# Pillowbook vs Sidera

The clearest difference is in-app purchases: Pillowbook at none against Sidera's 3. Pillowbook also leads on ads (none vs shown). Sidera's advantage is update cadence (every 2 days vs every 2 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Sidera sells 3 one-off in-app purchases. Pillowbook asks for nothing beyond the download.

Pillowbook ships an update every 2 months, Sidera every 2 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Pillowbook | Sidera |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pillowbook-dream-decoder/id6775021552/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 36 MB | 36 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AndyTech, Inc](https://appshunter.io/developer/1679172216) | [Su Jin Yang](https://appshunter.io/developer/6806914046) |

## What reviewers say

### Pillowbook

[App page](https://appshunter.io/ios/app/pillowbook-dream-decoder/id6775021552)

Record your dreams and receive personalized interpretations based on a vast library of symbols and your unique personal history. This app builds a knowledge graph of your dream elements to reveal recurring themes and connections.

**Highlights:** Dream journaling, Personalized dream interpretation, Symbol library, Knowledge graph of dream elements, Theme and connection analysis

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

**In-app purchases:** none


### Sidera

[App page](https://appshunter.io/ios/app/sidera-korean-astrology/id6806914044)

This app analyzes your birth moment using both Korean Saju and Western astrology, offering detailed interpretations and comparisons. It allows you to explore raw chart data, compare astrological readings with MBTI types, and assess compatibility with others.

**Highlights:** Dual Saju and Western birth chart analysis, AI-driven interpretation of astrological data, Detailed raw chart exploration, MBTI type comparison, Relationship compatibility readings, Multiple house division methods

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Light — 20 questions | $2.99 | one-time |
| Standard — 60 questions | $6.99 | one-time |
| Ultra — 150 questions | $14.99 | one-time |


## Frequently asked questions

### Is Pillowbook free?

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

### Is Sidera free?

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

### Do Pillowbook or Sidera have ads?

Sidera shows ads; Pillowbook does not.

### Which is updated more often, Pillowbook or Sidera?

Pillowbook ships an update every 2 months, and Sidera every 2 days. Most recently, Pillowbook was updated on November 5, 2026 and Sidera on October 31, 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.*