OpenProject vs Mattermost Comparison
OpenProject
Starting at Contact for pricing
- Free Trial
- Freelancers / Consultants
- Large Enterprises
OpenProject is a collaborative project management software for planning, tracking, and reporting on projects. It emphasizes usability – before users start a project, they need a tool that enables them to start working ef…
Mattermost
Starting at $3.25 /User/Month
- Free Trial
- Large Enterprises
- Medium Business
Mattermost is an open source messaging platform that brings all business communication into one place. More than just chat, Mattermost is built around a modern team communication workflow. It includes integrated video co…
Mattermost leads on user satisfaction with a 4.8-star rating across 34 reviews.
OpenProject vs Mattermost — at a glance
| Feature | OpenProject | Mattermost |
|---|---|---|
| Rating | 3.7 / 5 | 4.8 / 5 |
| Reviews | 17 | 34 |
| Starting price | Contact for pricing | $3.25 /User/Month |
| Free trial | Yes | Yes |
| Free version | No | No |
| Best for | Freelancers / Consultants, Large Enterprises, Medium Business | Large Enterprises, Medium Business, Small Business |
| Category | Project Management Software | Business Instant Messaging Software |
| Platforms | SaaS/Web/Cloud, Installed - Mac | SaaS/Web/Cloud, Mobile - Android, Mobile - iOS, Installed - Windows, Installed - Mac |
| API | Available | Available |
| Support modes | Business Hours, Online | Online |
| Certifications | — | — |
| Data residency | Global | Global |
Key differences between OpenProject and Mattermost
- Pricing: Mattermost starts at $3.25 /User/Month. OpenProject pricing is not publicly listed.
- Target audience: OpenProject is built for Freelancers / Consultants and Large Enterprises, while Mattermost targets Large Enterprises and Medium Business.
- User satisfaction: Mattermost scores higher with a 4.8-star average.
- Deployment: OpenProject supports SaaS/Web/Cloud, Installed - Mac; Mattermost supports SaaS/Web/Cloud, Mobile - Android, Mobile - iOS, Installed - Windows, Installed - Mac.
OpenProject vs Mattermost — find the better fit before you commit.
Which tool fits your team best
Which is actually cheaper for your team size
Where each product wins, per real buyers
Most Project Management Software tools look identical on paper. This comparison cuts to the differences that matter — pricing structure, team fit, and what real buyers found after signing up.
Biggest differences
Features
Pricing
Buying details
Security
Buyer feedback
Integrations
Product tour
Other options
Talk to an expert Talk to an expert | Talk to an expert Talk to an expert |
Free PDF comparison
Download this OpenProject vs Mattermost comparison
Get the full side-by-side as a PDF — these picks plus the top Project Management Software tools, with verified ratings, pricing and features.
- Side-by-side on pricing, features & ratings
- Plus the category top 10, scored & ranked
- Emailed to you — no on-screen download
No file downloads on screen — we email it to you. One-click unsubscribe anytime.
Biggest differences
Start here before you go deeper into features.
Freelancers / Consultants, Large Enterprises, Medium Business
Large Enterprises, Medium Business, Small Business
OpenProject typically suits Freelancers / Consultants and Large Enterprises. Mattermost tends to fit Large Enterprises and Medium Business better. The right choice depends on your team size, workflow, and whether a free trial matters.
Description | OpenProject is a collaborative project management software for planning, tracking, and reporting on projects. It emphasizes usability – before users start a project, they need a tool that ... Read More about OpenProject | Mattermost is an open source messaging platform that brings all business communication into one place. More than just chat, Mattermost is built around a modern team communication workflow. ... Read More about Mattermost |
|---|---|---|
Entry Level Pricing |
|
|
Free Trial Availability |
| |
SpotScoreWhat's this? ↗ | 8.8/10 | Not Available |
User RatingsBased on verified Spotsaas reviews | ||
Best Company Size | 10 to 500 employees | — |
Get pricing help | Get pricing help |
Where each option fits best
See where each product is strongest, which teams it fits, and what causes buyers to keep looking — before you commit.
Based on buyer reviews and verified product data collected by Spotsaas.
Key strengths
- Comprehensive Project Management Features: OpenProject offers a wide range of tools, including Gantt charts, task management, time tracking, and agile boards, supporting various project management methodologies.
