Comparison

Metric Conversion tool 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

Metric Conversion tool

This app provides a comprehensive unit and currency converter with a user-friendly interface. It offers offline functionality, supports over 30,000 unit conversions, and includes more than 160 currencies with live exchange rates. Users can save favorite conversions and get precise results.

Highlights
  • Offline functionality
  • Over 30,000 unit conversions
  • 160+ currencies with live rates
  • Save favorite conversions
  • Answers in fractions
  • Up to 5 decimal places
Features
Read full description

Unit converter App from the most popular metric conversions website in the world, metric-conversions.org. Over a billion visitors have used our website, try our app and see why we're so popular! FEATURES: Easy to use clear interface Works offline All popular unit conversions (over 30,000 of them) Over 160 currencies (including Bitcoin and other cryptocurrencies) with live exchange rates Store your favorite conversions for quick access Answers in fractions where needed. Obtain conversion results with up to 5 decimal places Imperial units split into other imperial units – so you can get a weight in stones and pounds, pounds and ounces, etc. Lengths break down into feet and inches, etc. WEIGHT: Kilograms, Pounds, Stones, Ounces, Grams, Carats, Grains, Hundredweights, Micrograms.Milligrams, Ounces, Pennyweights, Tons, Troy pounds, Troy ounces TEMPERATURE: Celsius, Fahrenheit, Kelvin, Rankine, Newton, Réaumur, Rømer, Delisle. LENGTH: Miles, Yards, Feet, Inches, Kilometers, Meters, Centimeters, Chains, Decimeters, Furlongs, Leagues, Lightyears, Microinches, Microns, Millimeters, Parsecs, Nautical Leagues, Nautical Miles. AREA: Square Miles, Acres, Square Yards, Square Feet, Square Inches, Square Kilometers, Hectares, Square Meters, Square Centimeters, Square Millimeters, Square Microns, Square Microinches. VOLUME: Cups, Tablespoons, Teaspoons, Gallons, Pints, Gills, Ounces , Cubic Meters, Liters, Centiliters, Milliliters, Cubic Yards, Barrels, Quarts, Gills. SPEED: Miles per hour, Kilometers per hour, Meters per second, Knots, Mach, Light speed and more. TIME: Seconds, Minutes, Hours, Days. ANGLE: Degrees, Radians, Minutes (Angular), Seconds (Angular), Centrad, Gradians, Milliradians, Sign PRESSURE: Atmospheres, Bar, Pascals, Pound Force per Square Inch, Inches of Mercury, Inches of Water, Kilogram Force per Square Meter, Millibar, Millimeters of Mercury, Millimeters of Water, Newtons per Meter Squared, Pounds per Square Foot, Torrs CURRENCY: All state sponsored world currencies as well as major crypto-currencies. If you need anything added, email us at appcontact@metric-conversions.org and we'll do our best to put them in for you!

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

Metric Conversion tool4 screens
Flange Bolt Size & Torque4 screens

Verdict

The call

The clearest difference is in-app purchases: Metric Conversion tool at none against Flange Bolt Size & Torque's 2. Metric Conversion tool also leads on ratings volume (15K vs 373) and rating (4.8 vs 4.6). Flange Bolt Size & Torque's advantage is ads (none vs shown). On price, review sentiment, device support and iOS requirement 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. Flange Bolt Size & Torque sells 2 in-app purchases, starting at $4.99 per 3 months. Metric Conversion tool asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Metric Conversion tool holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Metric Conversion tool has 15K ratings behind it against 373, so its average is the more settled of the two. Written reviews point the same way: 69% of Metric Conversion tool's written reviews are positive against 65% of Flange Bolt Size & Torque's.

UpkeepUpdate frequency

Metric Conversion tool ships an update fortnightly, Flange Bolt Size & Torque monthly. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

Scorecard6 real differences · 4 level
Metric Conversion tool versus Flange Bolt Size & Torque: the parameters behind the verdict, then further details
ParameterMetric Conversion toolFlange Bolt Size & Torque
PriceFreeFree
Rating4.8 (15K ratings) — better4.6 (373 ratings)
Positive reviews69.2% of reviews — better65.2% of reviews
Number of ratings15K — better373
Update frequencyFortnightly — betterMonthly
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.1
Further details — not scored
Size57 MB31 MB
Age rating4+4+
DeveloperWight HatOpen Source Consulting LLC

Customer experience

Metric Conversion tool

All ratings14,631 ratings
Positive96.5%
Neutral2.1%
Negative1.4%
Written reviews201 reviews
Positive69.2%
Neutral5.0%
Negative25.9%

Flange Bolt Size & Torque

All ratings363 ratings
Positive89.5%
Neutral2.2%
Negative8.3%
Written reviews46 reviews
Positive65.2%
Neutral0.0%
Negative34.8%

User reviews

Metric Conversion tool

From 15K App Store ratings

What we love

  • 💡 Useful conversion tool
  • 👍 Easy to use and navigate
  • 🚀 Quick and efficient
  • 👍 Comprehensive coverage of conversions

Room to improve

  • 🔊 Intrusive and loud ads
  • 🔒 Questionable privacy practices
  • 🐛 Inaccurate conversions
  • 👎 Disruptive to workflow

Flange Bolt Size & Torque

From 373 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

Metric Conversion tool

Reported bugs

2 issues
  • Temperature conversion displaying incorrect values
  • Ads triggering false memory full warnings

Requested features

3 requests
  • Paid version to remove ads
  • Option to display results in preferred format
  • Speed conversion (mph, km/h, etc.)

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

None

Metric Conversion tool

No in-app purchases

2 purchases

Flange Bolt Size & Torque

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

Questions

Is Metric Conversion tool free?
Metric Conversion tool is free to download, with no in-app purchases.
Is Flange Bolt Size & Torque free?
Flange Bolt Size & Torque is free to download, with in-app purchases available.
Which has better reviews, Metric Conversion tool or Flange Bolt Size & Torque?
Metric Conversion tool is rated higher. Metric Conversion tool averages 4.8 out of 5 from 15K ratings, while Flange Bolt Size & Torque averages 4.6 from 373 ratings.
Do Metric Conversion tool or Flange Bolt Size & Torque have ads?
Metric Conversion tool shows ads; Flange Bolt Size & Torque does not.
Which is updated more often, Metric Conversion tool or Flange Bolt Size & Torque?
Metric Conversion tool ships an update fortnightly, and Flange Bolt Size & Torque monthly. Most recently, Metric Conversion tool was updated on October 30, 2026 and Flange Bolt Size & Torque on October 24, 2026.

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