Open-source SaaS starter kits
The 10 best self-hosted SaaS starter kits in 2026
Asked for the best open-source SaaS starter kits, Claude Sonnet 4.5 puts Bullet Train first this week, scoring it 8.3 out of 10 on its own rubric.
1 new name made the list and 1 dropped off.
A pure AEO test
“Name the 10 open-source SaaS starter kits you would most recommend to a buyer today, and score each one on your rubric.”
This list is only what Claude Sonnet 4.5 says when asked that, from its own knowledge, with no web access and nothing from this site in the prompt.
Nobody here places, edits or reorders an entry. It is a snapshot of how an AI assistant already sees each brand, not a judgement of which product is best.
How it works .
The exact prompt
Category: Open-source SaaS starter kits
What counts as one: A SaaS starter kit is a complete application codebase you download, self-host and own outright, rather than a hosted platform you rent. It ships the parts that are the same in every SaaS product (user authentication, subscription billing, an admin surface, and a database/ORM layer with migrations), so a founder starts from a running app instead of an empty repo. Some are genuinely open source under a permissive licence; others are proprietary codebases sold under a paid licence that still gives you the source, which is a meaningful legal difference even though both are self-hosted.
Name the 10 products in this category you would most recommend to a buyer today, then score every one of them from 1 to 10 on each criterion of your rubric:
- tech_stack_quality (Tech stack & architecture, weight 25): Does it use a modern, well-maintained tech stack with good architectural decisions?
- feature_completeness (Feature completeness, weight 30): How complete and production-ready are the core SaaS features out of the box?
- documentation_support (Documentation & support, weight 20): How good is the documentation, and what support can you expect?
- customization_ease (Customization ease, weight 15): How easy is it to customize and extend for your specific use case?
- license_value (License & pricing value, weight 10): Is the licensing fair and does the pricing represent good value?
For each product give its official website URL, a one sentence neutral description, who it is best for, 2 or 3 strengths, 2 or 3 limitations, and for every criterion a score with a one sentence reason.
JSON shape:
{"products": [{"name": "...", "url": "https://...", "open_source": false, "description": "...", "best_for": "...", "strengths": ["..."], "limitations": ["..."], "scores": {"tech_stack_quality": {"score": 8, "reason": "..."}}}]}
10 tools ranked
Ranked 2026-10-26 by Claude Sonnet 4.5
Refreshed weekly, 3 weeks of history
What counts as open-source SaaS starter kits
A SaaS starter kit is a complete application codebase you download, self-host and own outright, rather than a hosted platform you rent. It ships the parts that are the same in every SaaS product (user authentication, subscription billing, an admin surface, and a database/ORM layer with migrations), so a founder starts from a running app instead of an empty repo. Some are genuinely open source under a permissive licence; others are proprietary codebases sold under a paid licence that still gives you the source, which is a meaningful legal difference even though both are self-hosted.
The rubric
Written by the model for this category before it ranked anything, then frozen so weekly scores stay comparable. Each criterion is scored 1 to 10, and the rank is the weighted average.
Criterion Weight What the model asks of each product
Tech stack & architecture 25% Does it use a modern, well-maintained tech stack with good architectural decisions? Feature completeness 30% How complete and production-ready are the core SaaS features out of the box? Documentation & support 20% How good is the documentation, and what support can you expect? Customization ease 15% How easy is it to customize and extend for your specific use case? License & pricing value 10% Is the licensing fair and does the pricing represent good value?
This week's ranking, with movement since last week and the last 3 weeks of rank.
# Tool Score Change Trend
1
Bullet Train 8.3
▲2 Up 2 from #3
2
SaasRock 8.3
= Same place as last week
3
ShipFast 8.2
▼2 Down 2 from #1
4
Nextless.js 7.7
▲3 Up 3 from #7
5
Makerkit 7.5
▼1 Down 1 from #4
6
Volca 7.5
▲2 Up 2 from #8
7
supastarter 7.4
▼2 Down 2 from #5
8
Divjoy 6.9
▲2 Up 2 from #10
9
Shipped 6.6
new New this week
10
Gravity 6.3
▼1 Down 1 from #9
1▲2
bullettrain.co
Best for Rails developers building sophisticated SaaS products who value open-source and want a mature, battle-tested framework.
