A food diary for PMOS (formerly PCOS) is worth keeping only if you can still bear to open it in week three. That is the whole test, and almost none of the marketing speaks to it. So rather than ranking apps, this page sets out the six questions that decide whether an app survives a normal month, and answers each one with what the apps currently on sale actually do.

We make Damson, a meal companion for PCOS that is not on the App Store yet. That makes us biased, so this page sticks to what each app verifiably does, and you can judge for yourself.

Everything below was read from App Store listings and developers’ own sites in August 2026. Prices are the United States listings and change often.

Does it explain, or only count?

A counter tells you a number. An explainer tells you what was on the plate and why that might matter to how the next two hours feel. Both are legitimate, but they suit different people, and the App Store screenshots rarely make clear which one you are buying.

At the explaining end, AskPMOS, from the research group at Monash behind the international guideline, is almost entirely explanation: plain articles tied to the guideline, a symptom tracker, a list of questions to take to your appointment. It has no food log at all, which is the trade it has made.

Among the loggers, NutriScan for PCOS puts fibre and protein next to calories and carbohydrate on its own product page, which is a more useful frame than calories alone. Balance: PCOS Nutrition goes further and interprets meals in terms of insulin and inflammation. That is a bigger claim than we would make from a photograph of a plate, but it is at least an explanation rather than a tally. At the other end, reviewers of the PCOS Tracker App describe a food log that accepts entries only in ounces, with no guidance on portions, which is counting without meaning.

Ask yourself which you want before you subscribe, because an app that only counts will make you the interpreter, on the days you have least appetite for it.

Can you correct it?

Every food app guesses. Scanners guess from a photograph, databases guess from a name, and meal plans guess from a quiz you answered in two minutes. The question is not whether it guesses wrong but what happens next.

This is where the reviews are most instructive. Users of the PCOS Tracker App report having to add one ingredient at a time and finding “no way to edit if you make a mistake”. An app you cannot correct trains you to stop logging, because a record you know is wrong is worse than no record.

So test it on the first day. Log something deliberately wrong, then try to fix it. Change the portion. Delete a meal. Add the yoghurt you forgot. If any of that takes more than a few taps, the app will decay into a graveyard of half true entries within a fortnight. Scanner led apps such as NutriScan for PCOS and Balance: PCOS Nutrition live or die on this, because a scan is a starting guess by definition.

Does it moralise?

Some apps are built on a philosophy. Cysterhood, made by a registered dietitian who has the condition, is organised around gluten free and dairy free eating, with more than 250 recipes on that basis and weekly live coaching. That is a clear position rather than a guideline one, and if it matches how you want to eat, the structure is a real advantage. If it does not, you will spend your subscription arguing with the app.

Others tell you their frame in the name. Two of the better known listings in this category carry weight results in the title or subtitle. That is their choice and we mention it only so that the tone inside does not surprise you.

The thing to watch for is not opinion, which is unavoidable, but judgement: red marks, warnings, language that implies you failed. You will eat cake at a birthday. An app that treats that as a breach is an app you will delete in the week you most need a record.

What happens to your records?

Your food diary is a health record. Read the privacy label on the App Store listing before you install, because the labels in this category vary more than anything else about these apps.

Cysterhood states plainly that the developer collects no data from the app, which is the strongest label in the category. AskPMOS, despite being free and academic, reports health data, contact information and user content linked to your identity, plus analytics that are not. PCOS Polly reports health data, contact information, purchase history and user content linked to your identity. Balance: PCOS Nutrition and the PCOS Tracker App both report data that may be used to track you across other apps and websites. Aspect Health, whose programme is built around a wearable sensor, reports health and fitness data, location and sensitive information linked to your identity, with location possibly used to track you across other apps.

Then ask the questions the label does not answer. Can you export your own record? Can you delete your account inside the app rather than by email? Does the diary work if you never create an account at all? Damson keeps records on the device by default and does not sell a profile of you, which is easy for us to say and worth checking against our privacy page rather than taking on trust.

Can you leave?

The exit is part of the product. Before you enter a card, find out where the cancel button is and whether the subscription will appear in your Apple subscriptions list, where you can end it yourself.

The reason to insist on this is in the reviews. Users of the PCOS Tracker App report being charged after cancelling, and a subscription that does not appear in Apple’s own list, which leaves you emailing a company to stop taking your money. We cannot verify any single account, but there are enough of them, and they are specific enough, to justify the two minutes of checking. Note also which listings publish a price at all: Aspect Health advertises a sale rather than a figure, and NutriScan for PCOS offers a seven day trial without publishing what follows it. Allara Health, at the clinical end, says plainly that a card is kept on file and that there is no long term commitment, which is the kind of sentence you want to find before you need it.

And ask what remains yours afterwards. A diary you lose when the payment stops was a rental, not a record.

Does it survive a bad week?

The last question is the one that decides everything. Some weeks you will log three meals a day with photographs. Some weeks you will manage a single line on a Wednesday. A good diary has to be usable in both, and most are designed only for the good week.

Look for the low effort path. Can you record a meal in one line without a photograph, a portion size and a mood rating? Is there anything that punishes a gap, or does the app simply pick up where you left off? Go Go Gaia is instructive here: its core tracking is free, including nutrition alongside symptoms, so a light week costs you nothing and the record stays continuous. Cysterhood and Allara Health take the opposite approach, which also works: a person you check in with weekly carries the weeks your own attention does not.

Damson is built around this question, because the check in after a meal is the whole point of it. It is not released yet, so treat that as a statement of intent rather than a recommendation. If you need a diary this week, one of the apps above will serve you better than an app you cannot download.

Questions people ask

What is the best PCOS food diary app? The one you will still open in three weeks. Practically, that means a fast logging path, easy correction, a privacy label you are comfortable with, and a tone you can live with. Those four beat feature lists every time.

Can I just use a normal food diary app for PCOS? Yes, and many people do. A general food diary you already know will beat a PCOS branded app you find irritating. What the general ones will not do is connect what you ate to how you felt afterwards or to your cycle, so you may end up keeping that part in notes.

Do I need an app that scans my food? Only if photographing is genuinely easier for you than typing. Scanning is a guess that you then correct, so it saves time only in an app where correcting is quick. Test that before you pay for a scanner subscription.

Should the app track my symptoms too, or just food? If you want to see whether a pattern exists between the two, they need to live in the same place. Several apps here do both, with different centres of gravity: Go Go Gaia starts from the cycle, PCOS Polly from habits, the loggers from meals.

The bottom line

Ask six things: does it explain or only count, can you correct it, does it moralise, what happens to your records, can you leave, and does it survive a bad week. Answer them from the App Store listing and a free trial rather than from anyone’s ranking, including ours. The best PCOS food diary app is not the one with the most features. It is the one that is still there, honest and unbothered, on the Wednesday you manage one line.

Choosing a PCOS food diary app: what actually matters