# Stringcalculator vs Passaggi

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.

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.

## The numbers

| Metric | Stringcalculator | Passaggi |
| --- | --- | --- |
| Price | **$2.99** | $14.99 |
| Rating | — | **[4.0 (3 ratings)](https://appshunter.io/ios/app/passaggi/id1499123312/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 16 months** | Every 42 months |
| Monetization | Paid | Paid |
| Size | 1 MB | 38 MB |
| Requires iOS | 17.6 | **11.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Martin Uhlig](https://appshunter.io/developer/1414861205) | [The Septenary Foundation](https://appshunter.io/developer/1499123311) |

## What reviewers say

### Stringcalculator

[App page](https://appshunter.io/ios/app/stringcalculator/id1426367350)

Calculate string properties for various instruments. Determine diameter, tension, and tone based on material, frequency, and scale length. Supports multiple units of measurement.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


### Passaggi

[App page](https://appshunter.io/ios/app/passaggi/id1499123312)

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.

**Highlights:** High-quality audio backing tracks, Improvisation and ornamentation practice, Adjustable pitch and tempo, User-defined looping, Historically accurate organ samples, Complements historical treatises

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Stringcalculator free?

Stringcalculator costs $2.99, with no in-app purchases.

### Is Passaggi free?

Passaggi costs $14.99, with no in-app purchases.

### Do Stringcalculator or Passaggi have ads?

Neither Stringcalculator nor Passaggi shows ads.

### Which is updated more often, Stringcalculator or Passaggi?

Stringcalculator ships an update every 16 months, and Passaggi every 42 months. Most recently, Stringcalculator was updated on October 15, 2026 and Passaggi on October 5, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*