Blocks vs intervals.icu
Choose Blocks if you want an assistant that reads your real data and cites its sources, or you already live in Claude and want it to see your training — without another monthly subscription. Choose intervals.icu if you want the deepest free analytics and will do the planning yourself. Blocks syncs with it.
Can you use both?
Yes, and that is the most common setup. Connect intervals.icu in Blocks: your history, rides and planned events come in, and sessions you plan in Blocks go back to the intervals.icu calendar, which forwards them to Garmin, Zwift and the rest.
Side by side
Blocks
intervals.icu
Questions
What is the difference between Blocks and intervals.icu?
intervals.icu: No built-in AI: deep analytics with an open API. Blocks: Built around an assistant that reads your calendar, rides and readiness, plans and adjusts the week, and answers from a sourced sports-science base with evidence levels. It shows every change and asks before writing.
Should I choose Blocks or intervals.icu?
Choose Blocks if you want an assistant that reads your real data and cites its sources, or you already live in Claude and want it to see your training — without another monthly subscription. Choose intervals.icu if you want the deepest free analytics and will do the planning yourself. Blocks syncs with it.
Can I use Blocks and intervals.icu together?
Yes, and that is the most common setup. Connect intervals.icu in Blocks: your history, rides and planned events come in, and sessions you plan in Blocks go back to the intervals.icu calendar, which forwards them to Garmin, Zwift and the rest.
How much do Blocks and intervals.icu cost?
Blocks: Free app and MCP connector. In-app assistant on prepaid credits from $10.99, no subscription. intervals.icu: Free; supporter tier $4/mo.
Read off each app’s own site, September 2026. Spotted something out of date? m@blocks.zone