DeepSeek

DeepSeek offers a free chat app on web, iOS and Android powered by its own models, which became famous in early 2025 for strong reasoning at low cost. Its models are also released with open weights for developers. It is a general helper for writing, learning, planning and answering everyday questions. Pricing at a glance: Chat app free; API is pay-per-use. As of October 2026, DeepSeek is actively developed and available. Before paying, test the free tier or trial with your own real tasks, check usage limits and commercial-use terms, and compare it with alternatives such as ChatGPT, Qwen Chat, Mistral Le Chat. Prices change often, so confirm the current plan on the official pricing page. Lesson for users: always keep your own copies of important data when you rely on any AI service, because products can change owners or close with little notice.