# Builder Lynx Mobile Tools vs Invoice Maker by SPK

The clearest difference is in-app purchases: Builder Lynx Mobile Tools at none against Invoice Maker by SPK's 9. Invoice Maker by SPK's advantage is update cadence (weekly vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Invoice Maker by SPK sells 9 in-app purchases, starting at $4.99 per month. Builder Lynx Mobile Tools asks for nothing beyond the download.

Builder Lynx Mobile Tools ships an update every 3 weeks, Invoice Maker by SPK weekly. The most recent releases landed on October 24, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Builder Lynx Mobile Tools | Invoice Maker by SPK |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (912 ratings)](https://appshunter.io/ios/app/invoice-maker-by-spk/id1575877820/reviews)** |
| Number of ratings | — | **912** |
| Positive reviews | — | 73.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 15 MB | 30 MB |
| Requires iOS | **12.1** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Builder Lynx](https://appshunter.io/developer/1232399321) | [SPK Studios LLC](https://appshunter.io/developer/1575877822) |

## What reviewers say

### Builder Lynx Mobile Tools

[App page](https://appshunter.io/ios/app/builder-lynx-mobile-tools/id1232399323)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Builder Lynx Mobile Tools free?

Builder Lynx Mobile Tools is free to download, with no in-app purchases.

### Is Invoice Maker by SPK free?

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

### Do Builder Lynx Mobile Tools or Invoice Maker by SPK have ads?

Neither Builder Lynx Mobile Tools nor Invoice Maker by SPK shows ads.

### Which is updated more often, Builder Lynx Mobile Tools or Invoice Maker by SPK?

Builder Lynx Mobile Tools ships an update every 3 weeks, and Invoice Maker by SPK weekly. Most recently, Builder Lynx Mobile Tools was updated on October 24, 2026 and Invoice Maker by SPK on November 3, 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.*