Joe Griffin

Caffeine has a half-life of ~5–6 hours for most people. That 3pm espresso? Half of it is still active in your system at 9pm. A quarter of it is still there at 2am. You're not bad at sleeping. You're caffeinating too late. Clarity is built around this science. Re-launching on Product Hunt in 6 days.

Most people drink coffee when they're already tired. That's the problem. Your body doesn't respond to caffeine the way you think it does. The timing is almost always wrong and the cost shows up in your sleep, your mood, and your next day's focus. We built something to fix that and it re-launches in 7 days.

I'm Joe, the founder of Clarity: Caffeine and Focus, and I'm genuinely excited to be back. We finished 3rd on Product Hunt last time, and since then I've been heads-down rebuilding the core experience based on what users actually needed. What Clarity does: Most people caffeinate by habit. Same time every day, regardless of how they slept, what they're doing, or when they need to perform....

We're the most caffeinated generation in history, and also the most health conscious. We already track macros, steps, reps, heart rate and sleep. But there's a hidden variable that effects every single one of these metrics that nobody has even considered. Caffeine is a potent performance enhancer, that gives me tremendous benefits in both my mental and physical activities, and that's because I...

While I pride myself in Clarity being the first of it's kind, I'm also extremely excited that we are currently building the worlds first data set of verified caffeine products and spotlighting brands for actually knowing the caffeine content of their drinks. There are some other 'caffeine trackers' in the wild, but they all pull their data from the same available data set which is unfortunately...

This isn't a detox. It's not about quitting. It's a 7-day challenge to understand your actual caffeine habits and how they're affecting your performance. Here's how it works: Days 1-3: Awareness Log every coffee, tea, and energy drink in Clarity. See how much is still active at bedtime. No changes yet, just observe. Days 4-5: Pattern Recognition Clarity shows you the invisible patterns. Late...

Many of us have transitioned to knowledge work and most of us, if not all, rely on caffeine to boost our mental performance. If it weren’t so effective we wouldn’t drink it. We know caffeine is particularly effective for combating fatigue and improving focus. But what if it could be even more so? The first step is raising awareness about the daily habit we consume without fully understanding...

The UK's productivity culture is built on caffeine. But almost nobody understands how it actually works. We know caffeine blocks adenosine. We know it has a half-life. But we don't track when we drink it. We don't see how much is still active at bedtime. We don't connect poor sleep to yesterday's 4pm coffee. The result? A culture of perpetual fatigue, masked by more caffeine, creating worse...

Clarity is re-launching. What started out as a small idea rattling around in my head has became a fully fledged intelligence system centred around tracking caffeine. Clarity is a world first. Look out for the next launch on 14th March. Best, Joe

All, I've been quiet, and I won't apologise for this, It's because I've been making Clarity better than ever. People resonated with the idea, but I don't believe the app was good enough. So I've been deep at work rebuilding the app from the ground up. I have a vision, that I can help as many people as possible stop being controlled by caffeine, and let it propel them to do great things. The new...

Evening all, I'm extremely excited to announce that Clarity's next major update has been submitted to Apple. This updates sees the integration of Apple Health and iCloud. This will allow you to write caffeine data directly to apple and read your HRV and RHR in the 'trends' tab and make correlations between higher caffeine intakes and changes to your heart activity! The new SleepView provide...

Hi all, How quickly the first full week of January has nearly came and gone. Some really exciting things happening with Clarity, some of you may have noticed an update was pushed. Mainly ui refinements for this week, and a free trial has been added for anyone wanting to give Clarity plus a try. Clarity is really starting to own its place as a performance application, with caffeine tracking at...

To everyone following Clarity's journey, I'm heading back into dev mode, which means I'll be un-contactable and off social media platforms. I'll be posting updates here every Friday. Look out for new versions of Clarity, they're are some really, really cool things coming. Best, Joe

Happy new year all. I'm sure everyone is locked in ready to hit their goals in 2026. The official launch of The Caffeine Reset is this Sunday - 4th January 2026. If you're ready to start using Caffeine with intention, learn about its effects on your performance and recovery and be one of the pioneers blazing a trail to revolutionise our relationship with Caffeine, Clarity is the place to be....

Guys, I'm looking for some knowledge workers to get involved in helping to shape Clarity! If anyone is interested, let me know in the comments!

Guys, I'm looking for some athletes to get involved in helping to shape Clarity! If anyone is interested, let me know in the comments!

To all Clarity's new followers, I've been truly humbled by your support. I've been developing Clarity alone for well over 13 months now. To have it be presented and receive such positive feedback has been unreal. Clarity is a long term project, designed to truly change our relationship with caffeine. I can't stress enough, it is not about quitting caffeine. I want to keep an open forum here so...

Introducing Clarity Intelligence Most people track steps, sleep, and calories. Almost no one tracks the caffeine driving all of it. Clarity Intelligence changes that. It analyses your past 14 days of caffeine intake, timing, decay, bedtime levels, and journal trends then gives you clear, personalised insights based entirely on your actual behaviour and your chosen Performance Profile. No...