from Hacker News

Reflect is an iOS app that allows you to track any data you can think of, and then gain insights from that data -- whether it's your mood, symptoms, activities, events, performance, supplements, habits, or weight. We have a page describing the following features in more detail [1]

Major Features:

• Free unlimited custom tracking: Unlike other apps, recording your data with Reflect is completely free; you can track as much as you'd like and you are only limited by your imagination.

• Visualization: See trends in your data and identify relationships between metrics.

• Correlations: Learn which metrics correspond most highly with anything you track. Answer questions like "am I more productive on days I wake up earlier?" or "how does spending time outside affect my ability to concentrate?".

• Get started immediately: There is no "signing up" step; just specify what your data looks like and begin recording.

• Extreme privacy: All data storage and analysis are performed locally on your device.

• Extreme flexibility: Reflect lets you construct forms that are specifically tailored to your needs. There are no limitations such as tracking only once per day, or having only a few things to choose from.

• Free importing: Migrate to Reflect and import your CSV data with ease with Reflect's template builder, enabling you to reap the benefits of Reflect's visualizations and insights immediately.

• Free exporting: There is no lock-in with Reflect. You are free to leave at any time; we want the qualities of the app to speak for themselves and serve the parts of you that want quality and control.

[1] - https://ntl.ai/reflect