Celoxis vs Slack: Complete Comparison (2026)
An in-depth comparison of Celoxis and Slack to help you choose the right tool for your business.
Last updated: November 2026
Celoxis
6.5/10
Celoxis is project portfolio management software for PMOs and mid-to-large organizations. It covers scheduling, resource capacity, timesheets, project financials and client portals, in the cloud or on-premise.
Slack
7.1/10
Slack is a channel-based messaging platform from Salesforce, with Lists, canvases, huddles and Workflow Builder for team coordination and light task tracking.
Feature-by-Feature Comparison
| Feature | | |
|---|---|---|
| Scores | ||
| Overall Rating | 6.5/10 | 7.1/10 |
| Analytics | 8/10 | 3/10 |
| Cost | 6/10 | 5/10 |
| Customization | 8/10 | 7/10 |
| Ease of Use | 5/10 | 7/10 |
| Integration | 5/10 | 10/10 |
| Scalability | 8/10 | 9/10 |
| Security | 7/10 | 9/10 |
| Support | 7/10 | 6/10 |
| Pricing | ||
| Free plan | No | Yes |
| Cheapest paid plan | $10/user/mo Core | €8/user/mo Pro |
| Estimated cost for 10 users | $450/mo Business | Free Free |
| Features | ||
| Gantt charts | ||
| Time tracking | ||
| App integrations | ||
| Client collaboration | ||
| Collaboration tools | ||
| File sharing | ||
| Task lists | ||
| Task management | ||
| Dashboards | Not listed | |
| Docs | Not listed | |
| Kanban boards | Not listed | |
| Reporting | Not listed | |
| Scheduling | Not listed | |
| Spreadsheet interface | Not listed | |
| Team messaging | Not listed | |
| Timeline view | Not listed | |
| Workflow automation | Not listed | |
Celoxis vs Slack cost by team size
| Team size | Celoxis | Slack |
|---|---|---|
| 1 user | Contact for pricing | FreeFree |
| 5 users | $225/moBusiness | FreeFree |
| 10 users | $450/moBusiness | FreeFree |
| 25 users | $1,125/moBusiness | FreeFree |
| 50 users | $2,250/moBusiness | FreeFree |
The plan that fits each team size, billed monthly, before add-ons and usage charges. Each cost opens that tool's pricing calculator for the team size.
Which One Should You Choose?
Why choose Celoxis
- Higher Analytics score (8/10 vs 3/10)
- Higher Cost score (6/10 vs 5/10)
- Includes Gantt charts, which Slack lacks
- Includes Time tracking, which Slack lacks
Why choose Slack
- Has a free plan (Celoxis does not)
- Higher Integration score (10/10 vs 5/10)
- Higher Ease of Use score (7/10 vs 5/10)
- Better fit for startups (8/10 vs 3/10)
- Better fit for small business (8/10 vs 4/10)
Pros & Cons
Celoxis
Pros
- Dashboards and real-time reporting are the most praised feature in user reviews.
- It combines scheduling, resource capacity, timesheets, costing and billing in one tool, which suits PMOs.
- Read-only and client users are free, and the Business plan includes a client portal.
- It can be deployed on-premise as well as in the cloud, which few competitors offer.
- Customer queries are answered by engineers rather than scripted agents.
Cons
- Users describe the interface as cluttered and harder to navigate than it should be.
- Every plan requires at least five full-access users, and the published prices are annual only.
- Integrations such as Jira and QuickBooks cost extra below the Enterprise plan.
- Setting up tasks and recording progress takes noticeable effort, according to reviewers.
Slack
Pros
- The app ecosystem is very large, and tools such as ClickUp, Notion, HubSpot and Clockify can post updates into channels.
- Slack Connect lets teams work in shared channels with up to 250 outside organizations on paid plans.
- Compliance coverage is broad, including ISO 27001, SOC 2 Type II, FedRAMP Moderate and HIPAA configurability.
- Lists add table and board layouts with assignees, due dates and subtasks, without leaving chat.
- Workflow Builder automates routine requests and approvals without code.
Cons
- There are no native Gantt charts, dependencies, time tracking or portfolio reporting, so Slack doesn't replace a dedicated PM tool.
- Frequent notifications and busy channels can interrupt focus, a common complaint in reviews.
- The free plan keeps only 90 days of message history and allows 10 apps.
- Advanced AI features require Business+ or above, and per-user costs add up as teams grow.
- Reviewers report that finding older messages through search can be difficult.
Not sold on either?
Frequently Asked Questions
Slack scores higher on our Project Management criteria: 7.1/10 against 6.5/10 for Celoxis. The largest gap is in Analytics: 8/10 for Celoxis and 3/10 for Slack.
Slack has a free plan; Celoxis does not list one.
Slack is the better fit for startups: we rate it 8/10 for them, against 3/10 for Celoxis.
Celoxis has Gantt charts and Time tracking, which Slack lacks.
