Stringcalculator vs Passaggi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stringcalculator
Calculate string properties for various instruments. Determine diameter, tension, and tone based on material, frequency, and scale length. Supports multiple units of measurement.
- Calculate string diameter, tension, and tone
- Supports gut, nylgut, carbon, Tynex, and nylon strings
- Set custom frequencies
- Calculate in cm, mm, or inches
- Adjustable scale length
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A string calculator to calculate single strings for historical (or modern) stringed instruments. Calculates strings from gut, nylgut, carbon (PVF), Tynex and nylon. Diameter, tension, tone and scale can be calculated. You can set any frequency instead of the chamber tone a'. Calculates in cm, mm or inch.
Passaggi
This app provides high-quality audio backing tracks for historical music performers to practice improvisation and ornamentation. It features adjustable tempo and pitch, user-defined looping, and historically accurate organ samples to enhance immersive study.
- High-quality audio backing tracks
- Improvisation and ornamentation practice
- Adjustable pitch and tempo
- User-defined looping
- Historically accurate organ samples
- Complements historical treatises
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Passaggi is an improvisation and ornamentation practice app for historical performers. The app delivers high-quality audio backing tracks for personal practice, which, when used in conjunction with facsimiles or modern editions of historical sources, enable the user to develop skills in the areas of improvisation and ornamentation. Suitable for students, amateurs and professionals alike, the app features adjustable pitch and tempo settings and user-defined looping capabilities. Tracks are recorded using a sampled historical organ in a temperament appropriate to the repertoire and are designed to complement the pedagogy of historical treatises. The idea behind Passaggi springs from a desire, common to many performers of historical repertoires, to recreate aspects of the musical experience as it may have existed at the time a piece of music was written. Improvisation and ornamentation may form only one aspect of this wide-reaching desire, yet it is clear that in this area students and professionals would achieve more successful immersive study and practice if the harmonic and musical context for improvisation, ornamentation and diminution were more easily accessible. How many of us can open Dalla Casa’s Il vero modo… and sing the baseline to his exercise embellishing Striggio’s I dolci colli, for example? And how much more profitable would our practice of this exercise be if we could? How many more of us would practise improvising on a ground, if we had a ground? The Passaggi project will enable more effective exploration of historical sources and approaches by providing digitally some aspects of the innate and inherited musical awareness common to all musicians of the past that we strive to connect with in the twenty-first century.
Screenshots
Verdict
The clearest difference is price: Stringcalculator at $2.99 against Passaggi's $14.99. Stringcalculator also leads on review sentiment (100% vs 67%) and update cadence (every 16 months vs every 42 months). Passaggi's advantage is iOS requirement (11.0 vs 17.6). On ads, in-app purchases, monetization model 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
Stringcalculator costs $2.99 and Passaggi $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Stringcalculator ships an update every 16 months, Passaggi every 42 months. The most recent releases landed on October 15, 2026 and October 5, 2026 respectively.
| Parameter | Stringcalculator | Passaggi |
|---|---|---|
| Price | $2.99 — better | $14.99 |
| Rating | — | 4.0 (3 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 66.7% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 16 months — better | Every 42 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.6 | 11.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | Martin Uhlig | The Septenary Foundation |
Customer experience
Stringcalculator
Passaggi
In-app purchases
Stringcalculator
No in-app purchases
Passaggi
No in-app purchases









