# Spectrolite vs 99 Forward

The clearest difference is in-app purchases: 99 Forward at none against Spectrolite's 1. 99 Forward also leads on review sentiment (100% vs 83%) and update cadence (every 4 months vs every 8 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Spectrolite sells 1 one-off in-app purchase. 99 Forward asks for nothing beyond the download.

Spectrolite ships an update every 8 months, 99 Forward every 4 months. The most recent releases landed on October 30, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Spectrolite | 99 Forward |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (65 ratings)](https://appshunter.io/ios/app/spectrolite/id1480240180/reviews)** | — |
| Number of ratings | **65** | — |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 1 MB | 62 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Waxing Wave](https://appshunter.io/developer/392942046) | [Narendra Yadav](https://appshunter.io/developer/1475064845) |

## What reviewers say

### Spectrolite

[App page](https://appshunter.io/ios/app/spectrolite/id1480240180)

This app visualizes sound in real-time using various spectrogram types. Explore detailed audio data with intuitive touch controls and adjustable parameters. An optional purchase unlocks advanced measurement tools.

**Highlights:** Real-time spectrogram visualization, Constant-Q, linear, and mel frequency scales, Full human hearing frequency range, Intuitive touch panning and zooming, Adjustable gain, Q, and other parameters, Pro version: grids, scales, spectrum view, tap-to-measure

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $4.99 | one-time |


### 99 Forward

[App page](https://appshunter.io/ios/app/99-forward-ai-card-scanner/id6758335163)

Digitize business cards instantly with AI-powered OCR technology. Capture names, contact details, and company information to save as digital contacts, streamlining networking and organization for professionals.

**Highlights:** AI-powered business card scanning, Fast OCR for contact extraction, Automatic data capture, Save scanned info as digital contacts, Reduce manual data entry, Organize professional contacts

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

**In-app purchases:** none


## Frequently asked questions

### Is Spectrolite free?

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

### Is 99 Forward free?

99 Forward is free to download, with no in-app purchases.

### Do Spectrolite or 99 Forward have ads?

Neither Spectrolite nor 99 Forward shows ads.

### Which is updated more often, Spectrolite or 99 Forward?

Spectrolite ships an update every 8 months, and 99 Forward every 4 months. Most recently, Spectrolite was updated on October 30, 2026 and 99 Forward on October 17, 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.*