Comparison

Tug Horse Power vs Simple Scan

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

Head to head
About

Tug Horse Power

Features
Read full description

Bollard Pull Calculator The app will calculate the required bollard pull and power to push or tow a barge or group of barges in open water or inland waterways (protected waters). The calculations can be certified by Det Norske Veritas (DNV) or for 3rd party surveyors. App is useful for tug operators, captains, operational management, and Naval Architects and Marine Engineers involved in Marine Towing Operations for selection of tug for push/towing operations. What does this App do? This app uses data collected by the user to calculate the tug's power and bollard pull required to push a barge at a specified speed and environment. The app also calculates the tugs power and bollard pull required for a storm condition to hold a barge. The bollard pull is shown in MT and required Power of the tug is in HP and kW. It is recommended to have a Bollard Pull certificate for the tug but is not required as it is already factored into the calculations. The app should be used to select the appropriate tug (propulsion system) based on the required Bollard Pull. Alternatively, it can be used to check whether a selected tug is suitable before the towing operation proceed. How to use this app? The apps inputs are in red. The input requires barge dimensions (although this doesn't have to be a barge) and deck cargo dimensions to calculate the areas the environment will act upon. The calculations are in black and automatically update with each input. Once finished with the inputs, use the print button to air print, save as a PDF or email PDF. The input values will be saved on the app allowing the user to still take calls, email, etc. without losing their data entry. When the app is closed, the app will reset to the default values. No internet connection is required to save the output as a PDF or to use the app. The print output or pdf can be used in a report to submit to client. A 1" margin at top and bottom can be used for your company info using Adobe or similar PDF editor. Do not edit the calculated values in pdf editor and always save a PDF copy of the calculations for your records. All calculations are done using DNV recommendations and Naval Architecture and Marine Engineering best practices. These calculations can be certified by DNV using the PDF printout. Additional details about the scope of work is provided by you such as the deck layout, selected tug, and vessel certificates. The input units for this app are English. A SI (metric) version of this app is available in the App Store. All the calculations are in SI units and converted back to English units. This is required by most 3rd party certification agencies operating in the USA. Limitations: It is up to the user to input good data into the app. The hull of the vessel is input into the app and those calculations are already done for you. The area of the cargo requires the user to measure the front and side areas for input into the app. It is best to estimate it as a rectangle rather than measure every item and add their areas. This will save time and it is better to overestimate than underestimate wind area. Stability calcuations should be done separately to ensure vessel safety and proper seafastening is installed. References 1. DNV-RP-H103, 2011, Sec 7.2.6 2. ABS Rules for Building and Classing Mobile Offshore Drilling Units, 2019, C 3-1-2/1.3.2

About

Simple Scan

Easily convert paper documents into searchable PDFs or images in seconds. This app offers a streamlined scanning experience without cluttering your existing notes, with options to share directly via email, messages, or other applications. Enjoy private, on-device processing with no ads.

Highlights
  • Scan documents to PDF or JPEG
  • Searchable PDFs with OCR
  • Share scans via email, messages, or system share sheet
  • Custom file destinations
  • File naming suggestions (Apple Intelligence required)
  • On-device processing
  • No ads
Features
Read full description

Simple Scan is the quick, easy way to scan paper documents to optimized, searchable PDF documents (or images) and send them almost anywhere. ## FEATURES ## * Same great scanning functionality as Notes, but no need to clutter your notes data with one-off scans * Create high-resolution multi-page PDFs from your paper documents * PDFs are searchable thanks to automatic Optical Character Recognition (OCR) * Built for simplicity. Just scan and send – no document library * Send scans via email or messages. Save to a file, or "Share" use to send to other apps via the system share sheet * Set up message destinations with pre-filled recipients for easy "Email to Myself" and other common uses * Custom file destinations save scans directly to a pre-selected folder without extra taps * File naming suggestions, such as names, dates, pulled from the scanned document (requires Apple Intelligence) * Save scans directly to Photos * Option to output as images (JPEG) instead of PDF * Quality option to control file size * Never any ads. Ever. * Private and on-device. All scan processing is done locally on your device. ## SIMPLE SCAN PRO ## Simple Scan is free to download and try! To continue using Simple Scan, unlock Simple Scan Pro--available as a low-cost, annual subscription or a one-time lifetime unlock purchase. ## SUBSCRIPTION DETAILS ## * Payment will be charged to your Apple account at confirmation of purchase * Your subscription will automatically renew unless auto-renew is disabled at least 24 hours before the end of the current subscription period * Automatic renewals will be charged at the same price you were initially charged for the subscription * Subscriptions can be managed or canceled by going to Account Settings on the App Store after purchase Have questions? Email support@agiletortoise.com. Terms: https://agiletortoise.com/terms Privacy Policy: https://agiletortoise.com/privacy-policy

Screenshots

Tug Horse Power4 screens
Simple Scan4 screens

Verdict

The call

The clearest difference is price: Simple Scan at Free against Tug Horse Power's $19.99. Simple Scan also leads on update cadence (monthly vs every 4 months). Tug Horse Power's advantage is in-app purchases (none vs 2) and iOS requirement (14.5 vs 17.4). On 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

Simple Scan is free to download; Tug Horse Power costs $19.99 up front. Simple Scan sells 2 in-app purchases, starting at $9.99 per year. Tug Horse Power asks for nothing beyond the download.

UpkeepUpdate frequency

Tug Horse Power ships an update every 4 months, Simple Scan monthly. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.

Scorecard4 real differences · 6 level
Tug Horse Power versus Simple Scan: the parameters behind the verdict, then further details
ParameterTug Horse PowerSimple Scan
Price$19.99Free — better
Rating—4.9 (672 ratings) — better
Positive reviews—87.5% of reviews
Number of ratings—672 — better
Update frequencyEvery 4 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.5 — better17.4
Further details — not scored
Size1 MB22 MB
Age rating4+4+
DeveloperMatthew RicciardoAgile Tortoise

Bugs and requests

Tug Horse Power

Not enough reviews yet to summarise bugs or requests.

Simple Scan

Reported bugs

2 issues
  • Crashes on multi-page scans for some users
  • Issues with importing files from other apps

Requested features

3 requests
  • Ability to tag scans
  • Favorite file/app destination options
  • More image adjustment tools

In-app purchases

None

Tug Horse Power

No in-app purchases

2 purchases

Simple Scan

Subscriptions1
  • Pro - Annual$9.991 Year
One-time1
  • Pro - Lifetime$39.99

Questions

Is Tug Horse Power free?
Tug Horse Power costs $19.99, with no in-app purchases.
Is Simple Scan free?
Simple Scan is free to download, with in-app purchases available.
Do Tug Horse Power or Simple Scan have ads?
Neither Tug Horse Power nor Simple Scan shows ads.
Which is updated more often, Tug Horse Power or Simple Scan?
Tug Horse Power ships an update every 4 months, and Simple Scan monthly. Most recently, Tug Horse Power was updated on November 7, 2026 and Simple Scan on November 8, 2026.

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