# Shield vs Nasu

The clearest difference is price: Nasu at Free against Shield's $0.99. Nasu also leads on iOS requirement (17.5 vs 26.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Nasu is free to download; Shield costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Shield ships an update every 3 weeks, Nasu fortnightly. The most recent releases landed on September 14, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Shield | Nasu |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.4 (8 ratings)](https://appshunter.io/ios/app/shield-spam-text-filter/id6503194185/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 90.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Paid | — |
| Size | 8 MB | 9 MB |
| Requires iOS | 26.0 | **17.5** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TRILLIWON, Co.](https://appshunter.io/developer/1050731374) | [Zebel OU](https://appshunter.io/developer/882509165) |

## What reviewers say

### Shield

[App page](https://appshunter.io/ios/app/shield-spam-text-filter/id6503194185)

This utility app uses AI to filter and categorize SMS messages, blocking spam and organizing your inbox. It offers customizable filters and a privacy-first approach to keep your communications clean and secure.

**Highlights:** AI-driven spam filtering, Privacy-first data handling, Unlimited customizable filters, Intelligent message categorization, Easy setup and user-friendly interface

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

**In-app purchases:** none


### Nasu

[App page](https://appshunter.io/ios/app/nasu-therapy-session-notes/id6677000272)

**In-app purchases:** none


## Frequently asked questions

### Is Shield free?

Shield costs $0.99, with no in-app purchases.

### Is Nasu free?

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

### Do Shield or Nasu have ads?

Neither Shield nor Nasu shows ads.

### Which is updated more often, Shield or Nasu?

Shield ships an update every 3 weeks, and Nasu fortnightly. Most recently, Shield was updated on September 14, 2026 and Nasu on September 11, 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.*