Resistor vs ComPhysics Green UV
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Resistor
Quickly calculate resistor values from color bands or SMD codes, and vice versa. This tool is ideal for electronics enthusiasts, students, and DIYers working with 4, 5, or 6-band resistors and various SMD codes. It functions offline and requires no registration.
- Calculate resistor values from color bands
- Convert resistor values to color bands
- Supports 4, 5, and 6-band resistors
- Handles SMD codes (EIA-3, EIA-4, EIA-96)
- Works offline
- No registration required
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Resistor Converter – Fast & Easy Calculate resistor values, color bands, and SMD codes in seconds – perfect for electronics hobbyists, students, and professionals. Supports 4-, 5-, and 6-band resistors as well as SMD codes (EIA-3, EIA-4, EIA-96). - Tap color bands → read the value - Enter resistor → get matching color bands & SMD codes - Works offline, no registration required - Perfect for electronics, study & DIY projects Simple, fast, and free – the perfect companion for every electronics enthusiast!
ComPhysics Green UV
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IMPORTANT: This app requires the ComPhysics CP-UV01 UV Indicator and CP-UV01-SA smartphone accessory. Without the dedicated optical hardware, the displayed values are not valid UV measurements. ComPhysics Green UV uses the iPhone camera to analyze the green visible emission produced by the CP-UV01 optical system. It provides a relative UV signal called CRU (ComPhysics Relative UV) and helps you compare conditions, save results, and observe changes over time. KEY FEATURES • Real-time CRU display • Movable circular Region of Interest • Reference-versus-sample comparison • Relative effective UV transmittance and blocking display • Time recording with graph • Photo and reading capture • Sample names and notes • Local export of CSV, JSON, JPEG, and PDF files • Optional location and device-orientation data for records • Korean, English, Japanese, and Simplified Chinese PRIVACY Camera frames and measurement data are processed on the device. The app does not include advertising or third-party analytics SDKs and does not automatically upload measurement data to ComPhysics. Files leave the app only when you choose to share or export them. MEASUREMENT NOTICE ComPhysics Green UV is a relative comparison tool. It is not an absolute UV irradiance meter, certified spectroradiometer, medical device, safety-certification system, or official spectral transmittance instrument. Results depend on the iPhone model, selected camera, settings, accessory alignment, ambient light, distance, angle, source spectrum, and measurement geometry. A low reading does not prove that a UV source is safe.
Screenshots
Verdict
The clearest difference is iOS requirement: ComPhysics Green UV at 17.0 against Resistor's 26.0. 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. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Resistor | ComPhysics Green UV |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (17 ratings) — better | — |
| Number of ratings | 17 — better | — |
| Update frequency | Every 9 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 26.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Gerhard Lentschik | ComPhysics |
In-app purchases
Resistor
No in-app purchases
ComPhysics Green UV
No in-app purchases
Questions
Is Resistor free?
Is ComPhysics Green UV free?
Do Resistor or ComPhysics Green UV have ads?
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