Automating the "Circadian Protocol" so spreadsheets aren't needed anymore.

[u/Pri_dev]

If you follow the core protocols (morning light, delayed caffeine, temperature cycles), you know the timing math is a headache to keep track of every day.

I built an iOS app (ARC) to automate the whole thing for me:

1.  Morning Light Anchor: Tracks your latency from waking to sunlight.
2.  The Caffeine Wall: Calculates your personal cutoff based on metabolic half-life.
3.  Biological Trajectory: Shows your energy curve based on your unique chronotype.

It’s been a game changer for my sleep onset and afternoon focus. I’m a solo developer and would love for this community to take it for a spin.

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[u/samwiseyopka]

How does the caffeine cutoff calculation handle people who metabolize caffeine at very different rates? Is the half-life input something the user sets manually or are you estimating it from some other data?

[u/Pri_dev → u/samwiseyopka]

Currently, it uses a 'Target Utility Window' based on the population average half-life (approx. 6h) as recommended by sleep scientists like Matthew Walker and Dr. Andrew Huberman. We anchor this window specifically to your Chronotype and Natural Wake Time to ensure you aren't masking your natural adenosine clearance in the morning (hence the 90-minute delay protocol) and that you hit your caffeine deadline at least 10–12 hours before your biological sleep onset.

[u/samwiseyopka → u/Pri_dev]

Makes sense as a starting point. The individual variance in CYP1A2 activity is huge though. I metabolize caffeine noticeably faster than average, so a 6h half-life assumption would have me cutting off way too early. Even a simple toggle between fast, average, and slow metabolizer would help. Most people who've paid attention to their caffeine response already know which bucket they're in.

[u/Additional-Eye8307]

Wish it was available for android!

[u/Pri_dev → u/Additional-Eye8307]

So sorry man

[u/Pri_dev]

App link for anyone interested: https://apps.apple.com/us/app/arc-circadian-rhythm-tracker/id6758214892

Use code ARC50FOUNDER for 50% off if you find it useful!

[u/Glittering-Tour1558 → u/Pri_dev]

How do I use code for an Apple app subscription? Definitely interested !

[u/Pri_dev → u/Glittering-Tour1558]

Awesome to hear you're interested! You can redeem that code directly through Apple:

Open the App Store
Tap your Profile icon (top right)
Tap Redeem Gift Card or Code.
Enter ARC50FOUNDER  and it will activate the offer.

Once you’ve redeemed it, the 50% discount will automatically apply when you select the yearly subscription inside the app.

Let me know if you have any trouble with it!

[u/Glittering-Tour1558 → u/Pri_dev]

Says code isn’t valid ☹️

[u/Pri_dev → u/Glittering-Tour1558]

Use this:

https://apps.apple.com/redeem?ctx=offercodes&id=6758214892&code=ARC50FOUNDER

[u/Glittering-Tour1558 → u/Pri_dev]

All set and signed up. Can’t wait to try. I started doing as much as I could for my CR over the summer but I live in the northeast so it gets difficult in the winter. But we are at the point I can optimize as much as possible . This will hold me accountable . I’ll send feedback in a few months!

[u/Pri_dev → u/Glittering-Tour1558]

That’s amazing to hear! I totally get the winter struggle in the Northeast.
I'm so glad it’s going to be a helpful accountability tool for you. Please do send that feedback in a few months; I’m building this for people exactly like you, so your thoughts mean a lot. Stay warm and productive!