FlipMath privacy policy

Who we are

FlipMath is made by Wavista Apps, operated by William Tsao, an individual based in California, USA. Contact: support@wavistaapp.com.

What stays on your iPhone

FlipMath has no account. It saves these only in the app's storage on your iPhone:

• your trips: store name and type, notes, and start and end times;
• your scans: the photos, the AI result, the eBay price summary, tag price, expected sale price, marketplace, shipping size, the Buy, Maybe or Skip verdict, and whether you bought it;
• your inventory: title, category, cost, status, dates, sale price, fees, shipping and notes;
• your settings (fees, shipping, tax and verdict thresholds) and your setup answers.

The profit math and the verdict are worked out on your iPhone. Spoken verdicts are spoken by your iPhone. The app copies listing text to the clipboard only when you tap Copy.

If you back up your iPhone to iCloud or a computer, the backup includes this data, as it does for any app.

What leaves your iPhone, and who receives it

Our server and OpenAI (item identification and listings)

AI analysis needs your permission. The app asks on a consent screen first, and nothing is sent if you choose Not now. FlipMath does not analyze items on your iPhone; every identification goes through our server.

• Identify an item: the app shrinks each photo and removes its metadata, including any location, and sends our server 1 or 2 photos (the item and, if you took one, its label or maker's mark), the type of store you are in (for example thrift) and which photo is which.
• Write a listing: no photos. The app sends the item details from the identification (such as type, category, brand or maker, model or pattern, era, materials, mark text and visible condition), or just the item title, plus your condition notes (up to 600 characters), the tone you chose and your marketplace's name. No prices are sent.

Our server removes any remaining photo metadata and sends these to OpenAI to get the result. It keeps them in memory only while it gets the result. It does not save them or write them to its logs.

OpenAI receives the photos and details, but not your name or the app's anonymous ID. We send each request with OpenAI's storage option turned off (store=false), so OpenAI does not keep it as a stored conversation. OpenAI does not use API data to train its models. It may keep API data for up to 30 days only to check for misuse, and then deletes it. eBay results are never sent to OpenAI.

The app keeps your scan photos on your iPhone until you delete the scan or use Delete my data.

Withdraw your permission at any time: Settings, Use AI analysis.

eBay (current listings)

To show what similar items are listed for, the app sends our server the short search phrase the AI wrote for the item (for example a brand and item type). Our server searches eBay with our own app key and sends eBay no ID and nothing else about you. It keeps each search's results in memory for about an hour, shared by anyone who searches the same phrase. If an eBay search fails, our server's error log may include the search phrase, with no ID.

If you tap an example listing, it opens eBay's own page in an in-app browser, and eBay's privacy policy applies to that visit.

What our server keeps

Every request to our server carries the app's anonymous ID (a random ID created by RevenueCat, see below), so the server can check your subscription and daily limits. Our server keeps:

• A record of each AI request: the time, the feature, which kind of AI answered, whether it worked, how long it took, its cost, the confidence of the answer and your answer to "Was this right?" if you give one. It is tied to a scrambled form of the anonymous ID (a salted hash), not the ID itself, and never includes photos, notes or items. Records are deleted after 90 days.
• Daily usage counts for AI requests and eBay searches, tied to the scrambled ID, deleted after 90 days.
• Your subscription status: the anonymous ID with the product, the expiry date, whether it is a trial and whether it was a test purchase. RevenueCat sends this to our server when your subscription changes. We keep it until you use Delete my data.

Our server uses your IP address for a moment, in memory, to limit how many requests one connection can make. It does not save it in its database or its logs. Our server runs on Fly.io, and its database is hosted by Supabase, both in the United States. Every hour we save a backup copy of that database in a separate private storage bucket at Cloudflare R2. Each copy is encrypted before it is uploaded, with a key that only we hold, so Cloudflare cannot read it. We use backups only to recover the database if something goes wrong.

RevenueCat (subscriptions)

RevenueCat runs the subscription for us. It receives the app's random anonymous ID, your App Store purchase records (what you bought, when, its price, and trial and renewal status) and technical details such as the iOS and app version. Its software also sends the identifier for vendor, an ID that Apple gives our apps on your iPhone. RevenueCat never gets your name, email or payment card. If you installed the app from an ad on the App Store (Apple Ads), Apple tells RevenueCat which ad campaign, ad group and search keyword led to the install, so we can see whether our ads pay for themselves. This is Apple's own ad attribution: it does not use the advertising identifier and needs no tracking permission. Apple handles payment.

