# Foxstack AI vs AI Agent Builder

The clearest difference is price: Foxstack AI at Free against AI Agent Builder's $2.99. Foxstack AI also leads on update cadence (every 2 days vs every 10 days). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Foxstack AI is free to download; AI Agent Builder costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Foxstack AI ships an update every 2 days, AI Agent Builder every 10 days. The most recent releases landed on October 6, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Foxstack AI | AI Agent Builder |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 10 days |
| Size | 3 MB | 6 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Meridio](https://appshunter.io/developer/1836499552) | [Yuhsiu Lai](https://appshunter.io/developer/433114647) |

## What reviewers say

### Foxstack AI

[App page](https://appshunter.io/ios/app/foxstack-ai/id6760570536)

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

**In-app purchases:** none


### AI Agent Builder

[App page](https://appshunter.io/ios/app/ai-agent-builder-create-agent/id6762403953)

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

**In-app purchases:** none


## Frequently asked questions

### Is Foxstack AI free?

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

### Is AI Agent Builder free?

AI Agent Builder costs $2.99, with no in-app purchases.

### Do Foxstack AI or AI Agent Builder have ads?

Neither Foxstack AI nor AI Agent Builder shows ads.

### Which is updated more often, Foxstack AI or AI Agent Builder?

Foxstack AI ships an update every 2 days, and AI Agent Builder every 10 days. Most recently, Foxstack AI was updated on October 6, 2026 and AI Agent Builder on October 19, 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.*