Which Self‑Hosted Helpdesk Fits Your Team? A Full Feature Comparison

Zammad – Overall Best

Zammad is the most feature‑complete self‑hosted helpdesk, supporting email, chat, phone (CTI), Twitter, Facebook, Telegram, and WhatsApp in a single UI. It uses Elasticsearch for full‑text indexing of tickets, attachments, and email bodies, and includes SLA management, knowledge bases, time tracking, and AI features (via Ollama) under an AGPL‑3.0 license. Built‑in migration tools simplify moving from Freshdesk or Zendesk.

Pros: All core features included, Elasticsearch full‑text search, migration tools, AI integration, SAML/OIDC/LDAP authentication, automatic daily backups.

Cons: Requires 4‑8 GB RAM (Elasticsearch heavy), complex Docker stack with ten services, no native mobile app, Ruby on Rails stack may be unfamiliar to sysadmins.

Best for: Teams of five or more agents needing multi‑channel support, full‑text search, and enterprise‑grade features without per‑seat fees.

FreeScout – Lightest Option

FreeScout replicates Help Scout’s shared inbox experience in a single PHP container with MariaDB, running on as little as 256 MB RAM. Core email conversation handling is included; additional modules (knowledge base, satisfaction ratings, time tracking, Slack, LDAP) are paid.

Pros: Extremely low resource footprint, clean Help Scout‑inspired UI, active development, rich module ecosystem, simple single‑container deployment.

Cons: Many useful features require paid modules, no built‑in chat (requires $9 module), lacks Elasticsearch (uses MySQL full‑text), PHP/Laravel stack is less modern than Go or Elixir alternatives.

Best for: Small teams (1‑5 agents) focused on email‑only support who want a minimal, inexpensive deployment.

LibreDesk – Modern Lightweight Choice

LibreDesk is a 2026 newcomer distributed as a single Go binary. It offers shared inboxes, SLA management, automation rules, CSAT surveys, auto‑assignment, role‑based access, webhooks, and AI‑assisted response rewriting—all free and open source. The frontend is built with Vue.js 3 and connects to email via IMAP/SMTP or OAuth providers.

Pros: Single binary for fast startup and easy upgrades, free SLA/automation/CSAT/AI, modern Vue.js UI with command bar, low memory (≈512 MB), OpenID Connect SSO.

Cons: Very new project with a small community, no chat widget (email only), limited integrations beyond webhooks, no knowledge‑base feature.

Best for: Teams that want a modern, lightweight helpdesk and are comfortable trying a newer open‑source project.

osTicket – Pure Email Support

osTicket has been handling support tickets since 2003. It converts incoming emails into tickets, assigns them, tracks SLA, and provides a basic knowledge base. The stack is simple PHP + MySQL.

Pros: Proven stability (20+ years, >5 million downloads), straightforward PHP/MySQL deployment, email‑to‑ticket routing, SLA tracking, built‑in knowledge base.

Cons: Outdated UI, no real‑time chat, no social media channels, limited API, community edition updates are infrequent.

Best for: Organizations that need reliable email‑only ticket handling and do not require a modern UI.

OTOBO – ITSM/ITIL Focus

OTOBO is an open‑source fork of OTRS that fully implements the ITIL framework, offering incident, problem, change management, SLA execution, service catalog, and a CMDB for asset tracking.

Pros: Complete ITIL lifecycle, CMDB, Elasticsearch search, customer portal, migration path from OTRS, actively developed by Rother OSS GmbH.

Cons: Requires 4‑8 GB RAM (Elasticsearch + Perl + MariaDB), complex five‑container deployment, feature‑rich for simple support use cases, Perl stack may be unfamiliar, steep learning curve for non‑ITIL teams.

Best for: IT departments that need full ITIL compliance, change‑management workflows, and asset tracking.

