Best free Boltz alternatives

✦ WhyA Boltz alternative — Free browser-based access to AlphaFold 3-class structure prediction for non-commercial research.

• Free browser-based access to AlphaFold 3-class structure prediction for non-commercial research
• Predicts structure/interactions of proteins, DNA, RNA, ligands in one model
• Backed by the AlphaFold Protein Structure Database of 200M+ predicted structures

✦ WhyA Boltz alternative — General-purpose biomedical agent combining LLM planning with code execution.

• General-purpose biomedical agent combining LLM planning with code execution
• Integrates 150+ bioinformatics tools and 59 databases
• Web interface so biologists can use it without coding
• Open-source from Stanford SNAP lab

✦ WhyA Boltz alternative — Chai-1 is free, Apache-2.0-licensed for academic and commercial use — a genuinely open structure-prediction model.

• Chai-1 is free, Apache-2.0-licensed for academic and commercial use — a genuinely open structure-prediction model
• Chai-2 (paid, enterprise) generates de novo antibodies directly from target epitopes, used by Lilly, Novartis, Pfizer

✦ WhyA Boltz alternative — Autonomous AI agent that runs literature review + data analysis cycles, condensing ~6 months of research into a day per vendor.

• Autonomous AI agent that runs literature review + data analysis cycles, condensing ~6 months of research into a day per vendor
• Publicly available via web interface and API, not an internal-only research demo
• Kosmos itself requires a paid subscription; the free plan covers only standard agents.

✦ WhyA Boltz alternative — DNA language model at single-nucleotide resolution with 1M base-pair context.

• DNA language model at single-nucleotide resolution with 1M base-pair context
• Variant effect prediction, sequence completion and genome design
• Free hosted 40B access via NVIDIA build.nvidia.com
• Apache 2.0 code, weights and training data open; published in Nature

✦ WhyA Boltz alternative — Agentic tree search proposes ideas, runs experiments and writes papers.

• Agentic tree search proposes ideas, runs experiments and writes papers
• No human-authored templates needed
• Open code from Sakana AI
• Requires disclosure of AI use in resulting papers

✦ WhyA Boltz alternative — Free, no credit card required.

• Free, no credit card required
• Open-source (git.new/scira)
• Multi-mode search: web, Reddit, academic papers, video, fact-check

✦ WhyA Boltz alternative — Open-source, Apache 2.0, self-hostable generative-UI search engine.

• Open-source, Apache 2.0, self-hostable generative-UI search engine
• 9k+ GitHub stars, actively maintained
• Pluggable model (OpenAI/Anthropic/Gemini/Ollama) and search backends (Tavily/Brave/Exa)

✦ WhyA Boltz alternative — Ad-free AI search with direct answers.

• Ad-free AI search with direct answers
• Built-in slide presentation and video generation
• File upload and API access
• Free to use