# Knowledge Robo vs Instant Doc

The clearest difference is in-app purchases: Instant Doc at none against Knowledge Robo's 2. Knowledge Robo's advantage is ads (none vs shown) and iOS requirement (13.0 vs 15.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Knowledge Robo sells 2 one-off in-app purchases. Instant Doc asks for nothing beyond the download.

Knowledge Robo ships an update weekly, Instant Doc every 8 days. The most recent releases landed on November 3, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Knowledge Robo | Instant Doc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/knowledge-robo-ai-chat/id6449212253/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 8 days |
| Monetization | Free | — |
| Size | 67 MB | 133 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Shashi Gupta](https://appshunter.io/developer/1688140059) | [Axel FLEURY](https://appshunter.io/developer/1561932445) |

## What reviewers say

### Knowledge Robo

[App page](https://appshunter.io/ios/app/knowledge-robo-ai-chat/id6449212253)

This AI-powered assistant uses advanced models to answer questions, generate images, and assist with writing tasks. It supports multiple languages and offers organized conversations for a streamlined user experience.

**Highlights:** AI Chat with GPT and Gemini, AI Image Generation, Voice Input for AI Responses, Organized Conversations, Multi-language Support, Export and Share Conversations, AI Writing Assistance

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coins Basic | $0.99 | one-time |
| Coins Premium | $1.99 | one-time |


### Instant Doc

[App page](https://appshunter.io/ios/app/instant-doc-pdf-scanner/id6761603073)

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

**In-app purchases:** none


## Frequently asked questions

### Is Knowledge Robo free?

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

### Is Instant Doc free?

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

### Do Knowledge Robo or Instant Doc have ads?

Instant Doc shows ads; Knowledge Robo does not.

### Which is updated more often, Knowledge Robo or Instant Doc?

Knowledge Robo ships an update weekly, and Instant Doc every 8 days. Most recently, Knowledge Robo was updated on November 3, 2026 and Instant Doc on October 28, 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.*