AI Founder Weekly

Marc Lou prices MailCheap at $19 vs beehiiv's $109

Marc Lou put a price on the newsletter tool he vibe-coded, and beehiiv's Tyler Denk had already published the several-hundred-item list of what he thinks is missing. Two other founders also swapped SaaS bills for API calls this week.

Real money

Marc Lou prices MailCheap at $19 where beehiiv Lite is $109

Marc Lou launched MailCheap commercially from $19 a month, saying 4,000 subscribers at one email a week costs $19 there against $109 on beehiiv Lite, and that you pay for emails sent, not dormant subscribers. Beehiiv's Tyler Denk had posted a long backlog of what a weekend clone misses: suppression lists, IP warming, bounce classification, blocklist monitoring.

Arvid Kahl
@arvidkahl
X
Hey Claude, implement every item on this list. Make no mistakes.
Oct 14, 2026 · View on X

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Lemkin says an agent cut late invoices from 56% to 8%

Jason Lemkin says an AI agent running quote-to-cash took SaaStr's late invoices from 56% to 8% in about a quarter, with average days overdue going 17 to 6. It reads the signed contract, creates the invoice in Bill, sends it within minutes, checks open invoices daily and pulls in a human at seven days past due.

Jason ✨👾SaaStr.Ai✨ Lemkin
@jasonlk
X
Along the way it found Bill reminders we’d paid for and never turned on, plus 2 customers still being billed for a product we stopped supporting 6 years ago.
Oct 14, 2026 · View on X

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Tony Dinh swaps a $124 translation SaaS for 75 cents of tokens

Tony Dinh says he dropped a $124 a month i18n tool for a built-in translation harness that cost about $0.75 to run 2,705 keys across 16 locales. He says the output is better because the model gets context: which feature and screen a string appears on, the internal word list, and how much screen space the text has.

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