# Sigmax vs Invoice Docs Maker

The clearest difference is update cadence: Invoice Docs Maker at every 4 days against Sigmax's every 4 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Sigmax sells 4 in-app purchases, starting at $9.99 per 7 days and Invoice Docs Maker sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Sigmax ships an update every 4 weeks, Invoice Docs Maker every 4 days. Both last shipped on November 5, 2026.

## The numbers

| Metric | Sigmax | Invoice Docs Maker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (4 ratings)](https://appshunter.io/ios/app/invoice-docs-maker/id6762945383/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 27 MB | 11 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [雅菲 高](https://appshunter.io/developer/1835311713) | [Pro Plays](https://appshunter.io/developer/1896327336) |

## What reviewers say

### Sigmax

[App page](https://appshunter.io/ios/app/sigmax-fill-and-sign-documents/id6753884376)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sigmax Pro Week1 | $9.99 | per 7 days |
| Sigmax Pro Week2 | $9.99 | per 7 days |
| Sigmax Pro Year1 | $19.99 | per year |
| Sigmax Pro Year2 | $34.99 | per year |


### Invoice Docs Maker

[App page](https://appshunter.io/ios/app/invoice-docs-maker/id6762945383)

Create professional invoices and PDF bills quickly and easily without sign-up or cloud storage. Manage clients, add line items, discounts, taxes, and signatures. Everything is stored locally on your device for maximum privacy.

**Highlights:** Create invoices with line items, discounts, and taxes, Auto-numbering for invoices, Add digital signatures, Manage client list, 150+ currencies supported, Export and share as PDF, Revenue reports

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Weekly | $2.99 | per 7 days |
| PRO Monthly | $9.99 | per month |
| PRO Annual | $59.99 | per year |


## Frequently asked questions

### Is Sigmax free?

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

### Is Invoice Docs Maker free?

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

### Do Sigmax or Invoice Docs Maker have ads?

Neither Sigmax nor Invoice Docs Maker shows ads.

### Which is updated more often, Sigmax or Invoice Docs Maker?

Sigmax ships an update every 4 weeks, and Invoice Docs Maker every 4 days. Most recently, Sigmax was updated on November 5, 2026 and Invoice Docs Maker on November 5, 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.*