# ModTest Pro vs Vector Space AI

The clearest difference is price: Vector Space AI at Free against ModTest Pro's $9.99. Vector Space AI also leads on update cadence (every 4 days vs every 2 months). ModTest Pro's advantage is iOS requirement (13.0 vs 18.0). On ads, in-app purchases and device support there is nothing between them.

Vector Space AI is free to download; ModTest Pro costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ModTest Pro ships an update every 2 months, Vector Space AI every 4 days. The most recent releases landed on September 8, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | ModTest Pro | Vector Space AI |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | — | Free |
| Size | 26 MB | 34 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dohmann Engineering Services](https://appshunter.io/developer/401682475) | [Voila Tech K.K](https://appshunter.io/developer/1769335627) |

## What reviewers say

### ModTest Pro

[App page](https://appshunter.io/ios/app/modtest-pro/id1552784932)

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

**In-app purchases:** none


### Vector Space AI

[App page](https://appshunter.io/ios/app/vector-space-ai/id6746352865)

This app offers a fast, private AI companion that runs locally on your device, providing instant responses for writing, brainstorming, and coding. It also allows seamless switching to cloud-based AI for more advanced queries.

**Highlights:** Runs locally on device, Optional ChatGPT API connection, Modern and clean interface, Instant response times, Complete user data privacy, Seamless mode switching

**Features:** Safari Extension

**In-app purchases:** none


## Frequently asked questions

### Is ModTest Pro free?

ModTest Pro costs $9.99, with no in-app purchases.

### Is Vector Space AI free?

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

### Do ModTest Pro or Vector Space AI have ads?

Neither ModTest Pro nor Vector Space AI shows ads.

### Which is updated more often, ModTest Pro or Vector Space AI?

ModTest Pro ships an update every 2 months, and Vector Space AI every 4 days. Most recently, ModTest Pro was updated on September 8, 2026 and Vector Space AI on September 7, 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.*