# Kain vs Invoice Maker and Estimates ⁺

The clearest difference is in-app purchases: Kain at none against Invoice Maker and Estimates ⁺'s 2. Kain also leads on device support (3 vs 1). Invoice Maker and Estimates ⁺'s advantage is update cadence (every 4 days vs every 3 months). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Invoice Maker and Estimates ⁺ sells 2 in-app purchases, starting at $4.99 per 7 days. Kain asks for nothing beyond the download.

Kain ships an update every 3 months, Invoice Maker and Estimates ⁺ every 4 days. The most recent releases landed on October 14, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Kain | Invoice Maker and Estimates ⁺ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Size | 74 MB | 7 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [ICAMOB](https://appshunter.io/developer/1604179286) | [APPALACHIAN INDUSTRIAL SERVICES LLC](https://appshunter.io/developer/1850447814) |

## What reviewers say

### Kain

[App page](https://appshunter.io/ios/app/kain/id6502196524)

**Features:** macOS Compatibility

**In-app purchases:** none


### Invoice Maker and Estimates ⁺

[App page](https://appshunter.io/ios/app/invoice-maker-and-estimates/id6757754956)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Weekly Trial | $4.99 | per 7 days |


## Frequently asked questions

### Is Kain free?

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

### Is Invoice Maker and Estimates ⁺ free?

Invoice Maker and Estimates ⁺ is free to download, with in-app purchases available.

### Do Kain or Invoice Maker and Estimates ⁺ have ads?

Neither Kain nor Invoice Maker and Estimates ⁺ shows ads.

### Which is updated more often, Kain or Invoice Maker and Estimates ⁺?

Kain ships an update every 3 months, and Invoice Maker and Estimates ⁺ every 4 days. Most recently, Kain was updated on October 14, 2026 and Invoice Maker and Estimates ⁺ on October 9, 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.*