Is there a Vinted and eBay profit calculator that works offline?

Yes. FlipperHelper is an iPhone app that combines a Vinted and eBay profit calculator with full reseller tracking — and it works offline. You can log a purchase at a car boot or charity shop with no signal, enter the expected sale price, and see the calculated profit after platform fees and your costs. Everything stores locally; no internet required at the point of use.

What's the difference between a calculator and a tracker?

A calculator gives you a single number for one transaction — 'if I sell this for £25 on eBay, my profit is £18'. A tracker remembers every item over time — what you bought, where, when, what you paid, where you listed it, when it sold, what you actually netted. FlipperHelper does both. Many UK sellers start using it as a calculator and stay because the tracking accumulates a useful dataset over months.

Does it calculate Vinted seller fees correctly?

Vinted's seller fee structure changed in 2024 — UK and many EU sellers no longer pay a per-item fee, with buyer protection passed to the buyer instead. The Vinted fees blog post on this site has the full current breakdown. In the app, you record what you sold for and what you paid; for any seller-side platform charges in your region, you can include them as expenses on the item.

Does it calculate eBay fees correctly?

eBay UK fees vary by category, sale price, and seller status (private vs business). The eBay fees blog post and interactive eBay fee calculator on this site cover the current rates. In the FlipperHelper app, you record the sale price and your purchase price; for category-based eBay fees, you can include them as expenses per item or use the interactive calculator on the website to estimate them ahead of time.

How does it compare to web-based calculators like DashVue, FlipLytics, or MarginWise?

Web calculators are good for one-off 'should I buy this' decisions. They don't accumulate data — each calculation is forgotten. FlipperHelper's calculator is part of a tracker: every calculation becomes a logged item with photo, source, expected profit, and eventually actual profit. After three months you have a real picture of your business; after a web calculator session you have nothing.

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Last updated: 26 April 2026

Vinted & eBay Profit Calculator: Offline App for UK Sellers (2026)

26 April 2026 App 6 min read

If you're at a car boot, charity shop, or flea market and need a Vinted/eBay profit calculator that works without signal — FlipperHelper is the iPhone app for that. It combines a profit calculator with a full reseller tracker, runs entirely offline, and works in the UK, US, and other regions.

Web-based calculators (DashVue, FlipLytics, MarginWise) work fine on WiFi at home. They're useless when you're standing in the rain at 8am at a Wimbledon car boot with two bars of signal trying to decide whether £6 for a Karen Millen jacket is worth it. FlipperHelper handles the calculator part of that decision and remembers the answer for next month's dashboard.

Why an offline profit calculator matters for UK sellers

Most "decide whether to buy" calculations happen in the worst connectivity environments — markets, charity shops, jumble sales, indoor antique malls, rural estate sales. The calculator that works at home doesn't help you there. UK sellers in particular face this constantly: half the country's best sourcing locations are church halls, school car parks, and farm fields with no signal.

What an offline calculator needs to do:

Calculate profit instantly — purchase price, expected sale price, platform fees, postage, expected profit
Work fully offline — no API calls, no waiting for a slow data connection
Remember the calculation — so it becomes a logged item, not just a one-off number
Handle multiple platforms — Vinted, eBay, Depop, Facebook Marketplace each have different fee structures
Stay accurate — fee structures change; your records should reflect what was true at the time

How FlipperHelper handles the calculator + tracker workflow

At the source — quick decision

You're at a car boot. There's a £6 Karen Millen jacket. You open the app, snap a photo, enter £6 as the price. You can also enter an expected sale price (say £25 on Vinted) — the app calculates expected profit based on your saved fee structure and any expenses you've added.

If the maths works — buy it

The item is now logged. When you get home, toggle the platforms you list it on. The app records the listing date. When it sells, mark it sold and enter the actual sale price. The expected profit you calculated at the boot becomes the actual profit on the dashboard.

Over time — your real numbers

After three months you have data, not estimates. You can see: average profit per item from the local Wandsworth car boot is £8.40. Average profit from your Tuesday charity shop loop is £4.20. Vinted clothing sales close in 18 days on average; Depop closes in 32. This is what a calculator alone can't give you.

Offline, end-to-end

Every step works without internet. Photos store locally first; they sync to Google Drive when you have signal. The dashboard updates immediately, even on a flight or in a rural showground. You never lose a decision because the venue had no signal.

How FlipperHelper compares to web calculators and tracker apps

DashVue, FlipLytics, MarginWise (web calculators)

These are useful for one-off "should I buy this on eBay clearance" decisions at home. They typically have category-aware fee logic for eBay. They don't accumulate data — each calculation is forgotten. They don't work offline. And they don't track your actual outcomes once items sell, so you never learn how accurate your estimates were.

FlipperHelper's interactive eBay fee calculator

The interactive eBay fee calculator on this site is web-based — useful for category-aware fee estimation when you have WiFi. It complements the iPhone app, which is the offline workhorse for actual logging at markets.

Resellr, ResellTrackr, Profit Prophet

These are mobile reseller-tracker apps with overlapping feature sets. They each handle the basic per-item profit math. The differentiators are usually around expense tracking depth, platform coverage, and dashboard presentation. FlipperHelper's specific edges for the calculator-at-the-source use case: full offline mode, GPS market detection (so the source auto-fills), entry/transport expense tracking, and Google Sheets export.

Spreadsheet templates

A free reselling spreadsheet template is available on this site. Useful for analysis and tax records at the desk. Painful for offline calculations at a market — phone spreadsheet entry is slow and error-prone. Many resellers use a sheet template plus a mobile app.

Vinted and eBay fee specifics in the UK

The current fee picture for UK sellers (subject to platform changes — always check the latest):

Vinted — UK sellers no longer pay a per-item seller fee. Buyer protection is added to the buyer's price. Postage is integrated through Vinted's selected couriers. Full breakdown in the Vinted fees post.
eBay UK — fees vary by private vs business account, by category, and by sale price. The interactive eBay fee calculator handles the maths for you.
Depop — 10% selling fee plus payment processing. Facebook Marketplace is fee-free for local pickup, with shipping fees for posted items.

FAQ

Does the app calculate Vinted profit if I'm sourcing in the UK?

Yes. Record the purchase price and expected sale price; the app handles the maths. For category-specific fees on platforms like eBay, include them as expenses on the item or use the interactive calculator on this site for ahead-of-purchase estimation.

Is the app actually free?

Yes, the core app is free with no ads. A paid tier with eBay API integration is planned.

Does it support USD or EUR?

Yes. Multi-currency is built in — useful for France brocantes, Spanish flea markets, or US sellers using the same app.

Can I see how accurate my expected profit estimates are over time?

Yes. The dashboard shows actual profit per item once it sells. Compare this to what you estimated at the source — you'll quickly learn whether you're consistently optimistic, accurate, or pessimistic about resale prices.

About the author

Oleksandr Prudnikov builds FlipperHelper. The app was originally built for his wife, who resells full-time across UK car boot sales, charity shops, antiques fairs, and France brocantes. The offline-first architecture comes directly from her experience — too many markets and brocantes have no signal at all.

Calculate profit and track every flip

Free iPhone app. Works offline at car boots and charity shops. Vinted, eBay, Depop and 13+ other platforms.

Download on the App Store