Comparison

Mohr's Circle vs Engineering Survey Calculator

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

Head to head
About

Mohr's Circle

This application assists users in performing Mohr's Circle calculations and verifying their diagrams. It offers solutions for 2D plane stress, calculates various stress values, and generates graphical representations of stress states. Users can also share results and store multiple stress states.

Highlights
  • 2D Plane Stress Mohr's Circle Solutions
  • Max, Min, and Shear Stress Calculations
  • Principal Stress Plane Angle
  • Mohr's Circle Diagram
  • Stress State Rotation Views
  • Shareable Results
  • Unit Conversion (English/Metric)
Features
Currently charting
Read full description

Do you need to perform a Mohr's Circle calculation? Would you like to make sure you Mohr's Circle diagram is correct? With the power of your iOS device and this app, you can do this quickly and easily. (5 Stars) "Perfect…Great tool, great app!" -The fever, the focus Mohr's Circle Calculates: ● 2D Plane Stress Mohr's Circle Solutions ● Max Stress ● Min Stress ● Max Shear Stress ● Average Stress ● Principal Stress Plane Angle ● Max Shear Stress Plane Angle ● The normal stress at an arbitrary angle ● The tangential stress at an arbitrary angle ● The shear stress at an arbitrary angle Mohr's Circle Graphs 4 Views Including: ● Mohr's Circle Diagram ● Stress State Rotated to the Principal Stress Plane ● Stress State Rotated to the Max Shear Stress Plane ● Stress State Rotated to an arbitrary angle Mohr's Circle Features: ● Universal App (Designed for both the iPhone and iPad) ● Share your results via a printout or email ● View the equations used to calculate the results ● Store as many stress states as you want for future reference Units Included! Independently set input and output units both English and Metric. Check out our other engineering apps by searching the App Store for: • Pressure Vessel Pro • Moments of Inertia • Stress Concentrations Pro • Stress Intensity Factors Pro or search J.R.Hobbs to see them all. AppStore.com/JRHobbs

About

Engineering Survey Calculator

This app provides 33 essential calculators for surveying, measurement, and civil engineering tasks. It supports both Imperial (USCS) and Metric (SI) units, making it a versatile tool for engineers and surveyors on iOS devices.

Highlights
  • 33 specialized calculators
  • Surveying and measurement tools
  • Civil engineering parameters
  • Imperial (USCS) and Metric (SI) units
  • Available for iPhone and iPad
Features
Read full description

The field companion for surveyors and civil engineers — 42 calculators, reference tables, and field tools in USCS and SI units. Engineering Survey Calculator covers the everyday math of land surveying, from tape corrections to vertical curves, with instant results, clearly stated formulas, and one-tap unit switching. CALCULATORS — grouped the way you work • Errors & Precision: standard deviation, probable errors, error of the mean, full observation sets • Taping Corrections: temperature, tension, sag, slope — individually or chained into one corrected length • Leveling: curvature & refraction, reciprocal leveling, relative accuracy orders • Traverse: latitudes & departures, misclosure, precision ratio, Bowditch adjustment, area by coordinates • Curves: horizontal circular curves (T, L, C, M, E, D) and parabolic vertical curves with high/low point • Stadia & Tacheometry, Earthwork volumes, Photogrammetry scales, and angle converters (DMS ⇄ decimal, azimuth ⇄ bearing) AUTO-FILL REFERENCE DATA Tap the magic wand to fill tape constants, instrument constants, camera focal lengths, and accuracy coefficients from built-in reference tables — no more hunting through handbooks. A dedicated Reference tab keeps all tables one tap away, in your chosen unit system. FIELD TOOLS • GPS field points: capture coordinates and elevation, then get distance and elevation difference between points • Clinometer: measure slope angles with your device's sensors • DMS quick-entry keyboard for angle inputs SAVE, ORGANIZE, SHARE Save any calculation to a project, attach field notes and photos, share results, and export a whole project as a PDF report. BUILT FOR THE FIELD • USCS and SI units everywhere, one tap apart • Formulas shown with every result • Favorites and search • Dark mode, iPhone and iPad (side-by-side split view) • Works fully offline • Available in English, German, Spanish, French, Italian, Dutch, Portuguese, and Chinese (Simplified) Questions or suggestions? contact.pugal.apps@gmail.com

Screenshots

Mohr's Circle4 screens
Engineering Survey Calculator4 screens

Verdict

The call

The clearest difference is review sentiment: Mohr's Circle at 43% against Engineering Survey Calculator's 0%. Mohr's Circle also leads on chart position (#191 vs unranked) and ratings volume (3 vs 1). Engineering Survey Calculator's advantage is rating (5.0 vs 3.3) and price ($2.99 vs $5.99). On update cadence, ads, in-app purchases and monetization model 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

Mohr's Circle costs $5.99 and Engineering Survey Calculator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Engineering Survey Calculator holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews complicate that: 43% of Mohr's Circle's written reviews are positive against 0% of Engineering Survey Calculator's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Mohr's Circle ships an update every 15 months, Engineering Survey Calculator every 24 months. The most recent releases landed on September 16, 2026 and September 18, 2026 respectively.

Scorecard6 real differences · 5 level
Mohr's Circle versus Engineering Survey Calculator: the parameters behind the verdict, then further details
ParameterMohr's CircleEngineering Survey Calculator
Price$5.99$2.99 — better
Rating3.3 (3 ratings)5.0 (1 ratings) — better
Positive reviews42.9% of reviews — better0.0% of reviews
Number of ratings3 — better1
Update frequencyEvery 15 months — betterEvery 24 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank#191 — better—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better16.0
Further details — not scored
Size8 MB6 MB
Age rating4+4+
DeveloperJ.R.HobbsV PUGAZHENTHI

Customer experience

Mohr's Circle

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews7 reviews
Positive42.9%
Neutral28.6%
Negative28.6%

Engineering Survey Calculator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

In-app purchases

None

Mohr's Circle

No in-app purchases

None

Engineering Survey Calculator

No in-app purchases

Questions

Is Mohr's Circle free?
Mohr's Circle costs $5.99, with no in-app purchases.
Is Engineering Survey Calculator free?
Engineering Survey Calculator costs $2.99, with no in-app purchases.
Which has better reviews, Mohr's Circle or Engineering Survey Calculator?
Engineering Survey Calculator is rated higher. Mohr's Circle averages 3.3 out of 5 from 3 ratings, while Engineering Survey Calculator averages 5.0 from 1 ratings.
Do Mohr's Circle or Engineering Survey Calculator have ads?
Neither Mohr's Circle nor Engineering Survey Calculator shows ads.
Which is updated more often, Mohr's Circle or Engineering Survey Calculator?
Mohr's Circle ships an update every 15 months, and Engineering Survey Calculator every 24 months. Most recently, Mohr's Circle was updated on September 16, 2026 and Engineering Survey Calculator on September 18, 2026.

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