Comparison

Speldosa vs Relic Flow

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Four music box sound models
  • Two room ambiences
  • Algorithmic reverb
  • Optional vibrato
  • Standalone app and AUv3 plugin
Features
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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

Speldosa4 screens
Relic Flow2 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Speldosa costs $9.99 and Relic Flow $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
Speldosa versus Relic Flow: the parameters behind the verdict, then further details
ParameterSpeldosaRelic Flow
Price$9.99$1.99 — better
Rating4.8 (28 ratings)4.8 (26 ratings)
Positive reviews72.4% of reviews93.3% of reviews — better
Number of ratings28 — better26
Update frequencyEvery 10 months — betterEvery 17 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size15 MB6 MB
Age rating4+4+
DeveloperKlevgrand Produkter ABAlexander Zolotov

Customer experience

Speldosa

All ratings28 ratings
Positive92.9%
Neutral0.0%
Negative7.1%
Written reviews29 reviews
Positive72.4%
Neutral10.3%
Negative17.2%

Relic Flow

All ratings26 ratings
Positive96.2%
Neutral0.0%
Negative3.8%
Written reviews15 reviews
Positive93.3%
Neutral0.0%
Negative6.7%

In-app purchases

None

Speldosa

No in-app purchases

None

Relic Flow

No in-app purchases

Questions

Is Speldosa free?
Speldosa costs $9.99, with no in-app purchases.
Is Relic Flow free?
Relic Flow costs $1.99, with no in-app purchases.
Which has better reviews, Speldosa or Relic Flow?
Speldosa and Relic Flow are both rated 4.8 out of 5 on the App Store, from 28 and 26 ratings respectively.
Do Speldosa or Relic Flow have ads?
Neither Speldosa nor Relic Flow shows ads.
Which is updated more often, Speldosa or Relic Flow?
Speldosa ships an update every 10 months, and Relic Flow every 17 months. Most recently, Speldosa was updated on September 22, 2026 and Relic Flow on September 17, 2026.

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