What changed, release by release.

First release on Google Play. Records, shows and shares your Polar H10 ECG, heart rate, R-R intervals and HRV. Everything stays on your phone.

• The Help page links to the privacy policy, this website and the support address.
• The live R-R, HRV and pNN50 tiles are on the ECG tab from the start.
• PDF with a hospital-style header, a paper line on every page, and 30 seconds of trace before each mark on sideways pages.
• The diary asks "When?" after a mark: just now, 1, 2 or 5 minutes ago.
• The viewer opens at a mark with 30 seconds before it and a step-back button.
• Files handed to other people carry the Fairest Heart name.
• Every small control has a 48 dp tap area; plainer words for TalkBack.
• Under the symptom chips: when to call the emergency number.

• The ECG tab fits the screen: trace, tiles, the recording bar at the bottom.
• Recordings as one card per day, overnight nights on both days, one combined PDF per day.
• Overview: a baseline card after every stop, the usual range as a band behind the heart-rate line, pull to refresh.
• Strap battery chip turns amber under 20 % and red under 10 %, with the coin-cell type on the strap sheet.
• "Connection lost" everywhere, never "link lost".
• Renamed to Fairest Heart.

• Time ranges: a day, a session or any range on the Overview, with its own Share.
• Easy and Advanced interface modes.
• Plans: Free, Plus, Pro and a Support purchase, through Google Play.
• The first tab is ECG; HRV, accelerometer and strap panels are optional.
• Record on connect, on by default, with a switch on the strap sheet.
• Move a mark to the right second; multi-part diary labels; backdated marks.

• Dark look throughout, one type scale, big heart tiles on the Overview.
• Five-step first run: a statement, permissions with reasons, strap fit, keeping the recording alive per phone brand, connect.
• Every info sheet rewritten in plain language, the detail below it.
• The clock may jump back (travel, daylight saving) without a recording ever being overwritten.
• R-R tachogram in the EDF+ file, the PDF and the viewer.

• A new Bluetooth link that survives a night without losing samples.
• Insights: heart rate over the day, zones, Poincaré plot, signal quality, diary, last nights.
• Recording files carry the strap's true sample rate in their header.
• Hundreds of nights recorded by its first user before anyone else saw it.