Comparison

iEngineer vs Flange Bolt Size & Torque

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

Flange Bolt Size & Torque

Instantly access flange, pipe, and bolt data offline. Quickly find bolt sizes, torque patterns, flange dimensions, and pipe specifications. Ideal for pipefitters and steamfitters needing rapid access to piping information.

Highlights
  • Offline data access
  • Instant data lookups
  • Flange bolting data
  • Flange dimensions data
  • Pipe data
  • Gasket data
  • Torque pattern images
Features
Read full description

Lookup flange, pipe, and bolt data in seconds with Flange Bolt Chart. All data is available offline, lookups are instantaneous. Here's just a sample of the available data. Flange bolting data: 1. Number of bolts 2. Diameter of bolts 3. Length of bolts 4. Wrench size 5. Torque pattern 6. Target torque Flange dimensions data: 1. Outside diameter of flange 2. Flange thickness 3. Diameter of bolt circle 4. Flange weight Pipe data: 1. Outside diameter 2. Wall thickness 3. Schedule 4. Weight 5. Weight with liquid Gasket data: 1. Gasket inside diameter 2. Gasket outside diameter 3. Spiral wound dimensions 4. Type R ring dimensions And many more fields. All values are calculated or sourced directly from official standards like ASME B16.5 "Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard". Looking up flange, pipe, and bolt data with Flange Bolt Chart is far faster and less error prone than searching through PDF charts and tables. The sole purpose of the tool is to make it as simple as possible for pipefitters, steamfitters, and others working in piping to look up piping information like flange bolt size and torque pattern. Is there a feature you'd like from Flange Bolt Chart that you don't see? Request it through the app and we'll do our best to add it to the development schedule. Features of the app: 1. Full offline capability: No internet connection necessary to use. All data is stored locally on your phone. (The app requires minimum storage space overall) 2. Instant data lookups. Just enter the necessary inputs (like nominal pipe size and flange class) and the app instantly populates the correct values for the flange, pipe, or bolt outputs you’re searching for. 3. Flange torque sequence images: Includes the full list of torque sequences in picture form, with the studs numbered. The information in this app covers, but is not limited to: (1) flanges with rating class designations 150, 300, 400, 600, 900, and 1500 in sizes NPS 1/2 through NPS 60 and flanges with rating class designation 2500 in sizes NPS 1/2 through NPS 12, with requirements given in U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units; (2) flanged fittings with rating class designation 150 and 300 in sizes NPS 1/2 through NPS 60, with requirements given in U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units; (3) flanged fittings with rating class designation 400, 600, 900, and 1500 in sizes NPS 1/2 through NPS 60 and flanged fittings with rating class designation 2500 in sizes NPS 1/2 through NPS 12 in U.S. Customary units. Covers 4 bolt to 60 bolt sequences. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

iEngineer4 screens
Flange Bolt Size & Torque4 screens

Verdict

The call

The clearest difference is update cadence: Flange Bolt Size & Torque at monthly against iEngineer's every 5 months. iEngineer's advantage is review sentiment (86% vs 64%) and iOS requirement (9.3 vs 15.1). On price, rating, ratings volume 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. iEngineer sells 1 one-off in-app purchase and Flange Bolt Size & Torque sells 2 in-app purchases, starting at $4.99 per 3 months. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for iEngineer against 4.6 for Flange Bolt Size & Torque. Both are backed by a comparable volume of ratings — 196 and 363 respectively. Written reviews are what separate them: 86% of iEngineer's written reviews are positive against 64% of Flange Bolt Size & Torque's.

UpkeepUpdate frequency

iEngineer ships an update every 5 months, Flange Bolt Size & Torque monthly. The most recent releases landed on September 4, 2026 and September 24, 2026 respectively.

Scorecard3 real differences · 7 level
iEngineer versus Flange Bolt Size & Torque: the parameters behind the verdict, then further details
ParameteriEngineerFlange Bolt Size & Torque
PriceFreeFree
Rating4.6 (196 ratings)4.6 (363 ratings)
Positive reviews85.5% of reviews — better63.6% of reviews
Number of ratings196363 — better
Update frequencyEvery 5 monthsMonthly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.3 — better15.1
Further details — not scored
Size27 MB31 MB
Age rating4+4+
DeveloperPerfectly Simple Apps LLCOpen Source Consulting LLC

Customer experience

iEngineer

All ratings196 ratings
Positive89.8%
Neutral4.1%
Negative6.1%
Written reviews159 reviews
Positive85.5%
Neutral6.3%
Negative8.2%

Flange Bolt Size & Torque

All ratings363 ratings
Positive89.5%
Neutral2.2%
Negative8.3%
Written reviews44 reviews
Positive63.6%
Neutral0.0%
Negative36.4%

User reviews

iEngineer

From 196 App Store ratings

What we love

  • 🚀 Easy to navigate
  • 👍 Comprehensive information
  • 🔧 Useful for everyday work
  • ⚙️ Essential for engineers and machinists
  • 💡 Saves time compared to physical references

Room to improve

  • 🐛 Occasional errors in torque and tensile strength data
  • 💰 Metric information requires paid upgrade
  • 🔍 Missing some thread types like NPT and BSPP

Flange Bolt Size & Torque

From 363 App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Huge time saver
  • ✅ Reliable data
  • 🛠️ Very helpful tool
  • 💡 Useful for trade/craft

Room to improve

  • 💸 Now charges for features
  • 👎 Used to be better
  • 📉 Functionality decreased after redesign
  • ❌ Missing Code 61/62 flange info
  • 💰 Subscription model disliked

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

Flange Bolt Size & Torque

Reported bugs

6 issues
  • App stopped working, requires resubscription
  • App will not open after latest update
  • App is broken
  • Black screen and grey bar in the middle
  • Wrench sizes don't match up on some flanges
Show 1 more
  • Torque patterns on some flanges are off

Requested features

7 requests
  • Add Code 61/62 flange information
  • Include machined bolt sizes
  • Add torquing equipment info (rad guns, J gun, etc.) and usage instructions
  • Include CGI and CG torque specs for different gasket styles
  • Add support for larger flange sizes (beyond 60")
Show 2 more
  • Add RTJ selection
  • Availability on Windows tablet

In-app purchases

1 purchases

iEngineer

One-time1
  • Metric Screws$1.99
2 purchases

Flange Bolt Size & Torque

Subscriptions1
  • Flange Bolt Professional$4.993 Months
One-time1
  • Suggested Torque$0.99

Questions

Is iEngineer free?
iEngineer is free to download, with in-app purchases available.
Is Flange Bolt Size & Torque free?
Flange Bolt Size & Torque is free to download, with in-app purchases available.
Which has better reviews, iEngineer or Flange Bolt Size & Torque?
iEngineer and Flange Bolt Size & Torque are both rated 4.6 out of 5 on the App Store, from 196 and 363 ratings respectively.
Do iEngineer or Flange Bolt Size & Torque have ads?
Neither iEngineer nor Flange Bolt Size & Torque shows ads.
Which is updated more often, iEngineer or Flange Bolt Size & Torque?
iEngineer ships an update every 5 months, and Flange Bolt Size & Torque monthly. Most recently, iEngineer was updated on September 4, 2026 and Flange Bolt Size & Torque on September 24, 2026.

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