# Bknil SEO vs InvoiceFlow

The clearest difference is in-app purchases: InvoiceFlow at none against Bknil SEO's 4. InvoiceFlow also leads on update cadence (every 6 days vs monthly) and iOS requirement (13.0 vs 15.0). Bknil SEO's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Bknil SEO sells 4 one-off in-app purchases. InvoiceFlow asks for nothing beyond the download.

Bknil SEO ships an update monthly, InvoiceFlow every 6 days. The most recent releases landed on August 7, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Bknil SEO | InvoiceFlow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 6 days** |
| Size | 27 MB | 8 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SANGWOO NOH](https://appshunter.io/developer/1771933747) | [Ryoma Uchida](https://appshunter.io/developer/1881607222) |

## What reviewers say

### Bknil SEO

[App page](https://appshunter.io/ios/app/bknil-seo-backlink-builder/id6751446596)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Starter | $5.99 | one-time |
| Basic | $11.99 | one-time |
| Pro | $24.99 | one-time |
| Enterprise | $49.99 | one-time |


### InvoiceFlow

[App page](https://appshunter.io/ios/app/invoiceflow-invoice-maker/id6762558785)

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

**In-app purchases:** none


## Frequently asked questions

### Is Bknil SEO free?

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

### Is InvoiceFlow free?

InvoiceFlow is free to download, with no in-app purchases.

### Do Bknil SEO or InvoiceFlow have ads?

InvoiceFlow shows ads; Bknil SEO does not.

### Which is updated more often, Bknil SEO or InvoiceFlow?

Bknil SEO ships an update monthly, and InvoiceFlow every 6 days. Most recently, Bknil SEO was updated on August 7, 2026 and InvoiceFlow on September 14, 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.*