# Plottron vs Spectrolite

The clearest difference is in-app purchases: Plottron at none against Spectrolite's 1. Plottron also leads on update cadence (every 2 months vs every 8 months) and review sentiment (100% vs 83%). Spectrolite's advantage is ratings volume (51 vs 12). On price, rating, ads and device support there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.8 for Plottron against 4.8 for Spectrolite. Both are backed by a comparable volume of ratings — 12 and 51 respectively. Written reviews are what separate them: 100% of Plottron's written reviews are positive against 83% of Spectrolite's.

Plottron ships an update every 2 months, Spectrolite every 8 months. The most recent releases landed on October 1, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Plottron | Spectrolite |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (12 ratings)](https://appshunter.io/ios/app/plottron/id1037723649/reviews) | [4.8 (51 ratings)](https://appshunter.io/ios/app/spectrolite/id1480240180/reviews) |
| Number of ratings | 12 | **51** |
| Positive reviews | **100.0% of reviews** | 83.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 8 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 1 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Billy Lin](https://appshunter.io/developer/1037723648) | [Waxing Wave](https://appshunter.io/developer/392942046) |

## What reviewers say

### Plottron

[App page](https://appshunter.io/ios/app/plottron/id1037723649)

This application offers advanced 2D and 3D graphing capabilities for various function types, alongside a comprehensive scientific calculator. It supports implicit graphing, complex number visualization, and symbolic differentiation. The calculator includes user-defined variables, live evaluation, and probability density functions.

**Highlights:** 2D and 3D graphing, Implicit graphing, Complex number visualization, Symbolic differentiation, User-defined variables and functions, Live evaluation, Calculation history

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

**In-app purchases:** none


### 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

**In-app purchases (1)**

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


## Frequently asked questions

### Is Plottron free?

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

### Is Spectrolite free?

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

### Which has better reviews, Plottron or Spectrolite?

Plottron and Spectrolite are both rated 4.8 out of 5 on the App Store, from 12 and 51 ratings respectively.

### Do Plottron or Spectrolite have ads?

Neither Plottron nor Spectrolite shows ads.

### Which is updated more often, Plottron or Spectrolite?

Plottron ships an update every 2 months, and Spectrolite every 8 months. Most recently, Plottron was updated on October 1, 2026 and Spectrolite on September 23, 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.*