PDF Notes S vs Trench Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PDF Notes S
This app offers a dual-page PDF viewer with smooth scrolling and fast page turns. It also provides document management, quick previews of various file types, and annotation tools. An upgrade removes ads and unlocks full functionality.
- Dual-page PDF viewer
- Horizontal/vertical scroll and page turns
- Document browser for file organization
- Quick Look for various file types
- ZIP file preview without unzipping
- 8 handwriting tools
- Cache manager for fast page turns
Read full descriptionHide full description
PDF Notes S gives you a 2 pages viewer with horizontal/vertical scroll, and cache for fast page turns, and thumbnails scrollbar. PDF Notes S gives you ZIP Preview, Quick Look of documents, images, music, videos, and etc. PDF Notes S gives you Document Browser so that you can organize all your files very easily. PDF Viewer - 1 page or 2 pages, horizontal or vertical fast page turns - Scroll or page turns by tap on sides - 8 handwriting tools that you can adjust color and line width - Horizontal or vertical thumbnails scrollbar - PDF outlines, bookmarks, and annotations list - PDF search - Cache manager supports 3 modes, permanent cache, automatic cache, and no cache Quick Look, ZIP Preview - PDF, RTF, TEXT - iWork documents, Office documents - Images, Music, PiP Videos - Without Unzip, preview ZIP contents (password may be requested if locked) Advertisements before upgrade - Banner ads can be shown at the bottom - Interstitial ads can be shown per 30 minutes Information about the auto-renewable nature of the subscription - Payment will be charged to iTunes Account at confirmation of purchase. - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. A link to privacy policy and terms of use - http://blog.musebook.com/2017/03/privacy-policy.html The length of the subscription - Monthly or Yearly NOTE: All content contained herein is subject to change without notice.
Trench Calculator
Read full descriptionHide full description
The Trench Calculator App is built for civil, utility, and excavation professionals who need fast, accurate trench volume calculations in the field or in the office. Easily create projects with multiple trench runs, input your trench geometry and pipe data, and instantly calculate: Excavation area and volume Bedding and backfill quantities Pipe volume and total material estimates Fine-tune trench dimensions including depth, bottom width, side slopes (angle of repose), and bedding thickness. View results in cubic yards or cubic meters with visual cross-sections for clarity. When you’re done, quickly export clean PDF or CSV reports to share with clients, managers, engineers, or inspectors — no logins required. Key Features: Create multiple trench runs within projects Visual trench cross-section with labeled dimensions Calculates excavation, bedding, backfill, and pipe volumes Multiple trench profiles to choose from Adjustable slopes and bedding parameters Instant unit conversion (ft/in → yd³, ft²) Export results to PDF and CSV Offline capable – perfect for field use No advertisements Ideal for civil engineers, inspectors, utility contractors, and field crews who value accuracy, speed, and simplicity. Take the guesswork out of trench design and material estimation — download Trench Calculator today. Terms of Use: Apple’s standard Licensed Application End User License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/.
Screenshots
Verdict
The clearest difference is ads: Trench Calculator at none against PDF Notes S's shown. PDF Notes S's advantage is update cadence (every 6 weeks vs every 4 months) and iOS requirement (13.0 vs 15.1). 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. PDF Notes S sells 2 in-app purchases, starting at $0.99 per month and Trench Calculator sells 1 in-app purchase, starting at $1.49 per month. Whichever you choose, the download price is not the number that matters.
PDF Notes S ships an update every 6 weeks, Trench Calculator every 4 months. The most recent releases landed on June 10, 2026 and September 5, 2026 respectively.
| Parameter | PDF Notes S | Trench Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (5 ratings) — better | — |
| Positive reviews | 52.9% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 6 weeks — better | Every 4 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 22 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | AMuseTec Co., Ltd. | Linesite Tech |
In-app purchases
PDF Notes S
- Monthly Plan$0.991 Month
- Yearly Plan$9.991 Year
Trench Calculator
- Trench Calculator – Monthly Plan$1.491 Month









