Duck.ai – includes GPT, Claude, Image generator, PDF analysis, and 100 chats No subscription

With the free version, you can: Chat with a range of AI models, including GPT-5.4 mini, GPT-5.4 nano, Claude 4.5 Haiku, Mistral Small 4, gpt-oss-120b, and Gemma 4 31B. Write, improve, translate, and summarise text. Ask questions, learn, brainstorm, and get help with programming. Analyse PDFs of up to 15 pages and work with images. Create and edit images using text prompts. Use voice chat, where available. Save up to 100 chats and pin up to 5 chats. Sync your chats across multiple devices.
Which model should you use
For more demanding tasks, try GPT-5.4 mini. For polished writing, Claude 4.5 Haiku is a good option. For quick and simple questions, GPT-5.4 nano or Mistral Small 4 should be sufficient.
Daily usage limits apply, and more complex tasks, reasoning, and image processing may use your allowance faster. Even so, the free plan gives you access to a wide selection of capable AI models and useful features. A subscription is not required.