# Vellum vs Viktor > Personal AI assistant vs AI employee platform > Last updated: June 16, 2026 > Comparison: https://www.vellum.ai/compare-assistants/vellum-vs-viktor ## Overview Vellum is a personal AI assistant that runs as a native Mac app on your machine or in Vellum Cloud, with iOS, web app, voice, email, Telegram, Slack, and Microsoft Teams surfaces that share one memory. Viktor is a cloud-based AI employee platform built by Zeta Labs that runs inside Slack and Microsoft Teams, designed for team-level task execution across business workflows. ## The contenders ### Vellum Website: https://vellum.ai Vellum is a personal AI assistant that runs as a native Mac app on your own machine or in Vellum Cloud, with iOS, web, Slack, and Telegram surfaces in sync across both. It builds a persistent, structured memory of your work and people automatically, and executes real actions across 50+ services through managed OAuth. Why choose Vellum: - Runs as a native Mac app on your own machine or in Vellum Cloud, with iOS, web, Slack, and Telegram surfaces in sync across both - Persistent, structured memory that builds itself as you go, with no uploading, tagging, or training required - One-click managed OAuth across 50+ services like Google, Slack, Notion, GitHub, and Linear, executing real actions on your behalf - Free Base plan, with Pro from $50/mo for pay-as-you-go credits, configurable compute and storage, and your assistant's own email and subdomain ### Viktor Website: https://viktor.com Viktor is a cloud-based AI employee platform from Zeta Labs that operates inside Slack and Microsoft Teams. It connects to 3,200+ business tools and executes tasks at a team or workspace level. Why choose Viktor: - Lives inside Slack and Teams, so no new app to install for existing Slack-heavy teams - 3,200+ tool integrations covering a wide range of business workflows - Free tier with $100 in credits and no credit card required - Designed for team-level task delegation, not just individual use ## The scorecard ### channels Vellum: 7 native surfaces, one memory iOS, native Mac app, web app, voice, email, Telegram, Slack, and Microsoft Teams. Every surface shares one memory. Vellum runs natively on Mac, iOS, web app, voice, email, Telegram, Slack, and Microsoft Teams. Every surface shares the same memory and thread history, so you can start a task on your Mac and pick it up on your phone or in a chat. Viktor: Slack and Teams only Viktor lives inside Slack and Microsoft Teams. No native Mac app, iOS app, web app, voice, or email surface. Viktor is available exclusively inside Slack and Microsoft Teams. There is no native Mac app, iOS app, web app, voice interface, or email surface. Reaching Viktor outside of those two platforms is not possible. ### hosting Vellum: On-device, managed cloud, or self-hosted Run on-device as a native Mac app, on Vellum's managed cloud, or self-host on your own VPS. Vellum gives you the full range: run the native Mac app entirely on your own hardware, use Vellum Cloud for managed uptime and cross-device sync, or self-host on your own VPS for full infrastructure control. Viktor: Cloud-only, hosted by Viktor Viktor is fully cloud-hosted with no on-device or self-host option. Viktor runs exclusively on Viktor's cloud infrastructure. There is no on-device runtime, no self-host path, and no option to run it on your own VPS or hardware. ### integrations Vellum: 50+ managed OAuth integrations Native agent skills plus 1-click integrations with 50+ services through managed OAuth. Vellum connects to 50+ services through managed OAuth: Google, Slack, Notion, GitHub, Linear, and more. Your assistant acts in real services on your behalf without you handling tokens or API keys. Viktor: 3,200+ business tool integrations Viktor connects to 3,200+ tools, primarily business and team software, through its Slack and Teams interface. Viktor offers a wide integration surface of 3,200+ tools aimed at business workflows. Integrations are accessed through the Slack or Teams interface. The breadth is notable for team use cases but is tied to those two platforms. ### memory Vellum: Persistent, structured personal memory Builds a persistent, structured memory of your work and people that gets sharper with every conversation and correction. Vellum builds a structured memory graph of your projects, people, and preferences across every surface. It compounds over time through use and explicit corrections, so each conversation picks up where the last left off. Viktor: Workspace-scoped thread context Context is scoped to Slack threads and workspace history, not to you personally. Viktor retains context within Slack or Teams threads and can reference workspace history. Memory is shared across the workspace rather than personal to each user, and does not persist or compound at the individual level. ### modularity Vellum: Adapts to you personally Builds its own skills, learns your tone, and adapts based on what you reward and correct. Vellum adapts at the individual level: it learns your communication style, builds custom skills from your instructions, and updates its behavior based on your feedback. Each assistant is shaped by the specific person using it. Viktor: Team-level task configuration Configured at the workspace level for team workflows, not tuned to individual users. Viktor is configured at the Slack or Teams workspace level to support shared team workflows. It does not build a personal model of each individual