# Stringcalculator vs Drones

The clearest difference is price: Drones at Free against Stringcalculator's $2.99. Drones also leads on update cadence (every 10 days vs every 16 months). Stringcalculator's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Drones is free to download; Stringcalculator costs $2.99 up front. Drones sells 1 one-off in-app purchase. Stringcalculator asks for nothing beyond the download.

Stringcalculator ships an update every 16 months, Drones every 10 days. The most recent releases landed on October 15, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Stringcalculator | Drones |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/drones-ambient-noise-mixer/id6756897178/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 10 days** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 121 MB |
| Requires iOS | **17.6** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Martin Uhlig](https://appshunter.io/developer/1414861205) | [William Shouldis](https://appshunter.io/developer/1846001135) |

## 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


### Drones

[App page](https://appshunter.io/ios/app/drones-ambient-noise-mixer/id6756897178)

Craft personalized audio environments with custom noise generation and a library of ambient sounds. Mix up to four sources, set a sleep timer, and save your unique soundscapes. Enjoy a one-time purchase for full access to all features and future updates.

**Highlights:** Custom noise generation (pink, white, brown), Adjustable frequency filters, Mix up to 4 audio sources, 50+ catalog sounds, Sleep timer with fade-out, Save and replay custom mixes, Generative album art

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $3.99 | one-time |


## Frequently asked questions

### Is Stringcalculator free?

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

### Is Drones free?

Drones is free to download, with in-app purchases available.

### Do Stringcalculator or Drones have ads?

Neither Stringcalculator nor Drones shows ads.

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

Stringcalculator ships an update every 16 months, and Drones every 10 days. Most recently, Stringcalculator was updated on October 15, 2026 and Drones on October 6, 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.*