Comparison

Perfect Structure vs calc318

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

Head to head
About

Perfect Structure

Design and optimize reinforced concrete columns and beams with support for multiple international design codes and languages. Generate reports in PDF, CSV, and DXF formats, and share them with colleagues. Offers a user-friendly interface for quick and flexible structural analysis.

Highlights
  • Reinforced concrete column and beam design
  • Support for 5 international design codes
  • Multilingual support (8 languages)
  • Output in PDF, CSV, and DXF formats
  • Modern and user-friendly interface
  • Design checks and optimal reinforcement calculation
Features
Read full description

Design and optimize reinforced concrete columns and beams easily with this App. . Language support for English, German, French, Italian, Spanish, Portuguese, Russian and Turkish. Supported design codes include ACI 318, Eurocode 2, BS 8110, SP 63.13330 and TS 500. Execute your design in seconds and receive the results in PDF, CSV and DXF formats. Share your calculation report with your colleagues over the internet. Fast and flexible. Key Features: - Modern and User Friendly Design - 5 Design Codes: ACI 318, Eurocode 2, BS 8110, SP 13330 and TS 500 - 8 Languages: English, German, French, Italian, Spanish, Portuguese, Russian and Turkish - 2 Units Systems: Metric (SI) & Imperial - 3 Different File Formats for Output: PDF, CSV, DXF - Reinforced Concrete Column Section Types: Rectangular, Circular, Hallow Rectangular and Hallow Circular - Reinforced Concrete Beam Section Types: Rectangular, T-beam, I-beam, Box-beam (Hollow Core) - Design of both singly and doubly reinforced beams - Draw interaction diagrams for columns - Checks given reinforcement against given loads and section parameters OR calculates optimal reinforcement amount against given loads - Calculates and checks both flexural reinforcement and shear reinforcement We hope you will enjoy using it and highly appreciate your valuable feedback. Perfect Structure is the ultimate tool for engineers to design and check the load bearing capacity of reinforced concrete members. Test your structure on the go! With its intuitive and contemporary interface, Perfect Structure brings the best of UX to your mobile phones and tablets. Execute your design and receive the results in PDF, CSV and DXF formats. Share your calculation report with your colleagues over the internet. Fast and flexible, Perfect Structure is the everyday tool for the perfect engineer who wants to have the mobility of a smartphone or a tablet without a compromise. Just launch your Perfect Structure app, use the buttons on the main screen for a column or a beam, select the section type, enter the dimension and load data, assign steel and concrete grades and leave the rest to your app by hitting the “Calculate” button. The results will be ready in moments with a clear and concise results screen. Then, select the PDF, CSV and DXF output options if you’d like to send the results to others, save the report in your project folder or inspect your column or beam layout in a CAD software. Use the settings page for a variety of options from user feedback to design code selection. See how your design complies with the design codes by getting the design check results according to the relevant code. Try and test different reinforcement bar arrangements and member dimensions to get to the optimal configuration. Phenomenally easy to use and flexible, Perfect Structure will get you to the result in a matter of seconds with a top-notch user experience. Tags: Reinforced Concrete Column Design, Reinforced Concrete Beam design, Reinforced Concrete, Structural Design, Structural Optimization, design of reinforced concrete members, PDF output, shear design, moment design, high strength concrete, high strength steel, reinforcement steel, column interaction diagram.

About

calc318

Instantly solve 175 ACI 318-19 equations with live computation and interactive charts. Understand equation behavior with sensitivity graphs and clear variable descriptions. Designed for engineers needing quick, accurate calculations and insights.

Highlights
  • 175 ACI 318-19 equations solved instantly
  • Live computation with unit awareness
  • Interactive sensitivity graphs
  • Professionally formatted equations
  • Complete variable descriptions
  • Smart search functionality
  • Recents tab for quick access
Features
Read full description

Solve all 175 equations from ACI 318-19 Appendix C, instantly, in US Customary Units. Calc318 turns the equations from ACI 318-19 Appendix C into a live calculator. Pick an equation, enter your parameters, and get an answer the moment you type — beautifully rendered, with every variable clearly defined and unit-aware. No spreadsheets, no hand calcs. calc318 requires an auto-renewable subscription. Start your 7-day free trial — no charge until the trial ends, and you can cancel anytime. After the trial, your subscription continues at $12.99/year or $2.99/month. Manage or cancel anytime in Settings → Apple ID → Subscriptions. See more than just a number. Tap any input to open an interactive chart that shows exactly how your result responds as that parameter changes — with a draggable point and a family of curves for the other key variables, so you understand the behavior of the equation, not just one data point. FEATURES: - Live computation for all 175 ACI 318-19 equations, fully unit-aware. - Professionally formatted equations with LaTeX-quality rendering. - Interactive sensitivity graphs — drag a point and watch the result update in real time. - Compare curves across multiple parameter values to see trends at a glance. - Complete variable descriptions and units for every input. - Smart search by section number, chapter, keyword, or variable. - Recents tab to jump back to equations you use most. - Clean, intuitive interface designed for engineers. Whether you're checking a calculation, running a quick sensitivity study, or referencing design provisions, calc318 gets you the answer — and the insight behind it — in seconds. Privacy Policy: https://aiosciv.com/calc318/ Terms of Use (EULA): http://www.apple.com/legal/itunes/appstore/dev/stdeula

Screenshots

Perfect Structure4 screens
calc3184 screens

Verdict

The call

The clearest difference is monetization model: Perfect Structure at free with in-app purchases against calc318's subscription. Perfect Structure also leads on update cadence (every 2 days vs every 3 months) and device support (3 vs 1). calc318's advantage is ads (none vs shown). On price, rating, ratings volume and in-app purchases 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

Both are free to download. Perfect Structure sells 1 one-off in-app purchase and calc318 sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Perfect Structure against 5.0 for calc318. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

Perfect Structure ships an update every 2 days, calc318 every 3 months. The most recent releases landed on October 11, 2026 and October 1, 2026 respectively.

Scorecard5 real differences · 5 level
Perfect Structure versus calc318: the parameters behind the verdict, then further details
ParameterPerfect Structurecalc318
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews—100.0% of reviews
Number of ratings11
Update frequencyEvery 2 days — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterSubscription
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better26.0
Further details — not scored
Size32 MB19 MB
Age rating4+4+
DeveloperGokhan Behcet SahinARTIFICIAL INTELLIGENCE OPTIMIZATION AND SOFTWARE AIOS LLC

Customer experience

Perfect Structure

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

calc318

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

In-app purchases

1 purchases

Perfect Structure

One-time1
  • Perfect Structure Pro$8.99
2 purchases

calc318

Subscriptions2
  • calc318 Pro Monthly7 Days trial$2.991 Month
  • calc318 Pro Yearly7 Days trial$12.991 Year

Questions

Is Perfect Structure free?
Perfect Structure is free to download, with in-app purchases available.
Is calc318 free?
calc318 is free to download, with in-app purchases available.
Which has better reviews, Perfect Structure or calc318?
Perfect Structure and calc318 are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do Perfect Structure or calc318 have ads?
Perfect Structure shows ads; calc318 does not.
Which is updated more often, Perfect Structure or calc318?
Perfect Structure ships an update every 2 days, and calc318 every 3 months. Most recently, Perfect Structure was updated on October 11, 2026 and calc318 on October 1, 2026.

Other comparisons