# SpectrumView vs DeLTAS Toolkit

The clearest difference is in-app purchases: DeLTAS Toolkit at none against SpectrumView's 7. SpectrumView's advantage is device support and iOS requirement (9.0 vs 16.0). On price there is nothing between them.

Both are free to download. SpectrumView sells 7 one-off in-app purchases. DeLTAS Toolkit asks for nothing beyond the download.

## The numbers

| Metric | SpectrumView | DeLTAS Toolkit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (74 ratings)](https://appshunter.io/ios/app/spectrumview/id472662922/reviews)** | — |
| Number of ratings | **74** | — |
| Positive reviews | 62.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | — |
| Update frequency | Every 10 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 17 MB | 43 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [Oxford Wave Research Ltd.](https://appshunter.io/developer/472662925) | [University of Newcastle upon Tyne](https://appshunter.io/developer/352911158) |

## What reviewers say

### SpectrumView

[App page](https://appshunter.io/ios/app/spectrumview/id472662922)

This app provides real-time audio analysis with a dynamic spectrogram and spectrum analyzer. Visualize audible and inaudible frequencies, measure tones, get feedback on speech, identify sounds, and calibrate instruments. Access recordings and snapshots easily.

**Highlights:** Real-time spectrogram and spectrum analyzer, Configurable sample rate and frequency resolution, Record, pause, and playback audio files, Generate snapshots of spectrum data, Web file transfer, Tap data cursor for precise frequency and level, Musical notes or frequency display on tap

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Enable peak hold | $0.99 | one-time |
| Access iTunes and SoundCould | $0.99 | one-time |
| Generate data snapshot | $0.99 | one-time |
| Enable Log Scale | $1.99 | one-time |
| Disable recording length limit | $1.99 | one-time |
| Enable pinch to zoom | $1.99 | one-time |
| Enable Web File Transfer | $1.99 | one-time |

**What reviewers like**

- 👍 Accurate and reliable spectrogram visualization
- 🎯 Highly configurable FFT and sampling settings
- 🎨 Beautiful and intuitive user interface
- 📊 Excellent for analyzing speech, music, and animal sounds
- ⚙️ Useful for professional audio calibration and research

**What reviewers complain about**

- 💰 Aggressive in-app purchase model for basic features
- 🔐 Unexplained location permission requests
- 📉 Linear frequency scale wastes screen space
- ⏱️ Slow app startup times
- 🎯 Limited frequency range (8kHz cap in recent versions)

**Reported bugs**

- App crashes on startup after updates
- Crashes when attempting to zoom on spectrograms
- Crashes when playing files from iTunes library
- Microphone hijacking error messages
- Pinch-to-zoom and pan features not functioning properly

**Requested features**

- Logarithmic frequency scale for audio analysis
- Adjustable time scale/window for spectrograms
- Ability to analyze audio from music library/iTunes
- Longer-term averaging for spectrum analyzer
- A-weighting frequency selection


### DeLTAS Toolkit

[App page](https://appshunter.io/ios/app/deltas-toolkit/id6758672635)

**In-app purchases:** none


## Frequently asked questions

### Is SpectrumView free?

SpectrumView is free to download, with in-app purchases available.

### Is DeLTAS Toolkit free?

DeLTAS Toolkit is free to download, with no in-app purchases.

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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.*