# F vs Harmonizer audio effect

The clearest difference is review sentiment: F at 78% against Harmonizer audio effect's 23%. F also leads on rating (5.0 vs 3.0). Harmonizer audio effect's advantage is price ($1.99 vs $2.99) and iOS requirement (10.0 vs 12.0). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

F costs $2.99 and Harmonizer audio effect $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

F holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 18 and 9 respectively. Written reviews point the same way: 78% of F's written reviews are positive against 23% of Harmonizer audio effect's.

Both ship on a similar rhythm, roughly every 8 months. The most recent releases landed on October 9, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | F | Harmonizer audio effect |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| Rating | **[5.0 (18 ratings)](https://appshunter.io/ios/app/f-16-filter/id1074502761/reviews)** | [3.0 (9 ratings)](https://appshunter.io/ios/app/harmonizer-audio-effect/id1209475596/reviews) |
| Number of ratings | **18** | 9 |
| Positive reviews | **77.8% of reviews** | 23.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | Every 8 months |
| Monetization | **Free** | Paid |
| Size | 15 MB | 14 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Blamsoft, Inc.](https://appshunter.io/developer/1051938244) | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) |

## What reviewers say

### F

[App page](https://appshunter.io/ios/app/f-16-filter/id1074502761)

This audio effect plugin offers sixteen versatile filter modes with precise controls for frequency, resonance, and analog-style saturation. Visualize your frequency response in real-time for intuitive adjustments. It integrates seamlessly with popular AUv3 compatible music production apps.

**Highlights:** Sixteen filter modes, Frequency and resonance controls, Analog-style saturation, Wet/dry mix, Frequency response display, Zero Delay Feedback algorithm

**In-app purchases:** none


### Harmonizer audio effect

[App page](https://appshunter.io/ios/app/harmonizer-audio-effect/id1209475596)

This real-time audio effect app shifts pitch and adds harmonies to your original sound. It functions as an Audio Unit plugin or a standalone effect using your device's microphone or external audio interfaces. The pitch shifting preserves the original timing and tempo.

**Highlights:** Real-time pitch shifting, Two harmony voices, Smooth pitch shift controls, Adjustable voice volumes, Master reverb effect, Standalone mode via microphone

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is F free?

F costs $2.99, with no in-app purchases.

### Is Harmonizer audio effect free?

Harmonizer audio effect costs $1.99, with no in-app purchases.

### Which has better reviews, F or Harmonizer audio effect?

F is rated higher. F averages 5.0 out of 5 from 18 ratings, while Harmonizer audio effect averages 3.0 from 9 ratings.

### Do F or Harmonizer audio effect have ads?

Neither F nor Harmonizer audio effect shows ads.

### Which is updated more often, F or Harmonizer audio effect?

F ships an update every 8 months, and Harmonizer audio effect every 8 months. Most recently, F was updated on October 9, 2026 and Harmonizer audio effect on October 7, 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.*