Ambulatory Heart Monitor Companion

What you felt.
Right when it happened.

Holter Monitor Symptom Log timestamps every symptom while you wear your Holter or other ambulatory heart monitor, so your cardiologist can match what you felt against the recording — down to the minute.

Coming Soon to the App Store
Why Holter Log

Built for one job: an accurate log your cardiologist can trust.

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Log It Hands-Free

Say “Hey Siri, log palpitations in Heart Log” — even from the lock screen. Siri also answers to “Symptom Log” and “Holter Log,” or a custom phrase you set up yourself via Shortcuts or the Action button.

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Timestamped to the Minute

Every entry records exactly when a symptom happened, with the option to adjust the time if you logged it a moment late. That precision is what lets your doctor line your symptoms up against the monitor's data.

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Organized by Session

Start a new monitoring session each time you put the monitor on, and review past sessions any time. Nothing gets mixed together between wears.

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Print-Ready for Your Doctor

Generate a clean, printable log of your session in one tap — ready to hand in with the monitor at your follow-up appointment.

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Private iCloud Sync

Your log syncs across your devices through your own private iCloud account. It's never sent to the developer or any third party, and the app keeps working offline if iCloud isn't reachable.

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Edit and Undo

Tap any entry to correct it, and deletions come with a quick Undo — so a stray tap never costs you a symptom you need in the log.

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Apple Health Integration

Turn on HealthKit sync and your logged symptoms — palpitations, dizziness, chest pain, shortness of breath, fainting — are written to Apple Health as symptom entries, right alongside your heart rate and rhythm data.

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Export to CSV

Export any session — or your entire log — as a CSV file in one tap. Email it, save it to Files, or open it in a spreadsheet to review with your cardiologist or keep for your own records.

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Back Up & Restore

Create a complete backup of your log whenever you want and restore it on this device or a new one — separate from iCloud sync, so you always have a copy that's entirely in your control.

Symptoms You Can Log
Palpitations Dizziness / Lightheadedness Fainted Chest Discomfort / Pain Shortness of Breath Exercise-Related Other

Coming soon.

Holter Monitor Symptom Log is in final development and headed to the App Store soon.

Coming Soon

Holter Monitor Symptom Log is a personal record-keeping tool and is not a substitute for professional medical advice, diagnosis, or treatment. It does not connect to or read data from any monitoring device. Always follow your physician's instructions while wearing a Holter or other ambulatory monitor.

Privacy Policy

Last updated: July 29, 2026

This Privacy Policy describes how Holter Monitor Symptom Log ("we," "us," or "our") handles information when you use our mobile application ("the App"). We are committed to being transparent about our practices, especially given the sensitive, health-related nature of the data you log.

01 Information We Collect

Holter Monitor Symptom Log does not require you to create an account or provide any personal details to use the App. The App does not collect or transmit any information to the developer.

The data you enter — symptom type, timestamp, session, and any notes you add — is stored locally on your device and, if you're signed in to iCloud, synced to your own private iCloud database. This data is never sent to us or to any third party.

02 Third-Party Services

Holter Monitor Symptom Log uses Apple's iCloud (CloudKit) solely to sync your log privately between your own devices. We do not use advertising networks, analytics SDKs, or any other third-party service, and no data leaves Apple's ecosystem under your own account.

03 Siri & Shortcuts

When you log a symptom by voice using Siri or a Shortcut, that request is processed by Apple's Siri and Shortcuts frameworks on your device (or Apple's servers, per Apple's own Siri privacy practices) to create the entry in the App. We do not receive a copy of your voice recordings.

04 Apple Health (HealthKit)

If you choose to turn on Apple Health integration, the App requests your permission to write symptom entries to HealthKit. This only happens after you explicitly grant access in iOS, and you can revoke it at any time in Settings → Privacy & Security → Health.

Data written to HealthKit is stored by Apple on your device under Apple's HealthKit privacy protections, not by us. We do not read any other data from Apple Health, and we never receive a copy of your HealthKit data.

05 Data We Do Not Collect

We want to be explicit. Holter Monitor Symptom Log does not collect:

06 Children's Privacy

Holter Monitor Symptom Log is not directed at children and is not knowingly used to collect information from children under the age of 13.

07 Data Retention & Deletion

Because your log lives in your own local storage and private iCloud database, you are always in control of it. Deleting an entry or session removes it permanently. Deleting the App removes all local data; you can also remove synced data from iCloud through your device's iCloud settings.

When you export a CSV file or create a manual backup, that file is generated on your device and shared only through the destination you choose — such as Mail, Messages, or the Files app. We never see or receive a copy of it.

08 Security

Your data is protected by Apple's standard on-device encryption and the security of your private iCloud account. We have no server of our own and no access to your data at any time.

09 Changes to This Privacy Policy

We may update this Privacy Policy from time to time. Any changes will be reflected by updating the "Last updated" date at the top of this page. We encourage you to review this policy periodically.

10 Contact Us

If you have any questions or concerns about this Privacy Policy, please contact us at:

📧 holtermonitorsymptomlog@icloud.com