Free AI APIs for Ideas - 6 Free AI tools

Preuve AI - AI Startup Business Idea Validator 2.0

Find out if your idea is worth building. Instantly.

Startup idea validation

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31,820 preuve.ai

Julio

🙏 3 karma

Jan 25, 2026

@Preuve AI - AI Startup Business Idea Validator

So I tested out Test Your Idea, and it actually works pretty well. You put in your idea, wait a minute, and it shows you the stuff you've been missing. Got some decent pivot suggestions that helped me refocus from a tiny niche to something way bigger. Saved me from probably wasting a few months in the wrong direction if you're actually gonna build something, not just daydreaming about it

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Released 3mo ago

Free + from $29

34,667

44

5.0

Impectly

Find profitable startup ideas backed by real revenue data.

Startup idea validation

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Released 2mo ago

Free + from $19/mo

560

9

5.0

HappySeeds 1.1.2

Turn ideas into AI-powered apps instantly.

Apps

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12,651 happyseeds.ai

HappySeeds

🛠️ 1 tool

- New: A big batch of templates — more scenes and use cases, ready to use out of the box - Spotlight this release: 3D Planet — an interactive globe template built entirely no-code on HappySeeds, fully rotatable and zoomable for exploring global ecosystems - The template includes a built-in Endangered Animals Guide: tap markers on the globe to see habitats and fun facts about endangered animals - The template features hand-drawn icons and clean info cards, making the content more engaging and easy to digest - Works everywhere — smooth on both desktop and mobile, great for classrooms, science outreach, or personal exploration Built by a community creator on HappySeeds — shared here as a real example of what the platform can do.

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🇭🇰 Hong Kong

Released 2d ago

Free + from $19.90/mo

14,741

42

5.0

PromptFix v1.2

AI Prompt Optimizer & Analyzer

Prompts

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8,118 www.promptfix.online

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Released 3mo ago

Free + from $9/mo

9,833

57

4.6

LigoSocial v2.0

Get authentic LinkedIn posts, comments and advanced analytics.

Linkedin engagement

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82,582 ligo.ertiqah.com

Junaid Khalid

🛠️ 2 tools 🙏 100 karma

Mar 25, 2025

@LigoSocial

Note from the Founder: Try the web app before you try its chrome extension. It's very powerful - I use it for my own linkedin posts, comments

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🇺🇸 United States

Released 11mo ago

Free + from $29/mo

90,831

214

4.8

Whiteboard by Athena AI v1.1.4

Visualize your ideas and share with your team

Brainstorming

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102,846 athenaboard.ai

hamed elghoul

🙏 52 karma

Mar 19, 2025

@Whiteboard by Athena AI

Whiteboard by Athena AI is a user-friendly, AI-powered tool that makes digital collaboration seamless. supports real-time brainstorming, and integrates easily with other apps—ideal for teams, educators, and remote learners alike.

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Released 1y ago

Free + from $5.99/mo

111,031

186

4.6