# GPT.Zero vs Fiber Optic Color Code Lookup

The clearest difference is device support: Fiber Optic Color Code Lookup at 3 against GPT.Zero's 1. Fiber Optic Color Code Lookup also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. GPT.Zero sells 3 in-app purchases, starting at $6.99 per 7 days and Fiber Optic Color Code Lookup sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

GPT.Zero ships an update every 2 months, Fiber Optic Color Code Lookup monthly. Both last shipped on November 5, 2026.

## The numbers

| Metric | GPT.Zero | Fiber Optic Color Code Lookup |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (75 ratings)](https://appshunter.io/ios/app/gptzero-ai-undetectable-tool/id6756034715/reviews)** | — |
| Number of ratings | **75** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Subscription | — |
| Size | 2 MB | 52 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [俊 郭](https://appshunter.io/developer/6780973356) | [AllFiber](https://appshunter.io/developer/1892887885) |

## What reviewers say

### GPT.Zero

[App page](https://appshunter.io/ios/app/gptzero-ai-undetectable-tool/id6756034715)

Detect AI-generated text and refine your writing to sound more natural. This tool supports various content types and offers quick scanning with history saving. Achieve polished, human-like prose with confidence.

**Highlights:** Multiple AI detectors, Supports all writing types, Quick and easy scanning, Human-like style adjustment, Saved history of checks

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TextLens Plans Weekly | $6.99 | per 7 days |
| TextLens Plans Monthly | $17.99 | per month |
| TextLens Plans Yearly | $59.99 | per year |


### Fiber Optic Color Code Lookup

[App page](https://appshunter.io/ios/app/fiber-optic-color-code-lookup/id6762096604)

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

**In-app purchases (1)**

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


## Frequently asked questions

### Is GPT.Zero free?

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

### Is Fiber Optic Color Code Lookup free?

Fiber Optic Color Code Lookup is free to download, with in-app purchases available.

### Do GPT.Zero or Fiber Optic Color Code Lookup have ads?

Neither GPT.Zero nor Fiber Optic Color Code Lookup shows ads.

### Which is updated more often, GPT.Zero or Fiber Optic Color Code Lookup?

GPT.Zero ships an update every 2 months, and Fiber Optic Color Code Lookup monthly. Most recently, GPT.Zero was updated on November 5, 2026 and Fiber Optic Color Code Lookup on November 5, 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.*