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lukko

829 karma · joined September 14, 2020

lungy.app
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lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
Yep - it's now fully optional, I think probably just delete the old version and go through onboarding again (and select No Mic Access). You'll then get a sort of simulated breathing response, rather than the actual input.
lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
Hahaha - we are adding in HRV & heart rate tracking - then I think we can officially call it 'biofeedback' :)
lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
Cool, thanks - its had quite a few updates since then. Will be interested to hear what you think.
lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
In general, Lungy is more an active form of meditation, so rather than closing your eyes and listening to guided instructions or following a timer, it relies on the combination of real-time feedback (showing your breathing with interactive visuals) and the physiological effects of changing your breath pattern for relaxation. So, you focus on what is going on in the moment, as a form of mindfulness.

It's less 'cognitive' than other apps, but a few studies have shown breathing exercises are as effective for stress as guided meditation, but also much simpler to follow [0]. I'm always slightly surprised at how effective breathing is in helping relaxation - although it obviously makes a lot of physiological sense. So, Lungy is designed to make a practice simple / fun to do each day.

[0] https://med.stanford.edu/news/insights/2023/02/cyclic-sighin...

lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
Ah was it based on SpiroSmart at all? It's a smartphone tech Google purchased in around 2017 [0].

Yep, it has been tricky to get over the line as a medical device and used in the NHS, hence the focus more on wellness initially.

[0] https://www.healthcareitnews.com/news/alphabet-acquires-seno...

lukko··on Ask HN: Who wants to be hired? (June 2025)
London, UK Remote: Yes Willing to relocate: No Technologies: Swift, Metal, Figma, UI/UX, Houdini, Real-time graphics & audio CV: lukehale.com; https://uk.linkedin.com/in/ukehale

Multi-disciplinary doctor and design engineer - created Lungy (lungy.app). Would love to help on interesting projects part-time (10-20 hours per week)

email: hello [at] lungy [dot] app

lukko··on Ask HN: What are you working on? (March 2025)
Are you able to access last year's: https://howtogrowalmostanything.notion.site/

Otherwise, look out in Jan / Feb next year for applications to be a 'committed listener'.

lukko··on Ask HN: What are you working on? (March 2025)
Working part-time on Lungy, the breathing app I developed whilst working as a doctor during COVID - https://www.lungy.app/

Also, very interested in synthetic biology atm, I’m taking HTGAA - https://www.media.mit.edu/courses/htgaa/

lukko··on Show HN: The App I Built to Help Manage My Diabetes
Thanks for the link. Yep - exactly, they took a leap, but importantly didn't release a full product / package on the App Store, or charge for features. This falls much more into a grey area, but is clearly DIY, and demonstrates demand/need for the commercial / regulated systems.

Especially when the problematic features are charged for, it gives the recommendations / suggestions an air of legitimacy which could be dangerous.

lukko··on Show HN: The App I Built to Help Manage My Diabetes
Hey, I'm a doctor and work in a similar area. I really like the name and well done on shipping. You can tell the app is made by a patient who suffers from the condition, which is amazing.

I would be really careful in this area though, especially using ChatGPT to generate suggestions. This to me this does venture into medical device territory, based on the intended use. Check the guidelines here https://www.gov.uk/government/publications/medical-devices-s... - UK specific, but will be similar for FDA.

Honestly, I would seek proper consultancy advice, remove any suggestions / recommendations for now, and just have it as a data-logging platform. The disclaimer unfortunately will not stand up.

Congratulations on getting this far - I really hope you continue on this path, just make sure you are on firm ground.

lukko··on FFT-based ocean-wave rendering, implemented in Godot
I think make the move gradually - find the stuff you were excited in originally, that you would love to learn more about and eventually do. Spend maybe a few hours a week diving into it - then gradually increase and move away from your current job.

Go for it - we're all rooting for you!

lukko··on FFT-based ocean-wave rendering, implemented in Godot
ah amazing, thanks - looks like 330k vertices
lukko··on FFT-based ocean-wave rendering, implemented in Godot
Oh my - this is great!

Does it mention what the density of the mesh is, or is it a flat plane with no displacement?

Also, I wonder if there's a way to optimise the foam particles in some way. It does seem very wasteful to generate them across the whole plane, when most are culled. I wonder if the particle emission / creation could be linked to foam density?

lukko··on Show HN: If YouTube had actual channels
I love this! Criterion Channel has a similar sort of function - a single, continuous channel (called 24/7) that plays curated movies from their collection. Did you curate the list of channels / videos?

Also, how is the noise generated? I know it's a tiny thing but it looks a bit repetitive / pseudorandom.

lukko··on Show HN: Hanon Pro – piano technique and exercises for the digital age
thank you!
lukko··on Show HN: Hanon Pro – piano technique and exercises for the digital age
This is great. Can you please add Czerny?
lukko··on Creativity fundamentally comes from memorization?
Huh, muscle memory implies motor programs that are subconscious and stored in the cerebellum - this is very different to creativity. It may enable you to make something new, but that is not a prerequisite. The value of spaghetti drawings is subjective, and actually to be able to make such disinhibited drawings with similar qualities as an adult is very difficult and requires unlearning. Picasso knew this very well.

