Sumline
Runs real estate numbers in ChatGPT, such as seller net proceeds, cash to close, rental returns and mortgage payments.
What Sumline can do in ChatGPT
Property numbers for agents and investors.
Seller Net Proceeds
Work out what a seller walks away with.
Cash To Close
Buyer cash needed and monthly housing costs.
Rental Analysis
Returns on a rental from price, rent and loan.
Mortgage Payments
Monthly payment for a fixed-rate loan.
Continue In Sumline
Open the scenario in the Sumline web app.
You stay in control
You approve access, and you can disconnect Sumline at any time.
Apps 1
What Sumline does in ChatGPT
The Sumline plugin gives real estate professionals property numbers inside ChatGPT without having to explain the math each time. You ask in normal words about seller net proceeds, a buyer's cash to close and monthly housing costs, rental property returns or fixed-rate mortgage payments.
It uses the same fixed calculation engines as the Sumline web app, so the same inputs always give the same result. Each answer comes back with the figures, the assumptions used, any warnings and a link to carry on with the scenario in Sumline itself.
It does not decide whether someone qualifies for a loan or can afford a home, and it does not give legal, tax, lending, appraisal or investment advice. Think of it as a calculator that shows its working, so you can share clear numbers with clients.
Who it is for
- Real estate agents preparing net sheets
- Loan officers showing buyers their costs
- Rental property investors
How to add Sumline to ChatGPT
- Open the Sumline listing in ChatGPT ↗.
- Click Install plugin.
- Sign in to your Sumline account when asked and approve the access it requests.
- Start a chat and ask for what you need, mentioning Sumline if ChatGPT does not pick it up.
- To stop, disconnect Sumline under apps in your ChatGPT settings.
Questions about Sumline
What is the Sumline ChatGPT plugin?
The Sumline plugin gives real estate professionals property numbers inside ChatGPT without having to explain the math each time. You ask in normal words about seller net proceeds, a buyer's cash to close and monthly housing costs, rental property returns or fixed-rate mortgage payments. It is listed in ChatGPT's plugin marketplace under Finance.
What can I ask Sumline to do in ChatGPT?
For example: "Seller net proceeds for a $525,000 sale in North Carolina with a $285,000 payoff", "Cash to close and monthly costs for a $425,000 home with 20% down at 6.5%", "Analyse a $320,000 rental with $2,600 rent, 20% down and a 6.5% 30-year loan".
Who makes the Sumline plugin for ChatGPT?
The ChatGPT listing names STEPHEN TROY NYBERG as the developer. The version listed on 8 October 2026 was 1.0.0.
How do I add Sumline to ChatGPT?
Open the Sumline listing in ChatGPT, click Install plugin, sign in to your Sumline account and approve the access it asks for. Then ask for what you need in a chat, mentioning Sumline if ChatGPT does not pick it up.
Can Sumline change things in my account, or only read?
It runs calculations from the figures you give and returns results with a link to continue in Sumline. The listing does not describe access to client records.
Who is the Sumline plugin for?
Real estate agents preparing net sheets, loan officers showing buyers their costs and rental property investors.
Does Sumline decide if a buyer qualifies for a loan?
No. The listing says it does not determine loan qualification or affordability.
Are the calculations the same as the Sumline web app?
Yes. It runs the same deterministic engines used by the Sumline web app.
Does Sumline see my ChatGPT chats?
When Sumline is connected, ChatGPT may share the parts of your chats and memories that matter for a request with Sumline. What Sumline does with that data falls under its own terms and privacy policy. ChatGPT keeps your training-data settings, and you can disconnect at any time.
How do I disconnect Sumline from ChatGPT?
Open your ChatGPT settings, go to apps, and disconnect Sumline. You can reconnect later from the listing.
What are alternatives to Sumline in ChatGPT?
Similar plugins in the ChatGPT marketplace include Cactus: Real Estate Analysis, Cashfree and Pretto. Each has its own page in this directory.
Privacy and your data
When Sumline is connected, ChatGPT may share the parts of your chats and memories that matter for a request with Sumline. What Sumline then does with that data falls under its own terms and privacy policy, not only OpenAI's. ChatGPT keeps your training-data settings for data that comes from connected apps, and you can disconnect at any time.
Sumline privacy policy ↗Sumline terms ↗OpenAI: apps in ChatGPT ↗