For writers on Substack and LinkedIn

Keep showing up between essays.

Pennywurth turns each essay into a month of posts in your voice, so your readers hear from you every week while you write the next one. You approve each post, and Buffer publishes it.

We'll only email you about Pennywurth's launch. Privacy policy

Try it on a real article →
Nothing posts without your OK. We don't train on your writing.
Your month

What your readers see between essays

How often do you publish an essay?
On your own26 quiet days after the essay
With Pennywurth11 new posts before the next essay
Week of 9 NovWeek of 16 NovWeek of 23 NovWeek of 30 Nov
Essay A post sharing the essay A new post from the essay Your readers hear from you three times a week, every week.
How it works

One article becomes weeks of posts

These articles are real. Pick one and press the button to see the ideas Pennywurth finds in it. Point at an idea to see where it came from.

Try it on
Unreliability · Substack · by Obakeng Mosadi

Visualizing Local Municipalities Spend with ClickHouse

What the article says, in short

At 10 million rows, Clickhouse was ~9 times faster (40ms versus 354 ms) on the trend query.

In the first run, 32 simultaneous trend queries took 12 seconds each, caused by one function call.

Stellenbosch's derived debtor age buckets add up to the source total of R1,134,152,973.

Nelson Mandela Bay reports around R24bn a year in capital renewal for 2020–2023, then R0.7bn in 2024.

Read the full article ↗
Ideas will appear here.
Your voice

It learns how you write, from five things you've written.

Pennywurth shows you the habits it noticed, with your own lines as proof. You keep the habits that fit, and Pennywurth writes every post with them.

The film is finished. I decided that this week.

Both sentences share the same news. Pennywurth writes the first one.
Made for Substack and LinkedIn

Each post fits the place it's going.

LinkedIn
For two years I thought my short film wasn't finished. …more
LinkedIn shows about 140 characters on phones before “…more”. Pennywurth checks that your opening fits above it.
Substack Notes
“@ClickHouse” will go out as plain text. One link, no image.
Notes have their own rules. Pennywurth checks each one before it goes to Buffer and suggests a fix.
Your newsletter
Title Subtitle Body
Substack doesn't let apps publish for you, so Pennywurth gives you the title, subtitle and body to paste.
The editor

Keep every version of a sentence.

Rewrite a sentence as often as you like. Pennywurth keeps each version, so you can go back to an earlier one. Lines you cut are kept too, and you can turn them into posts later.

Pennywurth doesn't suggest posts while you write. It waits until you say you're done.

Try it: click the yellow sentence, or cut the last line.
Sample draft · Essay · Draft 6

Finished is a feeling

For two years I thought my short film wasn't finished. Every week I found something to change.

Then one night in March I watched the newest cut next to the one from January. Neither cut was better. They were only different.

Nothing I changed after that made the film better.

The film has been out for a month, and I haven't once wanted to open the project file.

Saved · No cuttings yet
You stay in charge

You approve every post.

  • Nothing posts without your OK.
  • Posts go into the time slots you already set in Buffer.
  • You can undo any send.
  • We don’t train on your writing or share it.
You're set until 9 Dec.

Go write the next one.

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We'll only email you about Pennywurth's launch. Privacy policy