Know when your
brain works best
Performance intelligence API. One call returns your cognitive peak, natural dip, and optimal schedule — built on sleep science and chronobiology.
POST https://api.whenpeak.com/api/v1/predict
{
"sleep_time": "23:00",
"wake_time": "07:30",
"sleep_quality": "good"
}{
"dps": 74,
"peak_1": { "time": "10:00" },
"peak_2": { "time": "16:30" },
"dip": { "time": "14:00" },
"chronotype": "Third Bird",
"confidence": "low",
"upgrade_prompt": "Connect Apple Health for 3x more accurate predictions."
}Simple by design
Three inputs. One prediction. Know your peak.
Share your sleep
Send last night's sleep time, wake time, and quality. Or a screenshot from Apple Health, Oura, or WHOOP.
WhenPeak analyses
The Two-Process Model calculates your circadian phase and homeostatic sleep pressure to map your 24-hour performance curve.
Get your peak
Peak windows, dip times, chronotype, and a 7-day outlook. Confidence score included so you know how much to trust it.
Integrate in minutes
One endpoint. Clean JSON in, structured prediction out. Works with any language, any framework, any AI agent. No wearable required to start.
curl -X POST https://api.whenpeak.com/api/v1/predict \
-H "Content-Type: application/json" \
-d '{
"sleep_time": "23:30",
"wake_time": "07:00",
"sleep_quality": "good",
"exercise_yesterday": true,
"exercise_timing": "morning"
}'Works where you already work
WhenPeak runs inside the tools your users are already in.
ChatGPT
Available now as a GPT Action. Users ask in plain English and WhenPeak predicts their peak — no app required.
Claude
MCP server deployed. Remote integration rolling out as Anthropic opens the pathway to all users.
Any AI agent
OpenAPI spec published. Any LLM with function calling can integrate WhenPeak in minutes.
Built on peer-reviewed science
The Two-Process Model (Borbély 1982) governs every prediction. Process C tracks your circadian clock. Process S tracks homeostatic sleep pressure. Their interaction produces your 24-hour performance curve — calibrated to your chronotype.
- —Sleep quality, duration, consistency, and debt
- —HRV relative to your 30-day personal baseline
- —Exercise timing and chronotype classification
Simple pricing
Start free. Scale when you're ready.
For developers and early exploration
- ✓1,000 API calls / month
- ✓Stateless predictions
- ✓OpenAPI spec
- ✓Community support
For products with real users
- ✓50,000 API calls / month
- ✓Authenticated user predictions
- ✓30-day personal baselines
- ✓7-day performance forecasts
- ✓Webhook support
- ✓Email support
For high-volume integrations
- ✓500,000 API calls / month
- ✓Everything in Growth
- ✓White-label available
- ✓Dedicated support
- ✓SLA
Enterprise or white-label? hello@whenpeak.com
Your peak is predictable.
Start with one API call. No account required.