CNS trials are won and lost on rating-scale quality, blinding and participant-reported outcomes. Here is how to choose an EDC for them, a category-level comparison of the usual options, and where Capture does not fit.
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| Assessment | Screen | Baseline | Wk 4 | Wk 8 | Wk 12 | Follow-up |
|---|---|---|---|---|---|---|
| Clinician-rated scale | ||||||
| Cognitive assessment | ||||||
| Participant diary (phone) | D | D | D | D | ||
| Adverse events |
x = visit form, D = diary period
The short answer
The buying problem
In many therapeutic areas the primary endpoint is a lab value or an event. In central nervous system trials it is often a score: a clinician-rated scale in depression, schizophrenia, Parkinson's or multiple sclerosis, a cognitive battery in dementia, or a seizure or headache diary kept by the participant. These measurements are subjective, vary between raters and are sensitive to timing, so the quality of the data depends on process as much as on software. An EDC that treats a scale as a form with a few fields misses what matters: who scored it, when, under what recall window and whether a blinded rater ever saw something they should not.
That is why selection criteria for CNS differ from a general EDC buying checklist. You are looking for forms that can hold an instrument item by item, an audit trail that attributes every entry to a person, role design that supports blinded and unblinded staff in the same study, participant questionnaires on a phone that land in the same record as site data, and visit windows that make out-of-window assessments visible early. The therapeutic-area depth is covered on our pages for EDC for CNS and neurology trials, EDC for psychiatry trials, Alzheimer's and dementia and Parkinson's disease.
CNS programs also tend to be run by lean biotechs, with a small clinical operations team and a CRO for sites. A system that the sponsor team can build, test and change without a vendor project suits that structure, and a system that locks the sponsor out of its own build does not. Ask who changes forms mid-study and how long a change takes; see protocol amendments without change orders.
Selection criteria
Score each option on the same sheet and run the same test scale through each.
Build a real scale item by item and time it. Note who had to help.
Change a value and find the audit trail entry with user, old value, new value and reason.
Ask whether blinded roles are blocked at the database level or only hidden in the interface.
Check whether ePRO is built in or integrated, and whether it shares the audit trail.
Look at how out-of-window assessments are flagged.
Ask what the vendor does and does not do; licences normally stay with the sponsor.
Ask when charges start and what a pilot costs before go-live.
Ask about rater training, central rating, imaging and a safety database.
Comparison
Neutral, category-level descriptions, not feature or pricing claims. Details change, so confirm everything with each vendor and in a hands-on trial.
| Option | Category | Often evaluated for | Verify in your evaluation |
|---|---|---|---|
| Capture | Self-serve, all-in-one clinical trial platform | Scales, diaries, eConsent and randomization in one audit trail; free to build and pay when live | Fit for your scales and blinding plan; licences and rater training handled outside the platform |
| Castor | Commercial EDC and decentralised platform | Mid-market sponsors and CROs | Scale build effort, blinding set-up and commercial terms. See Capture vs Castor |
| REDCap | Institution-hosted research data capture | Academic studies with institutional support | Blinding, signatures and who owns validation. See Capture vs REDCap |
| Medrio | Commercial EDC for sponsors and CROs | Early-phase and small-to-mid-size trials | Build time and included modules. See Capture vs Medrio |
| Viedoc | Commercial clinical trial platform | Studies running across many countries | Commercial model and module scope. See Capture vs Viedoc |
| OpenClinica | EDC with an open-source heritage | Teams wanting configurability and hosting choice | Hosting model, support level and validation ownership. See Capture vs OpenClinica |
| Specialist rating and eCOA services | Rater training, central rating and licensed instrument delivery | Programs where scale quality is the main risk | How their data reach the EDC and who owns the instrument licences |
No pricing or feature claims are made about any vendor other than Capture. Verify with each vendor.
Create a rating-scale form and a phone diary in the free sandbox and test the audit trail. No credit card, nothing to pay until you go live.
Where Capture fits
Capture is a self-serve platform combining EDC, an eCRF builder, ePRO, eConsent, randomization and safety reporting with one audit trail. A clinician-rated scale is built as a site form with one typed field per item, scheduled across the visit plan, with edit checks and visit windows. The AI study builder can draft visits and forms from a protocol, and nothing is saved without human review. Starting points include the PHQ-9, C-SSRS, MoCA, MMSE, ADAS-Cog and UPDRS template pages, which show the structure of each form.
On licences, be exact. Capture does not supply licensed instruments or their wording and does not verify licences. Licence tracking controls exist on participant questionnaires only; for clinician-rated and site-completed scales the licence stays with your study documents. Nothing is blocked while licence details are missing from a questionnaire, and after a recorded expiry date no new tasks are generated. Plan with your legal and clinical teams who obtains permission for each instrument.
Participants answer diaries on their phone by secure link, with reminders, quiet hours and completion windows, and entries land in the same record as site data; see ePRO software for clinical trials. Blinded roles never receive treatment-arm values, enforced by masked database views, and randomization sits in the same system; see clinical trial platform with randomization. Each audit entry records user, old value, new value and reason for change, which is how you show attribution of a score. The controls are 21 CFR Part 11-aligned, with compliance shared with the sponsor's own validated use. Capture is used for Phase 1, 2 and 3 studies, so a pivotal CNS program is a normal use case.
Honest limits
Capture does not train or certify raters, run central rating or provide licensed scales. If your program depends on independent central review of recorded interviews, or on a vendor that delivers licensed instruments in a controlled way, that sits alongside the EDC, not inside it. It is also not an imaging core lab: if MRI or PET reads are a main data flow with central reading and adjudication, you will need a dedicated imaging system. Likewise a dedicated pharmacovigilance safety database remains a separate category, though adverse events are captured on the eCRF with an SAE workflow.
Finally, if your sponsor or CRO mandates its own EDC, you will use theirs, and if you need a validated CDISC SDTM export from the system itself, check current documentation, because Capture labels templates with SDTM domains rather than claiming a validated transformation. None of these limits is about trial size or phase.
How to run the evaluation
Use the same scale and protocol with each vendor.
Take one clinician-rated scale, one cognitive form and one participant diary from your protocol.
Record how long it takes to go from blank to approved forms, and what needed vendor help.
Change a score and find the audit entry, then log in as a blinded role and check what is visible.
Enrol yourself, receive the reminders and see how the entry lands in the study record.
Ask for the commercial model in writing, including what happens before go-live and after database lock.
Related reading
For the general market, see best EDC software in 2026. If your CNS program is run by a small CRO, best EDC for small CROs covers that angle, and teams moving from academic tooling can read how to migrate from REDCap.
It depends on your scales, blinding plan and team. Look for item-level scale forms, attribution of every score, database-level blinding, built-in ePRO and a build your own team can change. Test your own scale in each vendor's trial.
Yes. Scales are built as site eCRF forms with one typed field per item, scheduled across visits, with edit checks and visit windows. Licences for those scales stay with your study documents.
Licence tracking exists only on participant questionnaires, and it records what the study team enters. Capture does not supply or verify licences, and does not supply licensed wording.
Blinded roles never receive treatment-arm values; masked database views enforce it, not only the interface.
Yes. Capture is suitable for Phase 1, 2 and 3 studies, including multi-site pivotal programs.
No. Rater training and central rating are separate services that sit alongside the EDC.
Yes, through a secure link in the browser with no app, plus reminders, quiet hours and completion windows.
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