user's preferences, tone, or working style. ### open-source Vellum: Open source under MIT Open source under MIT license. Full codebase available on GitHub. Vellum is open source under the MIT license. The full codebase is on GitHub and can be self-hosted, audited, and extended. Viktor: Closed source, proprietary Viktor is a closed-source proprietary platform. No public codebase or self-host option. Viktor is a closed-source commercial product. There is no public repository, no self-host path, and no ability to audit or extend the codebase. ### pricing Vellum: Free Base, Pro from $50/mo Free Base with 10 free credits + referral credits. Pro from $50/mo with configurable compute, storage, and assistant email. Vellum offers a free Base plan with 10 credits and a referral credit system. Pro starts at $50/mo and comes with configurable compute, configurable storage, and a personal assistant email and subdomain. Viktor: Free with $100 credits, from $50/mo Free tier includes $100 in credits with no credit card required. Paid plans start at $50/mo. Viktor offers a free entry tier with $100 in credits and no credit card required. Paid plans start at $50/mo. Pricing scales with usage across the workspace, and costs can compound quickly for teams running Viktor at volume. ### privacy Vellum: Local or cloud, always yours Run locally on Mac, in Vellum Cloud, or self-host. Vellum never has access to your data on any deployment path. Vellum gives you three deployment paths: native Mac app on your own hardware, Vellum Cloud with per-customer isolation, or self-hosted on your own infrastructure. On every path, Vellum never has access to your data. Viktor: Cloud-only, shared workspace context All conversations run through Viktor's cloud. No self-host option. Workspace context is shared among team members. Viktor is cloud-only with no self-hosted deployment path. Conversations and task history flow through Viktor's infrastructure. Workspace context is shared across team members by design, so individual conversations are not private from colleagues. ### schedules Vellum: Built-in scheduling, always running Built-in scheduling for daily briefings, weekly reports, and hourly checks that just run on a cadence. Vellum has native scheduling for recurring tasks: daily briefings, weekly reports, hourly checks. Scheduled tasks run in the cloud whether or not you have a session open. Viktor: Slack-based task scheduling Viktor can execute scheduled tasks inside Slack. Scheduling is tied to the Slack workspace context. Viktor supports scheduled and background task execution within Slack. Recurring jobs run through the Slack interface, so scheduling capabilities are limited to what can be surfaced inside that platform. ### security Vellum: Isolated credential vault Credentials live in an isolated vault and never enter the language model, so prompt injection can't exfiltrate keys. Vellum stores every connected service credential in an isolated vault that never touches the LLM inference layer. Prompt injection attacks cannot reach your API keys or OAuth tokens. Viktor: Platform-managed credentials Viktor manages tool credentials through its platform. No public documentation on vault isolation or prompt injection protections. Viktor handles credentials for its 3,200+ integrations through its own platform. Detailed public documentation on credential isolation, vault architecture, or prompt injection protection is not available on their public-facing materials. ### setup Vellum: Up in 5 to 10 minutes Up and running in 5 to 10 minutes: Web app and/or download the Mac app, sign in, connect your tools. No terminal needed. Vellum setup takes 5 to 10 minutes: use the Web app and/or download the Mac app, create an account, and connect your tools via one-click OAuth. No terminal, no config files, no infrastructure to provision. Viktor: Slack or Teams add-on install Add Viktor to your Slack or Teams workspace. Requires workspace admin permissions to install. Viktor is added to an existing Slack or Teams workspace. Installation is quick for admins, but individual users cannot self-serve the setup without workspace admin access. Users outside those platforms have no onboarding path. ### storage Vellum: Storage Vellum Cloud: 3 GB RAM and 4 GB storage by default. Mac app runs on standard Mac hardware. ## Where they split ### Always on, across every surface Viktor runs in the cloud and executes background tasks inside Slack or Teams. If you are outside those platforms, Viktor is unreachable. Vellum can run in the cloud and is reachable from your Mac app, iPhone, web app, voice, email, Telegram, Slack, or Microsoft Teams at any time. Background loops and scheduled tasks keep running whether or not you have a session open. ### Your assistant, wherever you are Viktor lives inside Slack and Microsoft Teams. There is no native Mac app, iOS app, web app, voice, or email surface. If you step outside those two platforms, your assistant is not with you. Vellum meets you on every surface: native Mac app, iOS, web app, voice, email, Telegram, Slack, and Microsoft Teams. Every surface is reachable at any time, and Vellum runs in the cloud so background loops keep going whether or not you have a session open. Every surface shares one memory, so context from your morning Mac session is there when you pick up your phone or send an email. ### Memory that knows you, not just your team Viktor holds context at the workspace level, shared across your team. There is no