Does grayscale really reduce screen time? What the studies measured

Last updated: 4 October 2026

Yes. In a randomised field experiment with 112 university students, grayscale mode cut screen time by 17.6%, even though the participants only had it switched on about half the time. Across several controlled studies, grayscale reduced screen time by roughly 7 to 18%, which works out at 20 to 50 minutes a day. A short breathing pause before an app opens works at a second point: in one study over six weeks, 36% of all attempts to open an app were cancelled, and by the end participants tried to open those apps 37% less often. InstaDetox uses exactly these two mechanisms.

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The short answer: yes, at two points
All the studies at a glance
Grayscale: the studies in detail
The breathing pause: what a short moment before opening does
Why it works
What this means for you
How long it takes
How InstaDetox puts both effects on your phone

The short answer: yes, at two points

Grayscale and the breathing pause act at different points. Dekker and Baumgartner (2024) show this most clearly. They automatically logged every bit of phone use from 84 people. In the grayscale week, screen time went down, but the number of pickups stayed the same. People reached for their phones just as often; they simply put them down sooner.

The breathing pause sits one step earlier, at the moment you reach for the app. That lets you break the dopamine loop at both ends: less reward in the feed and fewer launches on autopilot. The strongest results from each side:

Grayscale: 17.6% less screen time than the control group (Zimmermann & Sobolev, 2023) and 11.1% less in visual apps such as social media, video and games (Dekker & Baumgartner, 2024).
Breathing pause: 36% of attempts to open an app cancelled, 43% in the first week, and 37% fewer attempts after six weeks (Grüning, Riedel & Lorenz-Spreen, 2023).
Other small hurdles before opening: 26.8% fewer opens and 25.4% less time spent (Xu et al., 2022), and in another study only half as many opens (Kim et al., 2019).

All the studies at a glance

“Relative” here means compared with the control group or with the same people's own baseline, depending on how the study was set up. The details of each study follow further down.

Grayscale

Study	What was tested	Relative result	Absolute result
Zimmermann & Sobolev (2023), Cyberpsychology, Behavior, and Social Networking DOI: 10.1089/cyber.2022.0027	Grayscale compared with a control group and time limits, randomised, 112 students, about three weeks	17.6% less screen time than the control group	about 50 min a day (233 instead of 283 min)
Hagerty et al. (2026), Frontiers in Digital Health DOI: 10.3389/fdgth.2026.1816095	one week each in grayscale and in colour, 51 medical students	8.2% less screen time	about 28 min a day (319 instead of 347 min)
Dekker & Baumgartner (2024), Mobile Media & Communication DOI: 10.1177/20501579231212062	one normal week, then one week in grayscale, 84 Android users	6.9% less overall, 11.1% less in visual apps	about 20 min a day (287 down to 268 min)
Holte & Ferraro (2020), The Social Science Journal DOI: 10.1080/03623319.2020.1737461	grayscale for 8 to 10 days, 73 of 161 students	no percentage reported	37.9 min a day less than at the start
Holte, Giesen & Ferraro (2023), Current Psychology DOI: 10.1007/s12144-021-02020-y	grayscale, 133 students	no percentage reported	about 22 min a day less
Olson et al. (2022), International Journal of Mental Health and Addiction DOI: 10.1007/s11469-022-00826-w	a bundle of small hurdles including grayscale, randomised, 70 students, two weeks	23% less screen time (control group: 3%)	57 min a day (4.1 down to 3.2 hours)

Breathing pause and other hurdles before opening

Study	What was tested	Result
Grüning, Riedel & Lorenz-Spreen (2023), PNAS DOI: 10.1073/pnas.2213114120	a short breathing exercise with the option to cancel before an app opens; 280 people, six weeks	36% of attempts to open an app cancelled (first week: 43%); in week six, 37% fewer attempts than in week one (105 instead of 166)
Mertens et al. (2026), JMIR mHealth and uHealth DOI: 10.2196/56824	a reminder filling the screen once people passed their own time limit, with a choice between closing and carrying on; randomised, 70 iPhone users	30% less time in the most problematic app after the intervention week, 40% by week three (77 down to 46 min a day)
Xu et al. (2022), CHI Conference on Human Factors in Computing Systems DOI: 10.1145/3491102.3517476	typing an encouraging sentence before chosen apps launch; 54 people, ten weeks	26.8% fewer opens, 25.4% less time spent
Kim et al. (2019), CHI Conference on Human Factors in Computing Systems DOI: 10.1145/3290605.3300927	a small task before opening chosen apps; 40 Android users	opens cut in half (to 50.5%)
Okeke et al. (2018), MobileHCI '18 DOI: 10.1145/3229434.3229463	a gentle vibration after going over the limit; randomised field experiment	about 23% less time on Facebook
Lyngs et al. (2020), CHI Conference on Human Factors in Computing Systems DOI: 10.1145/3313831.3376672	reminders of personal goals, Facebook on a laptop; 58 students	45% less time, 64% fewer visits (median)

