Psychology 1 vs Relationship Decoder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Psychology 1
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.
- Book summaries on psychology topics
- Temperament sorter questionnaire
- Personality profile insights
- Practical advice on decision making
- Covers psychology, sociology, and economics
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Wouldn't it be great to know more about people’s (including yourself) personalities, preferences, behaviors, motivations, and backgrounds? Personal and Interpersonal success depend greatly on understanding the self and others, and this application is a useful tool in that challenge. Popular psychology has taken great steps recently, and there is an increasing amount of books that cover its entertaining and informing topics. Psychology-I is a great entry point to the great world of psychology, personalities, and behaviors. It combines interest with practical benefit to produce a highly useful and informing set of ideas. Psychology-I contains well written, concise, and rich-enough summaries of highly important and influential books that cover personalities, judgment, behavior, habits, intelligence, memory, irrationality, motivation, and more… Start with taking the temperament sorter questionnaire, learn more about your personality profile (and those of others), and then go on to read about making better decisions, understanding behavior, the different intelligences, motivation, and irrationality. The aim has been to make the summaries as informing as possible, while avoiding excess technical description, and including as many examples and case studies as possible. Psychology-I presents an arsenal of ideas that spans psychology, sociology, behavioral economics, brain science and neurology, and strategy and decision making. Note: Please note that the book summaries in this app are offered as an in-app purchase and are NOT for free. This app doesn't bombard you with unwanted advertising, so please accept our model of revenue since creating maintaining this content takes a lot of time and effort.
Relationship Decoder
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Understand Your Relationships Through Ancient Wisdom Discover why you connect — or clash — with partners, family, and colleagues. Have you ever asked yourself... • Will my relationship last? • Why do I struggle to understand my children? • Why can't I commit? • What changes can I — or we — make to finally make things work? • Is this the right business partner for me? (Before problems arise.) These questions reveal relationship difficulties — but surprisingly, they can be explained by traditional Chinese knowledge of the five elements and their interactions. How it works With just the birth dates of the people involved, the app instantly shows you whether your connection is Restraining or Supporting — two fundamental dynamics that shape every relationship. For each of the 4 key life areas, you'll receive a detailed picture of your energies and how they interact when you're together. The 4 life areas covered by the app: • Future & Projects – Your ability to share common goals and build a future together. • Affective Values – The way you love, and how you need to feel loved in return. • Daily Life – How you fit together day to day, express yourselves spontaneously, and navigate career and routine. • Foundations – Your core worldview, origins, and deepest qualities. Download for free and start understanding your relationships on a deeper level. Auto-Renewable Subscription Terms If you choose to purchase a subscription, the following terms apply: • Payment will be charged to your Apple ID account at confirmation of purchase. • The subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. • Your account will be charged for renewal within 24 hours prior to the end of the current period, and the cost of renewal will be identified. • You can manage your subscription and turn off auto-renewal by going to your Account Settings on the App Store after purchase. • Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription. Privacy Policy: https://i-arun-softwares.com/PrivacyPolicy.html Terms of Use: https://i-arun-softwares.com/TermsOfService.html
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Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Psychology 1 | Relationship Decoder |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (5 ratings) — better | — |
| Positive reviews | 20.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 6 months — better | Every 7 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 36 MB | 38 MB |
| Age rating | 4+ | 12+ |
| Developer | 111 (LLC) | Laurent Bottigliengo |
In-app purchases
Psychology 1
- summary of The Psychology of Judgment and Decision Making$0.99
- summary of Made to Stick$0.99
- summary of Please Understand Me II$1.99
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- summary of Frames of Mind$1.99
- summary of A Whole New Mind$1.99
- summary of Predictably Irrational$1.99
- summary of On Being Certain$1.99
- summary of The Power of Habit$1.99
- summary of Drive$1.99
- All Psychology Book Summaries at a discounted price (save 40%)$9.99
Relationship Decoder
- Monthly Subscription$11.991 Month
- Perform 1 relationship Study$5.99
- Unlimited Access$299.99
Questions
Is Psychology 1 free?
Is Relationship Decoder free?
Do Psychology 1 or Relationship Decoder have ads?
Which is updated more often, Psychology 1 or Relationship Decoder?
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