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Show HN: Happy Scale – Use moving averages for accurate weight loss predictions

19 pointsby rooster8almost 10 years ago

7 comments

kevinalmost 10 years ago
Whoa, this app is feature packed. It&#x27;s all pretty straight forward except for this part in the beginning :<p><a href="http:&#x2F;&#x2F;cl.ly&#x2F;image&#x2F;1d3q2Q3S0029" rel="nofollow">http:&#x2F;&#x2F;cl.ly&#x2F;image&#x2F;1d3q2Q3S0029</a><p>Why would I click on the hamburger menu icon to add a weight? Seems like I should hit the + button on the top right? In fact, it seems incorrect since it did what I expected, which was slide out the navigation. The + button, did ask me to add weight.<p>One thing I wanted (and maybe you have it?) was the ability to set a regular notification to remind me to weigh myself. Also, for the deluxe edition what are the other features besides removing the ads? I couldn&#x27;t find what those would be. It showed up a nice list of them when I hit the button, but know that most people are going to be hesitant to do so. I&#x27;m not sure if Apple would allow it, but if you could integrate the question to upgrade into your onboard slideshow, I&#x27;d bet you&#x27;d get higher conversion. The way it is, it&#x27;s pretty buried in there and this is the kind of app that people won&#x27;t upgrade until they have several days worth of data to see if it&#x27;s worth it. Chances are your app is going to tell them that they&#x27;re bad at losing weight. They&#x27;re going to be the most motivated and hopeful right when they downloaded it. Hope is a good place for conversion in my opinion.<p>Also, for the My Weight Goals, I didn&#x27;t understand why it defaulted to Track Using : Actual Weights. Isn&#x27;t the point to have it track using Moving Avg Weights? I just wasn&#x27;t sure why you defaulted to this.<p>Thanks for sharing!
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rooster8almost 10 years ago
Hi HN!<p>Happy Scale helps people who are losing weight to redefine their relationship with the scale. By using their daily weigh-in as a single data point in a moving average instead of a source of truth, you can see daily weight loss progress in the app even when your scale weight plateaus for a few days. Over time, you become desensitized to the horror of a bad weigh-in and can avoid discouragement during the tender moments of building your new lifestyle habits.<p>I created this iOS app because I would be devastated in the first few days of a diet when I hopped on the scale and saw a number that was higher than my starting weight. I went on to learn that there are many factors that can cause fluctuations of a few pounds in our weight from day to day (glycogen stores, water retention, food in the belly, etc.), and using a moving average is a convenient way to neutralize these factors.<p>I&#x27;ve been working on this as a nights and weekends project for a bit over 4 years. I have some big ideas for where I&#x27;d like to take it in the future, but I&#x27;d love to get your feedback on where it is today!
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yaddayaddaalmost 10 years ago
For Android users, I&#x27;ve been using Libra for several years now and enjoy that I can customize the moving average.<p><a href="http:&#x2F;&#x2F;www.appbrain.com&#x2F;app&#x2F;libra-weight-manager&#x2F;net.cachapa.libra" rel="nofollow">http:&#x2F;&#x2F;www.appbrain.com&#x2F;app&#x2F;libra-weight-manager&#x2F;net.cachapa...</a><p><a href="https:&#x2F;&#x2F;play.google.com&#x2F;store&#x2F;apps&#x2F;details?id=net.cachapa.libra" rel="nofollow">https:&#x2F;&#x2F;play.google.com&#x2F;store&#x2F;apps&#x2F;details?id=net.cachapa.li...</a>
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tlalmost 10 years ago
From my experience, using a moving average works really well to track weight. I am repeatedly amazed that more apps don&#x27;t have something like this considering Hacker&#x27;s Diet[1] was doing it over a decade ago.<p>[1] <a href="http:&#x2F;&#x2F;www.fourmilab.ch&#x2F;hackdiet&#x2F;online&#x2F;hdo.html" rel="nofollow">http:&#x2F;&#x2F;www.fourmilab.ch&#x2F;hackdiet&#x2F;online&#x2F;hdo.html</a>
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cmsjalmost 10 years ago
Very nice app! Thanks for putting decent HealthKit toggles in the app itself. I&#x27;m quite choosy about which apps can read HK data and which can write, and many of them are not good at making it obvious if they can cope with that!
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krrrhalmost 10 years ago
Looks like a nicer UI than the withings app. Any thoughts about adding bf%? My #1 feature request for an app like this would be to see trend lines for LBM kg and Total Fat kg on one chart.
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jasmcolealmost 10 years ago
What&#x27;s the &#x27;advanced math&#x27; used for the moving average? Some form of convolutional filter?
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