# SpiritData vs Rare PDFs

The clearest difference is in-app purchases: Rare PDFs at none against SpiritData's 2. Rare PDFs also leads on ads (none vs shown) and update cadence (weekly vs every 6 weeks). SpiritData's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 18.2). On price, rating and ratings volume there is nothing between them.

Both are free to download. SpiritData sells 2 one-off in-app purchases. Rare PDFs asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for SpiritData against 5.0 for Rare PDFs. Both are backed by a comparable volume of ratings — 6 and 3 respectively.

SpiritData ships an update every 6 weeks, Rare PDFs weekly. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | SpiritData | Rare PDFs |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (6 ratings)](https://appshunter.io/ios/app/spiritdata/id6738769817/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/rare-pdfs/id6741166501/reviews) |
| Number of ratings | **6** | 3 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 128 MB | 114 MB |
| Requires iOS | **13.0** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Joseph Wozniak](https://appshunter.io/developer/1779009717) | [Isaac Kronz](https://appshunter.io/developer/1793393704) |

## What reviewers say

### SpiritData

[App page](https://appshunter.io/ios/app/spiritdata/id6738769817)

This app uses AI to detect and visualize potential paranormal activity through body and face tracking, and speech recognition. It presents raw, unfiltered interpretations from publicly accessible software libraries, aiming for unbiased entity detection and communication.

**Highlights:** Persistent SLS-like body detection, Face detection, EVP speech recognition with on-screen text, Unfiltered AI interpretation, Open-source web version available

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Promo Code Half Off | $4.99 | one-time |
| Remove Ads from SpiritData | $9.99 | one-time |


### Rare PDFs

[App page](https://appshunter.io/ios/app/rare-pdfs/id6741166501)

Explore a curated collection of unique and obscure PDFs from public domain sources, including content from notable figures and organizations. The app features a built-in reader with dark mode and a daily PDF unlock feature.

**Highlights:** Obscure PDF collection, Public domain documents, Built-in PDF reader, Dark mode support, Daily PDF unlock library

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SpiritData free?

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

### Is Rare PDFs free?

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

### Which has better reviews, SpiritData or Rare PDFs?

SpiritData and Rare PDFs are both rated 5.0 out of 5 on the App Store, from 6 and 3 ratings respectively.

### Do SpiritData or Rare PDFs have ads?

SpiritData shows ads; Rare PDFs does not.

### Which is updated more often, SpiritData or Rare PDFs?

SpiritData ships an update every 6 weeks, and Rare PDFs weekly. Most recently, SpiritData was updated on October 21, 2026 and Rare PDFs on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*