Cycle analysis by Lars von Thienen

Every market has a zeitgeist. Cycles tell you which one you are in.

Cycles IQ measures the cycles in a time series: which cycles are active, how stable they are, and where the next turns lie. Use it in the Cycles IQ app, from your code and from your AI assistant, run it in your own environment, or build with the help of our team.

Start now The three ways in

Author of Decoding the Hidden Market Rhythm, Parts 1 and 2 · Finalist, Technical Analyst Awards 2022, two categories · Board member, Foundation for the Study of Cycles

Three ways in

Choose how you work with Cycles IQ.

Cycles IQ App, API and MCP

Build your own cycle dashboards.

The new Cycles IQ app with your own dashboards and cycle scoring templates, and the cycle model on demand for your code and your AI assistant: Claude, ChatGPT, Cursor and others. Register and start right away: a free account begins with a 30-day trial, then continues on the Free plan. The app is included; on pay as you go you pay for your API and MCP usage, by the token.

The Cycles IQ app: your own dashboards, scoring templates and lenses
Cycle scan, cycle explorer, filters and the consensus score
REST API and MCP server, one account for both
The public Cycles API skill for your AI coding tool, free on GitHub
FSC members have their own free plan
Personal licence: for your private use, not for professional or commercial work

About the API

Start now

Cycles IQ Membership

Individual filters, scans and alerts in your own environment.

Download the Cycles IQ backend and run it on your own infrastructure, next to your own data and systems. Configure your own flows and scripts: the filters, scans and alerts that run on your markets. Built for heavy use: your API and MCP usage costs half the pay as you go price, with higher limits.

Everything of the app, the API and MCP
Half the token price on your API and MCP usage, with higher limits
Your own flows and scripts: filters, scans and alerts
Private skill files for your AI tools
The Cycles IQ backend for your own infrastructure, with updates
The Cycles Knowledge Graph, stage by stage as it lands
A 2-hour onboarding session with Lars
Personal licence: for your private use, not for professional or commercial work

Learn more

Request an introduction

Cycles IQ Pro Membership

Everything, plus knowledge and development support.

Additional knowledge on how to use cycles in the markets, and development support to ramp up your own environment with the help of our team. The Pro Membership is the licence for professional work.

Everything of the Cycles IQ Membership, the half token price included
Commercial licence: for professional and commercial use in your business, fund or organisation
Regular sessions with Lars
Development support from our team for your own dashboards and tools
Cycle trading knowledge for your markets

Request an introduction

How it starts. The Cycles IQ Membership and the Pro Membership begin with a short questionnaire and a 30-minute call with Lars. The method is proprietary, so both begin with a signed NDA.

Licence. The app, the API and MCP and the Cycles IQ Membership are licensed for private use. Professional and commercial use needs the Pro Membership.

Lars von Thienen, creator of Cycles IQ and developer of the WhenToTrade cycle engine, author of *Decoding the Hidden Market Rhythm*, board member of the Foundation for the Study of Cycles

Method and background

Measured, not assumed.

Every reading starts from the data: detect the dominant cycles in a series, score their stability, locate the current phase, and only then project. The same routines run in the research, in the analyzer and behind every API call. Cycle lengths are not fixed in advance; they are found in the data and re-measured as it changes.

Every market moves in cycles, and the cycles morph: a length that dominated a series for two years fades, another takes over, and the right side of the chart no longer matches the one you calibrated on. For twenty-five years I have built the detrending, spectral and validation routines that measure this in the here and now instead of assuming it. What changed is the application layer: with the method encoded as skills, you describe the screen and the AI builds it. The measurement took decades. Using it takes an afternoon.

Not sure which way fits?

Tell Lars who you are and what you want to measure or build. He replies in person. The research newsletter is open to everyone.

Request an introduction Subscribe on Substack

Write to Lars: cyclesiq@marketzeitgeist.com