# SPL Graph vs Hi

The clearest difference is price: SPL Graph at $9.99 against Hi's $34.99. SPL Graph also leads on ratings volume (3 vs 1). Hi's advantage is rating (5.0 vs 3.7) and review sentiment (100% vs 64%). On ads, monetization model, device support and iOS requirement there is nothing between them.

SPL Graph costs $9.99 and Hi $34.99 up front. SPL Graph sells 5 in-app purchases, starting at $19.99 per month. Hi asks for nothing beyond the download.

Hi holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews point the same way: 64% of SPL Graph's written reviews are positive against 100% of Hi's.

SPL Graph ships an update every 6 months, Hi fortnightly. The most recent releases landed on October 23, 2026 and August 18, 2026 respectively.

## The numbers

| Metric | SPL Graph | Hi |
| --- | --- | --- |
| Price | **$9.99** | $34.99 |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/spl-graph/id307451201/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hi-fi-damper-calculator/id6740542005/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 64.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Fortnightly** |
| Monetization | Paid | Paid |
| Size | 30 MB | 15 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andrew Smith](https://appshunter.io/developer/291822462) | [Artificial Intelligence Technologies J.K. Oy](https://appshunter.io/developer/1050973715) |

## What reviewers say

### SPL Graph

[App page](https://appshunter.io/ios/app/spl-graph/id307451201)

This app analyzes sound pressure levels and environmental noise in real-time. It logs audio, captures video, and performs frequency analysis, with options for advanced octave band analysis and professional microphone integration. Receive email notifications for exceeding noise limits and auto-save data for continuous monitoring.

**Highlights:** Real-time sound pressure level analysis, Audio recording and playback, Optional video capture, Octave and 1/3 octave band analysis, 3D frequency plot, Ln SPL value calculation, Email notifications for noise limits

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remote Noise Monitoring | $19.99 | per month |
| Remote Noise Mid Level | $79.99 | per month |
| Remote Noise Large | $149.99 | per month |
| Octave Band SPL Logging | $9.99 | one-time |
| Video Capture Option | $19.99 | one-time |


### Hi

[App page](https://appshunter.io/ios/app/hi-fi-damper-calculator/id6740542005)

Calculate and design custom ball-pack dampers for your audio equipment. This app helps you select the right reservoirs, number of balls, and dimensions to effectively reduce vibrations for improved audio playback. Build your own cost-effective damping solutions tailored to your needs.

**Highlights:** Select damping solution based on audio equipment weight, Choose reservoir shape and ball diameter, Calculate number of balls per reservoir, Determine net volume and dimensions, Reduce microvibrations and oscillations, Cost-effective DIY assembly

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

**In-app purchases:** none


## Frequently asked questions

### Is SPL Graph free?

SPL Graph costs $9.99, and also offers in-app purchases.

### Is Hi free?

Hi costs $34.99, with no in-app purchases.

### Which has better reviews, SPL Graph or Hi?

Hi is rated higher. SPL Graph averages 3.7 out of 5 from 3 ratings, while Hi averages 5.0 from 1 ratings.

### Do SPL Graph or Hi have ads?

Neither SPL Graph nor Hi shows ads.

### Which is updated more often, SPL Graph or Hi?

SPL Graph ships an update every 6 months, and Hi fortnightly. Most recently, SPL Graph was updated on October 23, 2026 and Hi on August 18, 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.*