A cloud-based, agentic development environment designed to accelerate how you build, test, deploy and run production-quality AI applications, all in one place.
United States
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21st.dev AlternativesOnly apps categorised as AI Coding Assistants
The best AI Coding Assistant alternative to 21st.dev is Firebase Studio, which is free. If that doesn't suit you, our users have ranked more than 50 alternatives to 21st.dev and nine of them are AI Coding Assistants so hopefully you can find a suitable replacement. Other interesting AI Coding Assistant alternatives to 21st.dev are Replit, DeepSite, Qoder IDE and Nut Chat.
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21st.dev alternatives are mainly AI Coding Assistants, but if you're looking for Code Editors or IDEs you can filter on that. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to 21st.dev.
Alternatives list
- 78 Firebase Studio alternatives
109 Replit alternativesReplit is a collaborative cloud development environment offering in-browser IDE features like AI assistance, real-time collaboration, Git support, hosting, deployment, syntax highlighting, plugin extensibility, ad-free UI, dark mode, and live code sharing.
Cost / License
- Freemium
- Proprietary
Application types
Platforms
- Online
- Android
- iPhone
- Android Tablet
- iPad
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45 DeepSite alternativesDeepSite is a free app that lets you use DeepSeek for coding and preview your website directly in the browser with no experience at all.
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66 Qoder IDE alternativesQoder is an AI-powered agentic coding platform and IDE that automates complex software development tasks using autonomous AI agents.
74 Nut Chat alternativesOpen source tool centered on AI-driven full stack app development, Nut generates bug analysis via Replay.io recordings and runtime behavior capturing, offering AI developers explanations for effective resolutions. Early adopters enjoy free access for feedback contributions.
49 Rork alternativesGenerates production-ready, cross-platform mobile apps using AI that interprets written descriptions into app designs with React Native, needing no coding expertise. Suitable for businesses and individuals seeking fast digitization and mobile app development.
Cost / License
- Freemium
- Proprietary
Platforms
- Online
+2
Line0 is the first AI pair programmer designed and built specifically for backend developers. You can build a production-ready backend API services in minutes with just a few prompts.
Cost / License
- Freemium
- Proprietary
Platforms
- Online
+1
57 Atoms.dev alternativesAtoms is an AI-powered multi-agent platform that simulates a complete development team including product manager, architect, and engineer. It turns natural language prompts into real apps, websites, dashboards, games, and more.
Cost / License
- Freemium
- Proprietary
Application types
Platforms
- Online
- Software as a Service (SaaS)
+3
AI powered app creation at your fingertips. Create production-ready, highly polished apps instantly with no coding required.
Cost / License
- Freemium
- Proprietary
Platforms
- Online
+1
China
United Kingdom
