5 Best Open Source Fastgen Alternatives
A curated collection of the 5 best open source and self-hosted alternatives to Fastgen in 2026.
Looking for a free, privacy-friendly, or self-hosted replacement for Fastgen in 2026? The top open-source alternative is ToolJet — Build enterprise apps with AI-powered low-code.
Other highly rated open-source Fastgen alternatives include Budibase, Trigger and Hatchet.
Build enterprise apps with AI-powered low-code
ToolJet is an AI-native low-code platform designed to help teams build secure, scalable internal tools, workflows, and AI agents in minutes rather than months. The platform combines drag-and-drop app building with enterprise-grade features, making it ideal for developers, IT leaders, and AI managers who need to rapidly deploy internal applications. - AI App Builder: Create stunning front-end interfaces without dedicated engineers using AI-powered design assistance. - Workflow Automation: Enterprise-grade workflow orchestration with reliability and scale for complex business processes. - ToolJet Database: Scalable in-built no-code database built on PostgreSQL for seamless data management. - Agent Builder: Automate manual business processes with AI agents, reducing engineering effort. - Integrations: Connect data from diverse sources with seamless API and third-party integrations. - Built-in Security: Enterprise-grade security features including SOC2, GDPR, and ISO compliance. - Authentication & Authorization: Control user permissions and access levels across applications with granular controls. - Development Lifecycle: Manage app development from concept to deployment with integrated tools. ToolJet is open-source and can be self-hosted on your own infrastructure. The platform supports deployment on Kubernetes, Docker, and cloud providers. It is built with Node.js, React, and PostgreSQL, making it highly customizable and extensible. Comprehensive documentation and community support are available for self-hosting configurations.
Low-code platform for internal tools and AI agents
Budibase is a low-code platform designed to help businesses build internal tools, automate workflows, and deploy AI agents quickly. It connects to databases, APIs, and business systems, enabling teams to streamline operations without extensive coding. - AI Agents: Deploy AI-powered assistants to handle employee queries and automate tasks across multiple channels. - Internal Apps: Create custom internal tools for teams to manage processes, track work, and improve productivity. - Automations: Automate approvals, routing, notifications, and operational workflows with minimal setup. - Data Integration: Connect to databases, spreadsheets, and business systems like Salesforce, GitHub, and Notion. - API Explorer: Build, test, and manage APIs directly within the platform. - Enterprise-Grade Security: Features like audit logs, role-based access control, and compliance with industry standards. - Self-Hosting: Deploy on-premises or in your preferred cloud environment for full data control. - Collaboration Tools: Share apps, automate workflows, and collaborate across teams with built-in tools. Budibase supports self-hosting on various platforms, including Docker, Kubernetes, and cloud providers. It is built with Node.js and offers flexibility for deployment in environments that prioritize data privacy and security. The platform is designed to be scalable, making it suitable for businesses of all sizes, from SMEs to large enterprises. For developers, Budibase provides an open-source core with extensive customization options, while enterprises can leverage advanced features and dedicated support.
Open source platform for AI workflows in TypeScript
Trigger.dev is the open source platform for building AI workflows in TypeScript. It enables developers to create durable, long-running tasks with built-in retries, queues, observability, and elastic scaling. Whether you need to process media, run scheduled tasks, or build AI agents with human-in-the-loop workflows, Trigger.dev provides the infrastructure to keep your processes alive through refreshes, redeploys, and crashes. - Durable AI Agents: Build agents that survive refreshes, redeploys, and crashes with full state persistence - Human-in-the-Loop: Implement approval workflows and manual interventions within automated processes - Real-time Streaming: Stream results directly to your frontend without API routes - Concurrency & Queues: Control task execution with configurable concurrency limits and queue management - Scheduled Tasks: Durable cron schedules that persist across restarts and timeouts - Observability & Monitoring: Real-time tracing, logging, and monitoring of all workflows - Tool Calling: Native support for function calling and external tool integration - Multi-language Support: Run tasks in TypeScript, Python, and other languages - Self-hosting: Deploy Trigger.dev on your own infrastructure - MCP Server Integration: Connect with Model Context Protocol servers for enhanced capabilities Trigger.dev is built with TypeScript and supports self-hosting for full control over your data and infrastructure. The platform is designed for elastic scaling, automatically adjusting resources based on workload demands. Documentation covers quick start guides, framework-specific implementations (Node.js, Next.js, Bun, Remix), and detailed self-hosting instructions. Supported Runtimes: TypeScript, Python, Bun, Node.js Deployment Options: Cloud-hosted (managed) or self-hosted Integration: Works with Anthropic, OpenAI, and other LLM providers Observability: Built-in tracing, metrics, and logging Scalability: Automatic scaling based on task volume and complexity
Durable orchestration platform for managing AI agents, scheduling background tasks, and running mission-critical workflows.
Durable orchestration platform for managing AI agents, scheduling background tasks, and running mission-critical workflows.
Federated open-source short-video platform
Loops is a federated, open-source short-video platform designed to give power back to creators and communities. Built on ActivityPub, it allows users to share videos across compatible fediverse apps while maintaining control over their home server. - Vertical swipe short-video feed – Built for thumb-first browsing with a calm chronological Following feed and a For You feed powered by real engagement signals. - Creator-first camera – Minimal camera interface for capturing vertical loops with quick posting and lens switching. - Threaded conversations – Rich comment threads with replies, likes, and @mentions to keep discussions anchored to videos. - Federated engagement – Likes, shares, reposts, and comment likes travel across the fediverse, enhancing discovery. - Hashtag & search discovery – Tag loops with hashtags and search profiles or videos to find your corner of the fediverse. - Privacy-respecting notifications – Control what pings you, with push notification support coming soon. - ActivityPub compatibility – Connect with Mastodon, Pixelfed, and other fediverse apps while staying in control of your server. - No ads or tracking – Ethical design principles prioritize user privacy over advertising revenue. Loops is open-source and can be self-hosted. The platform is built on ActivityPub, making it interoperable with other federated services. For developers, starter kits and documentation are available to help set up and customize instances. - GitHub Repository: joinloops/loops-server - Starter Kits: joinloops.org/starter-kits - Documentation: joinloops.org/features
About Fastgen
Cello is a user-led growth platform designed to help B2B SaaS companies turn their satisfied customers into powerful advocates. By automating referral programs and incentivizing word-of-mouth marketing, Cello accelerates organic growth without relying on traditional paid channels.
Key Features of Fastgen
- Automated Referral Programs: Set up and manage referral campaigns with ease, including customizable incentives and rewards.
- Customer Advocacy Tracking: Monitor and reward customers who bring in new signups, fostering a community of brand ambassadors.
- Seamless Integration: Works with popular CRM, email, and analytics tools to streamline workflows and data synchronization.
- Performance Analytics: Gain insights into referral program effectiveness with detailed metrics and reporting.
- Multi-Channel Campaigns: Engage users across email, in-app notifications, and social media to maximize reach.
Tech / Self-Hosting
Cello is a cloud-based platform and does not require self-hosting. It is built with scalability and security in mind, ensuring reliable performance for businesses of all sizes.