📖 The AI Tool Bible

Izlo vs Vellum

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

 
Izlo
Agents
Vellum
Agents
TaglinePrompt management platform with version control, collaboration, and an API for production deployment.Personal AI assistant with persistent memory across email, calendar, and chat channels.
CategoryAgentsAgents
PricingPaid· Solo $20/mo; Pro $25/user/mo; Enterprise $39/user/moFreemium· Free tier + API costs; paid plans available
ModelModel-agnosticMulti-model (Claude-class LLMs)
Editorial score6.9 / 108.2 / 10
Use cases
prompt-managementversion-controlteam-collaborationprompt-testingproduction-deployment
personal assistantemail triagecalendar managementmeeting prepresearchtask automation
Pros
  • Git-style version history and activity log for every prompt change
  • Remix sandbox isolates experiments from production prompts
  • REST API lets you swap prompts without redeploying the app
  • Built for multi-user team editing, not just solo developers
  • Persistent multi-type memory across sessions
  • Works across Mac, Web, iOS, Slack, Telegram, phone, CLI
  • Managed OAuth into Gmail, Calendar, Slack
  • Open-source with self-host option
  • Fast onboarding (sub-30-second setup)
Cons
  • No free tier; cheapest plan is $20/mo
  • Stingy token allowance (5K/seat) for in-app testing
  • Lighter on observability/analytics than Langfuse or Helicone
  • Supported model providers not clearly listed on the site
  • Requires broad access to inbox and calendar
  • Pricing tiers not publicly itemized
  • Young product in a crowded assistant space
  • Relies on third-party LLM costs on top of plan
Websitegetizlo.comvellum.ai
Pick Izlo if
  • ✅ Git-style version history and activity log for every prompt change
  • ✅ Remix sandbox isolates experiments from production prompts
  • ✅ REST API lets you swap prompts without redeploying the app
  • ✅ Built for multi-user team editing, not just solo developers
Pick Vellum if
  • ✅ Persistent multi-type memory across sessions
  • ✅ Works across Mac, Web, iOS, Slack, Telegram, phone, CLI
  • ✅ Managed OAuth into Gmail, Calendar, Slack
  • ✅ Open-source with self-host option
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