Your attention is valuable.
You shouldn’t have to give it away to strangers who decided your address was a good target.
Economics, not algorithms.
Traditional spam filters are probabilistic. They try to guess what’s real. That’s a difficult question to answer well, and as reported by Keepnet Labs, AI-generated messages are now 24% more effective than human-written ones at getting past content-based filtering.
Rythm takes a different angle. We don’t try to tell real from fake. Rythm is a bouncer. We check whether the sender is on your guest list, and if not, whether they paid a small cover charge. Both are things you control. An email written by a human or by AI is treated the same way. If the sender cared enough to pay, the message comes in. If they didn’t, it waits for your review. Rythm filters for intention, not content.
Economics, not algorithms.
A small team building in public.
Rythm was founded in 2025 by Sean Dudgeon. We’re a small team building in public. Sean writes the Rythm blog and ships the product alongside a handful of collaborators. No venture-scale growth targets. No ads. Just a product that earns its keep.
We’re based on the idea that your inbox should be yours, not a channel sold to whoever pays the most for your attention this quarter.
Three things we hold to.
Your inbox should be yours.
Not sorted by an algorithm that decides what matters. Not gated by a provider who decides what reaches you. Your venue, your rules.
A bouncer should have all muscle and no curiosity.
Rythm reads just enough to check for a payment proof, then forgets. No training data. No behavioral profiling. No selling what the bouncer overheard at the door.
how we make money
Subscription. $1.65 a month. That is the entire customer relationship.
We do not sell data. We do not run ads. We do not store email content. We earn your business every month, with no annual contracts and no lock-in. Our incentives are simple: make the product good enough that you stay.
