LogZero

A new kind of personal tracker

Track Everything.
Share Nothing.

The private, all-in-one iOS tracker for moods, meds, food, exercise, meditation, weight, todos and more. Safe, private and secure by default.

Scan with your phone
to open in the App Store

iPhone · iOS 16.4+ · No account required

Cyberpunk theme
LogZero theme
  • 100% on-device
  • No accounts
  • No ads
  • No tracking
  • App Privacy: Data Not Collected

Why LogZero is different

Most "private" trackers still upload your data.

For LogZero, privacy is not an afterthought - it's in the app's DNA.

App Category Privacy Security All-in-one Pricing
Mood Trackers Cloud, analytics Moderate No Freemium · ~$40/yr
Food Trackers Cloud, ads, analytics, data sales Moderate, breach history No Freemium · ~$60/yr
Exercise Trackers Cloud, ads, analytics, data sharing, social-default Moderate, breach history No Freemium · ~$50/yr
Meditation Trackers Cloud, analytics, ads in free Low No Freemium · ~$65/yr
Todo Trackers Cloud, analytics Low No Freemium · ~$50/yr
Medication Trackers Cloud, analytics High, some HIPAA-aware No Freemium · ~$40/yr
Weight Trackers Cloud, analytics Moderate, breach history No Freemium · ~$30/yr
LogZero That's us On-device, no telemetry Very High, local sandbox, iOS AES-256 at rest, Argon2id + AES-256-GCM encrypted backups, Face ID & passcode lock Yes Free · $5/mo · $35/yr · $49 lifetime

  • LogZero

    That's us
    Privacy
    On-device, no telemetry
    Security
    Very High, local sandbox, iOS AES-256 at rest, Argon2id + AES-256-GCM encrypted backups, Face ID & passcode lock
    All-in-one
    Yes
    Pricing
    Free · $5/mo · $35/yr · $49 lifetime

  • Weight Trackers

    Privacy
    Cloud, analytics
    Security
    Moderate, breach history
    All-in-one
    No
    Pricing
    Freemium · ~$30/yr

  • Medication Trackers

    Privacy
    Cloud, analytics
    Security
    High, some HIPAA-aware
    All-in-one
    No
    Pricing
    Freemium · ~$40/yr

  • Todo Trackers

    Privacy
    Cloud, analytics
    Security
    Low
    All-in-one
    No
    Pricing
    Freemium · ~$50/yr

  • Meditation Trackers

    Privacy
    Cloud, analytics, ads in free
    Security
    Low
    All-in-one
    No
    Pricing
    Freemium · ~$65/yr

  • Exercise Trackers

    Privacy
    Cloud, ads, analytics, data sharing, social-default
    Security
    Moderate, breach history
    All-in-one
    No
    Pricing
    Freemium · ~$50/yr

  • Food Trackers

    Privacy
    Cloud, ads, analytics, data sales
    Security
    Moderate, breach history
    All-in-one
    No
    Pricing
    Freemium · ~$60/yr

  • Mood Trackers

    Privacy
    Cloud, analytics
    Security
    Moderate
    All-in-one
    No
    Pricing
    Freemium · ~$40/yr

Comparisons based on analysis performed in mid-2026, comparisons utilize several of the top trackers for each category.

Convinced? Try LogZero free on iPhone.

What you can track

Seven trackers. One private home.

Seven trackers, plus a dashboard that ties them together and correlations (Beta) that find the patterns between them. Turn on what you care about; ignore the rest.

Mood

Log moods, emotions, and activities. None of it leaves your phone.

Medication

Schedule meds, hit adherence, get reminders. Locally.

Food

Calories, macros, label scanning, and presets. Never sold to brokers.

Exercise

Log workouts, estimate calories, hit daily targets. Privately.

Meditation

Lock Screen countdown, binaural beats, and streaks. On-device.

Weight

Daily weight, trend charts, lbs or kg. Yours alone.

TODO

Tasks with priorities, tags, and celebrations. Fully local.

Correlations Beta

See what affects your mood. Math runs on your phone.

Dashboard

Today, streaks, weekly deltas, and one quiet insight per day.

Try them all.

Free to start. No account required. Pro Annual comes with a 1-month free trial.

Exercise × Next-day mood Moderate

r = 0.59 · 90 days · today's exercise vs. tomorrow's mood

Exercise × Same-day mood Weak

r = 0.24 · 90 days · the lift shows up tomorrow, not today

Correlations · Beta

See what actually affects your mood.

LogZero computes statistical correlations between your trackers (exercise vs. mood, meditation vs. mood, meds vs. mood, exercise vs. weight, and more) entirely on your device. Discover the patterns no one else sees, because no one else gets to see them.

About correlations

Themes

Make it yours.

Light, dark, or match your system. Pro adds Solarpunk, Cyberpunk, and Hacker themes, each with its own animated effects you can switch off.

LogZero theme · Light
Solarpunk theme
Cyberpunk theme
Hacker theme

Security · Pro

Locked when you leave. Encrypted when you export.

Your data already never leaves your phone. Pro adds the locks a security-minded person expects on top.

  • Face ID or Touch ID app lock, with a passcode fallback
  • Auto-locks after 15, 30, or 60 minutes away
  • Encrypted backups: Argon2id key derivation, AES-256-GCM
  • Your passphrase never leaves your phone. Nobody can recover it, including us.
Read the privacy posture
Cyberpunk theme
Solarpunk theme

Seven private trackers. One iPhone app.

App Store privacy label

Nothing collected. Nothing tracked. Verifiable.

The privacy promise isn't a footer link. It's what Apple shows before you download.

Read the full privacy posture on our privacy page or read the policy itself.

How it works

Three steps. None of them harvest your data.

  1. 01

    Download

    Install from the App Store. No website signups, no account screen, no email request.

  2. 02

    Log what matters

    Pick the trackers you want. Mood, food, meds, exercise, meditation, weight, todos. Turn on what you care about; the rest stays out of view.

  3. 03

    See patterns

    Streaks, weekly deltas, correlations, "worth noticing" insights. All computed on your phone using local algorithms. All visible only to you.

Common questions

Security and privacy are always first.

Is LogZero really private?
Yes. Everything you log is stored on your device, where iOS encrypts it at rest with AES-256. The app makes zero network requests for your private data. We don't see it, sell it, or share it. The App Store privacy label declares "Data Not Collected" across every category.
Does LogZero require an account?
No account. No email. No sign-up. Open the app and start logging. Your data lives where it should: on your phone.
What can I track in LogZero?
Mood, medications, food (calories, macros, and micronutrients), exercise, meditation, weight, and todos. Plus a dashboard and statistical correlations (Beta) between them, all computed locally on your iPhone.
Does LogZero work with Apple Health?
Yes, one way. On Pro, LogZero can import your workouts, weigh-ins, and Move ring from Apple Health. LogZero reads; it never writes anything back.
How do I move my data to a new phone?
Export a backup file from Settings → Data & Backup. Pro can encrypt it with a passphrase first. Move the file via AirDrop, iCloud Drive, or any way you'd move a photo, then import on the new device. You stay in control of the transfer.
What's the difference between Free, Pro, and Lifetime?
Free gives you every tracker and your full history. Pro adds the extras: themes, App Lock, encrypted backups, Apple Health import, label scanning, binaural beats, and deeper customization. Pro is $5/mo or $35/yr, and the annual plan starts with a 1-month free trial. Lifetime is a one-time $49 purchase — no renewals, ever.

Your whole life,
on your device.

No account. No commitment. Your data stays yours.