# Pipe Trades Pro Calc vs FlowLine Isometric

The clearest difference is rating: Pipe Trades Pro Calc at 4.8 against FlowLine Isometric's 4.0. Pipe Trades Pro Calc also leads on ratings volume (4.4K vs 11) and chart position (#175 vs unranked). FlowLine Isometric's advantage is in-app purchases (none vs 6) and update cadence (every 6 weeks vs every 7 months). On price, ads and device support there is nothing between them.

Both are free to download. Pipe Trades Pro Calc sells 2 in-app purchases, starting at $4.99 per month. FlowLine Isometric asks for nothing beyond the download.

Pipe Trades Pro Calc holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Pipe Trades Pro Calc has 4.4K ratings behind it against 11, so its average is the more settled of the two.

Pipe Trades Pro Calc ships an update every 7 months, FlowLine Isometric every 6 weeks. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Pipe Trades Pro Calc | FlowLine Isometric |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4.4K ratings)](https://appshunter.io/ios/app/pipe-trades-pro-calc/id596142100/reviews)** | [4.0 (11 ratings)](https://appshunter.io/ios/app/flowline-isometric/id6762237039/reviews) |
| Number of ratings | **4.4K** | 11 |
| Positive reviews | 42.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 6 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#175** | — |
| Size | 51 MB | 23 MB |
| Requires iOS | **14.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Calculated Industries](https://appshunter.io/developer/370406449) | [Joshua Parkin](https://appshunter.io/developer/1495725832) |

## What reviewers say

### Pipe Trades Pro Calc

[App page](https://appshunter.io/ios/app/pipe-trades-pro-calc/id596142100)

**Currently charting:** #175 Top Grossing · Utilities (US App Store)

This app provides advanced calculation tools and comprehensive data for pipe trade professionals. It streamlines workflows for pipefitters, welders, and steamfitters with features for measurements, fluid dynamics, and material specifications. Designed for efficiency and accuracy, it works offline for on-site use.

**Highlights:** Advanced measurement calculations, Fluid dynamics and pressure analysis, Comprehensive pipe data access, Offline functionality, User-centric interface, Material and dimension options

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Full Access | $4.99 | per month |
| 1 Year Full Access | $39.99 | per year |

**What reviewers like**

- 🔢 Useful calculator tool
- 🧠 Helpful for pipe fitters and welders
- 📱 Convenient to have on mobile device
- 🔍 Accurate calculations

**What reviewers complain about**

- 💰 Subscription model is too expensive
- 🔒 Requires internet connection to verify subscription
- 🔄 Used to be a one-time purchase
- 🤔 Confusing transition from one-time to subscription

**Reported bugs**

- App freezes or stops working after updates
- Calculation errors with fractions
- Issues with reinstalling or transferring purchases

**Requested features**

- Ability to use app without subscription
- Support for larger pipe sizes
- Add a back/undo button
- Rotate screen orientation


### FlowLine Isometric

[App page](https://appshunter.io/ios/app/flowline-isometric/id6762237039)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Pipe Trades Pro Calc free?

Pipe Trades Pro Calc is free to download, with in-app purchases available.

### Is FlowLine Isometric free?

FlowLine Isometric is free to download, with no in-app purchases.

### Which has better reviews, Pipe Trades Pro Calc or FlowLine Isometric?

Pipe Trades Pro Calc is rated higher. Pipe Trades Pro Calc averages 4.8 out of 5 from 4.4K ratings, while FlowLine Isometric averages 4.0 from 11 ratings.

### Do Pipe Trades Pro Calc or FlowLine Isometric have ads?

Neither Pipe Trades Pro Calc nor FlowLine Isometric shows ads.

### Which is updated more often, Pipe Trades Pro Calc or FlowLine Isometric?

Pipe Trades Pro Calc ships an update every 7 months, and FlowLine Isometric every 6 weeks. Most recently, Pipe Trades Pro Calc was updated on October 29, 2026 and FlowLine Isometric on October 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*