# Invoice Maker Estimate BillKit vs SimpleStock

The clearest difference is update cadence: Invoice Maker Estimate BillKit at every 2 days against SimpleStock's every 3 weeks. SimpleStock's advantage is iOS requirement (15.6 vs 18.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Invoice Maker Estimate BillKit sells 3 in-app purchases, starting at $7.99 per 7 days and SimpleStock sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Invoice Maker Estimate BillKit ships an update every 2 days, SimpleStock every 3 weeks. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Invoice Maker Estimate BillKit | SimpleStock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/invoice-maker-estimate-billkit/id6755629738/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 18 MB | 32 MB |
| Requires iOS | 18.5 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Beemur](https://appshunter.io/developer/1808349896) | [Quach Bao Chau](https://appshunter.io/developer/1320550154) |

## What reviewers say

### Invoice Maker Estimate BillKit

[App page](https://appshunter.io/ios/app/invoice-maker-estimate-billkit/id6755629738)

This app helps freelancers and small business owners create professional invoices, estimates, and bills quickly. It offers modern templates, client management, payment tracking, and optional AI tools to streamline workflows and ensure timely payments.

**Highlights:** Create professional invoices and estimates, Instant PDF exports, Client management, Payment tracking, AI-powered tools, Modern, customizable templates, Save reusable item templates

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bill Kit Weekly | $7.99 | per 7 days |
| Bill Kit Yearly | $34.99 | per year |
| Bill Kit Lifetime | $79.99 | one-time |


### SimpleStock

[App page](https://appshunter.io/ios/app/simplestock-inventory-tracker/id6789872814)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $1.99 | per month |
| Pro Annual | $4.99 | per year |
| Lifetime Unlock | $4.99 | one-time |


## Frequently asked questions

### Is Invoice Maker Estimate BillKit free?

Invoice Maker Estimate BillKit is free to download, with in-app purchases available.

### Is SimpleStock free?

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

### Do Invoice Maker Estimate BillKit or SimpleStock have ads?

Neither Invoice Maker Estimate BillKit nor SimpleStock shows ads.

### Which is updated more often, Invoice Maker Estimate BillKit or SimpleStock?

Invoice Maker Estimate BillKit ships an update every 2 days, and SimpleStock every 3 weeks. Most recently, Invoice Maker Estimate BillKit was updated on October 24, 2026 and SimpleStock on October 16, 2026.

---

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