Grayscale: the studies in detail

The studies differ in length and design, and each one recruited different people. The result is the same in all of them: with grayscale, screen time goes down.

Zimmermann & Sobolev (2023): 17.6% less, with the filter on only half the time

112 students, randomly split into three groups, for about three weeks. The first group only tracked their screen time, the second switched their phones to grayscale and the third set their own time limits. Usage was measured objectively on the phone itself, not with a questionnaire.

The grayscale group came in 17.6% below the control group, about 50 minutes a day (233 instead of 283 minutes). The effect kicked in straight away and held steady. On top of that, participants only had grayscale switched on about half the time (46.5%), which is why the authors call their result a conservative estimate.

Before the study, participants rated grayscale as the weakest of the three methods. By the end it was the most effective. The time limits people set for themselves did not bring screen time significantly below the control group; their effect only built up slowly over time. And simply tracking your own screen time changed nothing about how much people used their phones.

Source: Zimmermann & Sobolev (2023), Cyberpsychology, Behavior, and Social Networking 26(1). DOI: 10.1089/cyber.2022.0027

Hagerty et al. (2026): 8.2% less in a single week

51 medical students spent one week in grayscale and one week in colour, so each person served as their own comparison. In the grayscale week, screen time was 8.2% lower, about 28 minutes a day (319 instead of 347 minutes). The difference is statistically significant.

The study also shows how high the starting point is: in the colour week, these future doctors averaged just under six hours of screen time a day.

Source: Hagerty et al. (2026), Frontiers in Digital Health 8. DOI: 10.3389/fdgth.2026.1816095

Dekker & Baumgartner (2024): shorter sessions, more control

Phone use from 84 Android users was logged automatically: one normal week, then one week in grayscale. Overall screen time fell by 6.9%, about 20 minutes a day (287 down to 268 minutes). In visual apps, meaning social media, video and games, where colour pulls hardest, the drop was 11.1% (146 down to 130 minutes).

How people felt changed as well. Participants reported significantly more control over their phone use and felt less stressed. They also had the sense less often that they had spent longer on the phone than planned.

Only the number of pickups stayed the same. Grayscale made sessions shorter, but it did not change the reach for the phone itself. That is exactly what the breathing pause in InstaDetox is for.

Source: Dekker & Baumgartner (2024), Mobile Media & Communication 12(3). DOI: 10.1177/20501579231212062

Holte & Ferraro (2020 and 2023): 22 to 38 minutes a day

Two studies with university students. In the first, 73 of 161 participants used grayscale for eight to ten days. Afterwards their screen time was on average 37.9 minutes a day below where it started, and social media use and browsing dropped clearly too. In the second study, with Giesen as an additional author and 133 students, the reduction was about 22 minutes a day.

Sources: Holte & Ferraro (2020), The Social Science Journal. DOI: 10.1080/03623319.2020.1737461. Holte, Giesen & Ferraro (2023), Current Psychology 42(8). DOI: 10.1007/s12144-021-02020-y

Olson et al. (2022): 23% less with a bundle of small hurdles

In this randomised controlled trial, 70 students received a bundle of small measures for two weeks in the spirit of self-nudging, including grayscale and notifications turned off. Screen time fell by 23%, from 4.1 to 3.2 hours a day, which is 57 minutes. In the control group the drop was 3%.

That is the effect of the whole bundle, not grayscale alone. But it shows how much is possible when you tackle the habit at several points at once.

