Compared on five facts
AI flow builders that work without your own API key
No API key means the builder includes the models, so you never create a provider account or paste a key. This page compares nine builders on five facts, with a note on each mark, including the ones LetBe.ai does not win.
Free to start. No card needed.
What no API key actually means
Three different things get called no API key. The tool includes model usage in its own price. The tool gives you a small free allowance and then asks for your key. Or the tool never needs a key because it runs a model on your own machine.
Only the first is truly key-free at scale. The table marks the difference.
Nine builders, five facts
Hosted means the vendor runs it. Models built in means you never open a provider account. Free to start means you can build and publish before paying. Marks come from each vendor's own site.
| Platform | Hosted | Models built in | No API key | Free to start, no card | Visual flow |
|---|---|---|---|---|---|
| LetBe.ai | Yes | Yes | Yes | Yes, no timer | Yes |
| Gumloop | Yes | Yes | Yes | Trial only | Yes |
| n8n | Cloud or self-host | No, bring your keys | No | Self-host only | Yes |
| AI by Zapier | Yes | Yes | Yes | Yes, capped | Steps, not a canvas |
| Relevance AI | Yes | Yes | Yes | Yes, capped | Yes |
| Pickaxe | Yes | Yes | Yes | No | Partly |
| MindStudio | Yes | Yes, widest choice | Yes | Yes, one agent | Yes |
| Lindy | Yes | Yes | Yes | Trial | Steps |
| Dify Cloud | Yes | Allowance first, then your own key | Only until the allowance runs out | Yes, capped | Yes |
Where LetBe.ai loses
- Integrations: n8n and Zapier connect to far more apps.
- Model choice: MindStudio lets you pick among more models.
- Team governance: Gumloop and Relevance AI have stronger admin controls.
- Self-hosting: LetBe.ai does not offer it at all.
Where LetBe.ai wins
Free to start with no card and no timer, models built in, hosted execution, test in chat while building, publish as a live address plus a shareable chat page, prepaid usage with no subscription. The hosted AI agent builder page and the AI flow builder page go into each of those; the eight-builder comparison asks six other questions.
No API key questions
Which builders never ask for an API key?
The ones with models built in and included in their own pricing: LetBe.ai, Gumloop, AI by Zapier, Relevance AI, Pickaxe, MindStudio and Lindy. n8n needs your keys, and Dify Cloud asks for one once its allowance is used.
Is free to start the same as a free plan?
No. Free to start means you can build and publish before paying. Some tools then cap usage, some start a timer. LetBe.ai gives free credits with no card and no timer, then a prepaid wallet.
Which one should a non-developer pick?
One with a visual canvas, hosted execution and built-in models. Try two from the table; the shortlist is short.
When is self-hosting the right answer?
When execution must stay inside your own network. Then n8n is the tool, and you bring the keys.
Free to start. No card, no key. Pricing