Comparison

FlowLine Isometric vs Pipe Calc

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

Head to head
About

FlowLine Isometric

A professional tool for creating isometric piping diagrams. It allows pipefitters, plumbers, engineers, and contractors to quickly sketch and document pipe runs with a snap grid for precise isometric projection.

Highlights
  • Isometric projection drawing
  • Snap grid for precise lines
  • Quick sketching and documentation
  • On-site or office use
  • Focus on layout
Features
Read full description

Flowline is a professional isometric piping diagram tool built for pipefitters, plumbers, mechanical engineers, and contractors who need to sketch and document pipe runs quickly on site or in the office. Draw in true isometric projection with a snap grid that keeps every line on axis. Flowline handles the geometry so you can focus on the layout.

About

Pipe Calc

Features
Read full description

Pipe Calc is an offset calculator built for pipefitters, plumbers, and steamfitters. Simple offsets, rolling offsets, cut length with fitting takeouts, and slope - in feet, inches, and fractions, the way your tape reads. No ads. - Simple offsets with any fitting angle (45, 22.5, 60, custom) - Rolling offsets: true offset, travel, and roll angle - Cut length with takeout charts for standard fittings - Slope / grade calculations - Reference Data: offline ASME pipe schedules & weights, fitting takeouts, flanges, gaskets, valves, line blanks - Fraction-first input and results to 1/16" - Big, glove-friendly controls Made for plumbing, steamfitting, sprinkler fitting and welding layout work. PIPE CALC PRO Offset with 45° fittings, Takeout Charts, Reference Data and your five newest saved calculations are free. Pro unlocks rolling, parallel and compound offsets, cut length with butt-weld and threaded takeouts, slope, laterals, branch saddle and miter cut templates, the triangle solver, flange bolt-up torque, all fitting angles and your full calculation history. Choose a monthly or yearly subscription, or a one-time lifetime option. The three lifetime options unlock the same Pro features; only the support amount differs. Prices are shown in the app before you buy. Subscriptions are charged to your Apple ID and renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in your App Store account settings. If you bought Pro before, it stays unlocked: use Restore purchases. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://cleverlywittyapps.notion.site/Privacy-Policy-398c2350884981939ed5fda1e5335369 Support: cleverlywittyapps@gmail.com

Screenshots

FlowLine Isometric4 screens
Pipe Calc4 screens

Verdict

The call

The clearest difference is in-app purchases: FlowLine Isometric at none against Pipe Calc's 5. Pipe Calc's advantage is update cadence (every 5 days vs every 6 weeks) and iOS requirement (15.0 vs 26.0). On price, ads 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

Both are free to download. Pipe Calc sells 5 in-app purchases, starting at $2.99 per month. FlowLine Isometric asks for nothing beyond the download.

UpkeepUpdate frequency

FlowLine Isometric ships an update every 6 weeks, Pipe Calc every 5 days. The most recent releases landed on November 9, 2026 and November 10, 2026 respectively.

Scorecard3 real differences · 6 level
FlowLine Isometric versus Pipe Calc: the parameters behind the verdict, then further details
ParameterFlowLine IsometricPipe Calc
PriceFreeFree
Rating4.0 (12 ratings) — better—
Number of ratings12 — better—
Update frequencyEvery 6 weeksEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.015.0 — better
Further details — not scored
Size23 MB29 MB
Age rating4+4+
DeveloperJoshua ParkinGun woo Kim

In-app purchases

None

FlowLine Isometric

No in-app purchases

5 purchases

Pipe Calc

Subscriptions2
  • Pro Monthly$2.991 Month
  • Pro Yearly$24.991 Year
One-time3
  • Lifetime Pro · Supporter I$29.99
  • Lifetime Pro · Supporter II$39.99
  • Lifetime Pro · Supporter III$59.99

Questions

Is FlowLine Isometric free?
FlowLine Isometric is free to download, with no in-app purchases.
Is Pipe Calc free?
Pipe Calc is free to download, with in-app purchases available.
Do FlowLine Isometric or Pipe Calc have ads?
Neither FlowLine Isometric nor Pipe Calc shows ads.
Which is updated more often, FlowLine Isometric or Pipe Calc?
FlowLine Isometric ships an update every 6 weeks, and Pipe Calc every 5 days. Most recently, FlowLine Isometric was updated on November 9, 2026 and Pipe Calc on November 10, 2026.

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