Comparison

MEP Calc vs DuctSizer Pro

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

Head to head
About

MEP Calc

Features
Read full description

MEP Calc brings mechanical installation calculations and reference tools together for HVAC and fire protection engineers. CALCULATION TOOLS Fire Protection • Sprinkler selection using supported NFPA 13, EN 12845 and FM Global criteria • Compare available sprinkler alternatives and use the selected option in the system overview and PDF report • Fire pump equipment sizing, NPSH, clean agent and foam calculations • Dry system compressor, test and drain valve tools • Sprinkler, fire protection and installation reference tables Heating and Cooling • Pipe sizing, circulation pumps and pump head • Expansion tanks, radiators and underfloor heating • Collectors, balance tanks, buffer tanks and cooling towers • Pipe volume and insulation calculations Ventilation and Air Conditioning • Duct sizing and pressure loss • Air handling and psychrometric calculations • Fan and diffuser tools • Pool dehumidification Plumbing, Natural Gas, Compressed Air and Steam • Cold water, wastewater, hot water and booster pump calculations • Gas pipe sizing, pressure drop, regulators and meters • Compressed air pipes, compressors and air receivers • Steam and condensate pipes, boilers and steam traps KEY FEATURES • Five languages: English, Turkish, Arabic, French and Spanish • SI and IP unit systems • Calculation results and reference data in one app • PDF reports for saving and sharing results with Pro • Unit converter and favorites for frequently used tools • iPhone and iPad support • Calculations work offline; purchasing, restoring and refreshing subscription access require an internet connection PRO ACCESS Free tools are available alongside Pro modules. Crown-marked calculations and selected reference tools across multiple categories require an active Pro subscription. PDF export and sharing also require Pro. Not every tool outside the fire protection category is free. MEP Calc currently offers a yearly auto-renewable Pro subscription. New subscriptions have no free trial in any country. The local price and purchase terms are shown before confirmation. Restore Purchases is available in the app. Payment is charged to your Apple Account upon purchase confirmation. The subscription automatically renews unless cancelled at least 24 hours before the end of the current period. Manage or cancel it in your Apple Account subscription settings. ENGINEERING USE Results depend on the entered data, supported calculation methods and stated limits. These tools assist engineering work; they do not replace project-specific hydraulic design, product listings, applicable local requirements or review by a qualified professional. Privacy Policy: https://fatihselvi1905-bit.github.io/mekaniktesisat-privacy-en/ Terms of Use: https://fatihselvi1905-bit.github.io/mekaniktesisat-terms-en/

About

DuctSizer Pro

This tool quickly calculates HVAC duct sizes based on airflow and friction loss. It supports various duct shapes and provides key airflow values for field use.

Highlights
  • Calculate CFM from duct size
  • Find duct sizes from CFM
  • Supports square, round, and oval duct
  • Shows velocity, friction, area, and equivalent round size
  • Highlights suggested duct sizes
  • Compares alternate duct sizes
Features
Read full description

DuctSizer Pro is a fast HVAC duct sizing calculator built for field use. Enter duct dimensions and friction to calculate CFM, or enter CFM and friction to find suggested duct sizes. The app supports square, round, and oval ductwork and shows key airflow values such as velocity, friction, area, and equivalent round size. Features: - Calculate CFM from duct size - Find duct sizes from CFM - Supports square, round, and oval duct - Shows velocity, friction, area, and equivalent round size - Highlights suggested duct sizes - Compares alternate duct sizes for the same airflow DuctSizer Pro is designed as a quick reference tool for HVAC layout, estimating, and field calculations.

Screenshots

MEP Calc4 screens
DuctSizer Pro4 screens

Verdict

The call

MEP Calc and DuctSizer Pro are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. MEP Calc sells 5 in-app purchases, starting at $6.99 per month and DuctSizer Pro sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

MEP Calc ships an update every 5 days, DuctSizer Pro weekly. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

ScorecardNo meaningful differences
MEP Calc versus DuctSizer Pro: the parameters behind the verdict, then further details
ParameterMEP CalcDuctSizer Pro
PriceFreeFree
Rating—5.0 (3 ratings) — better
Number of ratings—3 — better
Update frequencyEvery 5 days — betterWeekly
AdsNoNo
In-app purchasesYesYes
Monetization—Free
DevicesiPhone, iPad — betteriPhone
Requires iOS17.0 — better17.6
Further details — not scored
Size30 MB5 MB
Age rating4+4+
DeveloperAhmet SelviLEONARDO NOVOA

In-app purchases

5 purchases

MEP Calc

Subscriptions4
  • Pro Monthly - Intro Support$6.991 Month
  • MEP Calc Pro (Monthly)$12.991 Month
  • Pro Yearly - Intro Support$24.991 Year
Show 1 more
  • MEP Calc Pro (Yearly)$29.991 Year
One-time1
  • MEP Calc Pro Lifetime$69.99
1 purchases

DuctSizer Pro

One-time1
  • Catalog Pro$2.99

Questions

Is MEP Calc free?
MEP Calc is free to download, with in-app purchases available.
Is DuctSizer Pro free?
DuctSizer Pro is free to download, with in-app purchases available.
Do MEP Calc or DuctSizer Pro have ads?
Neither MEP Calc nor DuctSizer Pro shows ads.
Which is updated more often, MEP Calc or DuctSizer Pro?
MEP Calc ships an update every 5 days, and DuctSizer Pro weekly. Most recently, MEP Calc was updated on October 28, 2026 and DuctSizer Pro on October 24, 2026.

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