You don't need a $13–$350/month email marketing platform to send professional invoices, reminders, and follow-ups. Helix email templates are built into your workflow — triggered by business events, auto-filled with client data.
Bottom line: Mailchimp Standard costs $168–$4,200/yr depending on contacts. Constant Contact is $144–$960/yr. ConvertKit starts at $180/yr. These are email marketing platforms built for newsletters and campaigns. Most solopreneurs need invoice emails, appointment reminders, and follow-ups. Helix includes these templates for $279 once — connected to your CRM, invoicing, and scheduling.
Compare standalone email tools to having templates built into your business suite.
Pricing verified March 2026.
Mailchimp is the default email marketing platform. Great for newsletters, campaigns, and audience segmentation. But it's designed for marketers, not service providers. You're paying for landing pages, A/B testing, and audience analytics when all you need is "send invoice to client."
Constant Contact is simpler than Mailchimp and popular with small businesses. Email campaigns, event invitations, surveys. Good if you regularly send newsletters. Overkill if your emails are invoices, reminders, and thank-you notes.
ConvertKit is built for creators — bloggers, podcasters, course creators. Strong on sequences and automation. Not built for service businesses sending invoices and appointment reminders. You'd be paying for a creator tool to do business admin.
Helix email templates are triggered by business events: invoice sent, payment received, appointment confirmed, follow-up due. Templates auto-populate with client name, job details, amounts, and dates from your CRM. No separate email platform. No contact limits. No monthly fees.
| Tool (Email only) | Year 1 | Year 3 | Year 5 |
|---|---|---|---|
| Mailchimp Standard (500) | $168 | $504 | $840 |
| Mailchimp Standard (2,500) | $720 | $2,160 | $3,600 |
| Constant Contact Standard | $420 | $1,260 | $2,100 |
| ConvertKit Creator | $180 | $540 | $900 |
| Helix (templates + everything) | $279 | $279 | $279 |
Most solopreneurs don't need email marketing — they need transactional emails. Invoice sent, payment received, appointment reminder, follow-up. Helix includes these built into the workflow. Mailchimp is built for newsletters and campaigns.
Mailchimp Standard starts at $13.99/mo ($168/yr) for 500 contacts. At 2,500 contacts: $59.99/mo ($720/yr). At 10,000 contacts: $100/mo ($1,200/yr). Helix email templates are included in the $279 one-time purchase.
Invoice sent, payment received, payment reminder, appointment confirmation, appointment reminder, follow-up after service, thank you notes, and custom templates. All auto-populate with client name, job details, amounts, and dates.
No. Helix is built for one-to-one client communication. If you need bulk campaigns, newsletters, or marketing automation, you'd want Mailchimp or ConvertKit. But most service-business solopreneurs need client communication, not mass email.
Mailchimp is for campaigns, newsletters, and audience building ($168-$4,200/yr). Helix templates are transactional — triggered by business events and auto-filled with CRM data. Different tools for different jobs.
Professional client communication built into your business suite. $279 once.
Calculate Your Savings· Data sourced from official pricing pages