Five pillars.
One complete diagnosis.
The Science of Apps method evaluates every screen, interaction and journey of an app through five behavioural pillars, in three phases over 2–4 weeks. Each finding explains what is happening, why, what impact it has and what to do next, so teams fix the psychological cause of drop-off — not just the symptom.
The five pillars
01 · User Behaviour & Decision System (Core)
Understanding the cognitive load and decision architecture that shapes user choices.
Principles evaluated: Anchoring Effect, Change Blindness, Choice Overload, Cognitive Bias, Cognitive Load, Decoy Effect, Framing Effect, Hick's Law, Hyperbolic Discounting, Loss Aversion, Mental Model, Recognition over Recall, Scarcity Effect, Selective Attention, Working Memory.
02 · Onboarding Science (First Mile)
Optimising the critical first moments to ensure immediate value perception and trust.
Principles evaluated: Commitment & Consistency, Curiosity Gap, Default Effect, Fogg Behavior Model, Goal-Gradient Effect, IKEA Effect, Paradox of the Active User, Progressive Disclosure, Reciprocity, Zeigarnik Effect.
03 · UX & Design Science (Experience)
Aligning visual hierarchy and interaction patterns with human visual processing.
Principles evaluated: Aesthetic-Usability Effect, Affordances & Signifiers, Banner Blindness, Chunking, F-Shaped Pattern, Figure-Ground, Fitts's Law, Law of Closure, Law of Common Fate, Law of Common Region, Law of Continuity, Law of Prägnanz, Law of Proximity, Law of Similarity, Law of Uniform Connectedness, Miller's Law, Serial Position Effect, Steering Law, Von Restorff Effect.
04 · Competitor Analysis (Market)
Benchmarking against industry standards through a behavioural lens.
Principles evaluated: Authority Bias, Jakob's Law, Kano Model, Occam's Razor, Pareto Principle, Social Proof.
05 · Friction & Flow Psychology (Retention)
Identifying and removing psychological barriers that lead to user drop-off.
Principles evaluated: Doherty Threshold, Endowment Effect, Flow, Gall's Law, Labor Illusion, Parkinson's Law, Peak-End Rule, Postel's Law, Tesler's Law, Variable Reward.
Three phases
- Setup & Observation. Scope definition, product familiarisation and unbiased observation of the app experience across key user journeys. No assumptions — clean eyes.Scope definitionProduct familiarisationUnbiased observation
- Detailed Evaluation. Systematic analysis across the selected pillars. Established behavioural theories are applied to identify friction points, decision gaps and behavioural patterns, backed by interviews, review mining and competitor benchmarks.Pillar analysisFriction identificationDecision gap mapping
- Synthesis & Reporting. Insights are consolidated, prioritised and turned into clear, actionable recommendations, delivered as a structured report and a live walkthrough with your team.Insight consolidationPrioritisationActionable roadmap
Every finding answers four questions
- 01What is happening?
- 02Why is it happening?
- 03What impact does it create?
- 04What should be done next?
Findings are ranked so your team knows which changes to make first.
Deliverables include a structured findings report, competitor insights, a behavioural journey analysis, prioritised recommendations, a written action roadmap and a live walkthrough session. See what each tier includes.
Behavioral UX audit vs other methods
| Behavioral UX audit | Heuristic evaluation | Usability testing | |
|---|---|---|---|
| Main question | Why do users behave this way, and what will change it? | Does the interface follow usability rules? | Where do users struggle on set tasks? |
| Evidence | Psychology principles + interviews, reviews, analytics and competitors | Expert judgement against a checklist | Observed sessions with a handful of users |
| Output | Prioritised fixes with the behavioural cause and a measure for each | List of rule violations by severity | Task success, time and observed problems |
| Covers motivation and decisions | Yes | Rarely | Partly (what, not why) |
| Typical duration | 2–4 weeks | Days to 1–2 weeks | 1–3 weeks |
The principles behind the method
Each pillar draws on the Laws of UX library: 60 psychology and behavioural-science principles, each explained with app examples, how to apply it and research sources.
Frequently asked questions
What is a behavioral UX audit?
A behavioral UX audit evaluates a digital product against established findings from psychology and behavioural economics to explain why users hesitate, drop off or churn — and which changes will help most. It goes beyond usability by explaining the human reason behind each problem.
How is a behavioral UX audit different from a heuristic evaluation?
A heuristic evaluation checks an interface against usability rules of thumb, usually by experts alone. A behavioral UX audit adds psychology (decision-making, motivation, memory, perception) and evidence from real users, and prioritises fixes by their likely impact on activation, conversion and retention.
What are the five pillars?
The five pillars are User Behaviour & Decision System, Onboarding Science, UX & Design Science, Competitor Analysis, Friction & Flow Psychology. Each pillar groups the principles we use to evaluate one part of the experience.
What does a finding look like?
Every finding answers four questions: what is happening, why it is happening, what impact it creates and what should be done next — with the principle behind it and a way to measure the fix.
How long does the process take?
The three phases take 2 to 4 weeks in total, depending on the number of journeys, platforms and user segments in scope.
Put your app through the method.
Start with one journey or the full funnel. Every engagement is fixed scope and delivered in 2–4 weeks.