# STL Viewer vs Call Scheduler

The clearest difference is price: Call Scheduler at Free against STL Viewer's $0.99. Call Scheduler also leads on update cadence (weekly vs every 4 weeks) and iOS requirement (15.6 vs 17.0). STL Viewer's advantage is ads (none vs shown). On rating, ratings volume, in-app purchases and device support there is nothing between them.

Call Scheduler is free to download; STL Viewer costs $0.99 up front. STL Viewer sells 5 in-app purchases, starting at $2.99 per month and Call Scheduler sells 1 in-app purchase, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for STL Viewer against 5.0 for Call Scheduler. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

STL Viewer ships an update every 4 weeks, Call Scheduler weekly. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | STL Viewer | Call Scheduler |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/stl-viewer-3d-mesh/id6445801487/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/call-scheduler/id6756841097/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 weeks | **Weekly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 5 MB | 54 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Felipe Marques de Barros](https://appshunter.io/developer/1459294806) | [Seiya.k](https://appshunter.io/developer/383021944) |

## What reviewers say

### STL Viewer

[App page](https://appshunter.io/ios/app/stl-viewer-3d-mesh/id6445801487)

View, explore, and edit 3D models on your iPhone or iPad. Basic viewing is included with purchase, with optional upgrades for advanced creation, editing, and reporting features. Models are processed locally for privacy.

**Highlights:** Open and view STL files, Rotate, pan, and zoom models, Basic model information inspection, Create and edit 3D models, Measure distances and angles, Export to multiple file formats, Generate local PDF reports

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| STL Viewer Pro Mensal | $2.99 | per month |
| STL Viewer Studio Mensal | $5.99 | per month |
| STL Viewer Pro Anual | $22.99 | per year |
| STL Viewer Studio Anual | $49.99 | per year |
| STL Viewer Pro Vitalício | $39.99 | one-time |


### Call Scheduler

[App page](https://appshunter.io/ios/app/call-scheduler/id6756841097)

Never forget important phone calls again. This app provides timely reminders for scheduled calls, allowing you to initiate the call with a single tap. It helps manage callbacks, appointment confirmations, and daily important calls.

**Highlights:** Schedule phone calls with reminders, Initiate calls with a single tap, Select numbers from contacts, Edit and manage scheduled calls, Simple call preparation screen, Call history (Pro version), Reusable call templates (Pro version)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Yearly Plan | $9.99 | per year |


## Frequently asked questions

### Is STL Viewer free?

STL Viewer costs $0.99, and also offers in-app purchases.

### Is Call Scheduler free?

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

### Which has better reviews, STL Viewer or Call Scheduler?

STL Viewer and Call Scheduler are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do STL Viewer or Call Scheduler have ads?

Call Scheduler shows ads; STL Viewer does not.

### Which is updated more often, STL Viewer or Call Scheduler?

STL Viewer ships an update every 4 weeks, and Call Scheduler weekly. Most recently, STL Viewer was updated on November 7, 2026 and Call Scheduler on October 31, 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.*