MantisBT vs Redmine vs Flyspray: Best Self-Hosted Bug Tracker 2026

If your team tracks bugs in spreadsheets, email threads, or a SaaS tool you do not fully control, it is time to take ownership of your issue tracking. Self-hosted bug trackers give you complete data sovereignty, unlimited customization, and zero per-seat pricing — a combination that proprietary tools simply cannot match.

In this guide, we compare three mature, open-source bug tracking systems that have been battle-tested by thousands of organizations: MantisBT, Redmine, and Flyspray. Each serves a different audience — from lightweight personal projects to enterprise-grade software teams — so we will help you pick the right one.

Why Self-Host Your Bug Tracker

Running your own bug tracking server offers several concrete advantages over cloud-hosted SaaS alternatives:

• Full data ownership: Every bug report, attachment, and comment lives on your infrastructure. No third-party vendor lock-in or data retention surprises.
• No per-user licensing: All three tools discussed here are completely free regardless of team size. Add 5 users or 500 without paying extra.
• Custom workflows: Define custom issue statuses, priority levels, severity classifications, and resolution categories that match your team’s actual process.
• Deep integration: Self-hosted tools integrate natively with other services on your network — Git repositories, CI/CD pipelines, LDAP directories, and internal wikis.
• Offline capability: Your bug tracker remains accessible even during internet outages, which matters for teams running air-gapped or restricted networks.
• Audit trail: Every change is logged locally, making it straightforward to comply with internal security audits and regulatory requirements.

For teams already running other self-hosted services like helpdesk platforms or project management tools, adding a dedicated bug tracker to the same infrastructure is a natural next step.

MantisBT — Lightweight, Fast, and PHP-Based

GitHub: mantisbt/mantisbt | Stars: 1,762 | Language: PHP | Last updated: April 2026

MantisBT (Mantis Bug Tracker) is one of the oldest and most widely used open-source issue tracking systems. First released in 2000, it has matured into a stable, feature-rich platform that prioritizes simplicity and speed.

Key Features

• Role-based access control: Reporter, viewer, updater, developer, manager, and administrator roles with granular permission settings per project.
• Custom fields: Add custom text, numeric, date, email, and multi-select fields to bug reports without modifying source code.
• Email integration: Create issues by sending emails to a configured address; receive notifications on status changes, assignments, and comments.
• Time tracking: Built-in time logging per issue with summary reports for billing and capacity planning.
• Roadmap and version management: Track release milestones, target versions, and overdue issues across projects.
• RSS feeds: Subscribe to issue activity feeds for any project, category, or custom filter.
• Plugin ecosystem: Extend functionality with official and community plugins for LDAP, LDAP authentication, REST API enhancements, and more.

docker Compose Setup

MantisBT requires a PHP runtime and a MySQL/MariaDB database. Here is a production-ready Docker Compose configuration:

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version: "3.8"

services:
  mantis-db:
    image: mariadb:11
    container_name: mantis-db
    restart: unless-stopped
    environment:
      MYSQL_ROOT_PASSWORD: rootsecret123
      MYSQL_DATABASE: mantis
      MYSQL_USER: mantis
      MYSQL_PASSWORD: mantissecret
    volumes:
      - mantis-db-data:/var/lib/mysql
    networks:
      - mantis-net

  mantis-app:
    image: vimagick/mantisbt:latest
    container_name: mantis-app
    restart: unless-stopped
    ports:
      - "8080:80"
    environment:
      MANTIS_DB_HOST: mantis-db
      MANTIS_DB_NAME: mantis
      MANTIS_DB_USER: mantis
      MANTIS_DB_PASS: mantissecret
      MANTIS_ADMIN_USER: administrator
      MANTIS_ADMIN_PASS: admin123
      MANTIS_EMAIL_WEBMASTER: admin@example.com
      MANTIS_EMAIL_FROM: noreply@example.com
    depends_on:
      - mantis-db
    networks:
      - mantis-net

volumes:
  mantis-db-data:

networks:
  mantis-net:
    driver: bridge

Start the stack with docker compose up -d, then access MantisBT at http://your-server:8080. The first-run wizard will guide you through database initialization and admin account setup.

When to Choose MantisBT

MantisBT is the right choice when you want a no-nonsense bug tracker that installs quickly, uses minimal resources, and covers the essentials without overwhelming complexity. It is particularly popular with small-to-medium development teams, open-source projects, and IT departments that need straightforward issue tracking without the overhead of full project management suites.

