Comparison

Pressure Vessel Pro vs Bellows Design Software

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

Bellows Design Software

This application assists in designing metallic bellows type expansion joints according to EJMA Standards. It allows users to input various design parameters and movement inputs to ensure safe and reliable usage. The software performs comprehensive calculations and checks against EJMA conditions for different bellows configurations and materials.

Highlights
  • Design metallic bellows expansion joints
  • Input internal diameter, convolution height, ply thickness, pitch, and number of plies
  • Set design pressure, temperature, and movements
  • Check design parameters against EJMA Standards
  • Calculations for single and dual bellows
  • Includes vibration and bellows forming methods
  • Calculations for tie rods, lugs plate, and hinges
Read full description

Bellows Design Software is developed based on EJMA Standards 10th edition. Useful in designing Metallic Bellows type Expansion joints for safe and reliable usage. Select Internal Diameter of Bellows, Convolution Height, Ply thickness, Pitch and Number of Plies. Set Design Pressure and Temperature. Choose Bellows Materials,  Input Axial, Lateral and Angular Movements. Include Collar, Spool and Cycle Life and GO. App checks the design parameters with all set of Conditions to be met as per EJMA Standard. Calculations include Single, Dual Bellows with over a long list of Materials. Other Features : Includes Vibration, Bellows Forming Methods - ( in the creep range, above the creep range ) Calculations for Annealed Bellows. Set Factors - Weld Factor, Fatigue Safety Factor and Forming Method Factor Set Constants for Axial Vibration and Lateral Vibration. Separate Calculations for Tie Rods, Lugs Plate and Hinges are included. Terms of Use : https://sites.google.com/view/bellowsdesignsoftware Privacy Policy : https://sites.google.com/view/bellowsdesignsoftware

Screenshots

Pressure Vessel Pro4 screens
Bellows Design Software4 screens

Verdict

The call

The clearest difference is price: Bellows Design Software at Free against Pressure Vessel Pro's $5.99. Bellows Design Software also leads on rating (5.0 vs 4.5) and update cadence (monthly vs every 5 months). Pressure Vessel Pro's advantage is in-app purchases (none vs 2) and iOS requirement (12.0 vs 16.0). On ratings volume, 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

Bellows Design Software is free to download; Pressure Vessel Pro costs $5.99 up front. Bellows Design Software sells 2 in-app purchases, starting at $34.99 per month. Pressure Vessel Pro asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Bellows Design Software 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, Bellows Design Software monthly. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.

Scorecard6 real differences · 4 level
Pressure Vessel Pro versus Bellows Design Software: the parameters behind the verdict, then further details
ParameterPressure Vessel ProBellows Design Software
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 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS12.0 — better16.0
Further details — not scored
Size10 MB26 MB
Age rating4+4+
DeveloperJ.R.HobbsV PUGAZHENTHI

Customer experience

Pressure Vessel Pro

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

Bellows Design Software

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

In-app purchases

None

Pressure Vessel Pro

No in-app purchases

2 purchases

Bellows Design Software

Subscriptions2
  • All Access for Bellows3 Days trial$34.991 Month
  • All Access for Bellows Design14 Days trial$299.991 Year

Questions

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

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