# Psychology 1 vs Relationship Decoder

The clearest difference is iOS requirement: Psychology 1 at 9.0 against Relationship Decoder's 16.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Psychology 1 sells 10 one-off in-app purchases and Relationship Decoder sells 3 in-app purchases, starting at $11.99 per month. Whichever you choose, the download price is not the number that matters.

Psychology 1 ships an update every 6 months, Relationship Decoder every 7 months. The most recent releases landed on September 25, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Psychology 1 | Relationship Decoder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (5 ratings)](https://appshunter.io/ios/app/psychology-1/id647792556/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 7 months |
| Monetization | Free with in-app purchases | — |
| Size | 36 MB | 38 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [111   (LLC)](https://appshunter.io/developer/507380930) | [Laurent Bottigliengo](https://appshunter.io/developer/1233984041) |

## What reviewers say

### Psychology 1

[App page](https://appshunter.io/ios/app/psychology-1/id647792556)

Explore human personalities, behaviors, and motivations through concise summaries of influential psychology books. Discover your own personality profile and learn practical insights for personal and interpersonal success.

**Highlights:** Book summaries on psychology topics, Temperament sorter questionnaire, Personality profile insights, Practical advice on decision making, Covers psychology, sociology, and economics

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| summary of The Psychology of Judgment and Decision Making | $0.99 | one-time |
| summary of Made to Stick | $0.99 | one-time |
| summary of Please Understand Me II | $1.99 | one-time |
| summary of Frames of Mind | $1.99 | one-time |
| summary of A Whole New Mind | $1.99 | one-time |
| summary of Predictably Irrational | $1.99 | one-time |
| summary of On Being Certain | $1.99 | one-time |
| summary of The Power of Habit | $1.99 | one-time |
| summary of Drive | $1.99 | one-time |
| All Psychology Book Summaries at a discounted price (save 40%) | $9.99 | one-time |


### Relationship Decoder

[App page](https://appshunter.io/ios/app/relationship-decoder/id1444353072)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $11.99 | per month |
| Perform 1 relationship Study | $5.99 | one-time |
| Unlimited Access | $299.99 | one-time |


## Frequently asked questions

### Is Psychology 1 free?

Psychology 1 is free to download, with in-app purchases available.

### Is Relationship Decoder free?

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

### Do Psychology 1 or Relationship Decoder have ads?

Neither Psychology 1 nor Relationship Decoder shows ads.

### Which is updated more often, Psychology 1 or Relationship Decoder?

Psychology 1 ships an update every 6 months, and Relationship Decoder every 7 months. Most recently, Psychology 1 was updated on September 25, 2026 and Relationship Decoder on October 3, 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.*