# BookB vs Invoice Simple

The clearest difference is in-app purchases: BookB at none against Invoice Simple's 2. Invoice Simple's advantage is update cadence (every 5 days vs every 4 months) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Invoice Simple sells 2 in-app purchases, starting at $6.99 per 7 days. BookB asks for nothing beyond the download.

BookB ships an update every 4 months, Invoice Simple every 5 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | BookB | Invoice Simple |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/invoice-simple-estimate-app/id6760185558/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 34 MB | 120 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [THE ALGORITHM LLC](https://appshunter.io/developer/1285511084) | [Alpeshbhai Dungrani](https://appshunter.io/developer/1870178939) |

## What reviewers say

### BookB

[App page](https://appshunter.io/ios/app/bookb/id1626108788)

**Features:** macOS Compatibility

**In-app purchases:** none


### Invoice Simple

[App page](https://appshunter.io/ios/app/invoice-simple-estimate-app/id6760185558)

Create professional invoices, estimates, and receipts quickly. Manage clients, track payments, and generate reports to understand business performance. Supports multiple businesses and offers customization options.

**Highlights:** Create professional invoices and estimates, Manage client contact details, Track payments and overdue invoices, Generate revenue and sales reports, Support for multiple businesses, Customizable invoice templates, Automated payment reminders

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $6.99 | per 7 days |
| Weekly Subscription | $6.99 | per 7 days |


## Frequently asked questions

### Is BookB free?

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

### Is Invoice Simple free?

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

### Do BookB or Invoice Simple have ads?

Neither BookB nor Invoice Simple shows ads.

### Which is updated more often, BookB or Invoice Simple?

BookB ships an update every 4 months, and Invoice Simple every 5 days. Most recently, BookB was updated on October 30, 2026 and Invoice Simple on November 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*