A reasonable first number when the deal still has room.
COMING SOON
Lowball Lab
A local-first offer calculator for secondhand buyers who want the math before they message.
Fair offer
Lowball opener
Walk-away ceiling
Profit and ROI
One-tap comp checks
Lowball Lab
Listing
iPhone 13 Pro, 256GB
$420 asking
Fair$246
Lowball$177
Walk$267
ROI12%
LOWBALL
THE PROBLEM
Marketplace deals move faster than the math.
Secondhand buyers often guess from the seller's ask, then remember fees, repairs, shipping, pickup time, and resale spread after the message is already sent. Lowball Lab forces those costs into the decision before the offer leaves your phone.
HOW IT THINKS
One listing becomes a clean offer range.
The app does not promise a resale value. You bring the comp, the app shows what the numbers allow.
The aggressive number when the ask is too high or the risk is real.
The ceiling where the deal stops making sense.
A fast read on whether the ask survives fees, repairs, shipping, and risk.
LOCAL-FIRST
Useful without a marketplace login.
Lowball Lab is built around fast private calculation. No seller account, no marketplace auth, no promise that the app can magically authenticate the item. It gives you the decision math, then you verify the listing like a human.
FREE VS PRO
Start manual. Add speed where it actually helps.
Free should stay simple enough to use in the middle of a deal. Pro should remove retyping, preserve ranges, and make comp checks faster without turning the app into a bloated marketplace tool.
Build Notes
Lowball Lab is the current Newman app proof piece: a trimmed product with local calculation, a focused product page, support/privacy/terms pages, waitlist capture, and one-tap comp-check direction for Pro. The build stays honest by avoiding marketplace scraping promises and keeping the buyer responsible for confirming real comps.
- Category
- Apps
- Collection
- Product Lab
- Year
- 2026
- Stack
- Expo, React Native, local storage, PHP launch site, MySQL waitlist
LOWBALL LAB WAITLIST
Get the launch signal.
Join for launch updates, early access notes, and product feedback asks. This list is only for Lowball Lab.