# Thinklet vs STL Viewer

The clearest difference is ads: Thinklet at none against STL Viewer's shown. STL Viewer's advantage is update cadence (fortnightly vs every 2 months) and iOS requirement (15.0 vs 26.2). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Thinklet sells 4 in-app purchases, starting at $4.99 per month and STL Viewer sells 8 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Thinklet ships an update every 2 months, STL Viewer fortnightly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Thinklet | STL Viewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Fortnightly** |
| Size | 8 MB | 48 MB |
| Requires iOS | 26.2 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [洋 张](https://appshunter.io/developer/1809078958) | [Sahana A S](https://appshunter.io/developer/1800491118) |

## What reviewers say

### Thinklet

[App page](https://appshunter.io/ios/app/thinklet-ai-chat-client/id6761720405)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Starter | $4.99 | per month |
| Basic | $9.99 | per month |
| Pro | $19.99 | per month |
| Max | $49.99 | per month |


### STL Viewer

[App page](https://appshunter.io/ios/app/stl-viewer-3d-print-and-g-code/id6813788641)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LayerPeek Pro Monthly | $1.99 | per month |
| Pro Lifetime Limited Offer | $5.99 | one-time |
| Pro Lifetime Limited Offer | $7.99 | one-time |
| Pro Lifetime Limited Offer | $9.99 | one-time |
| Pro Lifetime Limited Offer | $11.99 | one-time |
| Pro Lifetime Limited Offer | $13.99 | one-time |
| Pro Lifetime Limited Offer | $15.99 | one-time |
| LayerPeek Pro Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Thinklet free?

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

### Is STL Viewer free?

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

### Do Thinklet or STL Viewer have ads?

STL Viewer shows ads; Thinklet does not.

### Which is updated more often, Thinklet or STL Viewer?

Thinklet ships an update every 2 months, and STL Viewer fortnightly. Most recently, Thinklet was updated on October 24, 2026 and STL Viewer on October 24, 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.*