Lifestack

lifestack.ai ↗

A daily planner that builds your schedule around energy, sleep and focus data.

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SI Score: 75/100
Pricing: Not confirmed
Free plan: Not confirmed
Sign-up required: Not confirmed

Ask SI about Lifestack

Answers use saved listing facts and recorded sources.

Homepage screenshot

SI REVIEWBased on the site's own pages, in a directory managed by people

What it does

Lifestack is a smart daily planner app that reads your sleep, recovery and focus data, then drafts a schedule that puts the right work at the right time. It groups work into Energy Zones, shows wearable health data next to your calendar, and maps meals and rest around the demands of the day. A chat copilot answers daily planning questions in context. It runs on iPhone, Mac, Android and Chrome, and there is a Mac desktop download. Lifestack is a paid app with a 7-day free trial.

The signup page lists plans at $10 per month, $50 per year and $120 for lifetime access, after a 7-day free trial. The home page points to iPhone, Mac, Android and Chrome, and offers a Mac app download plus an app signup link. The about page names Nao Yukawa as co-founder and CEO and Hayato Waki as co-founder and CTO.

Best for

Aligning demanding work with peak energyPlanning meals and rest around the day's demandsViewing wearable health data beside a calendar

SI Score

75/100

#110 in Business & Productivity

Based on published information. No hands-on task test.

Method 2.0 · Published source review Assessed Oct 28, 2026Score ceiling for this evidence: 84/100.

Product usefulness 75

Evidence

Lifestack uses sleep, recovery and focus data to draft a daily schedule and organize demanding work into energy zones. This gives users identifiable planning inputs and a schedule output. Retained sources do not establish conflict handling or calendar-edit controls, so the assessment remains in the inputs-and-outputs band.

Limits: Source-researched AI assessment reviewed by a separate native AI worker. No hands-on product test or human verification is claimed.

Source links and check dates are in Sources and checks below.

Separate website checks

These checks do not add points to the SI Score. They inspect the website's HTML, not the product in use.

Basic website checks75/100

HTTPS: yes
Homepage answered with HTTP 200
Privacy policy link: not found
Terms link: not found
Contact or about page: found

We check that these pages exist, not what they say. Ownership and company details are not verified.

Checked Oct 18, 2026.

HTML accessibility checks56/100

Page language set: en
Mobile viewport: yes
Images with a text alternative: 2 of 138
Main heading (h1): no

Automated checks on the homepage HTML only. This is not a full accessibility audit.

Checked Oct 18, 2026.

Homepage HTML response100/100

First byte after 23 ms
Homepage HTML loaded in 0.1 s
HTML size 524 KB

Measured once from our server. Images, scripts and your own connection are not included.

Checked Oct 18, 2026.

Trackers in homepage HTML76/100

Third-party trackers in the homepage code: Google Tag Manager, Meta Pixel

Only the homepage HTML is checked. Trackers loaded later by scripts, and what the service does with your data, are not covered.

Checked Oct 18, 2026.

Page date hints100/100

Server says last modified: Sat, 17 Oct 2026 20:06:18 GMT

A copyright year is a weak sign of upkeep. It does not prove the content is current.

Checked Oct 18, 2026.

Policy links do not verify a company's conduct. An HTML response time is not application speed. Tracker and accessibility checks miss behavior after page load. Copyright dates do not prove product upkeep.

How the SI Score works →

Unconfirmed details may be unassessed, absent from the pages checked or temporarily unreadable. A missing price does not mean the service is free.

Sources and checks

Supporting pages for product usefulness, site facts, prices and separate website checks. Each record keeps its own date. Reading a page does not establish how well the product performs in use.

lifestack.ai/
- Product usefulness evidence
- Basic website checks (separate check)Checked Oct 18, 2026
- HTML accessibility checks (separate check)Checked Oct 18, 2026
- Homepage HTML response (separate check)Checked Oct 18, 2026
- Trackers in homepage HTML (separate check)Checked Oct 18, 2026
- Page date hints (separate check)Checked Oct 18, 2026

Checks without a source link

PricingUnknownChecked Oct 18, 2026
Free planUnknownChecked Oct 18, 2026
Sign-up requiredUnknownChecked Oct 18, 2026
PlatformsUnknownChecked Oct 18, 2026
APIUnknownChecked Oct 18, 2026
Open sourceUnknownChecked Oct 18, 2026

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