{"slug": "a-vibe-coded-alternative-to-yieldgimp", "title": "A vibe-coded alternative to YieldGimp", "summary": "A developer created a free, open-source web tool at mazzo.li/gilts/ as an alternative to YieldGimp for evaluating UK gilts, after YieldGimp became an app. The tool, built with an LLM in minutes, requires users to input a price rather than using market price, and allows selecting a tax rate for gross equivalent yield. The source code is on GitHub.", "body_md": "If you’re a UK tax resident, short-term low-coupon gilts are the most tax efficient way to get savings-account-like returns, since most of their yield is tax free. This makes them very popular amongst retail investors, which now [hold a large portion](https://archive.is/cEUtf) of the tradable low-coupon gilts.\n\n[YieldGimp.com](http://YieldGimp.com) used to be a great free resource to evaluate the gilts currently available. However, it was recently turned into an app rather than a simple webpage. I’m not even sure if the app is free or paid, but I do not want to install the “YieldGimp platform” to quickly check gilt metrics when I buy them.\n\nSo I asked my LLM of choice to produce an alternative, and after a few minutes and a few rounds of prompting I had something that served my needs. It is available for use at [mazzo.li/gilts/](https://mazzo.li/gilts/), and the source is [on GitHub](https://github.com/bitonic/gilts-app).\n\nIt differs from YieldGimp in that it does not show metrics based on the current market price, but rather requires the user to input a price. I find this more useful anyway, since gilts are somewhat illiquid on my broker, so I need to come up with a limit price myself, which means that I want to know what the yield is at my price rather than the market price. It also lets you select a specific tax rate to produce a “gross equivalent” yield.\n\nIt is not a very sophisticated tool and it doesn’t pretend to model gilts and their tax implications precisely (the repository’s [README](https://github.com/bitonic/gilts-app/blob/master/README.md#yield-model-used) has more details on its shortcomings), but for most use cases it should be informative enough to sanity-check your trades without a Bloomberg terminal.", "url": "https://wpnews.pro/news/a-vibe-coded-alternative-to-yieldgimp", "canonical_source": "https://mazzo.li/posts/vibe-coded-gilts.html", "published_at": "2026-07-20 16:45:23+00:00", "updated_at": "2026-07-20 16:55:50.586895+00:00", "lang": "en", "topics": ["developer-tools"], "entities": ["YieldGimp", "GitHub"], "alternates": {"html": "https://wpnews.pro/news/a-vibe-coded-alternative-to-yieldgimp", "markdown": "https://wpnews.pro/news/a-vibe-coded-alternative-to-yieldgimp.md", "text": "https://wpnews.pro/news/a-vibe-coded-alternative-to-yieldgimp.txt", "jsonld": "https://wpnews.pro/news/a-vibe-coded-alternative-to-yieldgimp.jsonld"}}