Comparison

Pressure Vessel Pro vs Optical Surface Recognition

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

Head to head
About

Pressure Vessel Pro

Perform essential pressure vessel stress calculations with ease. Input dimensions for various tank geometries and instantly get results, including detailed formulae and ASME code compliance. Generate and share PDF reports with schematics.

Highlights
  • Pressure vessel stress calculations
  • ASME Boiler & Pressure Vessel Code compliance
  • Support for vertical, horizontal, and spherical tanks
  • Component stress calculations (cylinders, heads)
  • Generate and share PDF reports
  • Flexible unit system (Metric/English)
  • Save multiple calculation cases
Features
Read full description

Pressure Vessel Pro - Pressure vessel calculations for iOS. The easiest way to do basic pressure vessel stress calculations. Simply select from the available geometries, enter in the required dimensions and the answers will be generated complete with the formulae. You can also easily print or email a PDF of your results along with a schematic of the pressure vessel. Pressure Vessel Pro Features: - Universal - designed for use on all sizes of iPhone, iPod Touch, and iPad - Share or print a PDF report of the results - Extremely flexible unit system. Choose Metric, English or mix and match units. - Save multiple cases for later reference - Tap a cell to show detail and formulae The properties calculated include are: • Longitudinal Stress • Hoop Stress • Shear Stress • Volume • ASME Boiler & Pressure Vessel Code Design Thickness • ASME Boiler & Pressure Vessel Code Design Pressure Pressure Vessel Pro includes the Following Integrated Calculations: • Vertical tanks • Horizontal tanks • Spherical tanks Pressure Vessel Pro includes the Following Component Stress Calculations: • Cylinders • Hemispherical Heads and Tanks • Elliptical Heads • Torispherical Heads Pressure Vessel Pro includes the Following ASME Boiler and Pressure Vessel Code Section VIII, Division I Design Calculations: • Cylinder Thickness • Cylinder Pressure • Hemispherical Heads and Tanks Thickness • Hemispherical Heads and Tanks Pressure • 2:1 Elliptical Head Thickness • 2:1 Elliptical Head Pressure • ASME (dished) Heads Thickness • ASME (dished) Heads Pressure Check out our other engineering apps by searching the iTunes store for: • Moments of Inertia • Mohr's Circle • Stress Concentrations Pro • Stress Intensity Factors Pro or search J.R.Hobbs to see them all.

About

Optical Surface Recognition

This utility app uses computer vision to scan surfaces for signs of corrosion on various metal types. It allows users to capture photos and record videos of detected corrosion, saving them with a proprietary score.

Highlights
  • Detects corrosion on various metal surfaces
  • Scans flat metal, nails, bolts, signs, poles, grates
  • Captures photos with corrosion score
  • Records videos with corrosion score
  • Saves media to device photo roll
Features
Read full description

Optical Surface Recognition (OSR) is a unique technology which can scan surfaces for signs of surface degradation (corrosion). It can also detect corrosion on almost any type of metal, including exposed flat metal, nails, bolts, signs, poles, and grates. PHOTOS Capture photos of corrosion and save to your device's photo roll along with the OSR corrosion score in a custom generated image. VIDEOS Record entire videos with the proprietary OSR corrosion score and save them to your photo roll.

Screenshots

Pressure Vessel Pro4 screens
Optical Surface Recognition3 screens

Verdict

The call

The clearest difference is price: Optical Surface Recognition at Free against Pressure Vessel Pro's $5.99. Optical Surface Recognition also leads on rating (5.0 vs 4.5) and update cadence (every 2 weeks vs every 5 months). On ratings volume, ads, 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

CostPrice · In-app purchases · Ads · Monetization

Optical Surface Recognition is free to download; Pressure Vessel Pro costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Optical Surface Recognition holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

UpkeepUpdate frequency

Pressure Vessel Pro ships an update every 5 months, Optical Surface Recognition every 2 weeks. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.

Scorecard4 real differences · 6 level
Pressure Vessel Pro versus Optical Surface Recognition: the parameters behind the verdict, then further details
ParameterPressure Vessel ProOptical Surface Recognition
Price$5.99Free — better
Rating4.5 (2 ratings)5.0 (1 ratings) — better
Positive reviews33.3% of reviews—
Number of ratings2 — better1
Update frequencyEvery 5 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.012.0
Further details — not scored
Size10 MB17 MB
Age rating4+4+
DeveloperJ.R.HobbsEngineering Director, Inc.

Customer experience

Pressure Vessel Pro

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive33.3%
Neutral66.7%
Negative0.0%

Optical Surface Recognition

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Pressure Vessel Pro

No in-app purchases

None

Optical Surface Recognition

No in-app purchases

Questions

Is Pressure Vessel Pro free?
Pressure Vessel Pro costs $5.99, with no in-app purchases.
Is Optical Surface Recognition free?
Optical Surface Recognition is free to download, with no in-app purchases.
Which has better reviews, Pressure Vessel Pro or Optical Surface Recognition?
Optical Surface Recognition is rated higher. Pressure Vessel Pro averages 4.5 out of 5 from 2 ratings, while Optical Surface Recognition averages 5.0 from 1 ratings.
Do Pressure Vessel Pro or Optical Surface Recognition have ads?
Neither Pressure Vessel Pro nor Optical Surface Recognition shows ads.
Which is updated more often, Pressure Vessel Pro or Optical Surface Recognition?
Pressure Vessel Pro ships an update every 5 months, and Optical Surface Recognition every 2 weeks. Most recently, Pressure Vessel Pro was updated on October 5, 2026 and Optical Surface Recognition on October 7, 2026.

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