AI app builders compared: Lovable, Base44, Replit and Bubble

The four tools in brief

| Tool | How you build | What the vendor says is included | Notable |
|---|---|---|---|
| Lovable | Chat in plain language, live preview | Hosting, authentication, payments, security scans | Publish directly from the editor |
| Base44 | Prompts (vibe coding) | Backend, storage, authentication, hosting, analytics | Payments via Wix Payments |
| Replit | Chat, plus Infinite Canvas for design | Wide range of project types: web, mobile, slides, games | Free mode without token costs |
| Bubble | AI agent plus visual editor | Visual database and workflows | Native mobile and code import |

All features in the table come from the vendors' own websites.

Lovable

According to Lovable, you describe what you want and the platform builds software from it, including hosting, authentication and payments. You see a live preview whilst building and can then publish directly. Transparency: AI Up to Date itself runs on Lovable. We have no commercial relationship with Lovable.

Base44

Base44 positions itself as "the entire stack without setup": backend and storage are built in. You can connect your own domain, view analytics and receive payments via Wix Payments.

Replit

Replit focuses on building via chat without programming knowledge, for many types of projects. Notable are the Free mode for brainstorming without token costs and the Infinite Canvas for visually adjusting designs.

Bubble

Bubble calls itself a no-code AI app builder for web and native mobile. You switch between the AI agent and a visual editor in which the backend is also visible. If you've already built an app with AI, according to Bubble you can import that code.

How to choose in five steps

1. Write down your app in five sentences: who uses it, and what must it do?
2. Determine whether you need native mobile. Bubble and Replit mention mobile explicitly.
3. Consider who does the maintenance. If you want to keep tinkering visually yourself, then Bubble fits. If you're mainly chatting, then Lovable, Base44 or Replit.
4. Build the same small prototype in two tools and compare the result.
5. Check prices and data location on the current pricing pages and in the processor agreements.

Limitations to watch out for

• None of the homepages mention complete prices; these change frequently.
• Generated apps remain your responsibility for security and GDPR.
• Claims about speed or "production-ready" are claims from the vendors, not from our editorial team.

Frequently asked questions

Which AI app builder is the best?
That depends on your goal. We're not pointing to a winner, because we haven't done our own tests.

Do I need programming knowledge?
According to the vendors, not to get started. For complex apps, technical knowledge does help.

Can I move my app later?
That differs per tool. Check in advance whether you can export code or data.

See also: Comparing AI automation and the AI tools directory.