Redmine — The Full-Featured Project Management Suite

GitHub: redmine/redmine | Stars: 5,927 | Language: Ruby | Last updated: April 2026

Redmine is far more than a bug tracker — it is a complete project management platform built on Ruby on Rails. While MantisBT focuses narrowly on issue tracking, Redmine bundles wikis, forums, Gantt charts, time tracking, file management, and calendar views into a single integrated system.

Key Features

• Multi-project support: Manage dozens of projects under one Redmine instance with separate issue trackers, wikis, and member rosters per project.
• Gantt charts and calendars: Visual project timelines that auto-generate from issue start/due dates and version milestones.
• Issue tracking with workflow engine: Define custom workflows that control which status transitions are allowed per role and tracker type (bug, feature, support request, etc.).
• Wiki per project: Each project gets its own wiki with Markdown or Textile formatting, file attachments, and version history.
• Repository integration: Native support for Git, Subversion, Mercurial, CVS, and Bazaar. View commits, diffs, and revisions directly within Redmine; auto-link commits to issues with keyword patterns.
• Time tracking and reporting: Log time against issues, generate billable-hour reports, and export data to CSV or PDF.
• REST API: Comprehensive JSON/XML API for automating issue creation, querying, and integration with external tools.
• Plugin marketplace: Over 1,000 community plugins covering agile boards, CRM, helpdesk, document management, and more.

Docker Compose Setup

Redmine runs on Ruby on Rails with PostgreSQL or MySQL. The official Docker image makes setup straightforward:

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version: "3.8"

services:
  redmine-db:
    image: postgres:16-alpine
    container_name: redmine-db
    restart: unless-stopped
    environment:
      POSTGRES_DB: redmine
      POSTGRES_USER: redmine
      POSTGRES_PASSWORD: redminesecret
    volumes:
      - redmine-db-data:/var/lib/postgresql/data
    networks:
      - redmine-net

  redmine-app:
    image: redmine:5.1-alpine
    container_name: redmine-app
    restart: unless-stopped
    ports:
      - "3000:3000"
    environment:
      REDMINE_DB_POSTGRES: redmine-db
      REDMINE_DB_DATABASE: redmine
      REDMINE_DB_USERNAME: redmine
      REDMINE_DB_PASSWORD: redminesecret
      REDMINE_SECRET_KEY_BASE: your-secret-key-change-this
    depends_on:
      - redmine-db
    networks:
      - redmine-net

volumes:
  redmine-db-data:

networks:
  redmine-net:
    driver: bridge

Launch with docker compose up -d and access Redmine at http://your-server:3000. Default admin credentials are admin / admin — change them immediately on first login.

When to Choose Redmine

Redmine is the best choice for teams that need more than bug tracking alone. If your organization wants a single platform that handles issue tracking, documentation (wiki), project timelines (Gantt), version control browsing, and time accounting, Redmine eliminates the need for multiple separate tools. It is widely used by universities, government agencies, and mid-size software companies.

Flyspray — Minimalist and Developer-Focused

GitHub: flyspray/flyspray | Stars: 387 | Language: PHP | Last updated: December 2025

Flyspray is a lightweight, PHP-based bug tracking system that strips away the complexity of heavier platforms. It is designed for small teams and individual developers who want a fast, clean interface for managing bug reports and feature requests without the learning curve of a full project management suite.

Key Features

• Simple, clean interface: Flyspray prioritizes usability with a no-frills UI that loads quickly and requires zero training to use.
• Task categories and severity levels: Organize issues by category (frontend, backend, documentation) and severity (critical, major, minor, trivial).
• Effort tracking: Estimate and log time spent on each task for capacity planning.
• Notification system: Email notifications for assignments, status changes, and new comments with customizable per-user preferences.
• Advanced search and filters: Save custom search filters for quick access to your assigned tasks, open critical bugs, or recently updated items.
• Progress tracking: Set percentage-complete values on tasks and view project-level progress at a glance.
• Theme support: Choose from built-in themes or customize the interface with CSS overrides.
• OAuth and LDAP: Support for OAuth2 (Google, GitHub) and LDAP authentication in recent versions.

