The open-source alternative to Viktor
Looking for something like Viktor, but open source and free to start? Alfera is the AI coworker your whole team shares: a company brain that syncs your apps, connections shared per person or per team, permissions on every action, and Slack, WhatsApp and email. Self-host it in one click, or start on Alfera Cloud.
In one line: Alfera is open source with a company brain, vs a closed AI coworker in Slack and Teams.
| ViktorAI coworker in Slack and Microsoft Teams | Open source, or Alfera Cloud | ||
|---|---|---|---|
| What it is | A hosted AI employee in Slack and Microsoft Teams that connects to 3,200+ tools and does work across them. | The AI coworker your whole team shares, with a company brain that syncs your apps. Open source. | |
| Open source | No | Yes, AGPL-3.0 | |
| Self-host | Not published | Yes: one click on DigitalOcean or AWS, or one command on any server | |
| Price | Free start with $100 in credits; paid from $50/month for 20,000 credits. Enterprise is custom pricing. | Free to start: open source to self-host, and Alfera Cloud starts with $10 of free AI usage | |
| Where it works | Slack, Microsoft Teams, Web app, Email | Slack, WhatsApp, email from its own address, the web app, a Mac app, the API and MCP | |
| Team use | One workspace with Admin and Member roles. Teammates @mention Viktor. Each connection is for everyone in the workspace or private (invite only). | Multiplayer: one coworker for the whole team. It knows who is asking, and each connection is shared with everyone, one project, or one person | |
| Permissions | Each tool is Off, Run automatically, or Ask for confirmation. Approval cards with Approve and Reject buttons in Slack, Teams and the web app. | Allow, ask first, or never, per connection and per action. Approvals in Slack, email or the app, and every action logged | |
| Starts on its own | Scheduled tasks, reminders, and event triggers from a connected app, a webhook, or a Slack or Teams conversation. | On a schedule, from a webhook, or on 600+ app events | |
| Models | Anthropic Claude, OpenAI GPT and Google Gemini; you can pick a model per scheduled task. Bring your own key: Not published. | 230+ models: Claude, GPT, Gemini, open models, your ChatGPT plan, or your own |
Where Viktor is the better choice
Teams in Slack or Microsoft Teams that want an AI hire for founders, growth, engineering, ops and finance work.
- 3,200+ tool integrations listed on its site, and it builds custom integrations for tools not in the catalogue
- Works inside Microsoft Teams as well as Slack
- SOC 2 Type 1 certified, with EU data residency available on Enterprise contracts
Everything Alfera does
- A company brain that syncs your apps. Connect Google Drive, Notion, Slack and the rest. Documents sync on their own, keep every version, and every answer draws on them.
- One coworker for the whole team. It knows who is asking. Many people, many tasks at once, each with their own chats and connections, and shared chats when you want.
- 3,000+ app connections, shared the way you choose. Each connection is open to everyone, one project, or one person. A personal mailbox stays personal; the support inbox is the team’s.
- Permissions on every action. Allow, ask first, or never, per connection and per action. Approvals land in Slack, email or the app, and every action is logged.
- Where your team already is. Slack, WhatsApp, email from its own address, the web app, a Mac app, and your own code through the API and MCP.
- It starts work by itself. On a schedule, from a webhook, or on 600+ app events in Gmail, HubSpot, Stripe and more.
- Its own computer. Every chat runs in a sandbox with a terminal and a browser, and its files stay from one chat to the next.
- Any model. 230+ models: Claude, GPT, Gemini, open models, your ChatGPT plan, or a model you run yourself.
- Open source, and free to start. AGPL-3.0. Self-host it in one click on DigitalOcean or AWS, or start on Alfera Cloud with $10 of free AI usage.
Viktor and Alfera
Alfera. Alfera is the AI coworker your whole team shares. It has a company brain that syncs your apps, 3,000+ app connections shared per person or per team, permissions on every action, and it works in Slack, WhatsApp, email and the web app. It starts work by itself, runs on any model, and it is open source: self-host it in one click or start free on Alfera Cloud. Viktor is not open source.
If you want something like Viktor, but open source and free to start, with a company brain that syncs your apps, connections shared per person or per team, and permissions on every action, pick Alfera. It works in Slack, WhatsApp and email, starts work by itself, and runs on any model.
Viktor: Free start with $100 in credits; paid from $50/month for 20,000 credits. Enterprise is custom pricing.. Alfera: Free to start: open source to self-host, and Alfera Cloud starts with $10 of free AI usage.
Viktor: Not published. Alfera: Yes: one click on DigitalOcean or AWS, or one command on any server.
Teams in Slack or Microsoft Teams that want an AI hire for founders, growth, engineering, ops and finance work. 3,200+ tool integrations listed on its site, and it builds custom integrations for tools not in the catalogue. Works inside Microsoft Teams as well as Slack. SOC 2 Type 1 certified, with EU data residency available on Enterprise contracts.
Sources
Facts about Viktor come from its own pages, read on 16 October 2026. Something out of date? Write to hello@alfera.ai and we will fix it.
- home page: positioning, channels, 3,200+ tools, audiences
- pricing page: $100 free credits, $50/month for 20K credits, Enterprise custom
- docs index: channels, scheduled tasks, event triggers, webhooks, reminders
- per-tool permission modes and connection access
- approval cards in Slack, Teams and the web app
- Admin and Member roles, team invites
- SOC 2 Type 1, AWS us-east-1 hosting, EU residency on Enterprise, model providers
- pick any model, per scheduled task
- builds custom integrations for tools not in the catalogue
- site index; no public source repo or self-host page listed