Source: Olson et al. (2022), International Journal of Mental Health and Addiction 21(6). DOI: 10.1007/s11469-022-00826-w

Two more studies, same direction

Wickord and Quaiser-Pohl (2023) also found in an experiment that grayscale reduces usage time. Kasturiratna et al. (2025) had 163 young adults go through both conditions in a randomised study: once with a bundle of small hurdles including grayscale, once without. With the bundle, screen time and the number of quick phone checks dropped significantly.

Sources: Wickord & Quaiser-Pohl (2023), Computers in Human Behavior Reports 10. DOI: 10.1016/j.chbr.2023.100294. Kasturiratna et al. (2025), Mobile Media & Communication 13(3). DOI: 10.1177/20501579251323246

The breathing pause: what a short moment before opening does

Grüning, Riedel & Lorenz-Spreen (2023): 36% of opens cancelled

280 people, six weeks, in everyday life. Before a chosen app opened, a short breathing exercise filled the screen, with the option to cancel. More than 80% of the monitored use was social media, and Instagram and Twitter alone accounted for half of it.

36% of all attempts to open an app were cancelled, and in the first week it was as many as 43%. The effect reached beyond the single moment: in week six, participants tried to open the apps 37% less often than in week one (105 instead of 166 attempts).

An accompanying online experiment took apart which element does the work. The strongest was the option to cancel. A plain text message before opening did nothing. A reminder on its own is not enough; you need a moment in which you actually decide.

Source: Grüning, Riedel & Lorenz-Spreen (2023), PNAS 120(8). DOI: 10.1073/pnas.2213114120

Mertens et al. (2026): 40% less time in the toughest app

This randomised controlled trial ran with 70 participants on iPhone and stepped in at a later point. As soon as people went past the time they had set for their most problematic social media app, a reminder filled the screen and offered a choice between closing and carrying on. Time in that app fell by 30% after the intervention week and by 40% by week three, from 77 to 54 and then 46 minutes a day. In the control group it stayed flat after the first week and was even 7% higher in week three.

Source: Mertens et al. (2026), JMIR mHealth and uHealth 14. DOI: 10.2196/56824

Small tasks before opening: Xu et al. and Kim et al.

For ten weeks, Xu et al. (2022) had 54 participants type a short encouraging sentence about themselves whenever they launched chosen apps. Those apps were opened 26.8% less often and used 25.4% less than in the baseline week. In more than half of the interruptions, participants did not open the app at all afterwards.

In Kim et al. (2019), a small task before opening was enough for 40 Android users to open the chosen apps only half as often.

Sources: Xu et al. (2022), CHI Conference on Human Factors in Computing Systems. DOI: 10.1145/3491102.3517476. Kim et al. (2019), CHI Conference on Human Factors in Computing Systems. DOI: 10.1145/3290605.3300927

Why it works

Feeds are built on reward. Bold colours and red dots for anything new draw you in, and the images never stop moving. Every new image is a small reward, and because you never know whether the next one will be better, you keep swiping. That is the dopamine loop that turns a quick glance into half an hour of doomscrolling. You only wanted to see who replied to you, and twenty minutes later you are watching Reels from people you have never met.

Grayscale strips the colour out of the reward. The content stays the same but looks plain, almost like a printout on paper. Swiping on pays off less, and you put the phone down sooner. That matches exactly what Dekker and Baumgartner measured: just as many pickups, but shorter sessions.

The breathing pause goes after the trigger. For many people, reaching for Instagram is a phone habit that runs without any intention at all: thumb, icon, feed. A few seconds of breathing are enough to turn the reflex into a conscious decision. That makes it work like a firewall for your brain. What you really want gets through, and the reflex gets stuck.

Researchers call this principle design friction: a small, deliberate bit of resistance exactly where everything otherwise runs on autopilot. It is part of digital nudging, meaning small prompts in digital environments that steer a decision in one direction without banning anything. A randomised field experiment shows how little it takes: a gentle vibration after people went over their own limit cut daily time on Facebook by about 23% compared with the baseline week (Okeke et al., 2018, MobileHCI '18; DOI: 10.1145/3229434.3229463).

When you choose these prompts yourself, it is called self-nudging. Lyngs et al. tested this with 58 students: reminders of their own goals cut daily time on Facebook on a laptop by 45% and the number of visits by 64% (both medians; Lyngs et al., 2020, CHI Conference on Human Factors in Computing Systems; DOI: 10.1145/3313831.3376672). With InstaDetox you set these prompts yourself, for exactly the apps that pull you in.

