# Spring Reverb vs Duets.fm

The clearest difference is price: Duets.fm at Free against Spring Reverb's $14.99. Duets.fm also leads on rating (4.6 vs 3.9) and update cadence (every 5 days vs every 13 months). Spring Reverb's advantage is iOS requirement (11.0 vs 15.0). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Duets.fm is free to download; Spring Reverb costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Duets.fm holds the better App Store score, 4.6 against 3.9. Both are backed by a comparable volume of ratings — 13 and 30 respectively. Written reviews point the same way: 54% of Spring Reverb's written reviews are positive against 75% of Duets.fm's.

Spring Reverb ships an update every 13 months, Duets.fm every 5 days. The most recent releases landed on September 15, 2026 and July 19, 2026 respectively.

## The numbers

| Metric | Spring Reverb | Duets.fm |
| --- | --- | --- |
| Price | $14.99 | **Free** |
| Rating | [3.9 (13 ratings)](https://appshunter.io/ios/app/spring-reverb/id1480037666/reviews) | **[4.6 (30 ratings)](https://appshunter.io/ios/app/duetsfm/id6463237649/reviews)** |
| Number of ratings | 13 | **30** |
| Positive reviews | 53.8% of reviews | **75.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 5 days** |
| Monetization | Paid | **Free** |
| Size | 22 MB | 36 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Eventide](https://appshunter.io/developer/546518026) | [QuantumBytes LLC](https://appshunter.io/developer/1704171247) |

## What reviewers say

### Spring Reverb

[App page](https://appshunter.io/ios/app/spring-reverb/id1480037666)

This app emulates the sound of vintage spring reverbs found in guitar amplifiers, offering unique sonic possibilities beyond traditional hardware. It allows for detailed manipulation of physical parameters, creating both authentic and experimental reverb effects for various instruments.

**Highlights:** Emulates popular spring reverb sounds, Manipulate physical spring parameters, Morph between different spring configurations, Tempo-synced reverb decay, Tube-amp style tremolo (pre/post reverb), Modulation for chorus-like effects, Dynamic control with The Ribbon

**In-app purchases:** none


### Duets.fm

[App page](https://appshunter.io/ios/app/duetsfm/id6463237649)

Enhance your Smule singing experience with this companion app. Discover new songs, create custom playlists, and download them for offline playback. Track your performance history and analyze your collaborations with other singers.

**Highlights:** Random song mixes, Custom playlist creation, Offline song downloads, Advanced song/singer search, Join and solo history tracking, Singer follow/follower analysis

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Spring Reverb free?

Spring Reverb costs $14.99, with no in-app purchases.

### Is Duets.fm free?

Duets.fm is free to download, with no in-app purchases.

### Which has better reviews, Spring Reverb or Duets.fm?

Duets.fm is rated higher. Spring Reverb averages 3.9 out of 5 from 13 ratings, while Duets.fm averages 4.6 from 30 ratings.

### Do Spring Reverb or Duets.fm have ads?

Neither Spring Reverb nor Duets.fm shows ads.

### Which is updated more often, Spring Reverb or Duets.fm?

Spring Reverb ships an update every 13 months, and Duets.fm every 5 days. Most recently, Spring Reverb was updated on September 15, 2026 and Duets.fm on July 19, 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.*