A warranty tracking app is only as good as the date it starts counting from.
Every warranty tracking app starts with the same three fields: what I bought, when I bought it, when the cover ends. The third one is calculated, and it is usually calculated wrong, because the term often does not start on the day you paid. That one mistake is why a tracker can be full and still useless. This is the narrow corner of home inventory apps where the dates are hard and a missed deadline costs real money.
This page covers where cover actually starts, and what one product record has to hold before a claim is possible. Then which clock you are on once the factory term runs out, and what has to fire so a receipt and warranty app is more than a list.
See which date starts the clockThe short version
Two dates and a term decide everything, and only one of them is on the receipt.
A warranty record has a start and a length. The receipt gives you the day the money left, which is sometimes the start and often not. Delivery, installation and first use all appear as the commencing event in real warranty documents, and the document is required to tell you which one applies.
Get that wrong and the rest is decoration. The reminder fires on the wrong day, the claim goes in a week late, and the shoebox in the kitchen drawer would have done the same job.
The cover does not always start when you pay
Federal rules on what a written warranty has to disclose are a useful specification for your data model, because they list what the buyer is entitled to know. One required item is the point in time or event on which the warranty term commences, if it is different from the purchase date, together with the time period or other measurement of the duration. The law expects that the clock does not always start at the till, and it makes the seller say so in writing.
So the record needs two dates, not one: the day the money left and the day cover began. For an appliance ordered in March and installed in April those are three or four weeks apart. A product warranty app keyed to the receipt quietly hands back a month of free repair, every time, on every item that was fitted rather than carried home.
Some products add a third date, a registration deadline, which is the one that expires while you are still unpacking. And an extended service contract is a fourth term, sometimes running alongside the factory one and sometimes picking up where it stops. Store each term as its own row against the same product instead of trying to fold them into a single expiry date.
16 CFR 701.3, written warranty terms
Try it
Which date starts the clock
Pick the event the warranty document names, then say how long after payment it happened.
24 days of cover at stake
Cover runs from the installation date. That is 24 days after the receipt date, so a tracker keyed to the receipt retires the cover 24 days early.
A reminder 30 days before the real end has to fire 6 days before the receipt anniversary.
What one product record has to hold
The test for a record is not whether it looks tidy in a list. It is whether a claim can be filed from it without opening a drawer. That means brand, model, serial number, retailer, order number, price, purchase date, cover start date, term length and unit, an image of the receipt, the warranty document, and the steps for claiming.
The claim steps are the field everyone skips. The same disclosure rule requires a step by step explanation of what the buyer must do to get warranty performance, including who to contact. Copy that into the record on the day you file the product, while the paperwork is still in your hand. Nobody wants to be hunting for a support number on the morning a freezer fails.
On the receipt photo, be exact about what is automatic and what is not. Newly generates React Native and Expo projects. The project template it starts from carries the camera and photo library modules, and the build tooling checks that the photo permission strings are declared, so capturing a receipt and storing it against a product is ordinary work. There is no text recognition module in that template and nothing in the build tooling that reads a date off an image, so the purchase date is a field somebody types. Plan for typing and make that field the easiest thing on the screen.
If what you actually have is a pile of PDF invoices with line items on them, pulling those lines into rows is a different job for a different tool, closer to a pdf to excel app than to a warranty list. Keep the two apart. One is a parser and the other is a diary.
After the factory term you are on a different clock
A manufacturer warranty is a promise from the maker. Separately, the law gives the buyer rights against the seller, and the two do not expire together. In the European Union the seller is liable for a lack of conformity that existed when the goods were delivered and becomes apparent within two years of delivery, and member states may keep longer periods than that.
The burden of proof moves inside that window. A fault that appears within one year of delivery is presumed to have existed at delivery unless the seller proves otherwise, and member states may apply a two year presumption instead. For the app that is a second date worth storing and a second reminder worth firing: the delivery date, and its first anniversary.
In the United States the mix of federal and state rules is different, which is why a written warranty has to carry the line saying it gives specific legal rights and that other rights vary from state to state. The practical consequence for the record is small and easy to miss: store the seller and the country of purchase, not only the brand, because the route for a claim depends on both.
A date nobody is told about is not a deadline
The database is the cheap half. A warranty reminder app earns its keep on the day it interrupts you, unprompted, about a washing machine you had stopped thinking about. Without that, you have built a nicer shoebox.
Lead time belongs to the product, not to the app. A blender needs a week, because the claim is a box and a postage label. A boiler needs six, because the claim needs an engineer, an appointment and often a service history somebody has to dig out first. Store the lead days on the record and let them be edited, then count back from the real end date rather than the receipt anniversary.
Businesses hit the same wall from the other direction, with fifty identical units bought across four invoices and installed on different sites. At that point the thing you are building is an asset tracking app with warranty columns, and the question changes from when does this expire to which of these is still covered.
Getting the warning to actually arrive is a separate subject, because a phone that is closed will not run your timer for you. That part is the reminder before it expires, and it is worth reading before you promise anybody a warning.
Ways people keep track of warranties
| Option | Finds the receipt fast | Knows the real start date | Warns you before expiry | Holds serial and claim steps |
|---|---|---|---|---|
| Shoebox of paper receipts | No | No | No | No |
| Photos in the camera roll | if you recall the month | No | No | No |
| Email search for order confirmations | if the retailer still exists | No | No | No |
| Spreadsheet | Yes | if you added the column | only when you open it | Yes |
| A tracker you build | Yes | Yes | Yes | Yes |
Building one around what you actually own
Off the shelf warranty apps assume a household of consumer electronics with cover that starts at the till. The moment the list includes a boiler fitted six weeks after payment, a tool with five years on the motor and two on the battery, or fifty units bought across four invoices, the fixed fields start to fight you. Most people then go back to the spreadsheet, which never fires a reminder.
Newly is an AI app builder. You describe the app, including the date fields your warranties really use. It writes a real React Native and Expo project you own, runs it on a cloud simulator while it builds, and ships it to TestFlight and to Google Play internal testing. It is $25 a month and there is no free plan. iOS distribution needs your own Apple Developer account. It does not read your receipts for you and it is not a claims service.
Start with the record rather than the screens. Write down every field for one product you own, including both dates and the claim steps off its warranty card, and the rest of the app falls out of that list.
Questions people ask about warranty tracking apps
It is a record of what you own, when the cover on each item started, how long that cover runs and what a claim will ask for. The useful ones calculate the end date from the event that starts the term rather than from the receipt date, and tell you before that date arrives instead of after.
Describe the warranty dates you actually have
Take one product, write down its two dates, its term and what its claim procedure asks for, and build the tracker around that record.
Start building