# PDFnano vs ObsiKO

The clearest difference is in-app purchases: ObsiKO at none against PDFnano's 1. ObsiKO also leads on device support (4 vs 2) and iOS requirement (15.1 vs 18.6). PDFnano's advantage is update cadence (every 2 days vs every 6 days). On price and ads there is nothing between them.

Both are free to download. PDFnano sells 1 one-off in-app purchase. ObsiKO asks for nothing beyond the download.

PDFnano ships an update every 2 days, ObsiKO every 6 days. The most recent releases landed on September 25, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | PDFnano | ObsiKO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pdfnano-pdf-editor-and-reader/id6783288588/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 6 days |
| Monetization | Free with in-app purchases | — |
| Size | 20 MB | 75 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Thamer Mohammed](https://appshunter.io/developer/1869675424) | [Hyojin Kim](https://appshunter.io/developer/6783405453) |

## What reviewers say

### PDFnano

[App page](https://appshunter.io/ios/app/pdfnano-pdf-editor-and-reader/id6783288588)

Edit, translate, and manage PDF documents with a focus on on-device privacy. This app offers tools for scanning, converting, annotating, and organizing your files locally.

**Highlights:** Read, organize, and manage PDFs, Offline PDF translation with layout preservation, Scan documents and create PDFs, Convert PDFs to Word, Excel, or images, OCR for Arabic and English text, Add signatures and annotations, Remove hidden metadata for privacy

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDFnano Pro Lifetime | $1.99 | one-time |


### ObsiKO

[App page](https://appshunter.io/ios/app/obsiko-ai-note-plus-mindmap/id6783405451)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PDFnano free?

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

### Is ObsiKO free?

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

### Do PDFnano or ObsiKO have ads?

Neither PDFnano nor ObsiKO shows ads.

### Which is updated more often, PDFnano or ObsiKO?

PDFnano ships an update every 2 days, and ObsiKO every 6 days. Most recently, PDFnano was updated on September 25, 2026 and ObsiKO on October 10, 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.*