DeepSeek
deepseek.com
Open-weight reasoning model you can use free in a chat window
Free account
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aistudio.google.com
Prompt playground with model, temperature and system-prompt controls.
The developer-facing side of Gemini: choose a model, write the system instruction, drag temperature and token limits, and watch how the output changes. It will hand you the equivalent curl or Python snippet and an API key in two clicks, which makes it the shortest path from an idea to working code. It is a workbench rather than an assistant — there is no chat sidebar to live in, and free-tier prompts may be used to improve Google's models.
Questions
Free to use, but you have to register before it will do the job. Free-tier requests are rate-limited per minute and per day, and free-tier prompts are not private.
Yes. Google AI Studio sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
Free-tier requests are rate-limited per minute and per day, and free-tier prompts are not private.
Alternatives
Same category or same task, ordered by how closely they overlap.
deepseek.com
Open-weight reasoning model you can use free in a chat window
huggingface.co
Thousands of runnable AI demos, no model installed on your machine
notebooklm.google.com
Summarises only the sources you upload, and cites the exact passage
arena.ai
Put one prompt to two anonymous models and vote for the better answer
chatgpt.com
The general assistant most people mean when they say they used AI
claude.ai
Anthropic's assistant, strongest on long documents and careful writing