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AI · head to head

Aider vs Vellum

A

Aider

AI

AI pair programming in your terminal

From
Free
Rated
-
Full reviewWebsite
Vellum logo

Vellum

AI

Personalized AI assistant with persistent memory and autonomous action-taking

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Aider requires comfort working in a terminal rather than a graphical IDE; Vellum pricing varies significantly by computational tier, making budget planning difficult
  • They diverge on capability: Aider covers Multi-LLM support, Vellum covers Persistent AI identity.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Aider and Vellum actually diverge.

Attributes where Aider and Vellum differ
AttributeAiderVellum
Pricing modelopen-sourceFreemium with paid plans and pay-as-you-go credits
Platformsmac, linux, windows, apiWeb, macOS, iOS, Slack, Telegram, Terminal
Founded2023Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (AI).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Aider

  • Multi-LLM support
  • Repository mapping
  • Git integration
  • Voice-to-code
  • Lint and test automation
  • Image and web context
  • Free provider access
  • Editor file-watching

Only in Vellum

  • Persistent AI identity
  • Long-term memory
  • Email automation
  • Calendar management
  • Autonomous task execution
  • Multi-device synchronization
  • Custom plugins
  • Open-source deployment

What people use each for

The jobs each tool is most often brought in to do.

Aider

  • Editing an existing codebase from the terminalnot Vellum
  • Pairing with an LLM on a new projectnot Vellum
  • Automating git-committed code changesnot Vellum
  • Working across many programming languagesnot Vellum
  • Bringing your own LLM API key to a coding workflownot Vellum

Vellum

  • Personal productivity automation across email and calendarnot Aider
  • CRM updates and pipeline managementnot Aider
  • Expense report generation and managementnot Aider
  • Document drafting and content creationnot Aider
  • Meeting scheduling and calendar coordinationnot Aider

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Aider

  • Requires comfort working in a terminal rather than a graphical IDE
  • Has no hosted or managed version, so users must supply and pay for their own LLM API access separately
  • Depends heavily on the chosen underlying model's quality, so results vary by which LLM is configured
  • Lacks a built-in autonomous multi-step task runner comparable to agent-style products

Vellum

  • Pricing varies significantly by computational tier, making budget planning difficult
  • Requires explicit permission for sensitive actions, limiting autonomy
  • Self-hosting option may intimidate non-technical users
  • Learning curve to develop customizations with plugins

Pricing, plan by plan

Aider

Free

No published plan breakdown. See the Aider review.

Vellum

Free
  • FreeFree
    • Starter credits included
    • Basic features
  • Mighty$30/month
    • 1 vCPU, 2 GiB RAM
    • 10 GB storage
    • Included usage allowance
  • Super$100/month
    • 2.5 vCPU, 5 GiB RAM
    • 30 GB storage
    • Assistant email and subdomain
  • Ultra$200/month
    • 4 vCPU, 8 GiB RAM
    • 60 GB storage
    • Assistant email and subdomain

Which should you pick?

Choose Aider if

  • You need multi-llm support.
  • You want to start without paying.
  • You work on mac, linux, windows, api.
  • You also want repository mapping.
Aider review

Choose Vellum if

  • You need persistent ai identity.
  • You want to start without paying.
  • You work on Web, macOS, iOS, Slack, Telegram, Terminal.
  • You also want long-term memory.
Vellum review

Questions people ask

Is Aider or Vellum better?
Neither clearly leads. Aider starts at Free and Vellum at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Aider or Vellum?
Aider starts at Free and Vellum at Free.
Does Aider or Vellum run on more platforms?
Aider runs on mac, linux, windows, api. Vellum runs on Web, macOS, iOS, Slack, Telegram, Terminal.
Can I use Aider for free?
Both have a free tier, so you can try either at no cost before committing.
What is Aider best used for?
Aider is most often used for editing an existing codebase from the terminal, pairing with an llm on a new project, automating git-committed code changes, working across many programming languages. Of those, editing an existing codebase from the terminal and pairing with an llm on a new project are not what Vellum is typically brought in for.
What can Aider do that Vellum cannot?
Aider covers Multi-LLM support, Repository mapping, Git integration, Voice-to-code. Vellum covers Persistent AI identity, Long-term memory, Email automation, Calendar management.

Answered from the vendors’ own pages

Aider: Is Aider free to use?

Aider itself is free and open source, released under the Apache 2.0 license. Users must separately supply and pay for API access to the LLM they choose to use with it.

Source
Vellum: How does Vellum protect my data privacy?

Vellum uses permission-based controls requiring explicit approval for sensitive actions. Data is encrypted and the option for self-hosting provides complete data control. Open-source deployment option allows hosting on your own infrastructure.

Source
Aider: Which LLMs can I use with Aider?

Aider connects to OpenAI, Anthropic, Gemini, GROQ, DeepSeek, Ollama, Azure, Cohere, xAI, GitHub Copilot, Vertex AI, Amazon Bedrock, OpenRouter and most other LLM providers via API keys.

Source
Vellum: Can I use Vellum for business team collaboration?

Vellum is primarily designed as a personal assistant with persistent identity. For team collaboration, platforms like Lindy offer better multi-user features with shared credit pools and Slack workspace integration.

Source
Aider: Can I use Aider for free without paying for an LLM API?

Yes, Aider can be used at no cost through OpenRouter's free model access (subject to daily usage limits) or Google's Gemini 2.5 Pro Exp, which the docs note performs well without a paid API key.

Source
Vellum: What does the free tier include?

Vellum offers free starter credits to begin using the platform. Beyond that, it operates on a pay-as-you-go credit model with paid tiers starting at $30/month for increased computational resources and bundled credits.

Source
Aider: How does Aider handle version control?

Aider automatically stages and commits each change it makes to a connected git repository, generating a descriptive commit message for every edit so changes stay reviewable and reversible.

Source
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