Comparison

Axize vs PipeDN

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

Head to head
About

Axize

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Calculating accumulator sizes using the conventional gas law for isothermal and adiabatic expansion of nitrogen gas gives inaccurate numbers at high pressure. This app takes advantage of work published in the Journal of Physical and Chemical Reference Data to perform accumulator sizing calculations with very high accuracy, for both isothermal and adiabatic conditions, expansion and contraction.

About

PipeDN

Features
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Need to determine the pipe size for a new industrial project? Want to check the maximum recommended flow rate for an existing fluid line? PipeDN is the ultimate pocket tool for industry professionals. Quickly find the ideal Nominal Diameter (DN) or maximum operating flow rate using velocity limits based on practical, field-tested engineering standards. Beyond delivering the exact requirement, the app generates a smart reference table of neighboring commercial pipe sizes (larger and smaller). This gives you the comprehensive technical data to choose the best design alternative for your facility. Highlighted Features: โ€ข Calculation Modules: "Find Ideal DN" and "Find Max Flow". โ€ข Native support for multiple pipe materials and schedules. โ€ข Professional PDF Reports: Export a detailed calculation memory directly to PDF. Include specific pipeline TAGs for customized, ready-to-archive engineering results. โ€ข Custom Units: Fully adapt pressure, temperature, flow rate, and diameter unit sets to match your region's standard. โ€ข Embedded Physical Tables: The Steam module features built-in thermodynamic properties for precise dynamic density tracking. Supported Fluids & Applications: โ€ข Water & Condensate: Treated Water, Condensate (Pump Discharge, Pump Suction, Steam Trap Return). โ€ข Steam: Advanced sizing targeting Saturated Steam and Superheated Steam lines. โ€ข Process Gases: Combustion Air, Flammable & Non-Flammable Gases, Nโ‚‚, Oโ‚‚, LPG. โ€ข Compressed Air: Limits tailored for Main Lines and Secondary Branches. โ€ข Vacuum Systems (Manifolds, Separators, Blowers). โ€ข Pulp & Paper Industry Niche: Exclusive calculation module for Cellulose Pulp responding to various consistency levels (up to 6%), as well as comprehensive chemical recovery liquors (Black Liquor in 4 concentrations, Green Liquor, Lime Mud, Dregs, Filtrate, Alkalis, and Tall Oil Soap). โ€ข Common Chemicals: Sodium Hydroxide, Sulphuric Acid, Antifoams, and Lubricating Oils. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Axize2 screens
PipeDN4 screens

Verdict

The call

The clearest difference is price: PipeDN at Free against Axize's $4.99. PipeDN also leads on update cadence (every 3 weeks vs every 5 months) and device support (3 vs 1). Axize's advantage is in-app purchases (none vs 3). On ads there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

PipeDN is free to download; Axize costs $4.99 up front. PipeDN sells 3 in-app purchases, starting at $4.99 per year. Axize asks for nothing beyond the download.

UpkeepUpdate frequency

Axize ships an update every 5 months, PipeDN every 3 weeks. The most recent releases landed on October 25, 2026 and October 23, 2026 respectively.

Scorecard5 real differences ยท 1 level
Axize versus PipeDN: the parameters behind the verdict, then further details
ParameterAxizePipeDN
Price$4.99Free โ€” better
Update frequencyEvery 5 monthsEvery 3 weeks โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhoneiPhone, iPad, iPod โ€” better
Requires iOS17.015.1 โ€” better
Further details โ€” not scored
Size1 MB40 MB
Age rating4+4+
DeveloperMetrakol, LLCAQUILES DE LIMA

In-app purchases

None

Axize

No in-app purchases

3 purchases

PipeDN

Subscriptions2
  • PipeDN Pro$4.991 Year
  • PipeDN Pro$7.991 Month
One-time1
  • PipeDN Pro$79.99

Questions

Is Axize free?
Axize costs $4.99, with no in-app purchases.
Is PipeDN free?
PipeDN is free to download, with in-app purchases available.
Do Axize or PipeDN have ads?
Neither Axize nor PipeDN shows ads.
Which is updated more often, Axize or PipeDN?
Axize ships an update every 5 months, and PipeDN every 3 weeks. Most recently, Axize was updated on October 25, 2026 and PipeDN on October 23, 2026.

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