# BigPay App vs AIChatDoo

The clearest difference is in-app purchases: BigPay App at none against AIChatDoo's 3. BigPay App also leads on iOS requirement (12.0 vs 15.0). AIChatDoo's advantage is ads (none vs shown) and update cadence (every 5 days vs every 6 weeks). On price and device support there is nothing between them.

Both are free to download. AIChatDoo sells 3 in-app purchases, starting at $3.99 per 7 days. BigPay App asks for nothing beyond the download.

BigPay App ships an update every 6 weeks, AIChatDoo every 5 days. The most recent releases landed on September 24, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | BigPay App | AIChatDoo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 5 days** |
| Size | 59 MB | 9 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Platinum Easy Solutions Ltd](https://appshunter.io/developer/1576548845) | [NovaMind AI](https://appshunter.io/developer/1837941195) |

## What reviewers say

### BigPay App

[App page](https://appshunter.io/ios/app/bigpay-app/id6752673573)

**Features:** macOS Compatibility

**In-app purchases:** none


### AIChatDoo

[App page](https://appshunter.io/ios/app/aichatdoo-write-think-create/id6777403201)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| week membership | $3.99 | per 7 days |
| year membership | $14.99 | per year |
| lifetime membership | $19.99 | one-time |


## Frequently asked questions

### Is BigPay App free?

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

### Is AIChatDoo free?

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

### Do BigPay App or AIChatDoo have ads?

BigPay App shows ads; AIChatDoo does not.

### Which is updated more often, BigPay App or AIChatDoo?

BigPay App ships an update every 6 weeks, and AIChatDoo every 5 days. Most recently, BigPay App was updated on September 24, 2026 and AIChatDoo on September 25, 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.*