Metric Conversion tool vs Electrician Handbook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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!
Electrician Handbook
This app provides electricians, students, and installers with essential electrical theory, interactive diagrams, and practical calculators. It includes a community forum for users to share knowledge and seek advice, all accessible offline without ads or subscriptions.
- Electrical theory topics
- Interactive circuit diagrams
- Calculators and formulas
- Community forum
- Offline access
- No ads or subscriptions
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Electrician’s Handbook — an app for electricians, students, and installers. Theory, diagrams, and calculators in one place. Works offline. No ads. No subscriptions. — Theory A variety of topics in electrical engineering: from basic concepts to grounding and lighting diagrams. Some topics include exercises with answers for self-check. — Diagrams Interactive electrical diagrams. You can interact with elements to better understand how they work. — Calculators A section with calculators, formulas, and useful reference tables. — Community A section where users can ask questions, share experience, and get advice from other members. — Contents of the "Theory" section: Basic concepts • Voltage, current, resistance, power • Ohm’s Law, Kirchhoff’s rules • Parallel and series connections • Short circuits, safety precautions • Electrical engineering terms Electromechanical converters • Transformer, generator, electric motor • Connecting a three-phase motor using a capacitor Protection and automation devices • Circuit breaker, RCD, RCBO • Voltage monitoring relay, contactor, fuses • Surge protection devices Cables and wires • Wire connection methods • Selecting cross-section by current and power • Color coding • Electrical panel Power stations and substations • Nuclear, thermal, solar, hydro, wind, and geothermal power stations Measuring instruments • Voltmeter, ammeter, ohmmeter, multimeter • Clamp meter • Electricity meter Grounding • Types of grounding systems • Equipotential bonding system Lighting • Incandescent, LED, and other types of lamps • Lamp holders, bases, lumens, lux • Color temperature • LED strip Work execution • Socket repair • Installation of flush-mounted and surface-mounted sockets • Switch installation Additional information • Power supply categories • Surge overvoltages • IP protection rating • Electrician’s tools • Types of outlets and plugs, voltages in different countries • Joule’s Law, Coulomb’s Law • Right-hand and left-hand rules — Contents of the "Diagrams" section: • Switch (1 and 2 gang) • Three-gang switch • Two-way switch • Two-way switch with intermediate switch • Outlets and switch in one block • Lighting with dimmer • Motion sensor lighting • Relay with light sensor • Lighting with impulse relay • Fluorescent lamp wiring • Socket wiring diagrams • Magnetic starter for motor • Star and delta motor connection — Contents of the "Calculators" section: • Basic formula calculator • Electricity cost calculator • SI unit system and metric prefixes • Diameter ↔ cross-section table • AWG to mm and mm to AWG conversion • Electronic component symbols
Screenshots
Verdict
The clearest difference is in-app purchases: Metric Conversion tool at none against Electrician Handbook's 1. Metric Conversion tool also leads on ratings volume (15K vs 1K). Electrician Handbook's advantage is ads (none vs shown) and review sentiment (79% vs 69%). On price, rating, update cadence and monetization model 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. Electrician Handbook sells 1 one-off in-app purchase. Metric Conversion tool asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.8 for Metric Conversion tool against 4.8 for Electrician Handbook. That said, the two scores are not equally well evidenced: Metric Conversion tool has 15K ratings behind it against 1K, so its average is the more settled of the two. Written reviews are what separate them: 69% of Metric Conversion tool's written reviews are positive against 79% of Electrician Handbook's.
Metric Conversion tool ships an update fortnightly, Electrician Handbook every 2 weeks. The most recent releases landed on November 4, 2026 and November 3, 2026 respectively.
| Parameter | Metric Conversion tool | Electrician Handbook |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (15K ratings) — better | 4.8 (1K ratings) |
| Positive reviews | 69.2% of reviews | 78.6% of reviews — better |
| Number of ratings | 15K — better | 1K |
| Update frequency | Fortnightly | Every 2 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 16.0 |
| Further details — not scored | ||
| Size | 57 MB | 61 MB |
| Age rating | 4+ | 4+ |
| Developer | Wight Hat | Sergey Vavaev |
Customer experience
Metric Conversion tool
Electrician Handbook
User reviews
Metric Conversion tool
From 15K App Store ratingsWhat 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
Electrician Handbook
From 1K App Store ratingsWhat we love
- 👍 Informative and useful
- 🚀 Comprehensive and interactive
- 💡 Helpful for beginners and professionals
- 🔍 Detailed diagrams and visuals
- 🤖 Intuitive and easy to use
Room to improve
- 🐛 Occasional crashes and bugs
- 💰 Ads can be intrusive
- 🕰️ Some content may be outdated
- 🌍 Limited language support
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.)
Electrician Handbook
Reported bugs
3 issues- App not launching on certain devices
- Calculation errors in some modules
- Inconsistent UI behavior across platforms
Requested features
4 requests- More practical examples and tutorials
- Ability to save and export diagrams
- Inclusion of industry standards and regulations
- Integration of testing and simulation tools
In-app purchases
Metric Conversion tool
No in-app purchases
Electrician Handbook
- Unlock all features in app$6.99





