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Show HN: I built an app for comparing grocery prices across UK supermarkets

https://play.google.com/store/apps/details?id=com.wistfulcreations.GroceryCompare&hl=en_GB
1•poppet1208•1h ago
I'm a first year CS student at Sheffield and built this over the past year because I thought I could do better than Trolley.

Stack: React Native & Typesense for vector search and filtering. An ETL pipeline runs in the background handling scraping and automatic product categorisation using embeddings.

Covers Aldi, Tesco, Sainsbury's, Asda, Morrisons, Waitrose, Iceland, Ocado / M&S and Co-op. Clubcard and Nectar prices included. Sort by price per unit, filter by category and stores near you.

This was fun to make, and I have a lot planned, with some WIP:

- Basket Generation based on entering a shopping list and getting cheapest products for each store, and cheapest collection of stores for the cheapest total shop. Feels quite magical even in dev mode right now

- Local price estimates. Local stores differ from online prices by up to 20% depending on store fascia. I'm thinking to record a basket of goods for each local store and use it to estimate local prices

- Crowdsourced prices. Tricky one, due to running from a cold start. Would be very useful for certain stores without online prices, eg. Lidl.

That's all for now! Hopefully it'll help me get an internship even without traction ^_^

Show HN: CalcMonte – Monte Carlo simulation for loans and investments

https://calcmonte.com/
1•osepper•30s ago•0 comments

The Pendulum of Taste

https://constantinos.dev/blog/the-pendulum-of-taste/
1•a022311•35s ago•0 comments

Cuneiform

https://en.wikipedia.org/wiki/Cuneiform
1•tosh•2m ago•0 comments

U.S. Lawmakers Work on Unified Site-Blocking Bill to Counter Online Piracy

https://torrentfreak.com/u-s-lawmakers-work-on-unified-site-blocking-bill-to-counter-online-piracy/
1•t-3•2m ago•0 comments

I let an AI run my startup for 35 days – 315 sessions, $0 revenue

https://agentfounder.ai/blog
1•manduks•4m ago•0 comments

Reviving a Robot

https://allevato.me/2026/04/03/reviving-a-robot
1•kukanani•5m ago•0 comments

Sketch of the Analytical Engine Invented by Charles Babbage

https://www.fourmilab.ch/babbage/sketch.html
1•shrikaranhanda•6m ago•0 comments

Video from Artemis II flyby of the Moon will not initially look spectacular

https://arstechnica.com/space/2026/04/video-from-artemis-ii-flyby-of-the-moon-will-not-initially-...
1•dangle1•7m ago•0 comments

C# in Unity 2026: Features Most Developers Still Don't Use

https://darkounity.com/blog/c-in-unity-2026-features-most-developers-still-dont-use
1•hacker_13•9m ago•0 comments

New fibre optic data transmission speed record of 450Tbps

https://www.ucl.ac.uk/news/2026/apr/new-fibre-optic-data-transmission-speed-record
3•giuliomagnifico•17m ago•0 comments

Private Files on a Static, Open-Source Website

https://hnlyman.github.io/pages/private_files.html
1•hnlyman•17m ago•0 comments

Gas Town from Clown Show to v1.0

https://steve-yegge.medium.com/gas-town-from-clown-show-to-v1-0-c239d9a407ec
1•yodon•18m ago•0 comments

Microbial upcycling of plastic waste to levodopa

https://www.nature.com/articles/s41893-026-01785-z
1•PaulHoule•18m ago•0 comments

Show HN: Lumina – a statically typed web-native language for JavaScript and WASM

https://github.com/nyigoro/lumina-lang
1•light_ideas•19m ago•0 comments

Disclosing bluehammer exploit, vulnerability is still unpatched

https://deadeclipse666.blogspot.com/2026/04/public-disclosure.html
3•Alifatisk•20m ago•0 comments

I Tried Vibing an RSS Reader and My Dreams Did Not Come True

https://blog.jim-nielsen.com/2026/vibe-dreams-didnt-come-true/
3•herbertl•21m ago•0 comments

What Being Ripped Off Taught Me

https://belief.horse/notes/what-being-ripped-off-taught-me/
38•doctorhandshake•23m ago•7 comments

Token-Aware LLM Load Balancer route by inflight tokens,not connections

https://github.com/SivagurunathanV/token-aware-balancer
2•sivagurunathanv•23m ago•0 comments

A real-world case of property-based verification

https://ochagavia.nl/blog/a-real-world-case-of-property-based-verification/
1•wofo•24m ago•0 comments

Panther Lake is the real deal

https://world.hey.com/dhh/panther-lake-is-the-real-deal-4bd731f1
2•0xedb•24m ago•0 comments

Show HN: I built a 2-min quiz that shows you how bad you are at estimating

https://www.convexly.app/
3•convexly•26m ago•0 comments

Baidu Silent About Failure of 100 Robotaxis in Wuhan

https://www.forbes.com/sites/bradtempleton/2026/04/05/baidu-silent-about-failure-of-100-robotaxis...
1•mhb•27m ago•0 comments

When the Push Button Was New, People Were Freaked (2021)

https://daily.jstor.org/when-the-push-button-was-new-people-were-freaked/
1•thunderbong•29m ago•0 comments

Nanonets OCR-3: A multimodal OCR model with bounding boxes & confidence scores

https://nanonets.com/research/nanonets-ocr-3
1•vitaelabitur•29m ago•0 comments

Muon and MuonClip Optimizers

https://chizkidd.github.io//2026/04/04/muon-muonclip/
1•ibobev•29m ago•0 comments

Rational Matrix Iterations for Polar Decomposition

https://jiha-kim.github.io/posts/rational-polar-decomposition/
2•ibobev•30m ago•0 comments

» the Mystery of Rennes-Le-Château, Part 3: A Secret History

https://www.filfre.net/2026/04/the-mystery-of-rennes-le-chateau-part-3-a-secret-history/
1•ibobev•31m ago•0 comments

NameWheel – Free wheel spinner with no ads, no signup, no tracking

https://namewheel.org/
1•alshanty•34m ago•0 comments

Structural color can now be printed with an inkjet printer

https://www.kobe-u.ac.jp/en/news/article/20260406-67657/
3•geox•35m ago•0 comments

Show HN: Ec – terminal native 3-way Git mergetool

https://github.com/chojs23/ec
6•neozz•36m ago•0 comments