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Sendable

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Subject-line testing for newsletters with under 10k subscribers.

MarketingSaaSCommunity
Sofia Bennett
Sofia Bennett
Founder
#0110
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Building at $0 since Jun 2026
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Sendable
Subject-line testing for newsletters
About this project

Subject-line testing for newsletters with under 10k subscribers.

Most A/B tools need list sizes that indie newsletters will never have. Sendable pools anonymised open-rate data across small senders in the same niche to give you a meaningful prediction before you hit send. Works with Substack, Beehiiv and ConvertKit.

  • Predict deliverability
    Know how a send will land before you press go.
  • Pooled sender data
    Learn from senders in your niche, anonymously.
  • Protect your domain
    Warnings before you burn your reputation.
  • Best time to send
    Timing suggestions based on real results.
Community feedback · 2

Smart people. Helpful takes.

  1. Ben Whitaker
    Ben Whitaker1mo agoIdea

    The pooled data idea is clever. I'd want to see how many senders are in my niche before trusting the prediction.

  2. Oliver Grant
    Oliver Grant20d agoPricing

    $12/mo for a tool I use twice a month feels steep. Per-send pricing?