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Open-source mobile app builder — create iOS, Android, and web apps without coding. White-label support for agencies. Self-registration portal for selling apps. Large and growing user base. Free Single App Edition. Multi-Apps hosted: ~$79/month. Self-hosted one-time options available.
Practical for agencies building simple mobile apps for multiple clients under their own brand. Free tier is generous. Apps may not match the polish of modern no-code alternatives.