Docker Compose Setup

Flyspray requires PHP and a PostgreSQL or MySQL database. A community-maintained Docker Compose setup looks like this:

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version: "3.8"

services:
  flyspray-db:
    image: postgres:16-alpine
    container_name: flyspray-db
    restart: unless-stopped
    environment:
      POSTGRES_DB: flyspray
      POSTGRES_USER: flyspray
      POSTGRES_PASSWORD: flyspraysecret
    volumes:
      - flyspray-db-data:/var/lib/postgresql/data
    networks:
      - flyspray-net

  flyspray-app:
    image: ghcr.io/flyspray/flyspray:latest
    container_name: flyspray-app
    restart: unless-stopped
    ports:
      - "8085:80"
    environment:
      FLYSPRAY_DB_TYPE: pgsql
      FLYSPRAY_DB_HOST: flyspray-db
      FLYSPRAY_DB_NAME: flyspray
      FLYSPRAY_DB_USER: flyspray
      FLYSPRAY_DB_PASS: flyspraysecret
    depends_on:
      - flyspray-db
    networks:
      - flyspray-net

volumes:
  flyspray-db-data:

networks:
  flyspray-net:
    driver: bridge

Note that Flyspray’s Docker image situation is less mature than MantisBT or Redmine. If the official image is unavailable, you can also run Flyspray on anginxandard PHP + PostgreSQL stack using Apache or Nginx. After downloading the source from GitHub, point your web server to the Flyspray directory and complete the browser-based installer.

When to Choose Flyspray

Flyspray is ideal for small teams, solo developers, and open-source projects that want a bug tracker that “just works.” It has the smallest resource footprint of the three tools and the shortest setup time. If you do not need wikis, Gantt charts, or multi-project hierarchies, Flyspray gives you the core issue tracking functionality without the bloat.

Head-to-Head Comparison

Which One Should You Pick?

Choose MantisBT if:

• You want a dedicated bug tracker that is fast, stable, and familiar to many developers
• Your team needs email-based issue creation and notifications out of the box
• You value a mature ecosystem with active development since 2000
• You need custom fields and role-based permissions without heavy configuration

Choose Redmine if:

• You want an all-in-one platform combining bug tracking, wiki, Gantt charts, and repository browsing
• Your organization manages multiple projects and needs per-project isolation
• You need the most powerful workflow engine of the three tools
• You want access to a large plugin marketplace for extending functionality

Choose Flyspray if:

• You want the simplest possible setup with the lowest resource requirements
• Your team is small (1-10 people) and does not need wikis or Gantt charts
• You prefer a clean, modern UI that requires zero training
• You are running on limited hardware or a low-cost VPS

For teams that also need kanban board functionality alongside issue tracking, Redmine’s plugin ecosystem offers agile board extensions, while MantisBT and Flyspray users typically pair their bug tracker with a separate kanban tool.

FAQ

Which bug tracker is best for a small team?

For teams under 10 people, Flyspray or MantisBT are the best choices. Flyspray has the simplest interface and lowest setup overhead, while MantisBT offers more features like custom fields and time tracking without much additional complexity. Redmine is powerful but can feel like overkill for small teams.

Can I migrate issues from Jira or GitHub to these tools?

Yes, all three tools support CSV import, and there are community migration scripts for Jira and GitHub Issues. Redmine has the most mature migration ecosystem with dedicated plugins for Jira-to-Redmine conversion. MantisBT offers a CSV import plugin that handles most field mappings automatically.

Do these bug trackers support Git integration?

Redmine has the strongest Git integration out of the box — it can browse repositories, display commits and diffs, and auto-link commit messages to issues using keywords like “fixes #123.” MantisBT supports Git integration via plugins like Source Integration. Flyspray does not have built-in Git integration but supports it through webhooks and third-party scripts.

Which tool has the best mobile experience?

None of the three tools has an official mobile app. However, MantisBT and Redmine both offer responsive web interfaces that work adequately on mobile browsers. For full mobile support, you would need to use the REST API (available in MantisBT and Redmine) with a third-party mobile client or build a custom frontend.

Can I use these bug trackers behind a reverse proxy?

Yes, all three tools work behind Nginx, Caddy, or Apache reverse proxies. The Docker Compose configurations in this guide expose the apps on local ports — simply add a reverse proxy entry that routes your domain to the appropriate port. For TLS termination, Caddy is the simplest option as it handles automatic certificate provisioning.

How do these compare to modern alternatives like Plane or Vikunja?

Plane and Vikunja are newer projects with more modern UIs and built-in agile features like sprint planning and kanban boards. However, they are also less mature. MantisBT, Redmine, and Flyspray have been in production use for over a decade, have larger plugin ecosystems, and are battle-tested by thousands of organizations. If you need cutting-edge features, explore newer tools; if you need reliability and stability, the three tools covered here remain excellent choices.