# SpectrumView vs TD Snap®

The clearest difference is rating: TD Snap® at 4.2 against SpectrumView's 3.1. TD Snap® also leads on update cadence (every 2 months vs every 10 months) and ratings volume (810 vs 74). SpectrumView's advantage is monetization model (free with in-app purchases vs subscription) and review sentiment (63% vs 30%). On price, ads and in-app purchases there is nothing between them.

Both are free to download. SpectrumView sells 7 one-off in-app purchases and TD Snap® sells 10 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

TD Snap® holds the better App Store score, 4.2 against 3.1. That said, the two scores are not equally well evidenced: TD Snap® has 810 ratings behind it against 74, so its average is the more settled of the two. Written reviews complicate that: 63% of SpectrumView's written reviews are positive against 30% of TD Snap®'s, so the app with the better star average is not the one people write more warmly about.

SpectrumView ships an update every 10 months, TD Snap® every 2 months. The most recent releases landed on September 21, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | SpectrumView | TD Snap® |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (74 ratings)](https://appshunter.io/ios/app/spectrumview/id472662922/reviews) | **[4.2 (810 ratings)](https://appshunter.io/ios/app/td-snap/id1072799231/reviews)** |
| Number of ratings | 74 | **810** |
| Positive reviews | **63.0% of reviews** | 29.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 months** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 17 MB | 3.4 GB |
| Requires iOS | **9.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Oxford Wave Research Ltd.](https://appshunter.io/developer/472662925) | [Tobii Dynavox LLC](https://appshunter.io/developer/446210474) |

## 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


### TD Snap®

[App page](https://appshunter.io/ios/app/td-snap/id1072799231)

This communication software assists individuals with speech and language disabilities by offering symbol-supported and text-based communication options. It features customizable page sets and editing tools, accessible via touch, eye gaze, and switch access. A subscription is required after a trial period.

**Highlights:** Symbol-supported and text-based page sets, Customizable editing tools, Touch, eye gaze, and switch access, Picture Communication Symbols library, Visual schedules and timers, Cloud-based content syncing

**Features:** Family Sharing

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gateway Monthly | $4.99 | per month |
| PODD Monthly | $4.99 | per month |
| Metacom Monthly | $4.99 | per month |
| Speaking Upgrade Monthly | $9.99 | per month |
| Acapela Voices | $39.99 | one-time |
| Nuance Voices | $39.99 | one-time |
| Speaking Upgrade | $49.99 | one-time |
| METACOM Symbols | $49.99 | one-time |
| PODD Page Sets | $149.99 | one-time |
| Gateway Page Sets | $149.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 👍 Customizable
- 🚀 Intuitive navigation
- 👍 Helpful supports and features
- 🚀 Flexible and robust

**What reviewers complain about**

- 🔒 Subscription model for voice
- 🐛 Voice issues after updates
- 💰 Expensive subscription
- 🔒 Removing previously paid features
- 🐛 Crashes and bugs

**Reported bugs**

- Voice disappearing after updates
- Crashes on launch
- Incompatibility with iPad Pro
- Inability to restore purchased content

**Requested features**

- Ability to change undo symbol
- Link to ACCIL image database
- Ability to set user age for appropriate vocabulary
- More robust core vocabulary
- Easier grammar modeling


## Frequently asked questions

### Is SpectrumView free?

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

### Is TD Snap® free?

TD Snap® is free to download, with in-app purchases available.

### Which has better reviews, SpectrumView or TD Snap®?

TD Snap® is rated higher. SpectrumView averages 3.1 out of 5 from 74 ratings, while TD Snap® averages 4.2 from 810 ratings.

### Do SpectrumView or TD Snap® have ads?

Neither SpectrumView nor TD Snap® shows ads.

### Which is updated more often, SpectrumView or TD Snap®?

SpectrumView ships an update every 10 months, and TD Snap® every 2 months. Most recently, SpectrumView was updated on September 21, 2026 and TD Snap® on September 26, 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.*