# SPL vs MF

The clearest difference is rating: MF at 4.4 against SPL's 3.0. MF also leads on update cadence (monthly vs every 6 months) and iOS requirement (11.0 vs 15.0). SPL's advantage is price ($8.99 vs $14.99) and review sentiment (68% vs 50%). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

SPL costs $8.99 and MF $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

MF holds the better App Store score, 4.4 against 3.0. Both are backed by a comparable volume of ratings — 4 and 7 respectively. Written reviews complicate that: 68% of SPL's written reviews are positive against 50% of MF's, so the app with the better star average is not the one people write more warmly about.

SPL ships an update every 6 months, MF monthly. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | SPL | MF |
| --- | --- | --- |
| Price | **$8.99** | $14.99 |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/spl/id293573990/reviews) | **[4.4 (7 ratings)](https://appshunter.io/ios/app/mf-107s-freqbox/id6450717622/reviews)** |
| Number of ratings | 4 | **7** |
| Positive reviews | **67.6% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | Paid | Paid |
| Size | 30 MB | 41 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andrew Smith](https://appshunter.io/developer/291822462) | [Moog Music Inc.](https://appshunter.io/developer/396776421) |

## What reviewers say

### SPL

[App page](https://appshunter.io/ios/app/spl/id293573990)

This professional-grade digital sound level meter measures decibels with advanced modes and filters meeting ANSI Type 1 standards. It allows storing, exporting, and calibrating measurements, and can be used with external calibrated microphones for precise results.

**Highlights:** Professional-grade digital sound level meter, ANSI/IEC Type 1 standards compliant filters and modes, Store, recall, and export GPS/time-stamped results, Supports external calibrated microphones, Adjustable calibration for accuracy, Internal mic compensation filter

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### MF

[App page](https://appshunter.io/ios/app/mf-107s-freqbox/id6450717622)

This app recreates a classic analog effects pedal, offering a voltage-controlled oscillator with variable waveshape and envelope follower. It allows for processing and modulation of various audio inputs to create unique musical sounds.

**Highlights:** Voltage-controlled oscillator (VCO), Variable waveshape, Hard sync and frequency modulation, Envelope follower, Modulate VCO frequency with input dynamics, Mix VCO with audio input, AUv3 effects plug-in

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SPL free?

SPL costs $8.99, with no in-app purchases.

### Is MF free?

MF costs $14.99, with no in-app purchases.

### Which has better reviews, SPL or MF?

MF is rated higher. SPL averages 3.0 out of 5 from 4 ratings, while MF averages 4.4 from 7 ratings.

### Do SPL or MF have ads?

Neither SPL nor MF shows ads.

### Which is updated more often, SPL or MF?

SPL ships an update every 6 months, and MF monthly. Most recently, SPL was updated on October 23, 2026 and MF on October 24, 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.*