Option A
Refiner
Marketing
Customer feedback for SaaS.
Refiner is a microsurvey platform for SaaS — in-app NPS, CSAT, and PMF surveys with deep segmentation.
- Founder
- Jakob Knutzen
- Founded
- 2017
- Team
- 1-10
- Listing
- Free (nofollow)
- Listed
- May 2026
Compare
Refiner vs Buttondown
Side-by-side comparison of two indie startups from the Startup Spotlight directory.
Option B
Buttondown
Marketing
The fastest way to start a newsletter.
Buttondown is a Markdown-first newsletter platform built by a solo founder — beloved by engineers and indie writers.
- Founder
- Justin Duke
- Founded
- 2017
- Team
- 1-10
- Listing
- Free (nofollow)
- Listed
- May 2026