# ProBooks vs Invoice Maker by SPK

ProBooks and Invoice Maker by SPK both sit at 4.8 stars, but that hides the real split: 88% of ProBooks's written reviews are positive against 73% of Invoice Maker by SPK's. Invoice Maker by SPK's advantage is iOS requirement (13.0 vs 15.1). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. ProBooks sells 3 in-app purchases, starting at $4.99 per month and Invoice Maker by SPK sells 9 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for ProBooks against 4.8 for Invoice Maker by SPK. Both are backed by a comparable volume of ratings — 442 and 911 respectively. Written reviews are what separate them: 88% of ProBooks's written reviews are positive against 73% of Invoice Maker by SPK's.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ProBooks | Invoice Maker by SPK |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (442 ratings)](https://appshunter.io/ios/app/probooks-invoice-maker/id836090315/reviews)** | [4.8 (911 ratings)](https://appshunter.io/ios/app/invoice-maker-by-spk/id1575877820/reviews) |
| Number of ratings | 442 | **911** |
| Positive reviews | **87.9% of reviews** | 73.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 61 MB | 30 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ProBooks](https://appshunter.io/developer/1760398888) | [SPK Studios LLC](https://appshunter.io/developer/1575877822) |

## What reviewers say

### ProBooks

[App page](https://appshunter.io/ios/app/probooks-invoice-maker/id836090315)

Create professional invoices and estimates in seconds with this app. It helps manage expenses, track payments, and send bills efficiently. Customize templates and accept various payment methods to streamline your business finances.

**Highlights:** Create invoices and estimates, Expense tracking and management, Customizable invoice templates, Recurring invoice setup, Payment processing, Receipt generation, Client signature capture

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Everything | $4.99 | per month |
| Unlock Everything | $49.99 | per year |
| AI Logo Pack | $4.99 | one-time |

**What reviewers like**

- 👍 User-friendly and intuitive interface
- 📱 Seamless cross-device syncing (iPhone, iPad, MacBook)
- 🎨 Professional and customizable invoice templates
- 💰 Affordable pricing with flexible subscription options
- ⚡ Quick and easy invoice creation process

**What reviewers complain about**

- 🐛 Data loss during app updates (critical issue)
- 📱 Mobile app has significant glitches and bugs
- 🔍 Search functionality doesn't find customers reliably
- ❌ Missing customer names in estimates tab
- 😞 Inconsistent customer service response times

**Reported bugs**

- Customer database deletion after forced updates
- All invoices and profile data disappearing
- Mobile app query doesn't find customers
- Estimates tab missing customer names
- App force logs out after leaving

**Requested features**

- Dark mode option
- Payment method quick options (Zelle, Venmo, Cash App)
- Horizontal/landscape mode support
- Automotive shop customization (make, model, year, VIN, license plate)
- Dashboard restoration or improvement


### Invoice Maker by SPK

[App page](https://appshunter.io/ios/app/invoice-maker-by-spk/id1575877820)

Create and send professional PDF invoices and estimates quickly and easily. This ad-free, watermark-free app is ideal for small business owners, consultants, and freelancers on the go. Customize templates, track clients, and manage your billing efficiently.

**Highlights:** Create unlimited invoices and estimates, No ads or watermarks, Customizable invoice fields, Client list management, Multiple sharing options (email, WhatsApp, text), Convert estimates to invoices, Company logo and signature upload

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| My Invoice Generator | $4.99 | per month |
| The Invoice Maker | $7.99 | per month |
| Invoice Maker App | $9.99 | per month |
| Invoice Maker Pro | $9.99 | per month |
| Smart Invoice Maker | $39.99 | per year |
| Quick Invoice Maker | $59.99 | per year |
| Invoice Maker Professional | $69.99 | per year |
| App Invoice Maker | $89.99 | per year |
| Invoice Maker Plus | $89.99 | per year |

**What reviewers like**

- 👍 Easy to use
- 🚀 Quick and efficient
- 💡 Helpful features
- ⭐ Great app overall

**What reviewers complain about**

- 🐛 Data loss issues
- 🔒 Lack of device sync
- 📝 Limited item descriptions
- 🔧 Unreliable functionality

**Reported bugs**

- Invoices not updating correctly
- Inability to unsubscribe from paid features

**Requested features**

- Ability to sync data across devices
- Increased character limit for item descriptions
- Improved customer support


## Frequently asked questions

### Is ProBooks free?

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

### Is Invoice Maker by SPK free?

Invoice Maker by SPK is free to download, with in-app purchases available.

### Which has better reviews, ProBooks or Invoice Maker by SPK?

ProBooks is rated higher. ProBooks averages 4.8 out of 5 from 442 ratings, while Invoice Maker by SPK averages 4.8 from 911 ratings.

### Do ProBooks or Invoice Maker by SPK have ads?

Neither ProBooks nor Invoice Maker by SPK shows ads.

### Which is updated more often, ProBooks or Invoice Maker by SPK?

ProBooks ships an update weekly, and Invoice Maker by SPK weekly. Most recently, ProBooks was updated on October 26, 2026 and Invoice Maker by SPK on October 24, 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.*