Internal Research

AI-First Knowledge Base Tools

Comparison of 7 contenders for swarm.ing's team knowledge layer. Evaluated for AI depth, self-hosting, data sovereignty, and engineering leverage.

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Recommendation: AFFiNE (self-hosted) + Obsidian (keep)
AFFiNE gives you the Notion-like collaboration layer with whiteboard integration, local-first CRDT architecture, and self-hosting on Mac Mini — zero SaaS tax. Keep Obsidian for personal graph-based PKM. Both align with the "disk state as source of truth" principle.
01

The 7 Contenders

★ TOP PICK
AFFiNE
Open-source Notion+Miro hybrid — docs, whiteboards, databases in one canvas
Self-HostMIT LicenseAI Built-InLocal-First
AI DepthIntegrated copilot — summarization, generation, mind maps. Multimodal (whiteboard + docs)
Data ModelLocal-first CRDT (y-octo/Yjs), optional cloud sync
Self-HostDocker (Postgres + Redis) — free, no seat limits
PricingFree local · Pro $6.75/mo · Team $10/seat · Self-hosted $0

Strengths

  • Edgeless Mode — any doc becomes infinite whiteboard instantly
  • Self-host on Mac Mini, zero SaaS dependency
  • MIT license — fork, extend, no vendor lock-in
  • CRDT sync works offline, disk state as truth
  • AI built-in, not a paid bolt-on

Weaknesses

  • Thin integration ecosystem (no native Slack/GitHub/GCal)
  • Self-hosted AI requires your own API keys
  • Less polished UI — still has beta edges
  • Small template library vs Notion's massive community
  • Mobile apps still maturing
ReplacesNotion (docs/databases) + Miro (whiteboards) + Google Docs (collab editing)
#2
Notion
The incumbent all-in-one — docs, databases, wikis, project management + AI Agents
Cloud OnlyBest AI Agents$20/user for AI
AI DepthMulti-model agents (GPT-5, Claude Opus 4.1, o3). Custom Agents, Ask Notion queries workspace + Drive/Slack
Data ModelCloud-only, proprietary
Self-HostNo
PricingFree (solo) · Plus $10/user · Business $20/user (AI) · Enterprise custom

Strengths

  • Most mature product, 100M+ users, massive template ecosystem
  • AI Agents execute multi-step workflows autonomously
  • Deep integrations: Slack, Drive, GitHub, Figma, etc.
  • Best collaborative editing experience

Weaknesses

  • AI locked behind $20/user/mo Business plan
  • Cloud-only — zero data sovereignty
  • Sluggish on large workspaces (10k+ pages)
  • Vendor lock-in: mediocre export quality
ReplacesGoogle Docs + Trello + Confluence + Airtable (partially)
KEEP
Obsidian
Local-first markdown PKM — graph view, 1800+ plugins, ultimate portability
Local FilesPlugins for AIFree
AI DepthVia plugins only (Smart Connections, Copilot). No native AI
Data ModelPlain markdown files on local disk
Self-HostN/A — already local. Sync via Dropbox/Git
PricingFree · Sync $4/mo · Publish $8/mo

Strengths

  • Already in use — vault, Bases, CLAUDE.md integration
  • Plain markdown = ultimate future-proofing
  • 1800+ plugins, unmatched ecosystem
  • Graph view for discovering connections

Weaknesses

  • Team collaboration is fragile at best
  • No native databases (Bases is limited)
  • No whiteboard (Canvas is basic)
  • Not suitable as team wiki or shared KB
RolePersonal PKM, research journals — keep alongside AFFiNE
#4
Tana
AI-native outliner — Supertags turn text into structured, queryable data
Deep AICloud OnlyBeta
AI DepthVoice memos → auto-transcribe/tag/route. Meeting agents, AI search, auto-org
Data ModelCloud-based proprietary graph
Self-HostNo
PricingFree beta · Paid from ~$2/mo (evolving)

Strengths

  • Best-in-class AI voice memos pipeline
  • Supertag system is genuinely novel
  • Daily notes + structured data coexist naturally

