# InvoiceZap vs PreventivOk

The clearest difference is update cadence: InvoiceZap at every 4 days against PreventivOk's fortnightly. PreventivOk's advantage is iOS requirement (16.6 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. InvoiceZap sells 2 in-app purchases, starting at $9.99 per month and PreventivOk sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

InvoiceZap ships an update every 4 days, PreventivOk fortnightly. The most recent releases landed on October 26, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | InvoiceZap | PreventivOk |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Fortnightly |
| Monetization | Subscription | — |
| Size | 24 MB | 45 MB |
| Requires iOS | 18.0 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Fancygames, Ltd.](https://appshunter.io/developer/355409981) | [Antonio Augello](https://appshunter.io/developer/1844412810) |

## What reviewers say

### InvoiceZap

[App page](https://appshunter.io/ios/app/invoicezap-invoice-maker/id6746954530)

Create professional, branded invoices and estimates quickly for your service business. Manage clients, send documents via multiple channels, and track estimate approvals. Get paid faster with a polished, credible appearance.

**Highlights:** Branded invoice and estimate creation, Client database and management, Convert estimates to invoices, Send documents via email, text, AirDrop, Multi-currency and tax support, Professional PDF export, iCloud sync across devices

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| InvoiceZap Pro | $9.99 | per month |
| InvoiceZap Pro | $69.99 | per year |


### PreventivOk

[App page](https://appshunter.io/ios/app/preventivok/id6753686989)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advanced | $2.99 | per month |
| Premium | $4.99 | per month |


## Frequently asked questions

### Is InvoiceZap free?

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

### Is PreventivOk free?

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

### Do InvoiceZap or PreventivOk have ads?

Neither InvoiceZap nor PreventivOk shows ads.

### Which is updated more often, InvoiceZap or PreventivOk?

InvoiceZap ships an update every 4 days, and PreventivOk fortnightly. Most recently, InvoiceZap was updated on October 26, 2026 and PreventivOk on October 12, 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.*