Compare Mattermost and One Time Secret on pricing, features, platforms, and ratings — both Team Chat tools, Freemium pricing to decide which fits your team.
At a Glance
Mattermost
One Time Secret
Primary category
Team Chat
Team Chat
Rating
Not documented
Not documented
Pricing model
Freemium
Freemium
Starting price
Free (Starter, self-hosted); Professional from $10/user/month
Free
Free plan
Yes
Yes
Free trial
Not documented
Not documented
Platforms
Web, iOS, Android, Mac, Windows
Web
Team collaboration
Not documented
Not documented
AI features
Not documented
Not documented
Public API
Not documented
Yes
Pricing Compared
Starting price reflects the lowest paid tier, not the full cost for every team size or usage level.
Mattermost
Starter — Free N/A
Professional — $10/user/month annual
Enterprise — Custom annual
One Time Secret
Basic — Free N/A
Identity Plus — 35 EUR/month Monthly
Pros & Cons
Mattermost
Pros
Fully open-source core with self-hosted and air-gapped deployment options
Strong fit for regulated industries, government and defense customers
Playbooks provide built-in workflow automation not native to Slack
Deep integrations with developer and DevOps tooling
Lightweight architecture (single Go binary) makes self-hosting comparatively simple
Cons
Smaller app/integration marketplace than Slack or Microsoft Teams
Enterprise pricing is custom-quoted and not publicly transparent
Self-hosting requires ongoing server maintenance and updates
UI and mobile experience is generally considered less polished than Slack
Annual prepaid billing only for official Professional and Enterprise licenses, no monthly option
One Time Secret
Pros
Free plan is fully functional, including a custom domain and REST API access
Open source with the option to self-host for full data control
Over a decade of continuous operating history since 2011
Simple, no-friction experience: no account required to view a shared secret
Straightforward, transparent paid tier at a flat monthly price
Cons
Encryption is server-side, not fully zero-knowledge, so the operator's server briefly handles plaintext
Free plan expiration is capped at 14 days
Custom branding and unlimited domains require the paid Identity Plus tier
Built for short text secrets, not designed for sharing large files
No native mobile apps; it is a web-based tool only
Use Cases
Mattermost
Incident response and DevOps workflows — Engineering teams use Playbooks to coordinate incident response with automated checklists and dedicated channels.
Regulated and government communication — Public-sector and financial-services organizations need self-hosted or air-gapped messaging to meet compliance requirements.
Secure internal team chat — Organizations that want Slack-like messaging while keeping full control of where data is stored.
One Time Secret
Sharing credentials with teammates or IT support — Send passwords or access credentials internally without leaving them in permanent chat or email history.
Sending API keys or database passwords to clients — Developers and agencies share one-off credentials with clients or contractors via a link that disappears after use.
One-off sharing of sensitive personal information — Individuals send private information such as account numbers or personal details securely to another person.