Alternatives · AI Agents
Sintra alternatives
Sintra compared with 6 alternatives: Marblism, Lindy, Viktor, Relevance AI, AutoGPT and 1 more.
Sintra is a paid product, starting at $52 per month on the 12-month plan, before the discount shown on site. 1 of the 6 alternatives is free or has a free plan. 3 more offer a free trial.
6 tools · Listings checked up to Oct 6, 2026 · Where the facts come from
At a glance
| Tool | Price | Free plan | Runs on |
|---|---|---|---|
| SintraThis tool | From $52/mo | No | Web, iOS, Android |
| Marblism | From $24/mo | No | Web |
| Lindy | Free trial · from $29.99/mo | Trial only | Web, Browser extension |
| Viktor | Free trial · from $50/mo | Trial only | Web |
| Relevance AI | From $19/mo | No | Web, iOS, Android, Browser extension |
| AutoGPT | Free plan · from $42.50/mo | Yes | Web |
| Cofounder | Free trial · from $120/mo | Trial only | Web |
How each one differs from Sintra
- From $24/mo
Marblism
Seven prebuilt AI employees for small-business admin and marketing
- Marblism starts at $24 per month on the yearly option. Sintra starts at $52 per month on the 12-month plan, before the discount shown on site.
- Only Sintra lists iOS and Android apps.
- Marblism also covers meeting notes and inbox filtering.
- Sintra also covers chat assistant and workflow automation.
Suits: Solo founders and small businesses without admin or marketing staff
- Free trial · from $29.99/mo
Lindy
AI teammate for Slack that works across your team's tools
- Lindy starts at $29.99 per user / month, for 3,000 credits. Sintra starts at $52 per month on the 12-month plan, before the discount shown on site.
- Only Lindy lists a browser extension.
- Only Sintra lists iOS and Android apps.
- Lindy also covers meeting notes and inbox filtering.
- Sintra also covers marketing automation.
Suits: Teams that work in Slack and want one shared AI teammate
- Free trial · from $50/mo
Viktor
AI employee that works inside Slack and Microsoft Teams
- Viktor starts at $50 per month for 20,000 shared workspace credits. Sintra starts at $52 per month on the 12-month plan, before the discount shown on site.
- Only Sintra lists iOS and Android apps.
- Viktor also covers app builder and reports.
- Sintra also covers chat assistant and marketing automation.
Suits: Teams that already work in Slack or Microsoft Teams
- From $19/mo
Relevance AI
Low-code platform for building AI agents and multi-agent teams
- Relevance AI starts at $19 per month, billed annually (Pro). Sintra starts at $52 per month on the 12-month plan, before the discount shown on site.
- Only Relevance AI lists a browser extension.
- Relevance AI also covers no-code.
- Sintra also covers marketing automation.
Suits: Sales and support teams automating research, outreach and CRM updates
- Free plan · from $42.50/mo
AutoGPT
Open-source agent platform with a hosted team of AI Experts
- AutoGPT starts at $42.50 per month, billed yearly at $510 (Pro); $50 billed monthly. Sintra starts at $52 per month on the 12-month plan, before the discount shown on site.
- AutoGPT has a free plan. Sintra does not.
- Only Sintra lists iOS and Android apps.
- AutoGPT is open source and self-hostable, according to its own site.
- Sintra also covers chat assistant and marketing automation.
Suits: People who want ready-made agent roles before building any workflow
- Free trial · from $120/mo
Cofounder
Agent platform that runs the company work around your product
- Cofounder starts at $120 per month (Cofounder Pro, listed as a starting price). Sintra starts at $52 per month on the 12-month plan, before the discount shown on site.
- Only Sintra lists iOS and Android apps.
- Cofounder also covers sales pipeline.
- Sintra also covers chat assistant.
Suits: Solo founders and small teams launching an early-stage software company
Limits worth knowing in Sintra
- The website advertises no free plan or free trial; all paid plans carry a 14-day money-back guarantee.
- Prices here are the crossed-out list prices. When checked, the site sold the plans at 50% to 70% less and its FAQ gave $48.50 a month as the starting price.
- Each plan includes 250 credits a month for advanced AI actions; more must be bought as top-ups.
- The lower monthly rates on the 3-month and 12-month plans are charged as one payment for the whole term.
Common questions
What are the alternatives to Sintra?
The alternatives to Sintra in this directory are Marblism, Lindy, Viktor, Relevance AI, AutoGPT and Cofounder. Each one has a side-by-side comparison with Sintra.
Is there a free alternative to Sintra?
Yes. AutoGPT has a free plan alongside paid ones.
Is there an open-source alternative to Sintra?
AutoGPT is described as open source on its own site.
When were these prices checked?
Each listing shows its own date. On this page they run from Oct 5, 2026 to Oct 6, 2026. Vendors change prices without notice, so confirm on their site before you buy.