Speldosa vs Relic Flow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Speldosa
This digital instrument plugin recreates the enchanting sound of a music box, offering four distinct sonic characters and two room ambiences. It's designed to inspire immediate melody creation and can be used as a standalone app or an AUv3 plugin.
- Four music box sound models
- Two room ambiences
- Algorithmic reverb
- Optional vibrato
- Standalone app and AUv3 plugin
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Speldosa (Wintergatan Music Box) is an Audio Unit instrument, the result of a unique collaboration between Klevgrand and the Swedish artist Wintergatan/Martin Molin. Wintergatan has primarily worked in the physical world (the Marble Machine is probably the most astonishing example), while Klevgrand has performed its craft within the digital sphere. When these two worlds now meet, the result is something that both visually and aurally inspires the creation of new compelling melodies. Speldosa (Swedish for “Music Box”) is the essence of the shared beliefs of Klevgrand and Wintergatan, and their fascination with minimalism. A simple melody played on a music box can contain an equal amount of emotional power as any symphonic work. There is something about the music box sound that never ceases to fascinate. The instrument itself has been meticulously recorded by Wintergatan and transformed into a playable digital instrument plugin. It features four different models (Modern, Vintage, Antique, and Eternal = Reversed), two different Room models, and an algorithmic reverb. Wintergatan about Speldosa: "I created the sound by sampling a music box using an acoustic guitar as resonance box. I chose the best samples and it was instant magic. The Music Box went on to become the sonic signature for my two bands, Detektivbyrån and Wintergatan, both recognised for their unique sound. The Speldosa has been the secret sauce in my music career and i hope other musicians finds it as useful as i have. There is a special quality to this exact music box sound that lifts it above the novelty feeling of a toy and turns it into a real music instrument. It just sounds so good, that’s really it. And it is a sound that makes you write music instantly - the music comes from the sound itself. During the collaboration with Klevgrand, when they sent me the first beta version of the plugin, i ended up playing around with the sound for three hours, losing track of time. I wrote three songs that day when i was scheduled to actually do something else. That’s what the sound does to me, and i think it will do the same for others." Features: - Four different music box characters - Two room ambiences - Spacious reverb - Optional vibrato - Output level Speldosa works both as a standalone app and as an AUv3 plugin. Check out the product web page for more info, sound examples and a user manual. Feedback or suggestions? Drop us a mail: support(at)klevgrand.se or @klevgrand on Twitter.
Relic Flow
Generate unique Lo-Fi rhythms, noise patterns, and drum loops using advanced synthesis algorithms. Explore billions of sound samples with intuitive controls and real-time audio recording. Perfect for musicians and sound designers seeking endless creative possibilities.
- Lo-Fi rhythm and drum loop generation
- Billions of unique sound samples
- Real-time audio recording to WAV
- Multiple input methods (on-screen, PC keyboard, MIDI)
- Export to WAV, SunVox, and text clipboard
- iOS Audio Unit Extension (AUv3) support
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Relic Flow is a generator of Lo-Fi rhythms, noise patterns and drum loops based on unique synthesis algorithms from NightRadio. More than 4 billion samples from the depths of the Mathematical Universe! Features: * search for new sounds with three buttons: next random set, edit code, previous set; each set of 12 sounds corresponds to a code of 8 characters; * three types of keyboards for live performing: on-screen buttons, PC keyboard, MIDI input; * several processing parameters + control via MIDI; * real-time audio recording to WAV (32-bit); * export to: WAV (one file or a set), SunVox (samples + effects in one file), text clipboard; * the LCK button freezes individual samples - they will not change during the search for new sets; * iOS Audio Unit Extension (AUv3). Double clicking on a parameter opens a window for setting the exact value. If you enable the Hold option, the notes will play endlessly, without reacting to key release (noteOff) events; turning the note on again works like turning it off; there are two ways to enable this option: 1) using the Hold parameter in the "MIDI Mapping" window; 2) by pressing the HOLD button, which appears in place of LCK while playing the musical keyboard: press HOLD, release the desired notes - then the released notes will continue to play.
Screenshots
Verdict
The clearest difference is price: Relic Flow at $1.99 against Speldosa's $9.99. Relic Flow also leads on review sentiment (93% vs 72%). On rating, ratings volume, update cadence and ads 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
Speldosa costs $9.99 and Relic Flow $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.8 for Speldosa against 4.8 for Relic Flow. Both are backed by a comparable volume of ratings — 28 and 26 respectively. Written reviews are what separate them: 72% of Speldosa's written reviews are positive against 93% of Relic Flow's.
Speldosa ships an update every 10 months, Relic Flow every 17 months. The most recent releases landed on September 22, 2026 and September 17, 2026 respectively.
| Parameter | Speldosa | Relic Flow |
|---|---|---|
| Price | $9.99 | $1.99 — better |
| Rating | 4.8 (28 ratings) | 4.8 (26 ratings) |
| Positive reviews | 72.4% of reviews | 93.3% of reviews — better |
| Number of ratings | 28 — better | 26 |
| Update frequency | Every 10 months — better | Every 17 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 15 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Klevgrand Produkter AB | Alexander Zolotov |
Customer experience
Speldosa
Relic Flow
In-app purchases
Speldosa
No in-app purchases
Relic Flow
No in-app purchases