The safe and very systematic approaches the author describes are defensive, too rigid and avoid what creativity really is - a leap into the unknown.

lukko··on Creativity fundamentally comes from memorization?
Wow, what a load of rubbish. I hate this kind of reductive, formulaic view of creativity. I think true creativity expands what is possible – so some kind of awareness of the current state of things is important, but rote memorisation has no real part in it.

The idea that memorisation leads to creativity is actually very misleading - especially the assumption that what you are learning is 'true'. It just means you are more aware of the restrictions and existing work in a field - often the most exciting work comes from the excitement and slight naivety of exploring something new - 'beginner's mind'. Kids are very creative, partly because their model of the world is not fully established.

lukko··on Self-Awareness Might Not Have Evolved to Benefit the Self After All
Hmm this seems very confused, and it's arguable whether more consciousness / self awareness has any net benefit for social cohesion.

It's very useful from an evolutionary standpoint to have an accurate internal model 'me', which you can project into hypothetical scenarios and learn from them, reducing risk and the amount of trial and error (and so increasing survival). I like the Hofstadter view that consciousness arises from the 'strange loopiness' of this self-awareness of the 'I' model.

Any social benefits are secondary, rather than the driving force, and are a result of this model and differentiating 'me' from 'you'.

lukko··on Atkinson Dithering (2021)
Thanks for sharing this.

I once used Floyd-Steinberg dithering to make 3D voxel prints from brain MRI scans [0]. You just convert the scan to full white and black values to represent different inks, and it means you don't have to do any segmentation and can represent fine structures much more accurately.

May be interesting to try with Atkinson dithering too, although the loss of detail may be an issue.

[0] https://www.lukehale.com/voxelprinting/

lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
Usually, a longer exhale is more relaxing - look up rectangle breathing. Also worth having a go at 'cyclic sighing'.
lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
Thanks - that is good to know. I realised after launching that some people pronounce it Lunge-y (rhyming with grunge), which wasn't my intention.

Maybe at some point we'll rename...

lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
Let's be clear - this is not a medical device and is not presented or marketed as such. Software / apps definitely can be medical devices (SaMD) and if it was used in someone with impaired lung function for whatever reason, or replicated the functionality of incentive spirometers then it would be regulated as such. The medical device version of the app will be a separate app, initially for asthma and COPD, and will have other features specific to these conditions. There is lots of functionality that can be added - compliance, medication tracking, physical activity, educational modules that you don't get with a 10$ spirometer. This health version will be a Class I medical device and we will publish the results of any trials with peer review.

Lungy is currently an app for people with healthy lungs - breathing exercises and mindfulness are effective at reducing anxiety and stress symptoms.

lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
Yes! Thank you. I feel like some companies can slip into medical device territory to avoid all the hassle..

Honestly the regulatory process I have found to be incredibly opaque and difficult. It's tricky to find out what exactly qualifies as a medical device, and then the process for certification. A company called Open Regulatory helped us and the flow chart here is helpful (for UK):

https://www.gov.uk/government/publications/software-and-arti...

lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
Thanks so much. Yes a blog or newsletter is a good idea..

We have some results for improved ML breath detection which could be quantitative (real-world values for flow & volume). I want it to go through peer review ideally and then would try to publicise the results.

lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
Ok thanks, that's good to know. I guess porting the shader code wouldn't be too bad..
lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
I think you mentioned the main ones, awareness of breathing rate / depth and relaxing your abdominal muscles / diaphragm to breathe deeply. Interesting side note - the innervation for the diaphragm comes from the neck, so if you are aware of sensation of it, it's experienced in the shoulder region.

Breathing depth and rate is so closely linked to physiological stress. Breathing exercises are such a simple intervention to break this cycle but they do work surprisingly well.

lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
yep - I'm happy with the UI now. My main reservation is trying to get it to run smoothly across all Android hardware - there's obviously much more variation than iOS.
lukko··on Show HN: I'm a doctor and built a responsive breathing app for anxiety and sleep
Yes definitely. Potentially it could be diagnostic too - the periods of apnoea would probably have a unique audio and accelerometer signal.

OSA is typically diagnosed now with polysomnographs, which have a lot of wires and sensors and are quite uncomfortable to sleep with. I think there are a few startups in this space, making much more lightweight and comfortable hardware. It may be interesting to just use a phone though..

lukko··on Show HN: I built an interactive cloth solver for Apple Vision Pro
I've just made a ShowHN for Lungy here, it has some more details: https://news.ycombinator.com/item?id=40553986
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