Comparison

NXTSTIM vs HFX

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

Head to head
About

NXTSTIM

This app offers AI-powered pain relief and therapy through a connected medical device. It provides personalized treatment plans for pain, strengthening, and relaxation, with features for tracking and optimizing your recovery. Consult a doctor before use.

Highlights
  • AI-powered pain relief
  • Personalized therapy procedures
  • Pain relief, strengthening, and relaxation
  • Outcome-oriented therapy experience
  • Personalized therapy tracking
  • Multiple device therapy support
Features
Read full description

NXTSTIM is a cutting edge therapeutic solution for the optimal pain relief outcome powered by proprietary and proven AI technology. The NXTSTIM App needs to work with FDA cleared NXTSTIM medical device UPK-GE01 with the brand of EcoAI. The App provides personalized pain therapy procedure with comprehensive pain relief, strengthening and relaxation to suit your particular condition. The therapy procedure is made to be the best outcome-oriented therapy experience, driven by a close-loop process with personalized therapy tracking, reminding, periodic review and continuous optimization. It makes therapy much easier, simpler and more enjoyable. It also support multiple device therapy on multiple pain spots on the body. Please be reminded to seek a doctor’s advice first before making any medical decisions including the use of this app and the EcoAI medical device.

About

HFX

Manage chronic pain with personalized relief. This app pairs with a spinal cord stimulator to learn your pain patterns and deliver tailored therapy. It offers features like progress tracking, favorite program saving, and proactive patient support.

Highlights
  • Personalized pain relief recommendations
  • Proactive patient support
  • Save favorite therapy programs
  • Track pain relief progress
  • Earn achievement badges
  • Check device battery level
  • Enable MRI Mode
Read full description

There's now a better way to manage your chronic pain. The HFX App pairs with the Nevro HFX iQ spinal cord stimulator to learn from your unique pain and deliver personalized pain relief from your smartphone. Join over 100,000 people who have been treated with HFX therapy. The HFX App is easy to use:   1. You complete simple check-ins  2. HFX iQ learns from your unique pain experience  3. Get your personalized recommendation  With the HFX App you can:   Get continuous pain relief.   HFX iQ will learn from your inputs, preferences, and unique pain experience to deliver personalized pain relief.   Receive proactive patient support within 24 hours. The HFX App will send alerts to your Nevro Care Team so they can proactively reach out to provide support when you need it.    Save your favorite programs.  Bookmark your favorite programs that you like to use or want to easily return to. You can personalize your favorites by giving it a name like “walking” and selecting a color.  Track your progress.  Better understand your pain level trends, review your relief over time, and how your pain responded to past programs.   Earn badges.  Collect badges as you complete goals, achieve more pain relief, or reach a milestone.   Check your battery level.  Your battery level is conveniently displayed on your Home screen. When your battery is low or empty, you will get a notification to recharge.   Safely get an MRI scan.*  Easily turn on MRI Mode so you can safely get a full-body MRI scan.     *Within conditional parameters. Refer to https://www.nevro.com/English/us/patients/patient-manuals/default.aspx  for detailed information on MRI safety and conditions.  ________________________________________  The HFX App will work on select Apple devices: iPhone 8 and above running iOS 15 or later. To view the list of compatible devices, go to https://www.NevroHFX.com/resources/hfx-app/ The HFX App is approved for use with the Nevro HFX iQ Spinal Cord Stimulator within the U.S., English Only.  The HFX App controls an implanted medical device only available if prescribed by a physician. You should consult your physician before using the Nevro HFX iQ Spinal Cord Stimulator (including the HFX App) or making medical decisions.  The HFX App can change your HFX iQ therapy settings; use only as directed by your Nevro Care Team or physician.  Nevro Corp. 1800 Bridge Parkway Redwood City, CA 94065 U.S.A.  Provider and Patient MRI Questions p: +1-888-895-8105  HFX, the HFX logo, HFX iQ, the HFX iQ logo, NEVRO, and the NEVRO logo are trademarks or registered trademarks of Nevro Corp. iPhone is a registered trademark of Apple, Inc.  Bluetooth is a registered trademark of Bluetooth SIG, Inc. and Nevro’s use is under license.

