By Orion Voss

Updated 2026-09-11

Best Apps to Track Heart Rate with Calendar Context in 2025 — and What Changed in 2026

If you searched for the best apps to track heart rate with calendar context in 2025, you were looking at a very small category — and one that has changed since. This is an honest account of what existed then, written in September 2026 with the benefit of hindsight, and a pointer to the current 2026 comparison. One thing up front: 70 BPM, the app this site is built around, did not exist in 2025. It launched in August 2026. So it is not on the 2025 list, and we are not going to pretend otherwise.

What “calendar context” meant in 2025

The strict definition has not changed: an app that reads your actual calendar and places heart-rate readings against the events that were running, so a reading is labelled with what you were doing. An app that only infers activity from motion or time-of-day is not doing calendar context, because it never sees the event. Very few apps met that bar in 2025, and most that appeared on “best of” lists did not.

The apps that genuinely read a calendar in 2025

Lifestack. The most complete calendar-aware app available in 2025: an AI day planner that synced Google Calendar and Outlook, pulled heart rate and sleep from Apple Health, Oura and Fitbit, predicted an energy curve and rescheduled tasks around it. It read and wrote the calendar. Subscription, account-based, server-side.

StressFace. An HRV stress tracker that could connect your calendar and map a stress score onto meetings and events. Calendar sync was a paid Premium feature. It output a score per event rather than showing the heart-rate trace.

Heart Calendar. The closest thing to a pure calendar overlay in 2025 — average heart rate per calendar event, read from Apple Health, free, no account. It had shipped in 2018 and had not been updated since February 2020, but it was still on the App Store, so anyone searching in 2025 could have found and installed it.

Exist.io. A web-and-iOS service that synced iOS calendar events and Apple Health heart rate, then ran day-level correlations against mood and other variables. A correlation dashboard rather than a per-event timeline, and a server-side subscription.

The apps that appeared on 2025 lists but did not read a calendar

Welltory was the biggest name in the space by ratings, and it correlated stress with activities including meetings — but by inference, not by syncing a calendar. Athlytic was a recovery and strain app with manual journal tags, no calendar integration. Bevel tracked heart rate, HRV and resting heart rate but in 2025 had no calendar integration at all; it added Google and iCloud Calendar reading in 2026. And Cardiogram, which many 2025 lists still recommended, was winding down: its team was laid off late in 2025, it was pulled from Google Play on 7 November 2025, and its App Store link was deactivated.

What changed in 2026

Three things. Bevel gained calendar reading, so the 2026 list is one app longer. Cardiogram finished disappearing, so anyone still on it needed an alternative. And in August 2026, 70 BPM launched with a narrower and more specific idea than any of the above: draw the heart-rate samples Apple Health already holds across your actual calendar events, on the iPhone, with no account, no server and no score — just the trace and the event it fell inside.

That last point is the real difference from the 2025 field. Lifestack, StressFace, Exist.io and Bevel are all cloud services with accounts. Heart Calendar was local, but abandoned. 70 BPM is the first actively maintained app in the category that keeps everything on the device, reading calendars already on the phone through iOS rather than connecting to Google or Outlook.

So what should you have used in 2025 — and what now?

In 2025, if you wanted your day rebuilt around your energy, Lifestack was the answer. If you wanted a stress score per meeting, StressFace. If you wanted the raw overlay and could tolerate an unmaintained app, Heart Calendar. Those recommendations still hold for those specific wants.

In 2026, if what you want is to see your heart rate against your calendar without uploading health data anywhere, that option now exists. The 2026 comparison puts all of them side by side, including the ones this page has just described.

Dates and product facts on this page reflect App Store listings and vendor announcements as read in September 2026. 70 BPM is not a medical device and does not diagnose anything.

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