Sponsor CRM for solo newsletter and podcast creators
Stage
Not given
Startup
Founded
Not given
2026
Based in
Not given
Not given
Pricing model
Free
Paid
Pricing
Not given
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
Save bookmarks, images, notes and PDFs
Create interactive tier lists, rankings and collections
Presentation Mode for recording content
Collaborate with other creators
Audience participation and interaction
Analytics on engagement
Browser extensions for all major browsers
Native apps for iOS and Android
Tag and filter organization
Export and import bookmarks
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
Turn research into interactive audience experiences, not just static posts
Built with privacy in mind, data processing in EU
Create once, keep valuable long after publishing
Let audience rank items and compare with creators
Magic-link portal eliminates sponsor account creation and email friction
One saved renewal pays for 8.5–51 months of KeelStack service
Rubra
KeelStack