# Denn Ukolov (slim)

> Denn Ukolov is co-founder of OpenWeather. OpenWeather One Call API on Anchor Terminal, with grades, an about and public profiles.

- Full: https://www.anchorterminal.com/people/denn-ukolov/index.md (~550 tokens) · this version ~380 tokens · JSON https://www.anchorterminal.com/people/denn-ukolov/index.json · canonical https://www.anchorterminal.com/people/denn-ukolov/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-28
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Co-founder, OpenWeather.

## What Denn builds

- [OpenWeather One Call API](https://www.anchorterminal.com/tools/openweather-one-call.md), graded C, 57.4/100, in Weather & 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.

## Works with

- [Olga Ukolova](https://www.anchorterminal.com/people/olga-ukolova/), Co-founder, OpenWeather

## Questions

### Who is Denn Ukolov?

Denn Ukolov is co-founder of OpenWeather.

### What does OpenWeather make?

Anchor Terminal lists OpenWeather One Call API from OpenWeather.

### How are Denn's tools graded?

OpenWeather One Call API is graded C, 57.4 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.

## Sources

- https://openweathermap.org/
- https://openweathermap.org/support-centre
- https://en.wikipedia.org/wiki/OpenWeatherMap

These 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.