Comparison

Pressure Vessel Pro vs Acceleration Calculator Plus

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

Acceleration Calculator Plus

Features
Read full description

Solve kinematics equations instantly with Acceleration Calculator — the essential physics tool for students, teachers, and engineers. 5 Calculation Modes • Acceleration: a = (v − u) / t • Final Velocity: v = u + at • Initial Velocity: u = v − at • Time: t = (v − u) / a • Distance: s = ut + ½at² Smart Features • Auto-calculate results as you type • Built-in unit conversions for velocity (m/s, km/h, mph), time (s, min), and distance (m, km, ft) • Inline input validation with clear error messages • Tap to copy results to clipboard Velocity–Time Graph Visualize motion with an interactive velocity vs. time chart powered by Swift Charts. See how velocity changes over time for any calculation. Animated Motion Preview Watch a projectile animate across the screen to build intuitive understanding of acceleration and uniform motion. Calculation History Every result is saved automatically. Review past calculations, swipe to delete, or tap to reload values back into the calculator. Formula Reference Quick-access reference sheet with all five kinematic formulas, variable definitions, and unit conversion tables. Designed for Everyone • Clean, minimal interface following Apple Human Interface Guidelines • Full Dark Mode support • Localized in English and Chinese (Simplified) • No ads. No subscriptions. No internet required. Perfect for high school physics, AP Physics, university mechanics, engineering coursework, or anyone who needs a quick kinematics calculation on the go. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

Screenshots

Pressure Vessel Pro4 screens
Acceleration Calculator Plus4 screens

Verdict

The call

The clearest difference is update cadence: Pressure Vessel Pro at every 5 months against Acceleration Calculator Plus's every 20 months. Pressure Vessel Pro also leads on iOS requirement (12.0 vs 17.6). Acceleration Calculator Plus's advantage is price ($2.99 vs $5.99). On 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

Pressure Vessel Pro costs $5.99 and Acceleration Calculator Plus $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Pressure Vessel Pro ships an update every 5 months, Acceleration Calculator Plus every 20 months. The most recent releases landed on September 17, 2026 and September 5, 2026 respectively.

Scorecard3 real differences · 7 level
Pressure Vessel Pro versus Acceleration Calculator Plus: the parameters behind the verdict, then further details
ParameterPressure Vessel ProAcceleration Calculator Plus
Price$5.99$2.99 — better
Rating4.5 (2 ratings) — better—
Positive reviews33.3% of reviews—
Number of ratings2 — better—
Update frequencyEvery 5 months — betterEvery 20 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better17.6
Further details — not scored
Size10 MB1 MB
Age rating4+4+
DeveloperJ.R.HobbsNitrio

In-app purchases

None

Pressure Vessel Pro

No in-app purchases

None

Acceleration Calculator Plus

No in-app purchases

Questions

Is Pressure Vessel Pro free?
Pressure Vessel Pro costs $5.99, with no in-app purchases.
Is Acceleration Calculator Plus free?
Acceleration Calculator Plus costs $2.99, with no in-app purchases.
Do Pressure Vessel Pro or Acceleration Calculator Plus have ads?
Neither Pressure Vessel Pro nor Acceleration Calculator Plus shows ads.
Which is updated more often, Pressure Vessel Pro or Acceleration Calculator Plus?
Pressure Vessel Pro ships an update every 5 months, and Acceleration Calculator Plus every 20 months. Most recently, Pressure Vessel Pro was updated on September 17, 2026 and Acceleration Calculator Plus on September 5, 2026.

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