Local-first secondhand offer calculator

Lowball Lab

Know the fair offer, lowball, walk-away price, profit, ROI, and best comp checks in under 30 seconds before you message.

Get it on Google Play Try the math Newman AI Works

30-second offer range One-tap comp checks Walk-away ceiling Profit and ROI at ask

Listing iPhone 14 128GB unlocked Asking $295

Fair$246

Lowball$177

Walk$267

ROI18%

COUNTER

Phone example

Run the phone deal before you message.

Use the listing note, ask, resale value, and real costs. Lowball Lab turns that into a fair offer, lowball, walk-away price, profit, ROI, and a clear verdict.

01 Phone Paste the model, storage, lock status, battery, accessories, and ask.

02 Costs Add fees, repairs, shipping, pickup, and risk.

03 Verdict See buy, pass, counter, or lowball instantly.

Phones GPUs Consoles Laptops Anime Figures General Cameras Headphones Tablets Handhelds Bikes Furniture Sneakers

Verdict COUNTER

Offer below ask and keep the walk-away tight.

Fair offer$0

Lowball$0

Walk-away$0

Profit at ask$0

ROI at ask0%

Total friction$0

Why it exists

The asking price is only one piece of the deal.

Lowball Lab is for the quick moment before you send an offer. It helps you avoid fake-profit deals by forcing the real costs into the math: platform fees, repairs, shipping, pickup time, uncertainty, and the margin you actually want.

The draw is speed. Instead of doing rough mental math in a parking lot or message thread, you get a fair offer, lowball offer, walk-away ceiling, profit read, ROI, and a clear buy/pass/counter verdict.

App status

Android is live on Google Play.

Lowball Lab is scoped as a fast calculator first. The public site explains the workflow, the calculator preview shows the math, and the Google Play app keeps the same narrow promise: fast local decisions without marketplace automation claims.

PlatformGoogle Play liveAndroid is public; iOS remains in App Store prep.

PriceFree installOptional Pro upgrades support active deal hunters.

PrivacyLocal calculationNo marketplace login, no background scraping promise.

Current proofPublic Play listingThe Android app is available from Google Play.

How the numbers work

Resale minus reality.

Lowball Lab does not invent a value. You bring the expected resale price, then the app subtracts the costs and margin pressure that usually get ignored in a fast marketplace deal.

Expected resale$480

- Costs and fees$93

- Risk buffer$24

- Target profit$96

= Walk-away price$267

Walk-away is the ceiling

The highest price that still leaves room for costs, risk, and your target profit.

Fair and lowball are openers

Fair is a reasonable first offer. Lowball is the aggressive opener when the ask is too high.

Profit and ROI check the ask

The app shows what happens if you pay the seller's price before you waste time negotiating.

Verdict keeps it simple

Buy, pass, counter, or lowball based on whether the deal clears your margin.

How it works

Quick deal flow.

Check the seller ask, costs, offer range, and verdict before you message.

Drop in the listing

Paste the title or type quick notes for model, condition, accessories, and seller context.

Price the friction

Add fees, repairs, shipping, pickup cost, and risk so the deal is not fake-profitable.

See the range

Get a fair offer, lowball opener, walk-away ceiling, expected profit, and ROI.

Message with a plan

Use buy, counter, lowball, or pass before spending time in a negotiation thread.

One-tap compare

Check resale and retail before you trust the number.

Pro paths start from the item title, then jump into the strongest comp and retail checks without retyping. Lowball Lab opens the searches; you confirm the real numbers before the calculator recommends an offer.

Open Google Play

Resale comps

Use sold and marketplace listings to estimate what the item can actually move for.

eBay Sold Mercari Facebook Marketplace Google Shopping

Retail checks

Use major retailers as the replacement-price ceiling when the item is current or still easy to buy new.

Amazon Walmart Target Best Buy

No cluttered source list. No hidden scraping promise. The value is speed: one title, focused searches, confirmed numbers, then the offer range.

Free vs Pro

Pro tools for buyers who run more deals.

Free stays fast for quick manual checks. Pro is for repeat buyers who want one-tap comp checks, clearer deal breakdowns, saved ranges, and category tuning without turning the app into a heavy platform.

FreeManual calculator, offer range, walk-away, profit, ROI, and verdict.

ProOne-tap compare, deal breakdown, saved ranges, and category presets.

One-tap compareLaunch focused checks for eBay Sold, Mercari, Facebook Marketplace, Google Shopping, Amazon, Walmart, Target, and Best Buy from the same item title.

Deal breakdownShow what kills margin and what price makes the deal worth it: fees, repairs, risk, pickup cost, resale spread, and walk-away pressure.

Deal memorySave the last calculations and keep offer ranges handy while messaging sellers.

Category presetsFree categories: Phones, GPUs, Consoles, Laptops, Anime Figures, and General. Pro adds Cameras, Headphones, Tablets, Handhelds, Bikes, Furniture, and Sneakers.

Built for

People who need the math before the meetup.

Marketplace buyersLocal pickup, online listings, and quick resell checks.

FlippersPhones, GPUs, consoles, laptops, anime figures, cameras, headphones, tablets, handhelds, bikes, furniture, sneakers, and general finds.

Deal huntersAnyone who wants a clear offer ceiling instead of guessing under pressure.

Product updates

Get Lowball Lab update notes.

Join for release notes, Android update notes, iOS availability notes, and product feedback asks. This list is only for Lowball Lab.