Linus Tester vs outSMARTPD
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Linus Tester
This platform collects extensive digital measurements related to brain health, including voice, speech, gait, cognition, and eye movement. It uses machine learning to analyze this data alongside electronic health records, creating precise metrics for evaluating interventions and personalizing brain health recommendations.
- Digital measurement collection
- Voice and speech analysis
- Gait and cognition tracking
- Eye movement monitoring
- Machine learning data analysis
- Electronic health record integration
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The Linus platform allows the coordinated collection of large amounts of information about digital measurements—such as voice, speech, gait, cognition and eye movement—that may have a bearing on brain health and lead to the identification of digital biomarkers. Applying machine learning methods of data analysis to this rich set of measurements, together with information drawn from electronic health records, provides a composite picture with more precise metrics for evaluating the impact of potential interventions and lifestyle changes, and for offering personalized prescriptions to promote brain health.
outSMARTPD
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outSMARTPD is an app built to assess your symptoms and determine if they are Parkinsonian. To use the app, follow the instructions to complete the non-motor surveys and then take a few quick motor tests. Immediately, the app will return your percent likelihood of having Parkinson's Disease. NOTE: This app does not diagnose Parkinson's Disease. This app does not give out medical information or recommendations. Please consult a doctor for any and all abnormal symptoms. This app is simply a tool to help users understand their symptoms from the comfort of their own home; please visit a doctor for any medical guidance.
Screenshots
Verdict
The clearest difference is update cadence: outSMARTPD at every 2 weeks against Linus Tester's every 2 months. On price, ads, in-app purchases and device support 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. Neither carries in-app purchases, so what you see is what you pay.
Linus Tester ships an update every 2 months, outSMARTPD every 2 weeks. The most recent releases landed on June 7, 2026 and September 18, 2026 respectively.
| Parameter | Linus Tester | outSMARTPD |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (4 ratings) — better | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 202 MB | 32 MB |
| Age rating | 4+ | 12+ |
| Developer | Linus Health, Inc. | outSMARTPD LLC |
In-app purchases
Linus Tester
No in-app purchases
outSMARTPD
No in-app purchases