An app blocker works differently. It forbids, and bans invite you to get around them. Friction forbids nothing. You can open any app, just not on autopilot any more.

What this means for you

Percentages translate straight into your day. Android shows your current screen time under Digital Wellbeing. The table works with two measured values: 8.2% from Hagerty et al. and 17.6% from Zimmermann and Sobolev.

Screen time a day	8.2% less per day	17.6% less per day	17.6% over a year
2 hours	about 10 min	about 21 min	about 128 hours
3 hours	about 15 min	about 32 min	about 193 hours
4 hours	about 20 min	about 42 min	about 257 hours

At three hours a day, 17.6% comes to about 32 minutes. Over a year that adds up to more than 190 hours, around eight full days. Even with the smallest grayscale figure from the studies, 6.9% in Dekker and Baumgartner, three hours a day still wins you back about twelve minutes a day and just over 75 hours a year.

If Instagram, TikTok or YouTube are what really hook you, the figure for visual apps fits better: 11.1% in Dekker and Baumgartner. At two hours a day in those apps, that is just over 13 minutes a day.

The breathing pause works at a different point, so you count it separately. In the study by Grüning and colleagues, 36% of attempts to open an app were cancelled. If you reach for the app 20 times a day, that is about seven times you never even land in the feed.

How long it takes

Grayscale works immediately. In Zimmermann and Sobolev the effect kicked in straight away and held steady for the whole study. Unlearning the reach itself takes longer.

Reaching for Instagram is an ingrained, unconscious habit. Unlearning it takes a few weeks. That is normal and no sign that it isn't working. Studies on habit formation measure a little over two months on average before a new behaviour runs automatically. Lally et al. (2010) found a median of 66 days across 96 participants, with a range of 18 to 254 days. A review of 20 studies with 2,601 participants landed on a median of 59 to 66 days, with individual times between 4 and 335 days (Singh et al., 2024).

Two findings from Lally's study help you stick with it. Missing a day did not set progress back in any meaningful way. And the biggest gains came early on.

Hurdles before opening show the same pattern. In the study by Grüning and colleagues, attempts to open the apps kept falling across all six weeks. Haliburton et al. (2024) analysed 1.3 million intercepted attempts to open apps from 1,039 users of an app that adds a hurdle before opening. The attempts dropped clearly over the weeks, most sharply at first and then more gently.

So give it a few weeks. In the first days your thumb will still look for the old shortcut. After that you will notice the phone stays on the table more often, without you having to force yourself.

Sources: Lally et al. (2010), European Journal of Social Psychology 40(6). DOI: 10.1002/ejsp.674. Singh et al. (2024), Healthcare 12(23). DOI: 10.3390/healthcare12232488. Haliburton et al. (2024), CHI Conference on Human Factors in Computing Systems. DOI: 10.1145/3613904.3642370

How InstaDetox puts both effects on your phone

InstaDetox uses exactly these two mechanisms and switches them on only where you want them.

The grayscale filter shows your whole screen in true grayscale as soon as an app you picked is in the foreground. Leave the app and the colour comes back. Maps, camera and photos stay in colour.
The breathing pause appears before a chosen app opens and asks: open it, or cancel? You decide how long it lasts and how fast you breathe, and you can add a grace period for quick switches.
A daily limit of colour time gives you colour back minute by minute when you really need it.

That removes the weak spot Zimmermann and Sobolev describe: in their study, grayscale mode ran only about half the time. With InstaDetox the filter runs every time a chosen app is open, and only then, without you having to think about it. Nothing gets blocked. Every app stays within reach; it just loses its pull.

With InstaDetox you open your time sinks less often, and when you do, you put the phone down sooner. Your screen time drops noticeably, and you win back time every single day.

Grayscale (system) needs setting up once: on Android 11 and newer you are guided through it right on your phone, on Android 8 to 10 you do it once with a computer. The setup video shows every step. You can try Grayscale (system) and the Breathing pause free for 14 days each, with no payment details, counted from the first time you actually use each feature. Grayscale (overlay) and Your stats stay free for good. Everything else is on What InstaDetox does.