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  "markdown": "Co-founder, OpenWeather.\n\n## What Denn builds\n\n- [OpenWeather One Call API](https://www.anchorterminal.com/tools/openweather-one-call.md), graded C, 57.4/100, in Weather \u0026 climate data. Current weather, minute, hourly and daily forecasts, government alerts and history back to 1979 in one call, billed per call with 1,000 free a day. Co-founder, OpenWeather, researched 2026-10-28.\n\n## Works with\n\n- [Olga Ukolova](https://www.anchorterminal.com/people/olga-ukolova/), Co-founder, OpenWeather\n\n## Questions\n\n### Who is Denn Ukolov?\n\nDenn Ukolov is co-founder of OpenWeather.\n\n### What does OpenWeather make?\n\nAnchor Terminal lists OpenWeather One Call API from OpenWeather. Current weather, minute, hourly and daily forecasts, government alerts and history back to 1979 in one call, billed per call with 1,000 free a day.\n\n### How are Denn's tools graded?\n\nOpenWeather One Call API is graded C, 57.4 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.\n\n## Sources\n\n- https://openweathermap.org/\n- https://openweathermap.org/support-centre\n- https://en.wikipedia.org/wiki/OpenWeatherMap\n\nThese are the people building the tools we list, named for their public role in the company or project behind a listing, from public pages, with the date it was researched. They don't work for Anchor Terminal (our own team is on the about page, /about/#author). We show public roles, public profiles and what the listing pages show, nothing private. To correct something, send an about or a photo, or have a page removed, write to privacy@anchorterminal.com.\n",
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