The best-known AI chat: it writes, summarizes, translates, creates images and searches the internet.
Who it's for: For everyone.
It also has free use with limits in the app, in addition to the paid plans. (Free with usage limits)
Go: ≈ €7/mo$8/mo
Plus: ≈ €18/mo$20/mo
Pro: from ≈ €89/mofrom $100/mo
Free plan: GPT-6 Luna and image creation with limits. Plus: GPT-6.1 Sol, GPT-6 Astra and GPT-6 Sol. The pricing page shows US$ (it doesn't publish a euro price for Spain).
Anthropic's assistant: very good at writing, analysing long documents and coding (includes Claude Code on paid plans).
Who it's for: For everyone; widely used for work.
It also has free use with limits in the app, in addition to the paid plans. (Free with usage limits)
Pro: ≈ €18/mo$20/mo(≈ €15$17/mo paid yearly)
Max: from ≈ €89/mofrom $100/mo
Free plan: Sonnet and Haiku with limits that reset every 5 hours. Pro: also Opus and Claude Code. Fable: paid plans only (with usage credits). Prices exclude taxes.
Google's assistant, integrated with Gmail, Docs and Android phones; it creates images and, with a paid plan, video.
Who it's for: For everyone, especially if you use Google.
It also has free use with limits in the app, in addition to the paid plans. (Free with usage limits)
Google AI Plus: €4.99/mo≈ $5.59/mo
Google AI Pro: €21.99/mo≈ $25/mo
Google AI Ultra: from €99.99/mofrom ≈ $112/mo
Official prices in euros (Spain page). Free: 3.5 Flash-Lite, image creation and editing, and limited access to Nano Banana Pro in Flow. Plus: 3.6 Flash, 3.1 Pro and video generation. Pro: 3.8 Flash.
Meta's assistant, inside WhatsApp, Instagram and Facebook and in its own app.
Who it's for: For people who want AI in the apps they already use.
Free with daily usage limits
Meta AI is free to use with a daily usage limit (app, web, WhatsApp, Instagram…). The paid Meta One plans are in limited testing and don't publish a price for Spain.
The most widely used interface design tool, with AI features to generate and edit designs.
Who it's for: Product designers and teams.
It also has free use with limits in the app, in addition to the paid plans. (Free with limits (Starter plan: 150 AI credits per day, up to 500 per month))
Check how much memory you have. What matters is the graphics card's memory (VRAM) or, on a Mac with an Apple chip, the unified memory. On Windows: Task Manager → Performance → GPU.
Install an app. The easiest is LM Studio (or Jan): you download it like any other program. Ollama is the option for people who use the terminal.
Look for the model inside the app (downloads them from Hugging Face) and pick a version that fits in your memory. «Q4» versions (4 bits) take up much less space and lose little quality.
Chat. Everything runs on your computer, without internet and without sending your data to anyone.
Your computer can't handle it? You can use the same model in the cloud through OpenRouter or other services, paying per use (then your data does leave your machine).
What fits on my computer?
Based on the minimum memory the models themselves publish (smallest compressed version).
Your graphics card's memory → the best models that fit (and the memory they need):
ChatGPT
