Stringcalculator vs Drones
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.
Drones
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.
- 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
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Drones is a library of 50+ sounds plus tools to mix and create your own noise or endless soundscapes. CREATE CUSTOM NOISE Generate pink, white, brown, and other noise colors with adjustable frequency filters. Fine-tune the exact sound that works for you. MIX YOUR SOUNDSCAPES Combine up to 4 sources — your custom noises plus our catalog — in a simple mixer. Slow loops down and re-pitch them until a mix is unmistakably yours. 50+ CATALOG SOUNDS, ONE ARTIST A library of field recordings, ambient drones, and environmental audio — all recorded and produced by a single ambient artist. IMPORT YOUR SOUNDS Import sounds from your files. Set loop start and end positions along with fades. Use your sounds alongside library sounds ADD EFFECTS TO YOUR MIXES Reverb, Echo, Tape Wobble, Pitch Shift, Drift and more. SLEEP TIMER Gradually fade out your mix and drift off without worrying about stopping playback. SAVE & REPLAY Save your noises and mixes to a personal library, each with generative pixel album art. Some use Drones for sleep. Some for live performance or music production. Others for focus while working or studying. Some just love the sounds. However you use it, Drones is yours to explore. Drones is a pay-once ambient noise mixer for people who want to craft their sound, not rent it. No subscriptions — ever. After 7 day trial, free users still have access to 15 unique loops.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Stringcalculator | Drones |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | — | 3 — better |
| Update frequency | Every 16 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 — better | 18.6 |
| Further details — not scored | ||
| Size | 1 MB | 121 MB |
| Age rating | 4+ | 4+ |
| Developer | Martin Uhlig | William Shouldis |
Customer experience
Stringcalculator
Drones
In-app purchases
Stringcalculator
No in-app purchases
Drones
- Lifetime Access$3.99









