Start with the decision you need the product to make
McMillan Running provides a plan library, pace calculator and training calendar through its current official product. 26weeks.ai is designed around an adaptive AI coach that can use the athlete's goal, completed training and connected data. Product details change, so confirm current features on the McMillan training-plans page and McMillan dashboard page before buying.
Use a seven-day comparison
Create the same goal and available week in both products. Check whether the opening load resembles current training, whether an easy day stays easy, how a missed session is handled and whether the explanation teaches you what changed. Do not compare dashboards alone.
Choose McMillan when its established plan structure and calculator solve the job with less friction. Choose 26weeks.ai when adaptive coaching and connected training context are the higher-value need. Choose a human online running coach when the problem requires recurring individual judgment outside an app's scope.
Publisher disclosure: 26weeks.ai publishes this comparison. Provider feature descriptions come from the linked official pages; product-fit judgments are our interpretation. McMillan also offers coaching products and plans delivered through Final Surge. Compare the exact plan or service and its human-support terms before changing systems. Do not stack two plans during a trial.