# AP Study vs Paid. Invoice & estimate maker

The clearest difference is in-app purchases: AP Study at none against Paid. Invoice & estimate maker's 4. AP Study also leads on iOS requirement (13.0 vs 17.0). Paid. Invoice & estimate maker's advantage is update cadence (monthly vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Paid. Invoice & estimate maker sells 4 in-app purchases, starting at $1.99 per 7 days. AP Study asks for nothing beyond the download.

AP Study ships an update every 3 months, Paid. Invoice & estimate maker monthly. The most recent releases landed on October 14, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | AP Study | Paid. Invoice & estimate maker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Size | 80 MB | 19 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kantar](https://appshunter.io/developer/948624774) | [Agado Apps Pty Limited](https://appshunter.io/developer/902292213) |

## What reviewers say

### AP Study

[App page](https://appshunter.io/ios/app/ap-study/id1180019072)

**Features:** macOS Compatibility

**In-app purchases:** none


### Paid. Invoice & estimate maker

[App page](https://appshunter.io/ios/app/paid-invoice-and-estimate-maker/id1638579507)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Invoicing | $1.99 | per 7 days |
| Monthly Invoicing | $6.99 | per month |
| 3 Month Premium Invoicing | $17.99 | per 3 months |
| Annual Invoicing | $59.99 | per year |


## Frequently asked questions

### Is AP Study free?

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

### Is Paid. Invoice & estimate maker free?

Paid. Invoice & estimate maker is free to download, with in-app purchases available.

### Do AP Study or Paid. Invoice & estimate maker have ads?

Neither AP Study nor Paid. Invoice & estimate maker shows ads.

### Which is updated more often, AP Study or Paid. Invoice & estimate maker?

AP Study ships an update every 3 months, and Paid. Invoice & estimate maker monthly. Most recently, AP Study was updated on October 14, 2026 and Paid. Invoice & estimate maker on October 5, 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.*