MantisBT – Defect Tracking

MantisBT, started in 2000, is a mature open‑source issue tracker. It supports custom fields, email notifications, role‑based access, and multi‑project defect management. It is not a customer‑facing helpdesk.

Pros: 25 years of stability, lightweight (128‑256 MB RAM), multi‑project support with custom fields, simple PHP + MariaDB deployment, extensible plugin system.

Cons: Outdated UI, no customer portal, no real‑time features, limited to internal defect tracking, no chat or social media channels.

Best for: Development teams that need a dedicated bug/issue tracker separate from their code hosting platform.

GlitchTip – Error Tracking

GlitchTip tracks application errors rather than customer conversations. It is compatible with the Sentry SDK, captures crashes, stack traces, and performance data, and includes uptime monitoring.

Pros: Sentry‑compatible SDK (no code changes), built‑in uptime monitoring, lightweight (≈512 MB RAM), unlimited events (no per‑event billing), 90‑day configurable data retention.

Cons: Not a customer‑service platform (error‑only), lacks session replay or performance analysis, dashboard less feature‑rich than Sentry.

Best for: Development teams that need error tracking and uptime monitoring without Sentry’s pay‑per‑event model.

Evaluation Criteria

Feature completeness – Can the tool handle core customer‑service workflows (receive, assign, track, resolve, report)?

Deployment simplicity – Number of Docker services required and initial configuration complexity.

Resource efficiency – Memory and disk requirements relative to provided features.

Community & maintenance – Development activity, release frequency, community size.

Migration path – Ability to import data from commercial tools.

Extensibility – Quality of API, plugin/module ecosystem, webhook support.

Each tool was deployed via Docker, its agent workflow (ticket creation, assignment, resolution, search) was tested, and documentation quality was reviewed.

Feature Matrix (excerpt)

Tool        License   Primary Use          Email Ticket  Real‑time Chat  CTI  Social Channels  Knowledge Base  SLA Mgmt  CMDB  AI  SSO/SAML  Full‑text Search  Min RAM  Docker Services  Language
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Zammad      AGPL‑3.0  Customer Service     Yes           Yes            Yes   Twitter, FB, TG, WA  Yes          Yes      No    Yes  Yes       Elasticsearch       4 GB    10               Ruby
FreeScout   AGPL‑3.0  Customer Service     Yes           Module ($9)    No    Module            Module ($10) No       Yes    No   Module ($10) MySQL               256 MB  2                PHP
LibreDesk   AGPL‑3.0  Customer Service     Yes           No             No    No                No           Yes      No    Yes  OIDC      PostgreSQL         512 MB  3                Go
osTicket    GPL‑2.0   Customer Service     Yes           No             No    No                Yes          Yes      No    No   LDAP       MySQL               512 MB  2                PHP
OTOBO       GPL‑3.0   IT Service Management Yes          No             Yes   No                Yes          Yes      Yes   Yes  Yes       Elasticsearch       4 GB    5                Perl
MantisBT    GPL‑2.0   Defect Tracking      Yes (notify)  No             No    No                No           No       No    No   LDAP       MySQL               256 MB  2                PHP
GlitchTip   MIT       Error Tracking      No            No             No    No                No           No       No    No   OAuth      PostgreSQL          512 MB  4                Python

Common Questions

Which platform for a 3‑agent team?

FreeScout is recommended. It runs on a $4‑per‑month VPS, handles email support well, and can add a $9 chat module later if needed.

Which platform for a team of over 20 agents?

Zammad is the choice. It scales to multi‑channel support, includes Elasticsearch for fast search, and offers all features without per‑seat fees.

Can I migrate from Zendesk or Freshdesk?

Zammad provides built‑in migration tools for both Zendesk and Freshdesk. Other tools require manual export via API.

Which tool supports ITIL?

Only OTOBO offers a complete ITIL implementation, covering incident, problem, change management, and a CMDB.

Best for a SaaS company?

Zammad or LibreDesk. Zammad is mature; LibreDesk is lighter and more modern.