CoreGPT Apps
GPT for Microsoft 365 & Google Workspace
Hey IH 👋
I've been building CoreGPT Apps — a suite of AI add-ins that bring GPT directly inside the productivity tools people already use every day.
The problem I kept seeing:
Most people who want AI help with their work end up doing this:
Write something in Word/Docs/Outlook
Copy it
Switch to ChatGPT in the browser
Paste it
Copy the result back
Switch back
It's friction that adds up fast. And it breaks your focus constantly.
What I built:
CoreGPT integrates GPT directly into the apps where the work actually happens — no tab switching, no copy-pasting.
Right now there are 10 integrations:
Microsoft 365: Word, Excel, PowerPoint, Outlook, OneNote, Teams
Google Workspace: Docs, Sheets, Slides, Forms
Each one is purpose-built for that app. For example:
In Outlook — draft replies, rewrite tone, summarize long threads
In Excel — generate formulas from plain English descriptions
In Word — write, rewrite, summarize, translate, and change tone in-place
In Teams — summarize meeting transcripts, draft follow-ups
Free tools as a top-of-funnel:
Alongside the add-ins, I built 18 free web tools (word counter, AI email subject generator, grammar checker, JSON to table, etc.) to drive organic traffic and let people try the AI quality before installing anything.
Where things are at:
Live on both the Microsoft AppSource and Google Workspace Marketplace
Free tier available — no credit card required to start
Working on SEO content and improving conversion from the free tools
What I'm figuring out now:
Which acquisition channel works best for B2B productivity tools like this (organic vs. marketplace rankings vs. content)
Pricing — currently free-to-start, thinking about where to draw the line
Happy to answer questions about building Office/Google add-ins, the marketplace approval process, or the tech stack. It was a surprisingly painful road.
3 Comments
Love the product! One thing I noticed — there aren’t any testimonials or case studies upfront. For a product like this, asking users to connect accounts and documents, missing social proof can make visitors hesitate and quietly lower conversions. Adding a few real user quotes could instantly boost trust and signup confidence.
I had a few more observations while browsing — happy to share if useful.
Ready to answer any questions if there
Hello,
Saw your product — looks like you're shipping fast. I'm researching how small SaaS teams keep their customers in the loop when they ship new stuff. Most teams I've talked to either don't do it or hate doing it manually.
Would love to hear how you handle it. 15 min, no pitch, just curious.