Substack Tool Guide
Updated July 2026
Substack is a publishing platform for newsletters, posts, and subscriber emails. PromptDC for Desktop rewrites your text in place inside Substack on macOS and Windows.
Substack tool guide
Rewrite text in place inside Substack.
Works everywhere
PromptDC for Desktop works in any app on Mac or Windows. The Chrome extension covers any website.
In-Place Rewrites
Transform rough notes into clear, structured instructions instantly.
Why Use PromptDC with Substack?
What PromptDC for Desktop does inside Substack.
Works inside Substack
Select your text in Substack, use the desktop shortcut, and review it before you Replace.
Review every rewrite
PromptDC shows the rewrite in an editable popover and never sends, posts, or presses Enter.
Choose a default
Choose any profile that fits, or add your own profiles and Custom Actions.
Switch profiles quickly
Assign profile shortcuts to switch quickly among Grammar, Explain, Concise, Social.
One-off instructions
Add a Custom Action to give one selection its own instruction, up to 19,000 characters.
Choose output language
Choose an output language or use Auto, then shape the rewrite with profiles and context.
Before and after text for Substack
Rough request on the left, the PromptDC rewrite on the right.
Before
this weeks tomatoes came late from rain picking early stopped most splitting
After
This week's tomatoes arrived late because of the rain. Picking them early prevented most of the fruit from splitting. That small change made a noticeable difference.
Why this is better: The text turns a garden observation into a clear lesson that flows naturally in a newsletter.
Before
68% picked monthly deep dives over weekly links so changing schedule next month
After
In our survey, 68% of readers preferred monthly deep dives. They chose them over weekly link roundups. The newsletter will switch to the monthly schedule next month.
Why this is better: The text connects the survey result to the schedule change, helping subscribers see the rationale.
Before
paid subs live q&a thursday 6 eastern send questions before noon thurs
After
Paid subscribers can join the live Q&A on Thursday. The session begins at 6:00 PM Eastern. Please send questions by noon on Thursday.
Why this is better: The text separates eligibility, event time, and the question cutoff for an easy newsletter notice.
Frequently Asked Questions
Learn shortcuts & usage?
Read the shortcuts docs
Need assistance with Substack?
Contact help & support
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