Sponsor CRM for solo newsletter and podcast creators
Stage
Not given
Startup
Founded
Not given
2026
Based in
FR
Not given
Pricing model
Paid
Paid
Pricing
Creators set their own price. Users pay that price plus a 5% service fee at checkout. Creators receive 80% of the message price; selected creators in the Ambassador Program receive 90%.
Starter: $39/mo (monthly) or $33/mo billed annually ($390/year with 2 months free). Pro: $59/mo (monthly) or $49/mo billed annually ($590/year with 2 months free). Business: $99/mo (monthly) or $83/mo billed annually ($990/year with 2 months free). All plans include a 14-day free trial with no credi
Key features
Set custom price for each message
8-day reply window with automatic refund
Creator earns 80% of message price
Free demand testing tool
Referral program earning 15% commission
Ambassador Program for 90% creator payout
No subscription or calendar required
5% service fee at checkout transparent to users
Earnings calculator
Stripe payment integration
Sponsor pipeline Kanban board with deal stages from Pitched to Churned
Magic-link sponsor portal with no account or password required
Automated renewal reminders at 30, 14, and 7 days before renewal
Invoice tracking with auto-numbered records and payment status
One-page branded, print-ready performance reports
Revenue dashboard with MRR, renewal rate, deal size, and quarterly trends
Platform-agnostic integration with Substack, Ghost, Kit, Beehiiv, and any podcast host
Read-only REST API included with Business plan
Custom reminder cadence and report branding on Pro and Business plans
What makes it different
Guaranteed personal replies or automatic refunds within 8 days
Filters out spam and low-effort messages by requiring payment
No content creation or subscription required
Free audience demand testing before joining
Magic-link portal eliminates sponsor account creation and email friction
One saved renewal pays for 8.5–51 months of KeelStack service
PayDM™
KeelStack