iEngineer vs Tube Turns
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iEngineer
Access a vast database of screw and bolt information, including dimensions, material grades, and strength properties for both US and metric fasteners. Features a comprehensive drill chart, unit conversion, and customizable material displays.
- Extensive US screw database
- Metric screw database (in-app purchase)
- Detailed dimensions and material grades
- Strength, torque, and clamp force data
- Head markings and 3D head models
- Comprehensive drill chart
- Unit conversion and data export
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iEngineer is the most comprehensive database of screw/bolt information that you can find anywhere. US screws: -93 different screws from #0 to 4” -Dimensions for 9 standard head styles -74 material grades including SAE, ASTM, and other materials Metric Screws (available as in-app purchase): -210 different metric screws from M1.0 to M100 -Dimensions for 10 standard head styles for ISO, DIN, BS, and ANSI standards where available -86 material grades including 12 additional metric grades, SAE, ASTM, and other materials Displayed values for both the US and Metric screws include: -Standard dimensions -Tap sizes -Clearance hole sizes -Material strength -Recommended torque values -Clamp force -Shear force -Head markings display -3D model of head type -Standard dimensions of head type Other features: -Drill chart with 523 drill bit sizes -Fraction chart -Copy and paste data values -Fast and easy unit conversion -Ability to show/hide material grades in the interface so you only see what is relevant to you If you have any questions please contact us at support@perfectlysimpleapps.com
Tube Turns
A mobile reference guide for pipe fitting, welding, and industrial piping. It provides instant access to essential formulas, conversion tables, technical specifications, and industry standards for professionals in the oil & gas and petrochemical sectors.
- Technical reference library
- Formulas and conversion tools
- Welding specifications
- Material properties database
- Searchable glossary
- Offline functionality
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Pipe Fitters Manual by Sypris Technologies Your comprehensive mobile reference for pipe fitting, welding, and industrial piping. Access essential formulas, conversion tables, technical specifications, and industry standards instantly. Perfect for pipe fitters, welders, engineers, and technicians working in oil & gas, petrochemical, and processing industries. Key Features: - Complete technical reference library - Formulas and conversion tools - Welding specifications - Material properties database - Product literature and IOM guides - Searchable glossary - Works offline Brought to you by Tube Turns, serving industrial piping since 1927.
Screenshots
Verdict
iEngineer and Tube Turns both sit at 4.6 stars, but that hides the real split: 86% of iEngineer's written reviews are positive against 33% of Tube Turns's. iEngineer also leads on ratings volume (200 vs 4). Tube Turns's advantage is in-app purchases (none vs 1) and iOS requirement (18.6 vs 26.0). On price, rating, update cadence and ads 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
Both are free to download. iEngineer sells 1 one-off in-app purchase. Tube Turns asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.6 for iEngineer against 4.5 for Tube Turns. That said, the two scores are not equally well evidenced: iEngineer has 200 ratings behind it against 4, so its average is the more settled of the two. Written reviews are what separate them: 86% of iEngineer's written reviews are positive against 33% of Tube Turns's.
iEngineer ships an update every 5 months, Tube Turns every 4 months. The most recent releases landed on October 29, 2026 and October 11, 2026 respectively.
| Parameter | iEngineer | Tube Turns |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (200 ratings) — better | 4.5 (4 ratings) |
| Positive reviews | 85.5% of reviews — better | 33.3% of reviews |
| Number of ratings | 200 — better | 4 |
| Update frequency | Every 5 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 18.6 — better |
| Further details — not scored | ||
| Size | 12 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Perfectly Simple Apps LLC | Aaron McCarthy |
Customer experience
iEngineer
Tube Turns
Bugs and requests
iEngineer
Reported bugs
2 issues- Metric portion not working for some users
- Camera access request for no apparent reason
Requested features
4 requests- Add tap drill chart
- Include clearance hole fits
- Improve UI for larger displays
- Add French language support
Tube Turns
Not enough reviews yet to summarise bugs or requests.
In-app purchases
iEngineer
- Metric Screws$1.99
Tube Turns
No in-app purchases
Questions
Is iEngineer free?
Is Tube Turns free?
Which has better reviews, iEngineer or Tube Turns?
Do iEngineer or Tube Turns have ads?
Which is updated more often, iEngineer or Tube Turns?
Other comparisons
