DDx vs RCADS Test
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DDx
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DDx is a fast, offline differential diagnosis lookup tool — like a textbook in your pocket. Open any symptom and see a ranked list of diagnoses, with don't-miss conditions surfaced first. Built for medical students, residents, and clinicians who want a no-frills educational reference at the bedside. In the same category as Diagnosaurus. WHAT'S INSIDE • 375 symptoms across 17 body systems • 6,148 differentials, ranked by probability and urgency • Don't-miss diagnoses highlighted in red • ICD-10 codes for the most common conditions • Search by symptom name, synonym, ICD-10, or diagnosis • Generated PubMed search references on every diagnosis • Bookmark symptoms for quick recall Unlock the workflow tools that keep you moving fast: • Five clinical scoring calculators — HEART (chest pain risk), Wells (DVT pre-test probability), PERC (PE rule-out), CURB-65 (pneumonia severity), Modified Centor (strep pharyngitis) • Reverse condition lookup — find every symptom a diagnosis can present with • Patient-context filters — age and sex chips on every symptom • All future content and feature updates included The core differential diagnosis lookup stays free, forever. DESIGNED FOR THE BEDSIDE • Built for iPhone and iPad with full Dark Mode — true near-black for dim wards • Triage-board layout: hairline rules, ranked numerals, urgency-only color • 100% offline after install — no account, no sign-up, no tracking, no ads • Universal app: one purchase covers iPhone, iPad, and Apple Vision Pro EDUCATIONAL REFERENCE — IMPORTANT DDx is an educational reference. It is NOT a medical device, does NOT provide individualized medical advice, and is NOT a clinical decision support system. The content is generated from medical literature and may contain inaccuracies. Always verify against primary sources. Any clinical action remains the sole responsibility of the qualified clinician caring for the patient. PRIVACY DDx never collects, transmits, or stores personal data. No account. No analytics. No tracking. Bookmarks live on your device only. LICENSE Use of DDx is governed by Apple's Licensed Application End User License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
RCADS Test
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Score the RCADS in minutes — designed for clinicians. RCADS Test administers and scores the Revised Children's Anxiety and Depression Scale on iPhone and iPad. Get age- and gender-normed T-scores, six clinical subscales, and a clear chart against the T=65 threshold — without leaving the consult room. WHY RCADS TEST • Built for clinical psychologists, child and adolescent psychiatrists, school counselors and therapists. • Validated scoring against published norms — not a re-skinned consumer self-test. • Works fully offline. Nothing leaves the device. No signup, no account. WHAT'S INSIDE • Both the Child Self-Report and Parent-Report forms (47 items each, ~a few minutes). • Automatic T-score conversion using age- and gender-based norms. • Six subscales: Separation Anxiety, Generalised Anxiety, Panic Disorder, Social Phobia, Obsessive-Compulsive, Major Depression. • Composite scores: Total Anxiety and Total Internalizing. • Clinical chart with the T=65 cut-off line for fast visual interpretation. • 85 languages, including English, Turkish, Spanish, French, German, Arabic, Mandarin and many more. • Hand the device to a child or parent for self-completion, or read items aloud. • Clean, calm, professional interface designed for the consult room. WHO IT'S FOR RCADS Test is for licensed mental health professionals — clinical psychologists, child and adolescent psychiatrists, school psychologists, school counselors, therapists, and supervisors training the next generation of clinicians. Parents and older adolescents may also use it, but the language and workflow are clinician-first. HOW IT WORKS 1. Pick the form (Child or Parent) and enter the child's age and gender. 2. Complete the 47 items — on your own device, or hand it to the respondent. 3. Tap Score. T-scores appear instantly with a clinical chart. 4. Save, export or discuss the result with the family. IMPORTANT RCADS Test is a screening and scoring aid. It is not a diagnostic instrument. Results must be interpreted by a qualified clinician within the context of a full assessment, clinical interview, and other corroborating information. This app is not a substitute for professional judgement or treatment. The RCADS instrument is freely available for non-commercial clinical and research use. RCADS Test provides scoring, normed T-score conversion, charting, multilingual administration, and clinical workflow on top of the published instrument. Apple Terms of Use apply: https://www.apple.com/legal/internet-services/itunes/dev/stdeula http://mosoajans.com/terms-of-use.html http://mosoajans.com/privacy-policy.html
Screenshots
Verdict
The clearest difference is in-app purchases: RCADS Test at none against DDx's 1. On price, ads, device support and iOS requirement 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. DDx sells 1 one-off in-app purchase. RCADS Test asks for nothing beyond the download.
| Parameter | DDx | RCADS Test |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Every 2 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 12 MB | 13 MB |
| Age rating | 17+ | 12+ |
| Developer | Medicon Apps | Unipeersity Inc. |
In-app purchases
DDx
- DDx Pro$9.99
RCADS Test
No in-app purchases







