# FS SAT vs Invoice Maker・Billing App

The clearest difference is update cadence: Invoice Maker・Billing App at every 2 weeks against FS SAT's every 2 months. Invoice Maker・Billing App also leads on chart position (#100 vs unranked). FS SAT's advantage is iOS requirement (11.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. FS SAT sells 1 one-off in-app purchase and Invoice Maker・Billing App sells 12 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

FS SAT ships an update every 2 months, Invoice Maker・Billing App every 2 weeks. The most recent releases landed on September 29, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | FS SAT | Invoice Maker・Billing App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (7.3K ratings)](https://appshunter.io/ios/app/invoice-makerbilling-app/id1447239633/reviews)** |
| Number of ratings | — | **7.3K** |
| Positive reviews | — | 56.1% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Best chart rank | — | **#100** |
| Size | 24 MB | 322 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [FARANDSOFT](https://appshunter.io/developer/450465994) | [Saldo Apps Inc.](https://appshunter.io/developer/1277532073) |

## What reviewers say

### FS SAT

[App page](https://appshunter.io/ios/app/fs-sat/id492216788)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Module expenses | $59.99 | one-time |


### Invoice Maker・Billing App

[App page](https://appshunter.io/ios/app/invoice-makerbilling-app/id1447239633)

**Currently charting:** #100 Top Grossing · Business (US App Store)

Create and share professional invoices and estimates quickly from any device. Save time on paperwork, stay organized, and get paid faster with customizable branding and payment options. Focus on your business while this app handles your billing.

**Highlights:** Create invoices and estimates quickly, Convert estimates to invoices, Save product/service details, Calculate taxes and discounts, Add payment methods, Customizable branding, Add signatures and photos

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium Subscription | $7.99 | per month |
| Weekly Premium Subscription | $7.99 | per 7 days |
| Weekly Premium Subscription | $7.99 | per 7 days |
| Saldo Apps Premium | $9.99 | per 7 days |
| Saldo Apps Premium | $11.99 | per 7 days |
| Saldo Apps Premium | $14.99 | per month |
| Invoice Maker PRO Monthly | $14.99 | per month |
| Invoice Maker PRO Monthly | $14.99 | per month |
| Monthly subscription | $14.99 | per month |
| Monthly Premium Subscription | $15.99 | per month |
| Annual Premium Subscription | $49.99 | per year |
| Saldo Apps Premium Yearly | $99.99 | per year |

**What reviewers like**

- 👍 User-friendly layout
- 🚀 Fast and efficient
- 📝 Professional-looking invoices
- 💰 Convenient payment options
- 📊 Helpful reporting and tracking features

**What reviewers complain about**

- 🐛 Occasional crashes and glitches
- 🔄 Issues with syncing and data loss
- 💰 Subscription model concerns
- 🕰️ Slow response times
- 🔒 Security and login problems

**Reported bugs**

- Invoices not sending properly
- Subscription issues and unexpected charges
- Data loss after app updates or device changes
- Compatibility problems with newer iOS versions
- Invoices showing as drafts unexpectedly

**Requested features**

- Add late fee feature
- Improve invoice customization options
- Integrate with inventory management systems
- Provide better customer support channels
- Offer a one-time purchase option


## Frequently asked questions

### Is FS SAT free?

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

### Is Invoice Maker・Billing App free?

Invoice Maker・Billing App is free to download, with in-app purchases available.

### Do FS SAT or Invoice Maker・Billing App have ads?

Neither FS SAT nor Invoice Maker・Billing App shows ads.

### Which is updated more often, FS SAT or Invoice Maker・Billing App?

FS SAT ships an update every 2 months, and Invoice Maker・Billing App every 2 weeks. Most recently, FS SAT was updated on September 29, 2026 and Invoice Maker・Billing App on October 16, 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.*