An open-source Ruby on Rails SaaS framework with comprehensive team management, permissions, and UI components.
Tech stack & architecture 8
Modern Rails 7 with Hotwire, Tailwind, and PostgreSQL represents a mature, productive stack for those who prefer Rails.
Feature completeness 9
Exceptionally complete with teams, permissions, API, webhooks, and sophisticated CRUD scaffolding built in.
Documentation & support 8
Excellent documentation with guides, screencasts, and an active community, though Rails knowledge is required.
Customization ease 7
Rails conventions make customization straightforward for Rails developers, but the comprehensiveness requires learning.
License & pricing value 10
MIT licensed and completely free with no restrictions represents exceptional value.
What the model rates
Genuinely open-source under MIT license with no restrictions Extremely comprehensive feature set including advanced CRUD scaffolding Mature codebase with years of production use and refinement
What it holds against it
Rails-only, which limits your options if you prefer JavaScript/TypeScript stacks Steeper learning curve due to the framework's comprehensiveness Smaller community compared to JavaScript-based alternatives
Visit Bullet Train
2=
saasrock.com
Best for Teams building B2B SaaS products that need sophisticated multi-tenancy and permission systems from day one.
A Remix-based SaaS framework with multi-tenancy, role-based access control, and comprehensive admin features.
Tech stack & architecture 9
Remix with TypeScript, Prisma, and Tailwind represents a cutting-edge, well-architected stack with excellent performance.
Feature completeness 10
Exceptionally complete with multi-tenancy, RBAC, API generation, analytics, and even a page builder included.
Documentation & support 8
Thorough documentation and video tutorials, though the complexity means more learning is required.
Customization ease 6
The sophisticated architecture provides power but requires understanding the framework's patterns to customize effectively.
License & pricing value 5
At $499-999, it's expensive though the feature set justifies it for the right use case.
What the model rates
Exceptional multi-tenancy architecture with workspace management and granular permissions Built on Remix which offers excellent performance and developer experience Includes advanced features like API generation, workflow automation, and entity builder
What it holds against it
Steeper learning curve due to complexity and Remix framework Higher price point than most alternatives Smaller community compared to Next.js-based options
Visit SaasRock
3▼2
shipfa.st
Best for Solo founders and indie hackers who want to launch a Next.js SaaS quickly and don't mind a proprietary license.
A Next.js boilerplate with authentication, payments, email, and database setup designed to ship SaaS products quickly.
Tech stack & architecture 8
Modern Next.js 14 with App Router, TypeScript, Tailwind, and MongoDB/PostgreSQL options make for a solid foundation.
Feature completeness 9
Includes authentication, Stripe subscriptions, email campaigns, admin dashboard, and landing page components out of the box.
Documentation & support 9
Comprehensive docs with video walkthroughs, active Discord community, and responsive creator support.
Customization ease 7
Well-structured code makes customization straightforward, though you're working within the creator's architectural choices.
License & pricing value 6
At $199-299, it's pricey for a one-time purchase with a restrictive license, though updates are included.
What the model rates
Very comprehensive feature set including Stripe integration, email templates, and SEO optimization Active community and frequent updates from the creator Excellent documentation with video tutorials and deployment guides
What it holds against it
Proprietary license means you're locked into the creator's decisions and update cycle Relatively expensive one-time purchase compared to open-source alternatives Opinionated stack choices may not suit all developers
Visit ShipFast
4▲3
nextlessjs.com
Best for Teams that want AWS infrastructure and serverless architecture baked in from the start with proper IaC.
A Next.js and AWS-based SaaS starter with serverless architecture and infrastructure-as-code included.
Tech stack & architecture 9
Next.js with serverless AWS architecture and IaC represents a modern, scalable, production-grade approach.
Feature completeness 8
Strong core features plus infrastructure and deployment automation, though some advanced SaaS features are basic.
