Nixie Calculator vs Clef Converter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Nixie Calculator
This calculator app features a digital paper tape to display entries, which can be copied or shared. It offers various customization options like color schemes, rounding, and display modes, blending retro aesthetics with modern device technology.
- Paper tape for entry display
- Copy and paste functionality
- Customizable color schemes
- Adjustable rounding and exponential modes
- Classic Nixie font option
- Thousand separator styles
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Features of Nixie Calculator: • Paper tape to display what you have entered. Can be copied or shared • Copy and paste entries Settings available: • Color schemes • Color layouts (in-app purchase) • Rounding options • Exponential modes • Use classic Nixie font for the display • Separators embedded with the digits • Classic pyramid and illuminated thousand separators • Classic red filter The calculator is a rounding or truncating type to fit numbers into the fixed display. Please enjoy this calculator that combines one of the first display technologies with state of the art in phone and tablet technology.
Clef Converter
Easily convert sheet music to your preferred clef using advanced computer vision. This app handles PDFs, screenshots, and camera photos, making it simpler to read music in new clefs. It's designed for musicians looking for a visual aid to overcome reading challenges.
- Automatic clef conversion
- Supports PDFs, screenshots, and camera photos
- Handles single or multiple staves
- Visualizer for musicians
- User-friendly interface
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This is the first app to automatically show you your sheet music in your preferred clef. Don't be intimidated anymore by hard lines when playing in a new clef - like I was, before finally picking up the piano. The computer vision algorithm will handle PDFs, screenshots or even camera photos. Parts can be single stave or multiple. Just choose music with symbols like the ones shown, not jazzy font. Read the help menu for tips on getting the best quality, or ask support. I am trying to create the best visualizer for musicians here, and for free.
Screenshots
Verdict
The clearest difference is rating: Nixie Calculator at 4.9 against Clef Converter's 3.8. Clef Converter's advantage is in-app purchases (none vs 1) and review sentiment (100% vs 67%). On price, ratings volume, update cadence and ads 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. Nixie Calculator sells 1 one-off in-app purchase. Clef Converter asks for nothing beyond the download.
Nixie Calculator holds the better App Store score, 4.9 against 3.8. Both are backed by a comparable volume of ratings — 15 and 11 respectively. Written reviews complicate that: 67% of Nixie Calculator's written reviews are positive against 100% of Clef Converter's, so the app with the better star average is not the one people write more warmly about.
Nixie Calculator ships an update monthly, Clef Converter every 5 weeks. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.
| Parameter | Nixie Calculator | Clef Converter |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (15 ratings) — better | 3.8 (11 ratings) |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 15 — better | 11 |
| Update frequency | Monthly — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 36 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | UNB SYSTEMS PTY LTD | Daniel Vonrhein |
Customer experience
Nixie Calculator
Clef Converter
In-app purchases
Nixie Calculator
- Color Layouts$2.99
Clef Converter
No in-app purchases
