ChatGPT and general LLMs
General LLMs like ChatGPT are the most flexible idea generators: describe a market, a skill, or a trend and they will brainstorm dozens of directions, business models, and angles. They are free or cheap and genuinely useful for breaking a blank-page block. The limit is that they are generating from patterns in text, not from live market data, so the ideas can sound credible while having no real demand behind them. Use them to widen your options, not to pick a winner.
Dedicated AI idea-generator tools
A growing set of dedicated tools are positioned specifically as startup or business idea generators, often packaging an LLM with curated prompts, trend lists, or niche filters. They can be more focused and faster than a blank chatbot, and some surface interesting niches you would not have thought of. The honest caveat is the same one: most generate ideas without proving demand, and a polished idea card is still just an idea. Judge them on whether they help you think wider, not on whether the output is validated.
Why pure idea generation is low value on its own
The uncomfortable truth is that ideas are cheap and abundant; execution and demand are not. A generator that hands you a hundred ideas has not reduced your risk at all, because the failure point for most startups is building something nobody wants. Without checking real search volume, community complaints, and existing competitors, a generated idea is a guess with nice formatting. That is why generation and validation are different jobs, and why the second one is where you should spend your effort.
Olune: validation, not generation
Olune does not generate ideas, and that is the point. You bring an idea, from a generator, a shower thought, or a customer complaint, and Olune tells you whether to build it or kill it, in about 8 minutes, using live Reddit and community signals, a competitor map, real keyword search volume, and a 7-dimension scorecard. It is deliberately skeptical and will tell you to drop an idea when the evidence is thin, which is exactly what a generator never will. Use an AI generator to fill the funnel, then run the survivors through Olune (free tier is roughly 3 validations a day) to find the one worth your time.