Comparison

HemiStim vs Visual Vertical Lite

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HemiStim

This app offers visual stimulation for specific brain lobes, aiding in hemispheric connectivity. It utilizes color patterns and eye-tracking exercises for targeted left or right brain stimulation, controllable via simple taps and swipes. Therapy sessions are automatically tracked and can be emailed to clinicians.

Highlights
  • Visual stimulation of frontal, parietal, occipital, temporal lobes
  • Hemispheric brain stimulation
  • Color pattern selection
  • Eye tracking for saccadic and pursuit movements
  • Adjustable blink rate and timer
  • Automatic therapy session tracking
  • Clinician-patient email communication
Features
Currently charting
Read full description

Hemistim can be used as a visual stimulation of areas of the frontal, parietal, occipital, and temporal lobes hemispherically. It is a specific brain stimulation which is rarely used in conjunction with other treatments but can be used as a portion of a home-based program or an office-based program. Such usage may lead to improved hemispheric connectivity specific, targeted areas of the brain and its connections to the parietal/temporal or frontal cortices. Hemistim provides a visual stimulation through utilizing color patterns and eye tracking that can be used for specific left or right visual exercise. The stimulus is recognized and  interpreted by the contralateral (opposite) occipital lobe. Pursuit and saccadic eye movements are created by targeting on the moving object. Pursuit away from and saccade towards the alternating squares are initiated by the ipsilateral (same side) parietal and frontal cortex, respectively.  This gives the doctor the ability to work the frontal, parietal, occipital, and temporal lobes hemispherically.  HemStim is easy to use. Swipe left or right to select a different colored pattern. Multiple patterns are available. Tap a pattern to make it begin blinking. The pattern will blink until the timer stops it. Double tapping the pattern will also make it stop. The blink rate and timer can be changed using the sliders. Target motion is controlled by the tapping the small target to the right of the speed control. Choose among no motion, saccade, and pursuit by successive taps on the small target. Exterior motion is indicated by purple arrows on the target and interior motion by white arrows. The new Saccades screen only displays target motion. Drag the purple target with one finger to set the direction and length of its motion. Tap the screen once simultaneously with two fingers to switch between saccades, a dashed line, and pursuits, a solid line. Tap the screen once with one finger to start the saccades or pursuits. Double tap the screen with one finger to stop the target motion. HemiStim automatically tracks therapy sessions, recording all pertinent information about each one. Maintain close communication between clinician and patient via email.

About

Visual Vertical Lite

This medical app offers a quick, accurate, and affordable method for measuring subjective visual vertical in patients. It simplifies a previously complex and expensive diagnostic process, making it accessible for neurologists and vestibular rehabilitation specialists.

Highlights
  • Measures subjective visual vertical
  • Accurate and low-cost readings
  • Uses iPhone/iPad for testing
  • Suitable for neurology and vestibular rehab
  • Tests otolithic function
  • Single readings for each eye
Features
Read full description

Visual Vertical Lite makes subjective visual vertical (SVV) testing simple and accessible using equipment you already have. Traditional SVV testing can require specialised equipment and a controlled visual environment. Visual Vertical Lite provides a practical alternative using your iPhone, a bucket and a small piece of Blu Tack. HOW IT WORKS Mount your iPhone inside the bottom of a bucket using Blu Tack. The person being tested holds the bucket to their face and adjusts the line on screen until it appears vertical. Visual Vertical Lite measures the resulting deviation from true vertical and displays the result in degrees. TEST THE WAY YOU NEED Choose from: • Left eye • Right eye • Both eyes open Visual Vertical Lite is designed for quick, individual measurements, making it ideal when you simply need to perform a one-off SVV test. SIMPLE RESULTS Results are presented immediately in a clean, easy-to-read format, including the measured deviation and direction. BUILT-IN GUIDANCE Not familiar with the bucket method? The included guide walks you through equipment setup, positioning, testing and interpretation of the results. LITE OR FULL? Visual Vertical Lite includes the core functionality required to perform individual SVV tests. For sequential testing, multiple readings and automatic averaging across test conditions, choose the full Visual Vertical app. UPDATED FOR MODERN iOS Visual Vertical Lite has been comprehensively updated with a redesigned interface, clearer navigation and support for current versions of iOS.

Screenshots

HemiStim3 screens
Visual Vertical Lite4 screens

Verdict

The call

The clearest difference is rating: HemiStim at 2.4 against Visual Vertical Lite's 2.0. HemiStim also leads on update cadence (every 8 months vs every 42 months) and chart position (#196 vs unranked). Visual Vertical Lite's advantage is price ($5.99 vs $9.99). On ads, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

HemiStim costs $9.99 and Visual Vertical Lite $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

HemiStim holds the better App Store score, 2.4 against 2.0. That said, the two scores are not equally well evidenced: HemiStim has 5 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

HemiStim ships an update every 8 months, Visual Vertical Lite every 42 months. The most recent releases landed on September 14, 2026 and September 24, 2026 respectively.

Scorecard7 real differences · 4 level
HemiStim versus Visual Vertical Lite: the parameters behind the verdict, then further details
ParameterHemiStimVisual Vertical Lite
Price$9.99$5.99 — better
Rating2.4 (5 ratings) — better2.0 (1 ratings)
Positive reviews37.5% of reviews
Number of ratings5 — better1
Update frequencyEvery 8 months — betterEvery 42 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank#196 — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12.0 — better16.0
Further details — not scored
Size1 MB6 MB
Age rating4+4+
DeveloperLinsay Associates, LLCClear Health Media

Customer experience

HemiStim

All ratings5 ratings
Positive40.0%
Neutral0.0%
Negative60.0%
Written reviews8 reviews
Positive37.5%
Neutral12.5%
Negative50.0%

Visual Vertical Lite

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

HemiStim

No in-app purchases

None

Visual Vertical Lite

No in-app purchases

Questions

Is HemiStim free?
HemiStim costs $9.99, with no in-app purchases.
Is Visual Vertical Lite free?
Visual Vertical Lite costs $5.99, with no in-app purchases.
Which has better reviews, HemiStim or Visual Vertical Lite?
HemiStim is rated higher. HemiStim averages 2.4 out of 5 from 5 ratings, while Visual Vertical Lite averages 2.0 from 1 ratings.
Do HemiStim or Visual Vertical Lite have ads?
Neither HemiStim nor Visual Vertical Lite shows ads.
Which is updated more often, HemiStim or Visual Vertical Lite?
HemiStim ships an update every 8 months, and Visual Vertical Lite every 42 months. Most recently, HemiStim was updated on September 14, 2026 and Visual Vertical Lite on September 24, 2026.

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