TrialsAlert vs ClinicalTrials.gov
Automated monitoring vs manual search
By Victor Lafforgue, Founder of TrialsAlert. Last updated March 2026. TrialsAlert is our product.
What is ClinicalTrials.gov?
ClinicalTrials.gov is a free, publicly accessible database maintained by the U.S. National Library of Medicine at the National Institutes of Health. It is the world's largest registry of clinical studies, containing over 400,000 trials across every medical condition. Researchers and sponsors are required by law to register their trials here, making it the most comprehensive source of clinical trial data available. Anyone can search the database by condition, treatment, location, or trial phase. ClinicalTrials.gov is an essential resource for the clinical research ecosystem, but it was designed as a registry — not as a patient monitoring tool.
How is TrialsAlert different from ClinicalTrials.gov?
ClinicalTrials.gov is a search engine. You go to it, enter a query, and browse results. TrialsAlert is a monitoring service. You tell it your condition once, and it watches ClinicalTrials.gov for you every day. When new trials appear or existing trials are updated, TrialsAlert's AI scores them across six dimensions — phase importance, breakthrough potential, patient accessibility, condition prevalence, sponsor credibility, and relevance — then classifies them as breakthrough, notable, or routine. Every Friday, you receive a plain-language briefing explaining what changed and why it matters. No medical jargon, no manual searching, no missed trials.
When should you use ClinicalTrials.gov directly?
ClinicalTrials.gov is the right choice when you want to search for a specific trial by NCT number, browse all trials for a condition without filtering, look up trial locations and contact information, or access the raw eligibility criteria and study design details. It is free and comprehensive. TrialsAlert is better when you want someone to watch the database for you and tell you what changed — especially if you do not have 5+ hours per week to search manually.
Can you use both together?
Yes — and many patients do. TrialsAlert monitors ClinicalTrials.gov on your behalf and surfaces what matters in a weekly briefing. When a trial catches your attention, you can look it up on ClinicalTrials.gov for the full details: eligibility criteria, locations, contact information, and study design. TrialsAlert also generates doctor-ready reports that include direct links to each trial's ClinicalTrials.gov page.