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.
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.
- 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
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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.
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.
- Offline functionality
- Over 30,000 unit conversions
- 160+ currencies with live rates
- Save favorite conversions
- Answers in fractions
- Up to 5 decimal places
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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
Verdict
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
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.
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.
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.
| Parameter | Drill and Tap Tool | Metric Conversion tool |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.3 (30 ratings) | 4.8 (15K ratings) — better |
| Positive reviews | 73.2% of reviews — better | 69.2% of reviews |
| Number of ratings | 30 | 15K — better |
| Update frequency | Every 6 weeks | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 3 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Chewy Applications | Wight Hat |
Customer experience
Drill and Tap Tool
Metric Conversion tool
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
Drill and Tap Tool
No in-app purchases
Metric Conversion tool
No in-app purchases







