Resistor Tools vs Unit Converter & Tools
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Resistor Tools
This utility app provides a suite of tools for calculating and determining resistor values. It assists hobbyists and engineers with series, parallel, and voltage divider calculations, as well as inverting amplifier gain.
- Series and parallel resistor calculation
- Resistor combination finder
- Voltage divider ratio and value calculation
- Inverting amplifier gain calculation
- Save combinations to CSV
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This app is a collection of resistor calculators. It is suitable for hobbyist or electronic engineer. * Calculate resistance of two resistors in series or parallel * Find out combinations of two resistors in series/parallel making a desired resistance * Calculate ratio of R1/R2 and voltage divider * Find out resistor values of making voltage divider ratio * Find out resistor values of making inverting amplifier gain * Save combination values in CSV file
Unit Converter & Tools
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Unit Converter: Smart Tools Convert units. Measure precisely. Use your phone as a smart toolkit. Unit Converter: Smart Tools is a powerful all-in-one utility app that helps you convert units instantly and turn your device into a real-world measurement tool using built-in sensors. Designed for students, engineers, builders, travelers, and professionals who need fast, accurate results — anytime, anywhere. Advanced Unit Converter & Calculator Convert units quickly across a wide range of categories: • Length, Area, Volume, Weight • Temperature, Speed, Pressure • Energy, Power, Force • Data & digital storage • Time & time zones • Currency converter • Engineering & scientific units Clean interface. Instant results. Accurate calculations. Smart Measurement Tools Use your device’s built-in sensors to measure in real time: • Digital Level – Check horizontal & vertical alignment • Inclinometer – Measure angles and slope • Sound Meter (dB) – Monitor noise levels • Light Meter – Measure ambient brightness • Compass – Find accurate magnetic direction • GPS Speed – Live speed tracking No extra equipment required. Learn & Improve Sharpen your speed and accuracy with interactive conversion challenges: • Timed quiz modes • Daily challenges • Progress tracking & streaks • Performance stats Great for students and anyone who wants to master unit conversions faster. Why Choose Unit Converter: Smart Tools? • All-in-one utility app • Real sensor-based measurement tools • Fast, lightweight performance • Modern, intuitive design • Accurate and reliable calculations Whether you’re solving homework, working on a project, traveling, or just need quick conversions, Unit Converter: Smart Tools gives you everything in one place. Download now and turn your device into a complete conversion and measurement toolkit. SUBSCRIPTION DETAILS - Payment will be charged to your Apple ID account at confirmation of purchase. - Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. - Your account will be charged for renewal within 24 hours prior to the end of the current period. - You can manage and cancel your subscriptions by going to your account settings on the App Store after purchase. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: http://therationalstudio.com/privacy-policy/
Screenshots
Verdict
The clearest difference is update cadence: Unit Converter & Tools at every 4 weeks against Resistor Tools's every 2 months. On price, ads, 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
Both are free to download. Resistor Tools sells 1 one-off in-app purchase and Unit Converter & Tools sells 1 in-app purchase, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.
Resistor Tools ships an update every 2 months, Unit Converter & Tools every 4 weeks. The most recent releases landed on October 10, 2026 and October 2, 2026 respectively.
| Parameter | Resistor Tools | Unit Converter & Tools |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (10 ratings) — better | — |
| Positive reviews | 75.0% of reviews | — |
| Number of ratings | 10 — better | — |
| Update frequency | Every 2 months | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 4 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | Atif Mumtaz |
In-app purchases
Resistor Tools
- Unlock pro feature$0.99
Unit Converter & Tools
- Unitverse Star3 Days trial$0.991 Month
Questions
Is Resistor Tools free?
Is Unit Converter & Tools free?
Do Resistor Tools or Unit Converter & Tools have ads?
Which is updated more often, Resistor Tools or Unit Converter & Tools?
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