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Sincerely is AI direct mail for B2B revenue teams. For each target account, it researches the company and writes a postcard, letter, handwritten note, or gift note for one person, with every claim linked to its source. One campaign sequences all four formats to the same account. Nothing prints until a person approves it. An account-level holdout reports the lift with an interval. Run it in the app or from Claude or ChatGPT over MCP.
Hi Product Hunt, I’m Adam, and I'm building Sincerely.
Outbound email became nearly free, and inboxes filled with sequences nobody asked for. Physical mail went the other way. There’s less of it, so a good letter gets read. But running a careful B2B mail campaign still meant spreadsheets, a designer, a printer, and tracking links that couldn’t tell you whether any of it worked.
Sincerely puts that chain in one place. Bring a list from Salesforce, HubSpot, or a CSV, or describe who you sell to and the agent finds the accounts. It checks every address, researches each company, and writes a piece for one person from sourced facts you can review. A person approves everything before it prints.
The part I care about most is measurement. Most mail and gifting tools report “influenced pipeline”, which only tells you that a deal touched the campaign. Sincerely holds out a random set of accounts and reports lift with a confidence interval. When the data isn’t there yet, it says “not proven yet”.
You can set everything up for free, and nothing mails until you pick a plan. A $199 pilot covers a first real send. It works in the US and Canada today.
I’d love feedback, especially from anyone who has tried to measure direct mail before.
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About Sincerely on Product Hunt
“Personalized direct mail at scale, for B2B teams.”
Sincerely was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #139 on the daily leaderboard. Sincerely is AI direct mail for B2B revenue teams. For each target account, it researches the company and writes a postcard, letter, handwritten note, or gift note for one person, with every claim linked to its source. One campaign sequences all four formats to the same account. Nothing prints until a person approves it. An account-level holdout reports the lift with an interval. Run it in the app or from Claude or ChatGPT over MCP.
Sincerely was featured in Writing (59.5k followers), Marketing (470.7k followers) and Artificial Intelligence (483.5k followers) on Product Hunt. Together, these topics include over 238.6k products, making this a competitive space to launch in.
Who hunted Sincerely?
Sincerely was hunted by Adam. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Sincerely stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Adam