Documentation & support 7
Good technical documentation for setup and deployment, though AWS knowledge is assumed.
Customization ease 6
Serverless architecture and AWS coupling make customization more complex than simpler starters.
License & pricing value 7
Mid-range pricing is fair given the infrastructure automation included.
What the model rates
Includes AWS infrastructure setup with Terraform/CDK for production-ready deployment Serverless architecture provides excellent scalability Comprehensive CI/CD pipeline configuration included
What it holds against it
AWS-specific setup may not suit teams preferring other cloud providers More complex initial setup due to infrastructure requirements Higher operational knowledge required for AWS services
Visit Nextless.js
5▼1
makerkit.dev
Best for Founders who want flexibility in backend choice and need solid multi-tenancy features without extreme complexity.
A Next.js and Firebase/Supabase SaaS starter kit with multiple backend options and strong multi-tenancy support.
Tech stack & architecture 8
Next.js with Firebase or Supabase options provides modern, scalable architecture with good developer experience.
Feature completeness 8
Comprehensive feature set including multi-tenancy, subscriptions, and admin tools, though some areas need polish.
Documentation & support 7
Documentation covers most topics but can be fragmented between versions and occasionally outdated.
Customization ease 7
Reasonably well-structured code allows customization, though the multi-version approach adds some complexity.
License & pricing value 7
Mid-range pricing around $299-499 is fair for the feature set and backend flexibility offered.
What the model rates
Offers both Firebase and Supabase versions, providing backend flexibility Strong multi-tenancy and team management features Active development with regular updates and new features
What it holds against it
Documentation can be inconsistent across different versions Some features feel less polished than premium competitors Community is smaller than top-tier alternatives
Visit Makerkit
6▲2
volca.io
Best for Developers who want a modern Next.js foundation with good DX and don't need extremely advanced features.
A Next.js SaaS starter with a focus on developer experience, including authentication, payments, and email workflows.
Tech stack & architecture 8
Modern Next.js with TypeScript, Prisma, and Tailwind provides a solid, maintainable foundation.
Feature completeness 7
Covers essential SaaS features well but lacks advanced capabilities like multi-tenancy or complex permissions.
Documentation & support 7
Good documentation for core features, though advanced scenarios could use more coverage.
Customization ease 8
Clean architecture and straightforward patterns make customization easy for Next.js developers.
License & pricing value 8
Competitively priced with lifetime updates, offering good value for indie developers.
What the model rates
Clean, well-documented codebase with good TypeScript practices Includes email workflows and transactional email setup Reasonable pricing with lifetime updates
What it holds against it
Feature set is solid but not as comprehensive as premium options Smaller community and ecosystem Less frequent updates compared to more popular alternatives
Visit Volca
7▼2
supastarter.dev
Best for Developers who prefer Supabase as their backend and want flexibility to choose between Next.js or Nuxt frameworks.
A production-ready SaaS starter for Next.js or Nuxt with Supabase backend, offering both React and Vue options.
Tech stack & architecture 8
Modern Next.js/Nuxt with Supabase, TypeScript, and Tailwind make for a solid, maintainable stack.
Feature completeness 7
Covers core SaaS features well but lacks some advanced features like multi-tenancy or complex RBAC.
Documentation & support 7
Good documentation for getting started, though advanced customization guidance could be better.
Customization ease 8
Clean architecture and Supabase's flexibility make customization relatively straightforward.
License & pricing value 7
Reasonably priced at around $199-299 with lifetime updates, offering decent value.
What the model rates
Offers both Next.js and Nuxt versions, giving framework flexibility Deep Supabase integration leveraging its auth, database, and storage features Clean, modern codebase with good TypeScript practices
What it holds against it
Tightly coupled to Supabase, making it harder to switch backends later Smaller feature set compared to some competitors Documentation could be more comprehensive for advanced scenarios
Visit supastarter
8▲2
divjoy.com
Best for Developers who want control over their tech stack choices and prefer to generate a customized starting point.
A React codebase generator that lets you customize your tech stack choices before downloading your starter kit.