Screenshots

NXTSTIM4 screens
HFX4 screens

Verdict

The call

The clearest difference is review sentiment: NXTSTIM at 67% against HFX's 12%. NXTSTIM also leads on rating (3.6 vs 3.0) and update cadence (every 3 weeks vs every 3 months). HFX's advantage is ratings volume (164 vs 14). On price, 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

NXTSTIM holds the better App Store score, 3.6 against 3.0. That said, the two scores are not equally well evidenced: HFX has 164 ratings behind it against 14, so its average is the more settled of the two. Written reviews point the same way: 67% of NXTSTIM's written reviews are positive against 12% of HFX's.

UpkeepUpdate frequency

NXTSTIM ships an update every 3 weeks, HFX every 3 months. The most recent releases landed on October 3, 2026 and October 22, 2026 respectively.

Scorecard4 real differences · 6 level
NXTSTIM versus HFX: the parameters behind the verdict, then further details
ParameterNXTSTIMHFX
PriceFreeFree
Rating3.6 (14 ratings) — better3.0 (164 ratings)
Positive reviews66.7% of reviews — better12.1% of reviews
Number of ratings14164 — better
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size33 MB59 MB
Age rating12+17+
DeveloperNXTSTIM LLCNevro Corp.

Customer experience

NXTSTIM

All ratings14 ratings
Positive64.3%
Neutral7.1%
Negative28.6%
Written reviews9 reviews
Positive66.7%
Neutral11.1%
Negative22.2%

HFX

All ratings71 ratings
Positive56.3%
Neutral8.5%
Negative35.2%
Written reviews58 reviews
Positive12.1%
Neutral29.3%
Negative58.6%

Bugs and requests

NXTSTIM

Not enough reviews yet to summarise bugs or requests.

HFX

Reported bugs

22 issues
  • Connection issues
  • Stopped connecting
  • Bluetooth connection problems
  • White screen
  • App not loading
Show 17 more
  • App freezing
  • Assessment alert not working
  • App crashes
  • Takes multiple attempts to connect
  • Dropping off network
  • App not working
  • Syncing issues
  • Upload error
  • Low battery notifications not working
  • Battery drain on iOS
  • Difficulties staying connected
  • Won't connect
  • Doesn't sync with Bluetooth
  • Can't find device
  • Not phone compatible
  • Charger shuts down quickly
  • Stimulation changes without user input

Requested features

14 requests
  • Dark mode option
  • Add an option to write notes
  • Improve battery percentage display
  • Improve pain rating system
  • Add percentage to battery meter
Show 9 more
  • Fix push notifications for low battery
  • Option to write notes and communicate in own words
  • Improve IQ mode functionality
  • More attention to reliability
  • Better system for daily questions
  • Improve assessment questions
  • Add ability to communicate with team advocates
  • Improve connection stability
  • Notification for app updates

In-app purchases

None

NXTSTIM

No in-app purchases

None

HFX

No in-app purchases

Questions

Is NXTSTIM free?
NXTSTIM is free to download, with no in-app purchases.
Is HFX free?
HFX is free to download, with no in-app purchases.
Which has better reviews, NXTSTIM or HFX?
NXTSTIM is rated higher. NXTSTIM averages 3.6 out of 5 from 14 ratings, while HFX averages 3.0 from 164 ratings.
Do NXTSTIM or HFX have ads?
Neither NXTSTIM nor HFX shows ads.
Which is updated more often, NXTSTIM or HFX?
NXTSTIM ships an update every 3 weeks, and HFX every 3 months. Most recently, NXTSTIM was updated on October 3, 2026 and HFX on October 22, 2026.

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