Comparison

Drill and Tap Tool vs Metric Conversion tool

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

Head to head
About

Drill and Tap Tool

Calculate the correct drill bit size for your tapping operations. Supports various thread types and inch/metric measurements. Provides precise calculations for depth of thread and clearance.

Highlights
  • Metric and US Standard tap/drill support
  • Spinning dial interface for easy selection
  • Calculates drill size for tapping
  • Supports various thread types (UNC, UNF, NPT, BSP, etc.)
  • Provides drill sizes in Metric, Inch, and US No./Letter
  • Calculates percentage depth of thread
  • Calculates through-hole clearance
Features
Read full description

iOS 10 compatible! Whether you use Metric taps and drills, US Standard taps and inch drills, or any combination of size types, this app has the answers. No typing required; just tap your thread type and spin the dials to find the correct size of drill for your thread tapping operation. The interface allows for selection of the following variables to calculate your required drill size: • Thread Type, • Tap Size, • Percentage Depth of Thread, • Through Hole Clearance, • Cutting or Forming Operation The closest drill bits are given in Metric, Fractional Inch, and US No. / Letter sizes, making this the perfect tool for those using a mix of tap and drill types. The app ensures complete control and accuracy of your operations by recalculating the actual percentage-depth-of-thread and through-hole clearance for each closest drill bit size. Thread types include: • US Standard UNC, UNF, UNEF • ISO Metric coarse, fine • National Pipe Thread - Tapered (NPT) • National Pipe Thread - Straight (NPS/NPP) • British Pipe Standard Thread - BSP (Parallel - G) • British Pipe Standard Tapered Thread - BSPT (Parallel - R / Rp) A helpful reference tool for engineers, machinists, trades-men, students, tool makers, DIYers, fitters and turners, and fabricators, etc.

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!

Screenshots

Drill and Tap Tool4 screens
Metric Conversion tool4 screens

Verdict

The call

The clearest difference is price: Metric Conversion tool at Free against Drill and Tap Tool's $1.99. Metric Conversion tool also leads on rating (4.8 vs 4.3) and ratings volume (15K vs 30). Drill and Tap Tool's advantage is ads (none vs shown) and iOS requirement (9.0 vs 15.1). On review sentiment, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Metric Conversion tool is free to download; Drill and Tap Tool costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Metric Conversion tool holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: Metric Conversion tool has 15K ratings behind it against 30, so its average is the more settled of the two. Written reviews complicate that: 73% of Drill and Tap Tool's written reviews are positive against 69% of Metric Conversion tool's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Drill and Tap Tool ships an update every 6 weeks, Metric Conversion tool fortnightly. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

Scorecard7 real differences · 3 level
Drill and Tap Tool versus Metric Conversion tool: the parameters behind the verdict, then further details
ParameterDrill and Tap ToolMetric Conversion tool
Price$1.99Free — better
Rating4.3 (30 ratings)4.8 (15K ratings) — better
Positive reviews73.2% of reviews — better69.2% of reviews
Number of ratings3015K — better
Update frequencyEvery 6 weeksFortnightly — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS9.0 — better15.1
Further details — not scored
Size3 MB57 MB
Age rating4+4+
DeveloperChewy ApplicationsWight Hat

Customer experience

Drill and Tap Tool

All ratings30 ratings
Positive83.3%
Neutral3.3%
Negative13.3%
Written reviews41 reviews
Positive73.2%
Neutral7.3%
Negative19.5%

Metric Conversion tool

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

Bugs and requests

Drill and Tap Tool

Not enough reviews yet to summarise bugs or 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.)

In-app purchases

None

Drill and Tap Tool

No in-app purchases

None

Metric Conversion tool

No in-app purchases

Questions

Is Drill and Tap Tool free?
Drill and Tap Tool costs $1.99, with no in-app purchases.
Is Metric Conversion tool free?
Metric Conversion tool is free to download, with no in-app purchases.
Which has better reviews, Drill and Tap Tool or Metric Conversion tool?
Metric Conversion tool is rated higher. Drill and Tap Tool averages 4.3 out of 5 from 30 ratings, while Metric Conversion tool averages 4.8 from 15K ratings.
Do Drill and Tap Tool or Metric Conversion tool have ads?
Metric Conversion tool shows ads; Drill and Tap Tool does not.
Which is updated more often, Drill and Tap Tool or Metric Conversion tool?
Drill and Tap Tool ships an update every 6 weeks, and Metric Conversion tool fortnightly. Most recently, Drill and Tap Tool was updated on October 26, 2026 and Metric Conversion tool on October 28, 2026.

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