Curve · Research preview · Updated April 2026

Curve is a real-time drug timeline. Log what you took. Know where you are.

Curve shows you onset, peak, comedown, and afterglow in real time — for any drug, scaled to your body. Caffeine, Adderall, MDMA, ibuprofen. Whatever you put in your body, Curve tracks it. Anonymous accounts, no ads, no third-party tracking, no data sales.

What Curve does

• Live pharmacokinetic curves. Models absorption, peak (Cmax / Tmax), and elimination (half-life) for the substance, dose, and route you log.
• Combination checker. Flags known interactions between common substances before you mix them.
• Private journal. Records Shulgin ratings, intentions, and outcomes for personal review over time.
• Anonymous accounts. Username and password only. Email is optional and hashed if provided.
• Full data portability. Export every record as JSON or schedule deletion with a 7-day grace period (GDPR / CCPA compliant).

Frequently asked questions

What is Curve?

Curve is a free, private web app that estimates how psychoactive substances move through the body over time — onset, peak, comedown, and afterglow — based on the user's weight and self-reported sensitivity. It is a harm-reduction planning tool, not a medical device.

What is a pharmacokinetic curve?

A pharmacokinetic curve plots the concentration of a substance in the body over time. It shows absorption, peak concentration (Cmax / Tmax), and elimination (half-life). Curve renders an approximated version of this curve for harm-reduction planning.

Is Curve free?

Yes. Curve is free to use, has no ads, no third-party tracking, and does not sell user data.

Can I use Curve anonymously?

Yes. Curve does not require an email address, real name, or phone number. You can create an account with a username and password only.

Read the full FAQ. Curve is not medical advice and not for emergencies. Terms · Privacy · Contact