5ths Machine vs Smartleggio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
5ths Machine
Explore the theoretical intricacies of key signatures with an interactive quiz. Learn about the 12-position equal temperament system and discover how to identify keys with an unusual number of sharps. Understand music theory through a unique perspective.
- Key signature quiz
- Equal temperament system explanation
- Theoretical key signature exploration
- Background information on music theory
- Quiz tips and strategies
- Chronology of music theory concepts
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Think you know your key signatures cold? Answer this: which key has 41 sharps? The equal temperament system is a circle with 12 positions, just like a clock. And, just like on a clock, the hands keep going around and around forever. The key signature of 41 sharps is theoretically consistent with the Western diatonic system ― learn why, and learn how to find out what key it is. The Background Information and the Quiz Tips explain the system in detail, and Chronology puts it all in perspective. Enjoy the “Perpetual 5ths Machine Boogie” while key signatures you’ve never seen before pass by on parade. Then, buckle down and solve the Quiz questions. NOW you understand music theory the 5ths Machine way!
Smartleggio
This app helps musicians read and perform sheet music with features like automatic page turning and score management. It supports various file formats and offers basic editing tools, with a focus on piano players but useful for other instruments.
- Supports MusicXML and PDF formats
- Automatic page turning via microphone or MIDI
- Manual page turning with gestures or Bluetooth
- Optical music recognition for PDFs
- Score library management
- Editing and annotation tools
- Free online score library
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Smartleggio is a sheet music reader application which tries to improve the process of reading and performing from sheet music. It supports popular MusicXML and PDF file formats and is able to perform automatic page turning while you are playing the score. Main features of Smartleggio: - Support for sheet music in widespread MusicXML and PDF file formats; - Own file format designed for optimal experience of reading sheet music on tablets and other mobile devices; - Automatic page turning using microphone data or data from a MIDI connection; - Manual context-aware page turning using Bluetooth page turner or swipe up/down gestures; - Experimental OMR (optical music recognition) functionality for PDF scores to facilitate playback and automatic page turning for scores in this format; - Basic score library management features (playlists, search etc.); - Basic editing and annotation features (handwriting notes, repeats structure editing, for MusicXML a limited music content editing is available); - Access to a free online library of piano scores. The application is currently focused on piano experience but can be useful for other pitched instrument players as well. Smartleggio is being actively developed, and the team plans to expand and improve the application in future. If you have any suggestions, feedback or face any issues with the app, please write us an e-mail at support@smartleggio.com.
Screenshots
Verdict
The clearest difference is price: Smartleggio at Free against 5ths Machine's $1.99. Smartleggio also leads on update cadence (every 3 months vs every 24 months). 5ths Machine's advantage is rating (5.0 vs 1.5). On ratings volume, 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
Smartleggio is free to download; 5ths Machine costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
5ths Machine holds the better App Store score, 5.0 against 1.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
5ths Machine ships an update every 24 months, Smartleggio every 3 months. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.
| Parameter | 5ths Machine | Smartleggio |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | 1.5 (2 ratings) |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 24 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 18 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Lucy Hudson | Dzmitry Avadok |
Customer experience
5ths Machine
Smartleggio
In-app purchases
5ths Machine
No in-app purchases
Smartleggio
No in-app purchases
Questions
Is 5ths Machine free?
Is Smartleggio free?
Which has better reviews, 5ths Machine or Smartleggio?
Do 5ths Machine or Smartleggio have ads?
Which is updated more often, 5ths Machine or Smartleggio?
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