Keeper (2025) is a folk-horror slow burn directed by Osgood Perkins, a filmmaker known for atmospheric dread and unsettling imagery. If his name sounds familiar, you’ve likely seen our FearScale results for Longlegs and The Monkey, both of which delivered far more consistent physiological responses.

For this monitoring session, we recruited a test subject who experiences autophobia, the fear of being alone, making Keeper’s isolated setting an ideal candidate for elevated fear responses.

SYNOPSIS:

A romantic anniversary trip to a secluded cabin turns sinister when a dark presence reveals itself, forcing a couple to confront the property’s haunting past.

FearScale Methodology

FearScale measures how frightening a horror film truly is by monitoring real-time heart rate data from human test subjects during controlled viewing sessions. Each subject’s baseline resting heart rate is recorded prior to the film, allowing us to identify meaningful spikes caused by tension, dread, shock, or sustained unease.

Heart rate increases are tracked throughout the runtime and correlated with specific scenes to determine when fear responses occur—and how intense they are. This data-driven approach helps separate genuine physiological reactions from subjective opinions or post-viewing impressions.

Because fear is personal, FearScale does not claim universal results. Instead, each session offers an objective snapshot of how a film impacts the human body under consistent conditions, providing a unique, measurable lens on horror.

Viewing Conditions:

The film was viewed uninterrupted in a controlled, low-distraction environment. Our subject was familiar with the folk-horror genre but had no prior knowledge of Keeper’s plot or imagery. Heart rate data was continuously monitored from opening frame to final scene and compared against her baseline average.

Where We Monitored: At Home

Test Subject: Maria

Age: 32

Gender: Female

Fears: Autophobia or the fear of being alone

Resting HR: 60-65bpm

Walking HR: 80-85bpm

ANALYSIS:

The film opens with a visceral, bloody title sequence that creates an immediate emotional pull. While the moment was too brief to capture usable heart-rate data, it successfully spiked our subject’s attention and set early expectations.

The story then shifts to a familiar setup: a couple retreats to a secluded cabin deep in the woods. For roughly the first twenty minutes, heart rate remained stable, suggesting engagement without tension. The pacing during this stretch introduced atmosphere but failed to escalate fear.

Several extremely slow-moving scenes followed. A few managed to generate mild tension, but not enough to budge the needle. Odd cutaways teased possible threats: a poisoned chocolate cake, a massive haunted fish, or perhaps some unidentified land creature. By this point, our subject wasn’t frightened, just confused.

At the 50-minute mark, a quiet stalking scene finally raised her heart rate to 80 BPM. This was quickly followed by the film’s peak of 91 BPM, triggered by an everyday moment that would make even the calmest viewer squirm. (Pro tip: never stick your hand in there.)

The primary threat does not fully emerge until over an hour into the runtime. As the narrative slowly clarifies, heart rate levels settled just above baseline, only increasing again during the surreal and chaotic finale. While visually striking, these final moments produced short-lived spikes rather than sustained fear.

Fear Profile Summary

• Baseline Average: Stable 60-65BPM
• First Notable Spike: 50 minutes (stalking sequence) 80BPM
• Peak Heart Rate: 91 BPM (everyday discomfort moment)
• Sustained Tension: Minimal
• Late-Act Response: Moderate, inconsistent

CONCLUSION:

Keeper (2025) is an intentionally strange and deliberately paced folk-horror film that prioritizes mood over momentum. While it eventually delivers striking creature effects and unsettling imagery worthy of nightmare-fuel consideration, the slow build struggles to maintain engagement long enough to generate consistent fear responses.

For FearScale purposes, a few isolated spikes do not qualify as a heart-racing experience. Viewers who appreciate abstract storytelling and visual weirdness may find value here, but those seeking sustained tension will likely find their pulse waiting patiently.

Keeper (2025) : Burns an average of 191 Calories

A piece of chocolate cake : 352 Calories

More FearScale Results

• Osgood Perkins on FearScale: Longlegs (Heart Rate Breakdown)

• Osgood Perkins on FearScale: The Monkey (Fear Profile & Peak BPM)

How many Fear Calories did you burn watching Keeper (2025) ?  Let us know in the comments below or on Instagram, and Facebook