individual memory that builds over time or adapts to how you personally work. Vellum builds a structured memory graph personal to you: your projects, preferences, relationships, and working patterns. It compounds with every session and correction, so your assistant gets more accurate and more useful the longer you use it. ### Your data stays yours, on any deployment path Viktor is cloud-only with no self-host option. Conversations and task history are stored on Viktor's infrastructure, and workspace context is shared among team members by design. Vellum offers three paths: native Mac app on your own hardware, Vellum Cloud with per-customer isolation, or self-hosted on your own VPS. On every path, Vellum never has access to your data. Self-hosting Vellum gives you full infrastructure control without giving up any capability. ## Lingering questions ### When should I choose Vellum over Viktor? Choose Vellum if you want a personal AI that knows you, works across your Mac, iPhone, email, and Slack, and builds memory that compounds over time. Vellum is built for individuals who want a capable assistant that persists across every surface they use, not just inside a team chat tool. ### When does Viktor make more sense than Vellum? Viktor has an advantage if your team is already deep in Slack or Microsoft Teams and you want to automate team-level workflows without installing a new app. Its 3,200+ business tool integrations and workspace-level design make it a reasonable fit for shared task delegation in Slack-centric organizations. ### How does Viktor pricing compare to Vellum? Both start at $50/mo on paid plans. Viktor offers a free tier with $100 in credits and no credit card required. Vellum offers a free Base plan with 10 credits and referral credits. Viktor's pricing scales across a shared workspace, so team usage can compound costs quickly. Vellum's Pro plan gives each individual configurable compute and storage with a personal assistant email and subdomain. ### How hard is it to set up Viktor compared to Vellum? Viktor is added to an existing Slack or Teams workspace, which is quick if you have admin access. Vellum setup takes 5 to 10 minutes: download the Mac app or start on Web, sign in, and connect your tools via one-click OAuth. Neither requires a terminal or config files. The key difference is that Viktor requires workspace admin permissions, while any individual can set up Vellum independently. ### Does Viktor remember things between conversations? Viktor retains context within Slack or Teams threads and can reference workspace history, but this context is shared across your team rather than personal to you. It does not build a structured, individual memory that compounds over time. Vellum builds a personal memory graph that persists across all surfaces and grows more useful with each session. ### What services can Viktor connect to vs Vellum? Viktor advertises 3,200+ tool integrations focused on business and team software, all accessed through Slack or Teams. Vellum connects to 50+ services through managed OAuth, including Google, Notion, GitHub, Linear, and Slack, and executes real actions in those services on your behalf. Viktor's breadth is wider at the team level; Vellum's integrations require no token management from you. ### Can I use Viktor on my iPhone or Mac outside of Slack? Viktor does not have a native iPhone app, Mac app, web app, or voice interface like Vellum does. It works exclusively inside Slack and Microsoft Teams. If you need your assistant outside of a team chat tool, Viktor is not an option. ### Who holds my data when I use Viktor? Viktor is a cloud-only platform with no self-host option. Your conversations, task history, and workspace context are processed and stored on Viktor's infrastructure. Workspace context is shared among team members by design, so private conversations within a team workspace are not isolated. Vellum offers a native Mac app that runs on your own hardware, a managed Vellum Cloud option with per-customer isolation, and a self-hosted path. On every deployment path, Vellum never has access to your data. ### Is Viktor open source? Viktor is a closed-source proprietary platform. There is no public codebase, no self-host option, and no way to audit or extend it. Vellum is open source under the MIT license with the full codebase available on GitHub, and supports self-hosting for teams that want full infrastructure control. ### Can I use Viktor and Vellum at the same time? Yes. Viktor operates inside Slack at the team or workspace level, while Vellum serves as your personal assistant across Mac, iOS, voice, email, and more. They target different scopes: Viktor is about delegating team workflows inside a chat platform, Vellum is about building a personal assistant that knows you and acts on your behalf across your entire digital life. Many users could reasonably use both without conflict, and even have both agents communicate to each other. ### Is Viktor good for individual users or is it built for teams? Viktor is designed around the team and workspace context inside Slack or Microsoft Teams. Its memory model, pricing, and integration surface are all oriented toward shared team workflows rather than individual use. If you want an AI that knows you personally, adapts to your preferences, and works across your tools and devices, Vellum is the better fit. --- Full comparison index: https://www.vellum.ai/compare-assistants Try Vellum: https://www.vellum.ai