Five minutes. Back sharp. Restack is guided meditation timed to your deep-work cycle — not a wellness app, a performance tool.
Free during beta · iOS & Android · No subscription required
Restack
Ultradian Reset
remaining
01 — Our position
The ultradian rhythm — identified by sleep researcher Nathaniel Kleitman in the 1950s — cycles your brain through peaks and troughs of cognitive performance every 90 to 120 minutes. The peak is where flow lives. The trough is a signal: step back, or the next ninety minutes cost you.
Most engineers don't step back. They scroll. They context-switch. They open a new issue. None of it is rest — it's just different cognitive load. The fatigue compounds. By late afternoon, you're writing code that embarrasses your morning self.
Restack was built for a narrow, specific thing: a five-minute guided session between deep-work cycles that actually restores directed attention. Eyes closed. Guided. Designed for engineering brains that find wellness-app language grating. No mantras. No nature sounds unless you want them. Just the neurological mechanism, applied.
"The engineers who ship the cleanest code over long careers aren't grinding harder. They're managing their cognitive system with the same rigor they apply to their production systems."
The science behind five minutes
of global knowledge workers report feeling overworked
Microsoft Work Trend Index, 2021
improvement in attention scores after guided mindfulness micro-breaks
University of Washington, 2012
ultradian cycle — your brain's natural peak-to-trough rhythm, identified by Kleitman
Basic Rest-Activity Cycle research
02 — The protocol
No new habit to build. You're already taking breaks — Restack makes them count.
Open Restack before you begin. The timer runs in the background. No mode switching, no setup ritual.
At the 90-minute mark — or when you signal your focus has slipped — Restack queues a session. You finish the thought you're on. Then you stop.
A guided body scan, breathwork sequence, and focus re-entry prompt. Engineered to leave you in a better cognitive state than when you sat down.
03 — What's inside
04 — Early access feedback
"I used to call my afternoon slowdown burnout. It was just me ignoring my ultradian trough for three years. After two weeks with Restack, I'm shipping more by 4pm than I used to by end of day."
Dmitri K.
Principal Engineer, Series B fintech
"I was skeptical. I wrote Vim plugins in my spare time — I don't do wellness apps. This isn't a wellness app. It's a cognitive maintenance schedule."
Priya N.
Staff SWE, infrastructure team
"The focus re-entry prompt is weirdly effective. Asking me 'what's the one thing that would make today's code feel done?' before I pick the keyboard back up changes how I approach the next block."
Marcus B.
Engineering lead, 8-person startup
"I tried Endel, I tried binaural beats, I tried just walking around the block. None of them got me back into the problem. Restack does."
Leila T.
Senior SWE, remote, ex-Google
"The haptic cue on Apple Watch is understated genius. I keep my phone face-down in flow and this is the only thing that respects that."
Jonas W.
Freelance backend engineer
05 — Pricing
During private beta, Restack is completely free. We'll notify waitlisted engineers before any paid tier launches — and early users get 60 days free on any future plan.
06 — Questions
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Join 1,200+ engineers on the waitlist. Free during beta. Ships iOS and Android.
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The Stack
Cognitive fatigue is one of the leading causes of bugs, missed edge cases, and poor architectural decisions — but most engineers push through anyway. Research shows that even micro-recovery sessions between deep-work cycles can measurably restore attention and executive function. Here's what the science says and how to put it into practice.
You're still typing, the cursor is still moving, but your brain quietly checked out 20 minutes ago. Software engineers are notoriously bad at recognizing the early warning signs of cognitive fatigue — and the cost shows up in pull request reviews the next morning. Here are 10 tell-tale signals that a 5-minute reset is exactly what your prefrontal cortex is asking for.
Most meditation content is built for a different audience — and engineers know it. If the word 'chakra' has ever made you close a wellness app, you're not alone. This guide strips mindfulness down to its neurological fundamentals and shows exactly what happens in your brain during a structured 5-minute breathing or body-scan break.