Weaknesses

  • Steep learning curve — weekend of tutorials
  • JSON-only export — poor portability
  • Cloud-only, no offline, no self-hosting
  • English-only, mobile is limited
ReplacesRoam Research + task management + meeting notes pipeline
#5
AppFlowy
Open-source Notion clone in Rust+Flutter — self-hostable, local-first
Self-HostAGPLBasic AI
AI DepthBasic writing assist. Connects local Ollama (Llama 3, Mistral)
Data ModelLocal-first, optional cloud sync
Self-HostDocker — free, Ollama for private AI
PricingFree local · Pro $10-12.50/mo (cloud + AI)

Strengths

  • Closest Notion UX clone — minimal learning curve
  • Rust + Flutter = genuinely fast
  • Notion one-click importer works

Weaknesses

  • AI is basic compared to AFFiNE or Notion
  • No whiteboard/canvas mode
  • Fewer block types and views
ReplacesNotion (for teams wanting self-hosted Notion-like UX without the cost)
#6
Anytype
Privacy-first object-based PKM — E2E encrypted, P2P sync, no central server
E2E EncryptedP2PMinimal AI
AI DepthMinimal — OpenAI for writing/translation. AI is not the focus
Data ModelLocal-first, encrypted P2P sync (Any-Sync protocol)
Self-HostSelf-sovereign by design — data on device, P2P
PricingFree (100MB remote) · Plus $5/mo (1GB)

Strengths

  • Best-in-class privacy: E2E, passphrase-only, P2P
  • Gorgeous UI — one of the best-looking OSS tools
  • Powerful object-based data model

Weaknesses

  • AI is an afterthought — not AI-first at all
  • Steep learning curve (objects, types, relations)
  • Lose passphrase = lose data, no recovery
ReplacesNotion for privacy-obsessed users + personal CRM/PKM
#7
Heptabase
Visual knowledge base — infinite whiteboards with card-based notes + AI research
Research AI$18/mo fullNo Databases
AI DepthResearch AI with citations (OpenAI, Gemini, Anthropic). Source explanation
Data ModelLocal storage + optional cloud sync
Self-HostNo
PricingPro $8.99/mo · Premium $17.99/mo (unlimited AI + OCR)

Strengths

  • Best spatial/visual knowledge mapping
  • AI research assistant with verifiable citations
  • 10k+ notes searchable in <1 second

Weaknesses

  • No databases, no kanban, no project mgmt
  • $18/mo for full AI — pricey for the scope
  • No API, very limited integrations
ReplacesMiro for research + paper management (optional, niche use)
02

Head-to-Head Matrix

FeatureAFFiNENotionObsidianTanaAppFlowyAnytypeHeptabase
AI Native✓ Built-in✓ Multi-modelPlugins✓ DeepBasicMinimal✓ Research
Self-Host✓ Docker✗N/A (local)✗✓ Docker✓ P2P✗
Local-First✓ CRDTCloud-only✓ FilesCloud✓✓ E2EPartial
Open Source✓ MIT✗✗✗✓ AGPL✓✗
Whiteboard✓ Edgeless✗Canvas✗✗✗✓ Core
Databases✓✓ BestBasesSupertags✓Sets✗
Team Collab✓ Real-time✓ Best✗⚠✓Early✓ Free
IntegrationsFew✓ Best✓ PluginsFewFewMinimalFew
Cost (5-person)$0 self-host$100+/mo$20/mo syncTBD$0 self-host$25/mo$90/mo
03

What Replaces What

Obsidian (personal PKM)Keep ObsidianNothing beats it for personal graph-based PKM with your existing vault, skills, and CLAUDE.md integration
Scattered Google Docs→ AFFiNETeam docs + whiteboards + databases in one place, self-hosted on Mac Mini
Notion (if using)→ AFFiNESame capability class, but open-source, self-hostable, no $20/user AI tax
Miro / FigJam→ AFFiNE EdgelessWhiteboards integrated directly into docs, not a separate tool
Confluence (wiki)→ AFFiNESelf-hostable, free, better whiteboard than Confluence ever had
Meeting notesKeep GranolaAlready works. Tana's voice pipeline is best-in-class but not worth switching for
Research / deep workHeptabase (optional)Only if spatial visual mapping becomes critical. Otherwise Obsidian suffices