# Invoice Simple vs Window Cleaning Estimator

The clearest difference is price: Invoice Simple at Free against Window Cleaning Estimator's $7.99. Invoice Simple also leads on update cadence (every 2 weeks vs every 6 weeks) and chart position (#9 vs unranked). Window Cleaning Estimator's advantage is in-app purchases (none vs 10). On ads, device support and iOS requirement there is nothing between them.

Invoice Simple is free to download; Window Cleaning Estimator costs $7.99 up front. Invoice Simple sells 9 in-app purchases, starting at $6.99 per month. Window Cleaning Estimator asks for nothing beyond the download.

Invoice Simple ships an update every 2 weeks, Window Cleaning Estimator every 6 weeks. Both last shipped on November 4, 2026.

## The numbers

| Metric | Invoice Simple | Window Cleaning Estimator |
| --- | --- | --- |
| Price | **Free** | $7.99 |
| Rating | **[4.9 (123K ratings)](https://appshunter.io/ios/app/invoice-simple-invoice-maker/id694831622/reviews)** | — |
| Number of ratings | **123K** | — |
| Positive reviews | 63.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 6 weeks |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#9** | — |
| Size | 221 MB | 2 MB |
| Requires iOS | **16.4** | 17.3 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Zenvoice Inc.](https://appshunter.io/developer/990870994) | [Michael Haslam](https://appshunter.io/developer/1439018618) |

## What reviewers say

### Invoice Simple

[App page](https://appshunter.io/ios/app/invoice-simple-invoice-maker/id694831622)

**Currently charting:** #9 Top Grossing · Business (US App Store)

Create and send professional invoices, estimates, and receipts quickly from your mobile device. This app helps individuals and growing businesses get organized, look professional, and get paid faster by accepting online payments.

**Highlights:** Create invoices, estimates, and receipts, Accept online payments, Customize invoices with logo and details, Organize client and product information, Send via email, text, or WhatsApp, Download as PDF, Get payment and opening alerts

**Features:** iPhone Duo support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Essentials Monthly | $6.99 | per month |
| Mobile subscription | $10.99 | per month |
| Monthly Side Business | $10.99 | per month |
| Monthly Business Sub | $11.99 | per month |
| Monthly Subscription | $11.99 | per month |
| Monthly subscription | $13.49 | per month |
| Plus Monthly | $14.99 | per month |
| Monthly Standard Subscription | $17.99 | per month |
| Premium Monthly | $21.99 | per month |

**What reviewers like**

- 🚀 Easy to use
- 👍 Professional-looking invoices
- 🚀 Quick and simple
- 👍 Saves time
- 👍 Convenient mobile access

**What reviewers complain about**

- 💰 Expensive subscription
- 🐛 Glitches and bugs
- 🔀 Inconsistent features across platforms
- 🔀 Confusing navigation
- 🔀 Limited customization options

**Reported bugs**

- Invoices not sending properly
- App crashing or freezing
- Inability to recover deleted invoices
- Syncing issues between mobile and desktop

**Requested features**

- Add ability to rearrange line items
- Improve search and filtering capabilities
- Integrate with accounting software
- Add option to track expenses and profitability
- Allow multiple business profiles in one account


### Window Cleaning Estimator

[App page](https://appshunter.io/ios/app/window-cleaning-estimator/id6496853940)

**In-app purchases:** none


## Frequently asked questions

### Is Invoice Simple free?

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

### Is Window Cleaning Estimator free?

Window Cleaning Estimator costs $7.99, with no in-app purchases.

### Do Invoice Simple or Window Cleaning Estimator have ads?

Neither Invoice Simple nor Window Cleaning Estimator shows ads.

### Which is updated more often, Invoice Simple or Window Cleaning Estimator?

Invoice Simple ships an update every 2 weeks, and Window Cleaning Estimator every 6 weeks. Most recently, Invoice Simple was updated on November 4, 2026 and Window Cleaning Estimator on November 4, 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.*