# SPL vs JAX Stereo Tool (AU)

The clearest difference is rating: JAX Stereo Tool (AU) at 4.4 against SPL's 3.0. JAX Stereo Tool (AU) also leads on update cadence (every 11 days vs every 6 months) and price ($5.99 vs $8.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

SPL costs $8.99 and JAX Stereo Tool (AU) $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

JAX Stereo Tool (AU) holds the better App Store score, 4.4 against 3.0. That said, the two scores are not equally well evidenced: JAX Stereo Tool (AU) has 27 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 68% of SPL's written reviews are positive against 80% of JAX Stereo Tool (AU)'s.

SPL ships an update every 6 months, JAX Stereo Tool (AU) every 11 days. The most recent releases landed on October 15, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | SPL | JAX Stereo Tool (AU) |
| --- | --- | --- |
| Price | $8.99 | **$5.99** |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/spl/id293573990/reviews) | **[4.4 (27 ratings)](https://appshunter.io/ios/app/jax-stereo-tool-au/id1473390302/reviews)** |
| Number of ratings | 4 | **27** |
| Positive reviews | 67.6% of reviews | **80.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 11 days** |
| Monetization | Paid | Paid |
| Size | 29 MB | 10 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andrew Smith](https://appshunter.io/developer/291822462) | [Jens Guell](https://appshunter.io/developer/1195004865) |

## 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


### JAX Stereo Tool (AU)

[App page](https://appshunter.io/ios/app/jax-stereo-tool-au/id1473390302)

This audio processing tool allows users to visually manipulate the stereo image of digital audio. It functions as a mastering effect, enabling real-time adjustment of stereo width and the recovery of mono compatibility. The app includes a correlograph for visual feedback and optimization.

**Highlights:** Visual stereo image manipulation, Real-time stereo width adjustment, Mono compatibility recovery, Integrated correlograph for visual feedback, Audio Unit (AUv3) plugin format, System-wide availability

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

**In-app purchases:** none


## Frequently asked questions

### Is SPL free?

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

### Is JAX Stereo Tool (AU) free?

JAX Stereo Tool (AU) costs $5.99, with no in-app purchases.

### Which has better reviews, SPL or JAX Stereo Tool (AU)?

JAX Stereo Tool (AU) is rated higher. SPL averages 3.0 out of 5 from 4 ratings, while JAX Stereo Tool (AU) averages 4.4 from 27 ratings.

### Do SPL or JAX Stereo Tool (AU) have ads?

Neither SPL nor JAX Stereo Tool (AU) shows ads.

### Which is updated more often, SPL or JAX Stereo Tool (AU)?

SPL ships an update every 6 months, and JAX Stereo Tool (AU) every 11 days. Most recently, SPL was updated on October 15, 2026 and JAX Stereo Tool (AU) on October 12, 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.*