Do Brain Training Apps Work? What the Research Says

Do brain training apps work?

Brain training apps, also called brain games, make you better at the games in the app, but the best evidence finds little or no improvement in general intelligence or everyday performance. The first part is not in dispute. The question people actually mean is whether a few minutes of memory or attention games a day makes you sharper at everything else: work, conversation, remembering where you parked.

The distinction researchers use is transfer:

• Near transfer means getting better at tasks very close to the one you practiced. Train on one memory game, and you improve on a slightly different memory game.
• Far transfer means getting better at something quite different, such as general reasoning, school results or everyday functioning.

Brain training apps are sold on far transfer. The research mostly finds near transfer.

What does the research say?

The largest reviews find that brain training improves the trained tasks, sometimes improves very similar tasks, and rarely improves anything else; that is the conclusion of a 2016 review of the evidence in Psychological Science in the Public Interest and of the meta-analyses that followed it.

The debate came to a head in October 2014, when the Stanford Center on Longevity and the Max Planck Institute for Human Development issued a statement signed by a large group of cognitive scientists. Its conclusion: "claims promoting brain games are frequently exaggerated and at times misleading," and "there is little evidence that playing brain games improves underlying broad cognitive abilities."

In an open letter, well over 100 neuroscientists, psychologists and other experts replied. They agreed that marketing was often exaggerated, but argued that some specific, well-tested programs do show benefits, and pointed to dozens of randomized controlled trials to make the case.

That disagreement prompted the most thorough review to date. In 2016, seven researchers led by the psychologist Daniel Simons examined the evidence, including the studies the response letter cited. They found "extensive evidence that brain-training interventions improve performance on the trained tasks," less evidence for closely related tasks, and little evidence for distantly related tasks or everyday performance. They also found that many studies had design flaws that made firm conclusions impossible.

Later meta-analyses, which pool results across many studies, point the same way:

Why don't brain games make you smarter in general?

Brain games don't make you smarter in general because skills are specific: practicing a task builds the knowledge and strategies that task needs, and those don't automatically carry over to a different task, even one that seems to use the same "mental muscle."

Study design matters too. Reviews found that apparent far-transfer effects shrink or disappear when trainees are compared with an active control group, people doing some other engaging activity, rather than with people who did nothing. That pattern suggests much of the apparent benefit comes from expectation and engagement, not from the training itself (Melby-Lervåg et al., 2016; Sala et al., 2019).

What about the studies that found benefits?

The strongest positive evidence comes from the ACTIVE trial, in which older adults' gains in reasoning and processing speed were still measurable 10 years later; it does not show that brain games raise general intelligence.

The ACTIVE trial (Advanced Cognitive Training for Independent and Vital Elderly) began in the late 1990s and randomized 2,832 adults aged 65 to 94 to ten sessions of memory, reasoning or speed-of-processing training, or to no training (Ball et al., 2002, JAMA). Each group improved on the ability it trained. At two years, the researchers detected no effect on everyday functioning.

At ten years, the reasoning and speed groups still outperformed controls on the abilities they had trained, and all three training groups reported less difficulty with daily tasks than the control group (Rebok et al., 2014). That measure was self-reported, and only 44% of the original participants were followed up.

In February 2026, researchers linked ACTIVE participants to Medicare records from 1999 to 2019 (Coe et al., 2026). The analysis covered the 2,021 participants enrolled in traditional Medicare at the start. Participants who did speed training and completed at least one booster session were diagnosed with dementia less often than controls. Speed training without boosters showed no difference, and neither did memory or reasoning training, with or without boosters. Diagnoses came from billing records rather than clinical assessment.

Three things are worth keeping in mind about these results:

1. They come from one specific, supervised speed-of-processing exercise in older adults, not from brain training apps in general.
2. The benefit in the 20-year analysis appeared only in one subgroup, and the mechanism is not understood.
3. None of it shows that a game raises general intelligence in healthy adults.

The World Health Organization's 2026 guidelines reflect this balance. They say cognitive training "may be offered to older adults with normal cognition or mild cognitive impairment," a conditional recommendation based on low-certainty evidence (full recommendations).

Does Lumosity work?

