# Invoice 4all, Estimate Maker vs OS Inventory

The clearest difference is in-app purchases: OS Inventory at none against Invoice 4all, Estimate Maker's 10. Invoice 4all, Estimate Maker's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 16.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Invoice 4all, Estimate Maker sells 10 in-app purchases, starting at $1.99 per month. OS Inventory asks for nothing beyond the download.

Invoice 4all, Estimate Maker ships an update every 2 months, OS Inventory every 5 weeks. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Invoice 4all, Estimate Maker | OS Inventory |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (70 ratings)](https://appshunter.io/ios/app/invoice-4all-estimate-maker/id1023160207/reviews)** | — |
| Number of ratings | **70** | — |
| Positive reviews | 90.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 26 MB | 2 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [GLOBALTEK SOLUTION UK LTD](https://appshunter.io/developer/1023160206) | [OPENSCREEN INC.](https://appshunter.io/developer/1648762695) |

## What reviewers say

### Invoice 4all, Estimate Maker

[App page](https://appshunter.io/ios/app/invoice-4all-estimate-maker/id1023160207)

Create, send, and track invoices, estimates, and expenses on your mobile device. Keep your finances organized with secure cloud storage and automatic syncing across devices. Manage products, customers, and payments efficiently.

**Highlights:** Create and send invoices and estimates, Manage expenses and receipts, Add customers and products on the fly, Mark invoices as paid/unpaid, Search and email invoices/expenses, Professional invoice templates, Reverse Charge Invoice support

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard - Monthly Renewable | $1.99 | per month |
| Enterprise- Monthly Renewable | $2.99 | per month |
| Ultimate - Monthly Renewable | $4.99 | per month |
| UltimatePlus Monthly Renewable | $6.99 | per month |
| Standard - Yearly Renewable | $14.99 | per year |
| Enterprise - Yearly Renewable | $29.99 | per year |
| Ultimate- Yearly Renewable | $49.99 | per year |
| UnlimitedPlus-Yearly Renewable | $79.99 | per year |
| Standard 1 Year Non Renewing | $7.99 | one-time |
| Enterprise 1 Year Non Renewing | $9.99 | one-time |

**What reviewers like**

- 👍 Easy to use and operate
- 💰 Cheapest and affordable
- 🚀 Efficient for organizing invoices
- 💡 Developers listen to requests
- 💬 Excellent customer support

**What reviewers complain about**

- 🐛 Email not working
- 🐛 Login issues
- 🐛 Date glitch on invoices
- 🐛 No receipt option
- 🐛 Server down issues

**Reported bugs**

- Email portion non-functional
- Cannot send emails to self or clients
- Server has been down for a week
- App will not let me log in
- Problem using email system for automatic copy

**Requested features**

- New invoice option that pops up blank
- Estimates able to transfer to invoicing
- Support for Spanish language
- Export contacts
- Save all settings


### OS Inventory

[App page](https://appshunter.io/ios/app/os-inventory/id6449221496)

**In-app purchases:** none


## Frequently asked questions

### Is Invoice 4all, Estimate Maker free?

Invoice 4all, Estimate Maker is free to download, with in-app purchases available.

### Is OS Inventory free?

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

### Do Invoice 4all, Estimate Maker or OS Inventory have ads?

Neither Invoice 4all, Estimate Maker nor OS Inventory shows ads.

### Which is updated more often, Invoice 4all, Estimate Maker or OS Inventory?

Invoice 4all, Estimate Maker ships an update every 2 months, and OS Inventory every 5 weeks. Most recently, Invoice 4all, Estimate Maker was updated on October 29, 2026 and OS Inventory on October 27, 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.*