Chain records the cue, the sitting, and what it paid off — so you and your therapist can work with data instead of a streak counter.
A sitting is one decision chain — vulnerability, prompting event, links, behavior, consequence. Chain captures all of it, then exports a worksheet your therapist can actually read.
At the start: what just happened (prompting event), who is here, urge 0–10. At the end: urge again, what it paid off, and what you tried first. That craving delta is the test.
Reads your heart rate, HRV, sleep stages, respiratory rate, and SpO₂ at session start. Writes mood data to Apple Health Mindful Sessions — 38 emotions, fully mapped.
Pull your readiness score, HRV trend, resting heart rate, and detailed sleep stage breakdown (REM, deep, light) directly from your Oura Ring at session start.
Program any NFC tag with Chain. Tap it anytime during a session to log a hit — with a note prompt asking why. Discreet, fast, hands-free.
Export reads like a board a therapist writes on: vulnerability, prompting event, links, sitting, consequence, craving change. Patterns are labeled "possible hypothesis — not a diagnosis."
Your active session lives on the lock screen and in the Dynamic Island. See your elapsed time, hit count, and log another hit without unlocking your phone.
Each one maps to a node in the chain. Together they answer the only question that matters: what function does this serve?
Questions 1 and 2 are the antecedent. Question 3 is the test. Question 4 is the intervention attempt. Together they produce a complete chain — the same structure a therapist draws on a whiteboard.
The quit-app market made the same choices. These are the ones Chain refuses to copy.
A logged sitting becomes a "confession" that resets a streak. Chain never counts days clean — it logs what happened. A lapse is data, not a failure.
It's useful as a side calculation. As a headline it hides function. The 2026 app review found money-saved was the category default across all cannabis cessation apps.
Chain records method, hits, and duration. It does not suggest strains, dosages, or products. The before-and-after is aimed at the behavior's payoff, not the cartridge.
Chain has not been studied as a treatment. The methods underneath it have been. The clinical sentence is "one sitting, the whole chain." Not "this will help you quit."
Every screen is designed around one question: what do you actually need to know right now?
Chain maps 38 emotions to Apple Health's State of Mind API — so your mood during sessions lives alongside your heart rate, sleep, and HRV in one place your doctors can see.
Generate a shareable web report with a time-limited link. Your therapist sees your session notes, hit timeline, urge levels, and biometric context — without needing an app.
Chain's design choices map onto specific published findings — not the general "tracking apps work" claim.
Craving at one assessment predicted cannabis use at the next. Craving, withdrawal, and negative affect were lower after use. Positive affect did not reliably rise. 61.2% of use was social; 94.5% of that occurred when others were using.
Across 138 randomized studies and 19,951 people, interventions that increased monitoring of goal progress also improved goal attainment (d+ = 0.40), and the change in monitoring frequency mediated that effect.
An effective chain is collaborative, complete enough to include internal and external cues, and treated as a hypothesis that new information can discard. A pattern that later sittings don't fit should be discarded.
Chain is in active TestFlight development. Here's what's shipped.
.nervous → .anxious, dropped .bored and .dailyLifemetadata: nil parameter to HKStateOfMind initializerChain is in active TestFlight beta — built for adults working with a therapist on clustered cannabis or nicotine use.
iOS 18+ required · Private data stays on device and iCloud · No accounts