Type “ultrasound” into the Play Store and dozens of results appear, some with millions of downloads and high ratings. It's natural to conclude that at least one of them works. That's not the case: No app can perform an ultrasound using only a cell phone., The results of this search fall into four very different categories.
Understanding these four categories is the quickest way to avoid wasting time—and to avoid trusting something you shouldn't. Let's look at them.
Category 1: Simulators and pranks
These are the vast majority of results. The app opens the camera, you place the phone against your belly, a scanning animation runs for a few seconds, and a grayscale image appears that looks like an ultrasound.
This image is a file that was already inside the application. It has no relation whatsoever to what is being pointed at — it works the same way as pointing at a pillow. Many of these applications state in their description that they are for entertainment, usually at the end of the text, where few people read. Others don't state anything at all.
How to recognize: category Entertainment instead of Health, description with the words simulator, joke or prank, and screenshots always with the same baby image.
Category 2: Exam viewers for professionals
There are reputable applications that open imaging exams in the DICOM standard, the format used by hospitals and clinics. They allow doctors to consult an exam that... It has already been done. in a real piece of equipment.
They don't generate images: they only display, measure, and annotate a received file. If you install one of them expecting to run an exam, you'll encounter a screen asking you to import a file you don't have.
Category 3: the control panel of a piece of equipment that is purchased separately.
Here are the apps that cause the most confusion because they are legitimate and actually display ultrasound on the phone screen.
The omitted detail is the essential one: they work coupled to a physical transducer, A piezoelectric transducer is a piece of hardware that connects to the device via cable and contains the piezoelectric crystals responsible for emitting and capturing sound. This transducer is a medical device, sold to healthcare professionals and services, with prices in the thousands of reais (Brazilian currency).
The app itself is free in the store — and it's from this loophole that lists of "free ultrasound on your cell phone" are born. Without the device connected, it shows absolutely nothing.
Category 4: pregnancy monitoring
These are the only ones on the list that are worthwhile for pregnant women, and they are precisely the ones that don't promise tests. They track weeks, symptoms, appointments, tests, and weight gain, and explain what happens at each stage.
Why does physics prevent the rest?
In short: the cell phone doesn't have the necessary sensor. Ultrasound requires emitting sound in the megahertz range—millions of cycles per second—and capturing the echo with microsecond precision. The cell phone's speaker and microphone operate in the audible range, which ends around 20,000 cycles per second, and is three orders of magnitude below what is needed.
An app is software: it controls existing sensors. No software update creates a transducer inside the device, just as no app makes the camera see in complete darkness.
Warning signs in a health app
- Promise diagnosis instead of registration or guidance.
- It does not indicate the responsible technician, the institution, or the source of the information.
- It requests permissions that are unrelated to the function, such as contact list or SMS.
- It displays an immediate result without asking for any data to justify that result.
- Recent assessments suggest an unexpected charge or a random result.
- It's in the Entertainment category, but the ad text mentions health.
A practical test: install, use twice in a row under the same conditions, and compare. The simulation application returns images that do not hold up between measurements.
The real way to take the exam
In Brazil, prenatal care is free through the Unified Health System (SUS), and obstetric ultrasound is part of this care. The request for this ultrasound comes from a consultation with the healthcare professional monitoring the pregnancy. The starting point is the primary healthcare unit closest to your home.
It's important to emphasize one point: the ultrasound isn't just for seeing the baby. It assesses gestational age, placental position, amniotic fluid, and growth—information that changes the course of prenatal care. Replacing it with an image from an app isn't saving money, it's risky.
If the pregnancy is already being monitored and the concern is about a symptom, the advice remains the same as always: talk to the team that is monitoring you. No app, not even the good ones, can answer that.
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How do these apps make money from you?
A program that doesn't deliver functionality needs to monetize attention, and the ways to do this are well-known. The most common is the volume of advertising: full-screen ads between screens, mandatory videos to "unlock" the image, permanent banners. Each view is worth fractions of a cent, which is why the interface is designed so that you tap many times without getting anywhere.
The second is signing up by mistake. The opening screen offers a free trial, the decline button is discreet, and billing begins within a few days, renewing automatically. Since the amount is usually low, the bill goes unnoticed for months. It's worth repeating: uninstalling the app doesn't cancel anything, because the subscription remains in the store's account, not on the device.
What to check on the store's listing before installing
- Developer name and backgroundTap on the name and view the portfolio. Dozens of unrelated apps, published in a short period of time, is standard advertising factory behavior.
- Data Security SectionApp stores require developers to declare what they collect and whether they share it. An empty declaration in an ad-filled app is a contradiction.
- Last updated dateAbandoned app accumulates security flaws and disappears from support.
- Permissions listedCompare this to the promised function. There's no reason for a viewer to request SMS, contacts, or calls.
None of these signs is proof on its own, but the combination of three or more practically ends the discussion. And there's one criterion that makes the others unnecessary: if the description promises that the cell phone will generate an image of the inside of the body, you already know it's fake, because the device lacks the transducer that emits and receives ultrasound and the gel that allows this wave to penetrate the skin.
Step-by-step instructions for cleaning the device after installing one of these.
- 1. Uninstall the app, but don't stop there.
- 2. Open your store account and check the list of active subscriptions; cancel any you don't recognize and request a refund if the charge is recent.
- 3. In the privacy settings, review the permissions granted and revoke anything that doesn't make sense.
- 4. On Android, run a scan with Google Play Protect; on both systems, check that no configuration profiles or administration applications remain installed.
- 5. Reset the advertising identifier in the settings to break the profile that was created.
This cleanup takes half an hour and resolves what really affects those who installed it: recurring charges and data profiles. There's no reason to panic about the device itself — the problem with these apps is rarely infecting the phone, but rather extracting value from those who were vulnerable and seeking help.
What Android and iPhone already offer in this area.
Both platforms offer granular permission control, with the option to grant access only while the application is open and automatically revoke access that has been inactive for too long. Both display a visual indicator when the camera or microphone is activated, immediately revealing an application activating a sensor without reason.
Each system's app store centralizes payments, which is an advantage: the subscription list is all in one place, cancellation takes two taps, and there's a refund request channel. For pregnancy management, the system's health app, calendar with reminders, and notepad cover almost everything a third-party app would—without advertising and without registration.
Frequently asked questions about apps that promise exams.
Existe algum aplicativo que gere imagem do bebê pelo celular?
It doesn't exist and it's not a matter of time. The image depends on emitting ultrasound and capturing the echo, and this requires a piezoelectric transducer placed against the abdomen with gel. The cell phone does not emit in that range nor does it have a receiver for the return.
Cancelei a assinatura e continuei sendo cobrado. O que faço?
Check if the cancellation appears in the store's subscription list, because canceling within the app sometimes doesn't work. If the problem persists, use the store's support channel to dispute it, and if the charge is deemed incorrect, filing a complaint with a consumer protection agency is the next step.
Como faço o ultrassom de verdade sem pagar?
Through the SUS (Brazilian Public Health System) prenatal care, starting at the basic health unit in your area. Follow-up appointments, routine exams, and referrals for imaging are included in the service and are free of charge.
