted PDF files
- Authentication for secure access
- Supports regular PDF documents
- Content protection features
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This is a viewer for CypherGuard PDF (https://www.cyphertec.co.jp/services/cypherguard/products/#CypherGuard_PDF), which protects PDF documents using cryptographic technology. In addition to regular PDF documents, you can also view encrypted PDF documents after authentication. * CypherGuard PDF content files (.cpd files) that the distributor does not permit viewing on iOS cannot be viewed. * To protect the content, this app does not support file printing.
SimpleVenti
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Professional-grade ventilation calculations and duct sizing made accessible to everyone. From HVAC professionals to DIY enthusiasts, this app simplifies complex engineering calculations. ■ Key Features • Automatic ventilation requirement calculation • Optimal duct sizing • Calculation history management • Intuitive user interface ■ Supported Calculations • Ventilation requirements (m³/h) • Duct cross-sectional area (circular & rectangular) • Air velocity & pressure loss • Various ventilation systems ■ Highlights • No technical knowledge required • Accurate calculation results • Offline functionality • Japanese & English support Perfect for architectural design, HVAC design, construction management, and more.
Screenshots
Verdict
The clearest difference is ads: CypherGuard PDF at none against SimpleVenti's shown. SimpleVenti's advantage is update cadence (every 5 weeks vs every 5 months) and iOS requirement (12.0 vs 14.0). On price, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
CypherGuard PDF ships an update every 5 months, SimpleVenti every 5 weeks. The most recent releases landed on June 7, 2026 and September 6, 2026 respectively.
| Parameter | CypherGuard PDF | SimpleVenti |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 5 months | Every 5 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 29 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | CypherTec Inc. | Kotaro Tanaka |
In-app purchases
CypherGuard PDF
No in-app purchases
SimpleVenti
No in-app purchases
