SyndtSphere vs Solderbox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SyndtSphere
Explore a novel approach to sound design with this synthesizer. Rotate a sphere with over 70 presets to discover ideal sounds, enhanced by a stereo ping-pong delay and global settings. It's AUv3 compatible for use within other music production apps.
- Spherical sound exploration
- AUv3 plugin compatibility
- High-quality audio engine
- Stereo ping-pong delay
- Legato mode with glide
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This synthesizer offers a brand new way of finding the optimal sound. By rotating a sphere that consists of more than 70 professionally created states anyone can dial in the perfect sound. In addition to the sphere, a ping-pong delay and a few more global settings are available. SyndtSphere is based on the more traditional polyphonic synthesizer Syndt (also available on the App Store). A video demo is available at the developers website. Features: • AUv3 Compatible - use it as a plugin inside Garageband or any other AUv3 compatible host app. • High quality internal audio engine. • Stereo ping-pong delay • Optional legato mode with glide speed setting. Feedback or suggestions? Drop us a mail: support(at)klevgrand.se or @klevgrand on Twitter
Solderbox
This app is a compact, semi-modular synthesizer designed for generative music creation. It offers a comprehensive set of modular functions, aiming for analog-like sound and behavior with unique digital effects and an 'Instability Engine' for organic fluctuations.
- Generative synthesis tools
- Analog-like sound emulation
- Instability Engine for organic fluctuations
- Audio Unit (AUv3) compatibility
- Built-in Pulsequencer melody generator
- Multiple filter modes
- Stackable patch cables
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Solderbox is a compact semimodular synthesizer, made in collaboration with Jakob Haq. It is heavily based on Jakob's own modular rack design (which features a lot of modules made by hand). The app is designed to offer a set of modular functions that is both comprehensive and eclectic, including several tools for generative synthesis, random signals and the surgical mangling of audio waves and modulation signals. A lot of effort went into making everything sound and behave as analog as digitally possible (with the exception of the unashamedly digital Entropy lo-fi effect processor). Additionally, the built-in Instability Engine injects the subtle fluctuations simulating the effects of crosstalk, leaky signals and expired electrical components. This is a living instrument with a soul of its own. - Full Audio Unit compatibility (AUv3 instrument, audio effect) - Universal design (iPhone, iPad, MacOS AUv3) - Built-in Pulsequencer (LFO-based generative melody generator with custom scales) - 4 mode Low-pass filter (6, 12, 18, 24 dB) - 3 voice polyphony - Drone mode - Stackable patch cables - DIY Lo-Fi digital delay circuit emulation - All synth settings exposed a AU Parameters (for automation and MIDI learning in your host of choice) Find the user manual on ruismaker.com
Screenshots
Verdict
The clearest difference is review sentiment: Solderbox at 90% against SyndtSphere's 40%. Solderbox also leads on rating (5.0 vs 3.7) and update cadence (every 6 weeks vs every 23 months). SyndtSphere's advantage is price ($1.99 vs $12.99). On ratings volume, ads, in-app purchases and monetization model 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
SyndtSphere costs $1.99 and Solderbox $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Solderbox holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 18 and 27 respectively. Written reviews point the same way: 40% of SyndtSphere's written reviews are positive against 90% of Solderbox's.
SyndtSphere ships an update every 23 months, Solderbox every 6 weeks. The most recent releases landed on October 9, 2026 and October 13, 2026 respectively.
| Parameter | SyndtSphere | Solderbox |
|---|---|---|
| Price | $1.99 — better | $12.99 |
| Rating | 3.7 (18 ratings) | 5.0 (27 ratings) — better |
| Positive reviews | 40.0% of reviews | 90.0% of reviews — better |
| Number of ratings | 18 | 27 — better |
| Update frequency | Every 23 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 13.0 | 13 |
| Further details — not scored | ||
| Size | 15 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Klevgrand Produkter AB | Bram Bos |
Customer experience
SyndtSphere
Solderbox
In-app purchases
SyndtSphere
No in-app purchases
Solderbox
No in-app purchases
