The verdict
On the data we hold, it's close: neither pulls ahead on features, a free plan or AI access. The choice comes down to how you work.
What the data says
- Both have a free plan, so you can try each before you pay.
- Success.co starts lower, at $11/mo against $29/mo.
- Both have an API and an MCP server, so either works with AI employees.
- In our Team ranking, Assembly places 1 and Success.co 3 of 14.
Side by side
| At a glance | ASAssembly | |
|---|---|---|
| Starts at | $29/mo | $11/mo |
| Free plan | Yes | Yes |
| API | Yes | Yes |
| MCP server | Yes | Yes |
| Links |
Plans and pricing
AS
Assembly
- FreeSolopreneurs testing client portalsFree
- StarterSolo consultants needing API access$49/mo
- ProfessionalSmall teams wanting automation and custom domains$99/mo
SU
Success.co
- All InclusivePer-user paid plan with full EOS feature suite$12/mo
- Enterprise Add-OnsSSO and Directory Sync add-ons for IT/security requirements$500/mo
Prices as the vendors list them. They change often; the final price is on their sites.
Who each is for
Other options worth a look
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From $25/moFree plan - TRTool·PeopleManages field job scheduling, quoting, invoicing and accounting sync for trade contractors and service businesses.
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From $47/moFree plan