Comparison

HemiStim vs Reflex

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

Reflex

This tool measures and tracks pupillary activity using an iPhone camera for quick, 5-second tests. It helps medical professionals monitor patient progress and identify deviations for clinical decision support.

Highlights
  • Pupillary readings via iPhone camera
  • 5-second test duration
  • Patient progress tracking
  • Baseline feature for deviations
  • Clinical decision support tool
  • Rapid biomarker validation
Features
Read full description

Measure and track autonomic pupillary activity by simply holding the iPhone up to your patient's eye for a quick 5-second test. Track patient progress using the baseline feature and frequently follow-up to determine deviations with Reflex, an accessible pupillary tool for clinical decision support. Here's what you can expect from Reflex: -Fast and reliable pupillary readings at the touch of a screen. -Track important changes and fluctuations from pupil readings over time. -Validate your clinical efforts with the state-of-the-art in rapid biomarkers. Reflex is only for medical professional use. Seek a physician's advice if you're experiencing ocular or neurological issues. Pricing & Terms: Reflex offers the following subscription option for unlimited use per period: * 1 month: $39.99 (USD) * 1 year: $399.99 (USD) This price applies to United States residents. Prices may vary in other countries respecting your local currency exchange rate. Your subscription will be charged to your iTunes account. At the end of the term, unless auto-renewables subscriptions are disabled, your subscription will automatically renew in your iTunes account. You will be charged for the regular price of your subscription within 24 hours prior to the end of the current term. You can turn off automatic renewal in your iTunes account settings at any time, but you must do so at least 24 hours before the end of the current term. Refunds will not be provided for the unused portion of any term. Reflex is a registered Class I 510(K) Exempt medical device. Privacy policy: https://reflexapp.io/privacy-policy/ Terms and conditions: https://reflexapp.io/terms-conditions

Screenshots

HemiStim3 screens
Reflex3 screens

Verdict

The call

The clearest difference is price: Reflex at Free against HemiStim's $9.99. Reflex also leads on rating (3.5 vs 2.4) and update cadence (every 2 weeks vs every 8 months). HemiStim's advantage is review sentiment (38% vs 0%) and in-app purchases (none vs 5). On ads 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

Reflex is free to download; HemiStim costs $9.99 up front. Reflex sells 5 in-app purchases, starting at $1.99 per month. HemiStim asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Reflex holds the better App Store score, 3.5 against 2.4. Both are backed by a comparable volume of ratings — 5 and 23 respectively. Written reviews complicate that: 38% of HemiStim's written reviews are positive against 0% of Reflex's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

HemiStim ships an update every 8 months, Reflex every 2 weeks. The most recent releases landed on September 14, 2026 and September 10, 2026 respectively.

Scorecard10 real differences · 1 level
HemiStim versus Reflex: the parameters behind the verdict, then further details
ParameterHemiStimReflex
Price$9.99Free — better
Rating2.4 (5 ratings)3.5 (23 ratings) — better
Positive reviews37.5% of reviews — better0.0% of reviews
Number of ratings523 — better
Update frequencyEvery 8 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid — betterSubscription
Best chart rank#196 — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12.0 — better17.6
Further details — not scored
Size1 MB22 MB
Age rating4++17
DeveloperLinsay Associates, LLCBrightlamp, Inc.

Customer experience

HemiStim

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

Reflex

All ratings23 ratings
Positive60.9%
Neutral4.3%
Negative34.8%
Written reviews4 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

HemiStim

No in-app purchases

5 purchases

Reflex

Subscriptions5
  • Critical Care Monthly$1.991 Month
  • Monthly Subscription1 Month trial$41.991 Month
  • Monthly Subscription$41.991 Month
Show 2 more
  • Yearly Subscription1 Month trial$419.991 Year
  • Yearly Subscription$419.991 Year

Questions

Is HemiStim free?
HemiStim costs $9.99, with no in-app purchases.
Is Reflex free?
Reflex is free to download, with in-app purchases available.
Which has better reviews, HemiStim or Reflex?
Reflex is rated higher. HemiStim averages 2.4 out of 5 from 5 ratings, while Reflex averages 3.5 from 23 ratings.
Do HemiStim or Reflex have ads?
Neither HemiStim nor Reflex shows ads.
Which is updated more often, HemiStim or Reflex?
HemiStim ships an update every 8 months, and Reflex every 2 weeks. Most recently, HemiStim was updated on September 14, 2026 and Reflex on September 10, 2026.

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