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Logic vs Vellum

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Cheaper paid plan
Vellum — $30/mo vs $49/mo for Logic
Free plan
Both have one
Public API
Both have one
Higher Trust score
Logic — 87 vs 76 for Vellum
Best fit
Logic: Engineering teams shipping internal AI agents without building infra · Vellum: Individuals who want one assistant with memory across email, calendar and chat

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

LogicTurns a written spec into a deployed AI agent you call as a REST API, with model routing and execution logs built in.VellumPersonal AI assistant with persistent memory that acts across email, calendar, files and chat apps

Side by side

FactLogicVellum
CategoryAgent Frameworks & OrchestrationPersonal AI Assistants
Pricing modelFreemiumFreemium
Starts at$49/mo$30/mo
Public APIYesYes
Trust score87 / 10076 / 100
PlatformsWeb, APIWeb, macOS, iOS, Slack app
CompanyLogic, Inc.—
Launched2024—
Last verifiedOct 15, 2026Oct 16, 2026

What our research says

Logic

Logic replaces custom agent infrastructure with a spec you write once and deploy as an API, which suits teams that don't want to run their own orchestration layer. The tradeoff is that agent logic lives inside Logic's own spec format and hosting, so leaving means rebuilding the deployment layer elsewhere.

Pros

  • Deploys an agent as a typed REST API without separate infra work
  • Routes requests across multiple model providers instead of one
  • Logs every execution for debugging and audits
  • States SOC 2 Type II and HIPAA coverage

Cons

  • Pricing detail beyond the four listed tiers isn't published
  • Agent logic is locked into Logic's own spec format
  • Free tier limits aren't disclosed on the marketing pages

Vellum

An ambitious personal agent that pairs deep memory with real tool access, and the MIT-licensed runtime is a rare escape hatch in this category. The company is visibly mid-pivot - its docs subdomain still describes the earlier enterprise LLM platform - so expect product churn and check that plan credits cover your actual usage.

Pros

  • Persistent memory plus real actions, not just chat
  • Open-source MIT runtime allows self-hosting without platform fees
  • Wide surface: web, macOS, iOS, CLI, Slack, Telegram
  • Transparent hosted pricing with defined compute and credit bundles

Cons

  • Brand confusion: documentation and older coverage describe a different enterprise product
  • Usage credits on top of the subscription make heavy use costlier than the sticker price
  • Company details for the current product are thin on the site

Which one fits

Choose Logic if you need

  • Engineering teams shipping internal AI agents without building infra
  • Companies that need SOC 2 / HIPAA-covered agent hosting
  • Teams that want one API across multiple model providers

Choose Vellum if you need

  • Individuals who want one assistant with memory across email, calendar and chat
  • Tinkerers willing to self-host an open-source assistant runtime
  • Mac-centric users who want a native app plus mobile and Slack access

Logic vs Vellum: the questions people ask

Is Logic cheaper than Vellum?

On published entry prices, Vellum starts lower — $30/mo against $49/mo for Logic. Entry price is the lowest paid plan as we last verified it; what each plan includes differs.

Does Logic or Vellum have a free tier?

Both: Logic has a free tier, and Vellum has a free tier.

Which has a public API, Logic or Vellum?

Both ship a public API, so either can be built on; the fact table above shows the platforms each one runs on.

More comparisons

All Logic alternatives →All Vellum alternatives →Browse all Agent Frameworks & Orchestration →