Lumosity's games make you better at Lumosity's games, but in 2016 the U.S. Federal Trade Commission (FTC) charged that the company's advertising claimed benefits it couldn't support, and Lumos Labs, the company behind Lumosity, paid $2 million to settle. In January 2016, the FTC announced the settlement; a $50 million judgment was suspended because of the company's finances.

The FTC charged that the company lacked scientific support for claims that its games:

• improved performance at work, at school and in sports;
• delayed age-related cognitive decline and protected against dementia and Alzheimer's disease;
• reduced cognitive impairment linked to conditions such as stroke, brain injury and ADHD.

"Lumosity simply did not have the science to back up its ads," said Jessica Rich, then director of the FTC's Bureau of Consumer Protection. The case was about the claims, not the puzzles. The settlement covered Lumosity's advertising up to 2016; this article doesn't assess the company's current claims.

Can brain games or apps improve your memory?

Apps can improve your memory for specific material you practice, such as vocabulary, dates or formulas, but current evidence doesn't show that brain games increase your general memory capacity.

Two findings explain the difference:

• Working-memory training improves working-memory tasks for a while but doesn't reliably carry over to reading, arithmetic or reasoning (Melby-Lervåg et al., 2016).
• Retrieval practice, testing yourself on what you're learning, makes that material stick. In a classic experiment, students who repeatedly restudied a passage did better on a test five minutes later, but students who tested themselves remembered more a week later (Roediger & Karpicke, 2006). A major review rated practice testing and spaced practice as the two most useful study techniques it examined (Dunlosky et al., 2013).

So an app that quizzes you on vocabulary, dates or formulas over time will help you remember vocabulary, dates and formulas. That's a real benefit. It's just specific.

What actually keeps your mind sharp?

For protecting your thinking as you age, physical activity has the strongest backing of the options here: the WHO's 2026 guidelines strongly recommend it, on moderate-certainty evidence, for adults with normal cognition, while cognitive training gets only a conditional recommendation based on low-certainty evidence.

Here's how the main options compare:

The thread running through the research is that what you practice is what you get better at. If you want to be better at mental math, do mental math. If you want to understand history, work through hard history questions. Choose challenges that are hard enough to require effort and specific enough to build something you'll use.

This article is general information, not medical advice. If you're worried about your memory or thinking, talk to a doctor.

How can you tell if a brain training app's claims are honest?

A brain training app's claims are honest when they name the specific skill you'll improve, claim no more than the evidence for that product supports, and avoid promises about IQ, work performance or medical conditions. A few questions sort honest claims from marketing:

• Does it promise improvement in "everything"? Claims about work, school, IQ or "full potential" are far-transfer claims, the kind the FTC charged were unsupported.
• Does it mention dementia, ADHD or recovery from illness? Those are medical claims. Without clinical evidence for that specific product, they're a red flag.
• Does it cite studies of its own product, against an active control group? General research on "neuroplasticity" doesn't count.
• Does it tell you what you'll actually get better at? An honest app can name the skill.

Where does Moozgy fit?

Moozgy is not a brain training app in the sense this article tests: it's a feed of hard problems in real subjects, designed to build skill in those subjects, with no IQ, memory or medical claim. Moozgy is ours, so here's exactly what we claim and what we don't.

Moozgy is a vertical feed of hard problems in real subjects: math, history, philosophy, economics, geography, computer science and SAT prep. You answer questions at your level, and the app tracks your accuracy and level in each subject and suggests what to work on next.

Based on the research above, here's what that can do: make you better at the subjects you practice. Work through hard math problems and you get better at math. Answer hard history questions over time and you know more history. That's the near-transfer finding, applied to things worth knowing.

We haven't run a controlled study of Moozgy itself. By the test in the previous section, that means you should read our claim narrowly: it rests on the general research on practice, not on evidence about our app, which is why we don't claim more.

Here's what we don't claim: that Moozgy raises your IQ, improves your memory in general, or prevents, treats or measures any medical condition, including cognitive decline. We call it mental fitness, and we mean that the way a gym means fitness: regular, effortful practice at something specific. If you'd rather spend ten minutes on a hard problem than on an endless scroll, that's what we built it for.