- Open-Source Flexibility: As an open-source platform, OpenProject allows organizations to customize the software to meet their specific needs, providing flexibility in workflows and integrations.
- Collaborative Tools: The platform includes forums, wikis, and document sharing that help teams collaborate effectively and share knowledge throughout the project lifecycle.
No key benefits available yet.
Best fit
- 10 to 500 employees
- Construction, Engineering, IT Services, Education, Nonprofit Organizations
- Project Managers, Team Leads, Operations Managers, IT Project Coordinators, Construction Managers
No best-fit guidance available yet.
Reasons buyers look elsewhere
- Organizations seeking dedicated customer service and guaranteed uptime may opt for commercial project management solutions that offer 24/7 support and service level agreements.
- Teams relying on a diverse set of tools might prefer platforms that offer a wide range of pre-built integrations with third-party applications to streamline workflows.
- Companies managing large teams and complex projects may look for software that provides advanced resource allocation, forecasting, and utilization tracking capabilities.
No alternatives guidance available yet.
Software Demo
Demo |
|---|
Need a second opinion?
Get shortlist help from a software advisor
Share your priorities, budget, and team needs, and we’ll help you narrow the options and understand the tradeoffs before you talk to vendors.
- Independent advice — matched to your business
- Understand the tradeoffs before you talk to vendors
- Free 15-min call with a software advisor.
Step 1 of 4
How big is your team?
We tailor recommendations to companies your size.
How do OpenProject and Mattermost Compare on Features?
Total Features | 22 Features | 8 Features |
|---|---|---|
Unique Features | No unique features | No unique features |
Get Quote | Get Quote |
Compare OpenProject and Mattermost on pricing
Review starting price, plan structure, and free-trial access side by side so you can see which option fits your budget and buying process.
Pricing Option | ||
|---|---|---|
Starting From |
|
|
Pricing Plans |
|
|
Pricing Page |  |  |
Other Details
Organization Types supported |
|
|
|---|---|---|
Platforms Supported |
|
|
Modes of support |
|
|
API Support |
|
|
Get help choosing | Get help choosing |
Security & Compliance
Certifications, data handling, and security controls for IT and compliance evaluators.
HIPAA | ✗ No | ✗ No |
|---|---|---|
Data Residency | 🌐 Global | 🌐 Global |
OpenProject User Reviews & Rating Comparison
User Ratings | ||
|---|---|---|
Rating Distribution | ||
Spotsaas Editor’s POV generated by AI | Buyer sentiment Buyer sentiment is mixed to positive across 17 reviews, with clear strengths and a few common watchouts. What buyers like
Common complaints
| Buyer sentiment Buyer sentiment is very strong across 34 reviews, with consistently positive feedback. What buyers like
Common complaints
|
Pros and Cons |
|
|
Positive Reviews | No reviews available for the product | No reviews available for the product |
| Negative Reviews | No reviews available for the product | No reviews available for the product |
List of Customers
Customers |  Bahn  Suelzle Kopf  Nokia |  Samsung  SAP  Commonwealth Bank |
|---|
Media and Screenshots
Screenshots |  5 Screenshots |  4 Screenshots |
|---|---|---|
Videos |  3 Videos |  4 Videos |
Top Alternatives to OpenProject and Mattermost in 2026
Alternatives |
|---|
Add another option to compare side by side
Search by product name to compare pricing, fit, and buyer feedback in one view.Compare similar software options
Related Blogs and Articles for Business Instant Messaging Software
Disclaimer: This research has been collated from a variety of authoritative sources. We welcome your feedback at [email protected].
Frequently asked questions
- Which is better, OpenProject or Mattermost?
- Mattermost edges out the other on user ratings (4.8 vs 3.7). That said, the best pick depends on your use case — use the comparison tables above to evaluate each dimension.
- Do OpenProject and Mattermost offer a free trial?
- Yes, both OpenProject and Mattermost offer a free trial.
- What is the starting price of OpenProject vs Mattermost?
- OpenProject starts at Contact for pricing. Mattermost starts at $3.25 /User/Month.
- What are the top alternatives to OpenProject?
- Top alternatives to OpenProject include Quickbase, Smartsheet, ClickUp, Freshbooks, Jira.
- What are the top alternatives to Mattermost?
- Top alternatives to Mattermost include mi.team, Rocket.Chat, Glip, Zulip, Output Messenger.