iEngineer vs Virtual Flange Slide Rule
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
Virtual Flange Slide Rule
Access essential measurements and dimensional data for API 6A integral flanges. This tool provides quick access to critical specifications for engineering and industrial applications.
- API 6A integral flange data
- Relevant measurements
- Dimensional data access
- Engineering specifications
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Valveworks USA presents the Virtual Flange Slide Rule. This application gives you access to all the relevant measurements and dimensional data for the API 6A integral flange.
Screenshots
Verdict
The clearest difference is in-app purchases: Virtual Flange Slide Rule at none against iEngineer's 1. Virtual Flange Slide Rule also leads on rating (5.0 vs 4.5) and review sentiment (100% vs 86%). iEngineer's advantage is ratings volume (201 vs 13). On price, update cadence, 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
Both are free to download. iEngineer sells 1 one-off in-app purchase. Virtual Flange Slide Rule asks for nothing beyond the download.
Virtual Flange Slide Rule holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: iEngineer has 201 ratings behind it against 13, so its average is the more settled of the two. Written reviews point the same way: 86% of iEngineer's written reviews are positive against 100% of Virtual Flange Slide Rule's.
iEngineer ships an update every 5 months, Virtual Flange Slide Rule every 4 months. Both last shipped on November 1, 2026.
| Parameter | iEngineer | Virtual Flange Slide Rule |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (201 ratings) | 5.0 (13 ratings) — better |
| Positive reviews | 85.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 201 — better | 13 |
| 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, iPod — better |
| Requires iOS | 26.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 12 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Perfectly Simple Apps LLC | American Certified Equipment, Inc. |
Customer experience
iEngineer
Virtual Flange Slide Rule
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
Virtual Flange Slide Rule
Not enough reviews yet to summarise bugs or requests.
In-app purchases
iEngineer
- Metric Screws$1.99
Virtual Flange Slide Rule
No in-app purchases
Questions
Is iEngineer free?
Is Virtual Flange Slide Rule free?
Which has better reviews, iEngineer or Virtual Flange Slide Rule?
Do iEngineer or Virtual Flange Slide Rule have ads?
Which is updated more often, iEngineer or Virtual Flange Slide Rule?
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