For indie Substack writers
Grow your Substack by swapping audiences with writers like you
SplitLetter matches indie productivity writers for subscriber swaps — no cold DMs, no guessing. Just aligned readers.
Free to join · No spam · Cancel any time
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How it works
Three steps to your next 100 subscribers
01
Connect your Substack
Share your publication URL and tell us your niche. We read your content to understand what your readers actually care about.
02
Get matched by topic overlap
Our matching engine finds writers whose audience shares genuine interests with yours — beyond vague labels like 'productivity'.
03
Swap & grow together
Coordinate a cross-promotion with a single click. Both of you mention each other. Both audiences grow. No spreadsheets required.