Open source alternatives to popular SaaS
Hand-curated open-source alternatives to the SaaS products developers ask about most. Each page ranks the candidates by PopScore (the projects with real momentum rise to the top) and includes a decision context for every replacement.
DevOps & infrastructure
Slack
Salesforce
Cloud-based team chat with channels, threads, integrations, and voice huddles.
4 candidates
Vercel
Vercel, Inc.
Cloud platform for frontend frameworks and serverless functions.
4 candidates
Linear
Linear, Inc.
Issue tracking and project management for software teams.
3 candidates
Auth0
Okta, Inc.
Identity platform for authentication, authorization, and user management.
4 candidates
SendGrid
Twilio, Inc.
Email delivery platform for transactional and marketing emails.
3 candidates
CircleCI
Circle Internet Services, Inc.
Cloud-based CI/CD platform with workflows, orbs, and parallelism.
3 candidates
Datadog
Datadog, Inc.
Cloud monitoring as a service: metrics, logs, traces, and APM.
4 candidates
Zoom
Zoom Communications, Inc.
Video conferencing with meetings, webinars, and team chat.
3 candidates
Calendly
Calendly LLC
Scheduling tool with calendar sync, routing, and team availability.
2 candidates
NGINX Plus
F5 Networks, Inc.
Web server, reverse proxy, and load balancer.
3 candidates
Docker Hub
Docker, Inc.
Container image registry with public and private repositories.
2 candidates
Segment
Twilio, Inc.
Customer data platform for event collection, routing, and identity.
2 candidates
LaunchDarkly
LaunchDarkly, Inc.
Feature flag service with percentage rollouts, experimentation, and audit logs.
3 candidates
Backstage
Spotify AB
Internal developer portal with a service catalog, scaffolder, and plugins.
2 candidates
GitHub Codespaces
GitHub, Inc.
Cloud-hosted development environments with VS Code in the browser.
2 candidates
Loom
Atlassian, Inc.
Async video messaging with screen recording and AI summaries.
2 candidates
1Password
AgileBits, Inc.
Team password manager with vaults, sharing, and audit logs.
2 candidates
Web frameworks
Notion
Notion Labs
All-in-one workspace combining docs, databases, and project management.
5 candidates
Figma
Figma (Adobe)
Browser-based collaborative design tool for UI/UX.
4 candidates
Mixpanel
Mixpanel, Inc.
Product analytics with events, funnels, retention, and cohorts.
4 candidates
Contentful
Contentful GmbH
Headless CMS with structured content, APIs, and localization.
4 candidates
Typeform
Typeform, S.L.
Conversational form and survey builder with conditional logic.
3 candidates
Lucidchart
Lucid Software, Inc.
Collaborative diagramming tool for flowcharts, UML, and ERDs.
3 candidates
Webflow
Webflow, Inc.
Visual website builder with CMS, hosting, and animations.
2 candidates
Zendesk
Zendesk, Inc.
Customer support helpdesk with ticketing, knowledge base, and live chat.
2 candidates
CLI & dev tools
Postman
Postman, Inc.
API client for testing, documenting, and sharing HTTP requests.
4 candidates
Evernote
Bending Spoons S.p.A.
Note-taking app with notebooks, web clipping, and OCR.
3 candidates
Cursor
Anysphere, Inc.
AI-first code editor built on VS Code with deep LLM integration.
3 candidates
ScrapingBee
ScrapingBee, Inc.
Web scraping API that handles headless browsers and proxies.
3 candidates
Databases & storage
Supabase
Supabase, Inc.
Open-source Firebase alternative with Postgres, auth, storage, and edge functions.
4 candidates
Airtable
Airtable, Inc.
Spreadsheet-database hybrid with views, automations, and integrations.
4 candidates
Algolia
Algolia, Inc.
Search-as-a-service with typo tolerance, ranking, and instant search UI.
3 candidates
Pinecone
Pinecone Systems, Inc.
Managed vector database for similarity search and RAG.
4 candidates
Amazon S3
Amazon Web Services, Inc.
Object storage with HTTP APIs, lifecycle rules, and event notifications.
3 candidates
HubSpot CRM
HubSpot, Inc.
CRM with marketing, sales, and customer service hubs.
3 candidates
Looking for a comparison of two specific projects? The compare matrix has 60+ "X vs Y" pages. Looking for curated "best of" lists by category? See Best AI tools 2026 (and the 7 other category editions).