Alternatives · AI Agents
Cofounder alternatives
Cofounder compared with 5 alternatives: Sintra, Marblism, Viktor, Relevance AI and Lindy.
Cofounder is a paid product with a free trial, starting at $120 per month (Cofounder Pro, listed as a starting price). None of the alternatives has a free plan. 2 more offer a free trial.
5 tools · Listings checked up to Oct 6, 2026 · Where the facts come from
At a glance
| Tool | Price | Free plan | Runs on |
|---|---|---|---|
| CofounderThis tool | Free trial · from $120/mo | Trial only | Web |
| Sintra | From $52/mo | No | Web, iOS, Android |
| Marblism | From $24/mo | No | Web |
| Viktor | Free trial · from $50/mo | Trial only | Web |
| Relevance AI | From $19/mo | No | Web, iOS, Android, Browser extension |
| Lindy | Free trial · from $29.99/mo | Trial only | Web, Browser extension |
How each one differs from Cofounder
- From $52/mo
Sintra
Bundle of 12 role-based AI helpers for small businesses
- Sintra starts at $52 per month on the 12-month plan, before the discount shown on site. Cofounder starts at $120 per month (Cofounder Pro, listed as a starting price).
- Only Sintra lists iOS and Android apps.
- Sintra also covers chat assistant.
- Cofounder also covers sales pipeline.
Suits: Solo founders and small businesses covering many roles
- From $24/mo
Marblism
Seven prebuilt AI employees for small-business admin and marketing
- Marblism starts at $24 per month on the yearly option. Cofounder starts at $120 per month (Cofounder Pro, listed as a starting price).
- Marblism also covers meeting notes and inbox filtering.
- Cofounder also covers sales pipeline and workflow automation.
Suits: Solo founders and small businesses without admin or marketing staff
- 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. Cofounder starts at $120 per month (Cofounder Pro, listed as a starting price).
- Viktor also covers app builder and reports.
- Cofounder also covers sales pipeline 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). Cofounder starts at $120 per month (Cofounder Pro, listed as a starting price).
- Only Relevance AI lists iOS and Android apps.
- Only Relevance AI lists a browser extension.
- Relevance AI also covers chat assistant and no-code.
- Cofounder also covers sales pipeline and marketing automation.
Suits: Sales and support teams automating research, outreach and CRM updates
- 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. Cofounder starts at $120 per month (Cofounder Pro, listed as a starting price).
- Only Lindy lists a browser extension.
- Lindy also covers meeting notes, chat assistant and inbox filtering.
- Cofounder also covers sales pipeline and marketing automation.
Suits: Teams that work in Slack and want one shared AI teammate
Limits worth knowing in Cofounder
- There is no lasting free plan: after the 7-day trial, Cofounder Pro starts at $120 a month, and the terms bill usage-based charges in arrears.
- The Team Plan, planned at $100 per seat, is not yet available; the pricing page offers only a waitlist.
- The documentation says Cofounder is not intended to build or rebuild your core product, database, authentication or hosting stack.
- You cannot bring your own API key or a Codex or Claude Code subscription, according to the pricing FAQ.
Common questions
What are the alternatives to Cofounder?
The alternatives to Cofounder in this directory are Sintra, Marblism, Viktor, Relevance AI and Lindy. Each one has a side-by-side comparison with Cofounder.
Is there a free alternative to Cofounder?
None of the alternatives listed here has a free plan. Viktor and Lindy offer a free trial.
Which Cofounder alternatives work on Android?
The Cofounder listing does not include an Android app. Sintra and Relevance AI list one.
Which Cofounder alternatives work on iOS?
The Cofounder listing does not include an iOS app. Sintra and Relevance AI list one.
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.