SaaS / business softwareBusiness software & SaaSOriginal by Slack
Slack changed how teams work by moving internal email traffic into topic-based channels. Everyone joins the relevant channel, conversations become a searchable archive and notifications from outside tools land in the same stream. What makes the product strong is its integration ecosystem: thanks to bots, chat becomes the hub where work gets done, and as a team grows, so does its dependence.
Building something similar takes a workspace, channel and thread structure, instant messaging infrastructure and a powerful search engine. On top come webhooks, a bot API, an app directory, a no-code workflow builder, short voice calls and channels shared between companies. For enterprise customers, SSO, data retention, export and audit logs are part of the product too.
How Slack works: the core user flow
How many apps and dashboards do you need?
Desktop, web and mobile clients
The clients where team members chat in channels, share files and interact with apps.
Workspace administration
The panel where admins manage members, channels, permissions and billing.
App and API platform
The developer environment where developers publish bots, slash commands and integrations.
Critical features of a product like Slack
Channels and threads
Public and private channels and threads attached to messages keep crowded teams organised.
Instant full-text search
Messages, files and people are searched with filters in seconds, turning the archive into company memory.
Integration directory
Project management, CI, CRM and support tools connect in one click, and notifications land in the channel.
No-code workflows
Form, approval and reminder flows are built by drag and drop without writing code.
Shared channels
Workspaces of different companies chat securely in a common channel.
Quick voice calls
A fast voice call and screen share start inside a channel, with no need to schedule a meeting.
What goes into the first version, what comes later
First version (MVP)
- Workspace, channels and direct messages
- Threads, reactions and file sharing
- Message and file search
- Webhooks and a basic bot API
- Free and paid plans
Later releases
- App directory and developer portal
- No-code workflow builder
- Voice calls and screen sharing
- Shared channels and enterprise compliance
Modules and how the budget is calculated
The budget is calculated with 360 SOFT’s pricing model from the modules below, about 30 screens and the project’s complexity: roughly 199 person-days for the full scope and 138 person-days for the first version. Every module you drop lowers the budget directly.
| Module | Phase |
|---|---|
| Sign-up, login, social login | First version |
| User profile and settings | First version |
| Roles and permissions | First version |
| Admin dashboard | First version |
| Real-time messaging | First version |
| Push notifications | First version |
| Advanced search and filters | First version |
| File, photo, video upload | First version |
| Third-party API integration | First version |
| GDPR and security hardening | First version |
| Subscriptions and recurring billing | First version |
| Online payments (Stripe / PSP) | First version |
| Video / voice calls | First version |
| AI features (LLM, RAG, recommendations) | Later release |
Hosting, SMS, map APIs, app store accounts and payment-provider fees are separate items. Maintenance and improvements (optional): €650 / month. We send a fixed written price within 24 hours after a free discovery call.
The hard parts
Search at scale
Permission-aware fast search across millions of messages built up over the years calls for a custom indexing architecture.
Real-time consistency
Syncing messages, read state and notifications in the right order on every device is a hard distributed systems problem.
Integration security
If permissions and tokens given to third-party apps are abused, company data can leak, so a fine-grained permission model is a must.
Business model
A freemium per-seat subscription is the best-fit model: a free plan with limited message history and integrations, and paid plans with unlimited archive, calls and workflows. SSO, compliance and data residency are offered at a high price in the enterprise package. Add-ons such as AI summaries and search can be charged separately.
Get a free quote for your project
Let us scope it together and send a fixed written quote within 24 hours. NDA on request; you own the source code.
Choosing a company to build an app like Slack
Most people searching “build software like slack” are really looking for a reliable app development company. When comparing quotes, check four things:
- Can you try similar products they have shipped, in the stores or live?
- Are the source code, design files, servers and store accounts transferred to you by contract?
- Do they show a working demo every two weeks, with written scope and acceptance criteria?
- Are maintenance, scaling and GDPR/security costs written into the quote?
Copyright and trademarks
A business model and features are generally not protected on their own, but the Slack name, logo, interface design, content and source code are. That is why we build a product with similar functionality but your own brand, design and code. This is not legal advice; we recommend a trademark search before launch.
Frequently asked questions
How long does it take to build software like Slack?
A first version with channels, messaging, search and basic integrations can be ready in a few months. The app directory, workflows and enterprise compliance mature in later phases.
Does it make sense to start from open source alternatives?
Projects such as Mattermost or Rocket.Chat can be used as a base within their licence terms. To differentiate, you need to build workflows and integrations tailored to a specific industry.
Will there be copyright or trademark issues?
The team chat business model and its features are generally free to use, but the name, logo, design, sounds and code cannot be copied. This is general information, not legal advice.
What should I look for when choosing a company to build software like Slack?
Ask about real-time messaging, search engine and API platform development experience, and request scale tests and their security approach.