Tech stack & architecture 7
Quality depends on your choices, but the React foundation and modern library options are solid.
Feature completeness 6
Covers authentication and basic UI components well but lacks advanced SaaS features like billing or admin dashboards.
Documentation & support 6
Good documentation for the generator itself, but post-generation support is minimal.
Customization ease 9
Since you choose your stack upfront and get clean generated code, customization is very straightforward.
License & pricing value 8
At $59-199, it's affordable and the customization approach provides good value for the right user.
What the model rates
Unique generator approach lets you choose your preferred libraries and frameworks Supports multiple UI frameworks, auth providers, and databases Clean, well-organized code output
What it holds against it
Generated code means less ongoing updates compared to maintained boilerplates Feature set is more basic than comprehensive SaaS starters Support is limited after generation
Visit Divjoy
9new
shipped.club
Best for Solo developers who want to ship quickly with a Supabase backend and don't need extensive customization.
A Next.js starter kit focused on rapid deployment with Supabase backend and Stripe integration.
Tech stack & architecture 7
Next.js with Supabase is a solid modern stack, though the implementation is more basic than premium options.
Feature completeness 6
Covers core authentication and payments but lacks advanced features like admin dashboards or multi-tenancy.
Documentation & support 6
Basic documentation covers setup and deployment but lacks depth for customization and troubleshooting.
Customization ease 7
Simple structure makes it easy to modify, though you'll need to build more advanced features yourself.
License & pricing value 8
Lower price point makes it accessible for bootstrappers while still providing source access.
What the model rates
Very quick setup and deployment process Good Supabase integration with auth and database Affordable pricing for indie hackers
What it holds against it
More basic feature set compared to comprehensive alternatives Limited documentation for advanced use cases Smaller community and less active development
Visit Shipped
10▼1
usegravity.app
Best for Developers comfortable with traditional Node.js/Express architecture who want a straightforward, no-frills starter.
A Node.js and React SaaS boilerplate with a focus on simplicity and getting to market quickly.
Tech stack & architecture 6
Traditional Node.js/Express with React is solid but less modern than full-stack frameworks like Next.js or Remix.
Feature completeness 6
Covers authentication and payments but lacks advanced features like multi-tenancy or comprehensive admin tools.
Documentation & support 6
Basic documentation covers setup and core features but lacks depth for complex scenarios.
Customization ease 7
Simple architecture makes it easy to understand and modify, though you'll build more from scratch.
License & pricing value 8
More affordable than premium options while still providing source code access and updates.
What the model rates
Simple, understandable architecture without over-engineering Includes essential features without bloat Lower price point than many competitors
What it holds against it
Less modern stack compared to Next.js or Remix alternatives Smaller community and less frequent updates More basic feature set may require more custom development
Visit Gravity
Dropped off since last week
How to rank higher on this list
The model can only score what it already knows about you. For each criterion, this is what it says would raise its score:
Tech stack & architecture. Use current stable versions of popular frameworks (Next.js, React, TypeScript, Prisma, etc.), demonstrate clear separation of concerns, and publish architecture documentation showing thoughtful design patterns rather than quick hacks.Feature completeness. Ship with fully working authentication (including social logins and magic links), Stripe subscription billing with webhooks properly handled, team/organization support, role-based permissions, a functional admin panel, email templates, and a polished UI—not just placeholder code or TODO comments.Documentation & support. Provide comprehensive setup guides, deployment tutorials for major platforms (Vercel, Railway, AWS), clear explanations of the codebase structure, video walkthroughs, and either active community support (Discord/GitHub discussions) or responsive paid support channels.Customization ease. Write clean, well-commented code following standard conventions, use modular architecture that allows swapping components, provide examples of common customizations, and avoid over-abstraction or proprietary patterns that lock you into specific approaches.License & pricing value. For open-source options, use truly permissive licenses (MIT, Apache 2.0) without hidden restrictions. For paid options, offer transparent one-time pricing without recurring fees, unlimited project usage, and lifetime updates—making the total cost of ownership clear and reasonable compared to building from scratch.
How to improve your AEO covers the general playbook.