Marketing
Product update email
Announce a product change to existing customers, with the action they need to take up front.
by Appndo
Tested on GPT-6.1 Sol, Claude Opus 5.5, Gemini 3.8 Flash · Verified Oct 27, 2026
The prompt
Write an email announcing this change to existing customers.
Product:
{{product}}
What changed, and anything customers must do:
{{change}}
Who receives it:
{{audience}}
1. Give three subject lines, each under 60 characters, that say what changed.
2. Write the email in plain text:
- If customers must act, put the action, the deadline and what happens if they don't in the first lines.
- Explain the change in terms of what customers can now do, not features.
- One clear call to action.
- Under 200 words, in the tone of a person writing to customers they know.
3. List any facts the email needs that I did not give (dates, links, prices), shown as [placeholders] in the email.
Use only facts I gave. Do not invent numbers, quotes, testimonials or benefits.How to use it
Give the facts plainly, including any deadline or action customers must take. Fill in the [placeholders] before sending.
Example
- product
- Ledgerly, invoicing and bookkeeping for small businesses
- change
- New bank connection system. The old one stops working on November 30; customers must reconnect their banks in Settings > Banking or transactions stop syncing. Takes about two minutes. Also: invoice editor is faster and there are 6 new invoice templates.
- audience
- All paying customers, mostly small-business owners