# Optogenetics Pro vs Silter

The clearest difference is rating: Optogenetics Pro at 5.0 against Silter's 3.3. Optogenetics Pro also leads on in-app purchases (none vs 6) and device support (3 vs 1). Silter's advantage is update cadence (every 4 weeks vs every 45 months). On price, ratings volume, ads and iOS requirement there is nothing between them.

Both are free to download. Silter sells 6 in-app purchases, starting at $4.99 per 7 days. Optogenetics Pro asks for nothing beyond the download.

Optogenetics Pro holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

Optogenetics Pro ships an update every 45 months, Silter every 4 weeks. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Optogenetics Pro | Silter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/optogenetics-pro/id641358148/reviews)** | [3.3 (4 ratings)](https://appshunter.io/ios/app/silter-sms-spam-blocker/id6466715635/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 45 months | **Every 4 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 365 MB | 81 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Popneuron Ltd.](https://appshunter.io/developer/569968720) | [Yusuf Demirci](https://appshunter.io/developer/1668297071) |

## What reviewers say

### Optogenetics Pro

[App page](https://appshunter.io/ios/app/optogenetics-pro/id641358148)

This tool helps researchers calculate the necessary optical power for optogenetics experiments involving light delivery to deep brain areas. It considers brain region scattering properties, opsin type, and optical fiber characteristics to estimate excitation depth as a function of optical power.

**Highlights:** Calculate required optical power, Estimate opsin excitation depth, Model light scattering in brain tissue, Input brain region properties, Input opsin properties, Input optical fiber properties

**Features:** macOS Compatibility

**In-app purchases:** none


### Silter

[App page](https://appshunter.io/ios/app/silter-sms-spam-blocker/id6466715635)

This app uses AI to automatically detect and block unwanted SMS messages, such as scams and ads. It offers country-specific protection and allows users to create custom blocking rules while ensuring complete privacy by processing all data locally on the device.

**Highlights:** AI-powered spam detection, Country and region-based protection, Customizable filter rules, 100% privacy-first, local processing, Ad-free experience, Lightweight and easy to use

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | per 7 days |
| Premium | $9.99 | per month |
| Premium Access | $9.99 | per 7 days |
| Premium Access | $9.99 | per 7 days |
| Premium | $19.99 | per year |
| Premium yearly with trial | $49.99 | per year |


## Frequently asked questions

### Is Optogenetics Pro free?

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

### Is Silter free?

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

### Which has better reviews, Optogenetics Pro or Silter?

Optogenetics Pro is rated higher. Optogenetics Pro averages 5.0 out of 5 from 2 ratings, while Silter averages 3.3 from 4 ratings.

### Do Optogenetics Pro or Silter have ads?

Neither Optogenetics Pro nor Silter shows ads.

### Which is updated more often, Optogenetics Pro or Silter?

Optogenetics Pro ships an update every 45 months, and Silter every 4 weeks. Most recently, Optogenetics Pro was updated on October 7, 2026 and Silter on October 25, 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.*