# Questi vs PDF Grader PRO

The clearest difference is price: Questi at Free against PDF Grader PRO's $4.99. Questi also leads on ads (none vs shown) and iOS requirement (15.1 vs 17.6). PDF Grader PRO's advantage is update cadence (every 3 days vs weekly). On in-app purchases and device support there is nothing between them.

Questi is free to download; PDF Grader PRO costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Questi ships an update weekly, PDF Grader PRO every 3 days. Both last shipped on October 7, 2026.

## The numbers

| Metric | Questi | PDF Grader PRO |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Positive reviews | 83.9% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Weekly | **Every 3 days** |
| Monetization | Free | — |
| Size | 14 MB | 12 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bnz Inc](https://appshunter.io/developer/1602520806) | [Hyeonchan Yu](https://appshunter.io/developer/1857516231) |

## What reviewers say

### Questi

[App page](https://appshunter.io/ios/app/questi-ai-problem-solver/id6736639784)

This AI-powered app provides clear explanations for complex problems across all academic levels, from elementary to university. It helps users understand the essence of problems, maximize learning efficiency, and offers accessibility on multiple devices.

**Highlights:** AI-powered explanations, Covers all academic levels, In-depth understanding, Maximize learning efficiency, Accessible on PC, tablet, smartphone

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

**In-app purchases:** none


### PDF Grader PRO

[App page](https://appshunter.io/ios/app/pdf-grader-pro/id6755943630)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Questi free?

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

### Is PDF Grader PRO free?

PDF Grader PRO costs $4.99, with no in-app purchases.

### Do Questi or PDF Grader PRO have ads?

PDF Grader PRO shows ads; Questi does not.

### Which is updated more often, Questi or PDF Grader PRO?

Questi ships an update weekly, and PDF Grader PRO every 3 days. Most recently, Questi was updated on October 7, 2026 and PDF Grader PRO on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*