Alternatives · AI Agents
Stack AI alternatives
As of Nov 12, 2026, the highest-graded Stack AI alternative is Vellum (2.6 GPA). It's also the best free one.
Stack AI compared with 6 alternatives: Relevance AI, Gumloop, Vellum, Dify, Lindy and 1 more.
Stack AI has a free plan. 3 of the 6 alternatives are free or have a free plan. 2 more offer a free trial.
Listings checked up to Nov 12, 2026 · Where the facts come from
Black Friday: is there a Stack AI sale?
At a glance
| Tool | Price | Free plan | Runs on |
|---|---|---|---|
| Stack AIThis tool | Free plan | Yes | Web, Browser extension |
| Relevance AI | From $19/mo | No | Web, iOS, Android, Browser extension |
| Gumloop | Free trial · from $37/mo | Trial only | Web |
| Vellum | Free plan · from $30/mo | Yes | Web, macOS, Windows, iOS, Android, Browser extension |
| Dify | Free plan · from $590/yr | Yes | Web |
| Lindy | Free trial · from $29.99/mo | Trial only | Web, Browser extension |
| Lyzr | Free plan | Yes | Web |
How each one differs from Stack AI
Relevance AI
Low-code platform for building AI agents and multi-agent teams
- Relevance AI starts at $19 per month, billed annually (Pro).
- Relevance AI has no free plan, unlike Stack AI.
- Relevance AI also lists iOS and Android apps.
- Relevance AI also covers chat assistant and no-code.
Suits: Sales and support teams automating research, outreach and CRM updates
Gumloop
AI agent builder for teams, with unlimited seats on shared credits
- Gumloop starts at $37 per month (Pro, including 20,000 credits).
- Gumloop has no free plan, only a free trial, unlike Stack AI.
- Gumloop lists no browser extension, which Stack AI has.
- Gumloop also covers no-code.
Suits: Teams that want non-engineers to build their own agents
Vellum
Personal AI assistant with long-term memory that acts across apps
- Vellum starts at $30 per month (Mighty).
- Vellum also lists macOS, Windows, iOS and Android apps.
- Vellum is open source and self-hostable, according to its own site.
- Vellum also covers chat assistant.
Suits: People who want one assistant that remembers them across devices and chat apps
Dify
Open-source platform for building AI agents and agentic workflows
- Dify starts at $590 per workspace / year (Professional); $59 billed monthly.
- Dify lists no browser extension, which Stack AI has.
- Dify is open source and self-hostable, according to its own site.
- Dify also covers no-code.
Suits: Teams building retrieval-backed agents and chatbots on their own data
Lindy
AI teammate for Slack that works across your team's tools
- Lindy starts at $29.99 per user / month, for 3,000 credits.
- Lindy has no free plan, only a free trial, unlike Stack AI.
- Lindy also covers meeting notes, chat assistant and inbox filtering.
Suits: Teams that work in Slack and want one shared AI teammate
Lyzr
Enterprise agent platform with a free builder and custom plans
- Lyzr lists no browser extension, which Stack AI has.
- Lyzr is self-hostable, according to its own site.
- Lyzr also covers no-code.
Suits: Developers and analysts who want to build agents without paying up front
Limits worth knowing in Stack AI
- Only a Free plan and a custom Enterprise plan are listed; there is no published self-serve paid tier.
- The free plan has 1 seat, 2 projects and 500 runs a month.
- SSO, access control, VPC, on-prem and BAA are Enterprise features.
- Its homepage says Asana acquires StackAI, so plans and ownership may change.
Common questions
What are the alternatives to Stack AI?
The alternatives to Stack AI in this directory are Relevance AI, Gumloop, Vellum, Dify, Lindy and Lyzr. Each one has a side-by-side comparison with Stack AI.
Is there a free alternative to Stack AI?
Yes. Vellum, Dify and Lyzr have a free plan alongside paid ones.
Which Stack AI alternatives work on Windows?
The Stack AI listing does not include a Windows app. Vellum lists one.
Which Stack AI alternatives work on macOS?
The Stack AI listing does not include a macOS app. Vellum lists one.
Is there an open-source alternative to Stack AI?
Vellum and Dify are described as open source on their own sites.
When were these prices checked?
Each listing shows its own date. On this page they run from Oct 5, 2026 to Nov 12, 2026. Vendors change prices without notice, so confirm on their site before you buy.