PostHog (usage analytics, which you can turn off)

We use PostHog to see how the app is used, so we can find problems and improve it. Analytics are on when you install the app, and you can turn them off at any time in Settings, Share usage analytics. When they are off, the app sends nothing to PostHog. When they are on, PostHog receives, tied to the anonymous ID:

• the setup answers you pick from a list: how you resell, what you look for and where you sell most. Your minimum profit and minimum multiple of cost stay on your iPhone;
• events such as opening the app, setup steps viewed, permission answers, your AI choice, when the subscription screen was shown, trials, purchases and restores, when an identification started, finished (how long it took, its confidence) or failed (an error code), your thumbs answer and review prompts;
• that you scanned an item (its category, whether listings were found and how many), saw a verdict, bought an item, made a listing, sold an item (with no price or profit) or finished a trip (how many scans and buys);
• details the PostHog software adds, such as the app version, iOS version, device model, language, time zone and screen size.

PostHog never receives your photos, item names, store names, notes, or any price or profit. Session recording, touch tracking and location lookup from your IP address are turned off. PostHog does not store your IP address.

Sentry (crash reports)

If the app crashes or hits an error, it sends a report to Sentry so we can fix it: what went wrong and where in the app, the device model, iOS and app version, a random ID Sentry makes for the install, and a short trail of what the app did just before. For about 1 in 10 sessions it also sends performance timings. Reports do not include the anonymous ID. Before a report is sent, the app cuts a failed database save down to the kind of action and the table name, so a report never includes what you were saving (such as an item title, store name, note or price). It also leaves out request details and console logs. Sentry does not store your IP address.

Apple

Apple handles the App Store, payments and iPhone backups under Apple's own privacy policy.

Email to support

If you email us, we receive your email address, your message and the details that Contact support adds (app version, iOS version and the anonymous ID). We use them only to help you. We keep support emails for 2 years after your last message, then delete them. Cloudflare forwards them to our Gmail (Google) inbox.

Permissions

• Camera and photos: only to take or choose a photo of an item or its label.

FlipMath does not use your location, contacts, microphone or Apple Health.

How long data is kept

• On your iPhone: until you delete it, use Delete my data or delete the app.
• Photos and details on our server: not stored, only held in memory during the request.
• eBay search results on our server: in memory for about an hour, not tied to you.
• At OpenAI: up to 30 days, only for misuse checks.
• Request records and usage counts on our server: 90 days.
• Encrypted backups of our server's database: hourly copies for 3 days and daily copies for 35 days, then deleted automatically. Anything removed from the database, including by Delete my data, is gone from every backup within 35 days.
• Subscription status on our server: until you use Delete my data.
• RevenueCat: for as long as we offer the app, so your subscription can be restored.
• PostHog: up to 1 year, or until you use Delete my data.
• Sentry: 30 days.

Delete my data

Open Settings and tap Delete my data. The app deletes everything it saved on your iPhone right away (your trips, scans, photos, inventory, answers and settings) and starts again from the beginning. Analytics are turned off on that iPhone until you turn them on again in Settings. Listings you already pasted into a marketplace are not affected. Then it asks our server to:

• ask PostHog to delete your analytics profile and its events;
• delete your subscription status record;
• remove the scrambled ID from your request records, so they can no longer be tied to you (they are still deleted at 90 days);
• delete your usage counts from earlier days. Today's counts stay until they expire, so daily limits still work.

Backups made before the deletion still hold the old records until those copies are deleted, at most 35 days later. Nobody can read a backup without our encryption key, and we use backups only to recover the database after a failure.

If your iPhone is offline or our server cannot be reached, the app tries again by itself. While the deletion is waiting for our server, Settings shows it and offers Email support. If you delete the app before then, it can no longer finish this step, so first email us from Contact support (it adds the anonymous ID we need) and we will delete the server copy.

Delete my data does not cancel your subscription and does not delete RevenueCat's purchase record, so you can still restore your subscription. To ask for your RevenueCat record to be deleted too, email us.

Your requests

You can email support@wavistaapp.com to ask what we hold about you, or to delete it. Send the email from Contact support in the app so it includes the anonymous ID; we cannot find your data without it, because we do not know your name. We reply within 30 days.

What we do not do

We do not sell your personal information or share it for advertising. The app has no ads and does not track you across other companies' apps or websites.

The app does not track you across other companies' apps or websites, so there is nothing for a Do Not Track signal to turn off, and the app does not respond to one.

Children

FlipMath is not directed to children under 13, and we do not knowingly collect data from them. If you think a child has used the app, email us and we will help delete the data.

Where the law requires it, the app asks Apple for your age range. The answer stays on your iPhone, is used only to apply age protections, and is never sent to us or anyone else. If Apple says you are under 13, or you choose not to share your age range where it is required, the app turns off usage analytics, Apple Ads attribution (see RevenueCat above), the AI features that send photos to our server and OpenAI, and your answers about AI results.

Security and where data is processed

The app talks to our server and service providers over encrypted connections (HTTPS). Our server stores the anonymous ID only in scrambled form, except in the subscription record. Our server, its database and our service providers process data in the United States. Database backups are encrypted before upload and kept in Cloudflare R2's Eastern North America region.

Changes to this policy

If we change this policy, we will post the new version here with a new effective date. If a change affects how we use data you already gave us, we will tell you in the app first.

Contact

support@wavistaapp.com

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