15:[[44670146,{"by":"misha599","descendants":2,"id":44670146,"kids":[44671218],"score":7,"text":"At its core, the $350B resale industry is a messy, unstructured data problem.

Resale isn’t a single market — it’s an extremely fragmented ecosystem of global marketplaces (The RealReal, Poshmark, Etsy, eBay, Fashionphile, etc.) and a long tail of independent resellers, social media merchants, and vintage/consignment shops.

On both the consumer and enterprise sides, the biggest pain points stem from a lack of unified product schemas and inconsistent condition nomenclature and evaluation standards.

We’re building SECONDSENSE to be the operating system for luxury resale, and we just launched our new UI to empower shoppers with data to find the best deals & investment pieces.

Would love feedback from anyone who’s worked on marketplace data, product search, or catalog infrastructure.","time":1753362127,"title":"Show HN: SECONDSENSE – The OS for the Resale Economy","type":"story","url":"https://secondsense.co:443/"}],[44604416,{"by":"simplekindofman","descendants":3,"id":44604416,"kids":[44604548,44605264,44604475,44604620,44612667],"score":4,"time":1752845204,"title":"Show HN: Child Affordability Index","type":"story","url":"https://childaffordabilityindex.com/"}],[44592779,{"by":"ryry","descendants":8,"id":44592779,"kids":[44592960,44596230,44593268],"score":8,"text":"Hey HN! I wanted to know what was going on in cities/towns where my friends live, so I built Needle.

It uses an LLM + Open Street map to best estimate general locations of stories posted in the past day, and pin them on the map. For stories involving multiple places, I also wanted to show the relation between them.

It's still a little janky, and is limited to mostly Canadian sources of news at the moment, but I'm planning on expanding it shortly, as I'm keen to see what international sources are writing about my home city.

Let me know if you have any questions/feedback!","time":1752756568,"title":"Show HN: Needle – An Explorable Map of the News","type":"story","url":"https://needle.news"}],[44581126,{"by":"stagas","descendants":7,"id":44581126,"kids":[44581184,44582695,44581334,44589863],"score":4,"time":1752666307,"title":"Show HN: Infinite Canvas for Notes","type":"story","url":"https://infinote.surge.sh/"}],[44571192,{"by":"fredthedeve","descendants":3,"id":44571192,"kids":[44577659,44571378],"score":4,"text":"Are your RAG models hallucinating? Maybe the issue isn't the LLM, but the retrieval phase.

I built RAGsplain (ragsplain.com) to help debug this. You upload documents (PDFs, audio, YouTube links), choose a retrieval method (semantic, keyword, or hybrid), and see the exact chunks of context passed to the model — match scores included.

Turns out: when retrieval is bad, even the best model can’t think straight.

It’s open and free to use. Would love feedback from folks building RAG pipelines.","time":1752587570,"title":"Show HN: RAGsplain – What does your RAG model see before it answers?","type":"story","url":"https://www.ragsplain.com/"}],[44490588,{"by":"HeavenFox","descendants":32,"id":44490588,"kids":[44498622,44494156,44537676,44494739,44495848,44490935,44493937,44495709,44497479,44498389,44494843,44501167,44499298,44491839],"score":201,"text":"Hello HN!

As a long term NYC resident, I have read countless articles on ideas tweaking subway services, but always found them hard to follow without visual aid. So over the long weekend I decided to build one. It has all the basic features: trains would spawn at their origin, stop at stations, and slow down if it gets too close to another. You can also design custom routes by piecing tracks together.

Have fun, and let me know what you think!","time":1751897636,"title":"Show HN: NYC Subway Simulator and Route Designer","type":"story","url":"https://buildmytransit.nyc"}],[44453377,{"by":"WilcoKruijer","descendants":2,"id":44453377,"kids":[44537634,44469459],"score":29,"text":"$16","time":1751536452,"title":"Show HN: Recivo – Receive Emails Programmatically","type":"story","url":"https://recivo.email/"}],[44522683,{"by":"friggeri","descendants":495,"id":44522683,"kids":[44555594,44557872,44561009,44556490,44557158,44557081,44557454,44526638,44555914,44542392,44555315,44555725,44560456,44557128,44557529,44555414,44564159,44556580,44558205,44558511,44557262,44556122,44556399,44561177,44561528,44556332,44556672,44556853,44556253,44527744,44557200,44559833,44557656,44558120,44562645,44572166,44563418,44557133,44557389,44568019,44557591,44556007,44573139,44555731,44559979,44523558,44557427,44556545,44566285,44555298,44557150,44560095,44585523,44524760,44558010,44555274,44556360,44558021,44559051,44556972,44555722,44562330,44557409,44561385,44555226,44557205,44556263,44556687,44558958,44555946,44561927,44557254,44563360,44569625,44557423,44537602,44537621,44531768,44563339,44556096,44557674,44550147,44555764,44557290,44563209,44562038,44555884,44557149,44567116,44556957,44555889,44559638,44563355,44562603,44563076,44561012,44557233,44556506,44563336,44556445,44556947,44559563,44621618,44621617,44555923,44556416,44556703,44561090],"score":958,"text":"$17","time":1752164473,"title":"Show HN: Ten years of running every day, visualized","type":"story","url":"https://nodaysoff.run"}]]

user:	chrisxlucas
created:	July 11, 2025
karma:	1