Comparison

Nerva vs retimer

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

Head to head
About

Nerva

This app offers a personalized gut-brain therapy program to manage symptoms of IBS, FD, GERD, and other gut-brain disorders. It aims to retrain the nervous system and improve communication between the gut and brain through daily sessions and practical tools.

Highlights
  • Personalized gut-brain therapy program
  • Daily 15-minute retraining sessions
  • Flare-up management tools
  • Long-term symptom maintenance plan
  • AI-driven personalization
  • Evidence-based clinical research
Features
Read full description

Fix the miscommunication between your gut and brain. Designed for people living with IBS, functional dyspepsia (FD), GERD, bloating symptoms, and other gut–brain disorders - as well as those seeking additional support alongside IBD care - Nerva is a personalized gut–brain program that supports symptom management through daily sessions, practical tools, and structured guidance. Target the root cause Many people spend years cutting out foods in an effort to calm their gut - a difficult path that can miss what’s really driving symptoms. In disorders of gut–brain interaction (DGBIs), the root cause is gut–brain hypersensitivity. After a trigger like illness, antibiotics, or prolonged stress, the nerves in the gut can become over-reactive. Even once the gut tissue heals, the nervous system may keep the alarm turned up. Normal digestion, gas, or movement are then misread as danger - leading to pain, bloating, reflux, urgency, constipation, or diarrhea. Diets and medications can reduce symptoms temporarily, but they don’t retrain this signaling system. That’s why symptoms often return or shift over time. Lasting relief means calming the nervous system and restoring healthy gut–brain communication - where the symptoms actually start. How Nerva helps Nerva is a structured gut–brain program that helps you practice brain-gut techniques shown to support a calmer response to gut sensations. Over the program you'll learn to: - Respond differently to uncomfortable gut signals - Practice calming the gut–brain stress response - Build daily habits that support digestive comfort Tailored to you No two guts are the same. Nerva adapts your program to your symptoms, triggers, and progress - using AI to adjust the coaching and guidance as you go. The sessions, the tools you receive, and the coaching you follow are all shaped around your experience. Evidence-based Unlike most apps, Nerva is built on clinical research. In a randomized controlled trial at Monash University, Nerva helped 81% of people significantly manage their gastrointestinal symptoms. Since then, more than 300,000 people have used Nerva, and over 11,000 healthcare providers recommend it. Features of Nerva - Daily 15-minute sessions designed to retrain gut-brain miscommunication - Flare-up tools for pain, bloating, constipation, reflux and diarrhea - Long-term maintenance plan to keep symptoms under control after the program - AI personalization to tailor the program to your selected triggers and progress Who is the team behind Nerva? Nerva was built by Dr. Simone Peters, GI psychophysiologist, together with clinicians, dietitians, and researchers. Many of us live with gut conditions ourselves. Member stories “Nerva has really worked for me. I’ve been using the app for several months now, and I’ve noticed that I’m experiencing less negative instances with my stomach. I would highly recommend to anyone - absolutely worth the subscription” Disclaimer: Nerva is a self-guided program that may help people self-manage and live well with a diagnosed disorder of the gut-brain interaction. It is not a substitute for professional medical care, diagnosis, or treatment, and has not been evaluated by the FDA, TGA, MHRA, or equivalent bodies. Do not change prescribed medication or treatment without professional advice. Some content is personalized or generated by AI for educational and wellness purposes only. It is not therapy or mental health care, is not from a licensed professional, and is not monitored in real time. If you are in distress or thinking of harming yourself or others, call your local emergency number right away. Subscription and trial 7-day free trial After the trial, your account is charged according to the plan you choose Subscriptions renew until cancelled Cancel anytime in iOS Settings, Apple ID, Subscriptions Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.mindsethealth.com/privacy

About

retimer

This app helps manage and monitor your circadian rhythm to improve sleep and energy levels. It works with a light therapy wearable to address issues like jet lag, irregular work hours, and general sleep difficulties.

Highlights
  • Circadian rhythm management
  • Sleep monitoring
  • Energy level improvement
  • Jet lag adjustment
  • Light therapy integration
Features
Read full description

Sleep Better, Feel Energized, Be Your Best Self: Welcome to the cutting-edge approach to wellness with retimer app. retimer app together with our Re-Timer light therapy wearable provides a simple method to manage, monitor & align your circadian rhythm with your lifestyle challenges – jet lag, odd working hours, inability to sleep or awaken on time, & poor sleep in general.

Screenshots

Nerva4 screens

Verdict

The call

The clearest difference is review sentiment: Nerva at 72% against retimer's 0%. Nerva also leads on rating (4.7 vs 2.0) and ratings volume (15K vs 1). retimer's advantage is in-app purchases (none vs 4) and iOS requirement (13.0 vs 15.1). On price, update cadence, ads and device support 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. Nerva sells 4 in-app purchases, starting at $99.00 per month. retimer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Nerva holds the better App Store score, 4.7 against 2.0. That said, the two scores are not equally well evidenced: Nerva has 15K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 72% of Nerva's written reviews are positive against 0% of retimer's.

UpkeepUpdate frequency

Nerva ships an update every 2 weeks, retimer every 3 weeks. The most recent releases landed on October 13, 2026 and October 4, 2026 respectively.

Scorecard7 real differences · 4 level
Nerva versus retimer: the parameters behind the verdict, then further details
ParameterNervaretimer
PriceFreeFree
Rating4.7 (15K ratings) — better2.0 (1 ratings)
Positive reviews72.4% of reviews — better0.0% of reviews
Number of ratings15K — better1
Update frequencyEvery 2 weeks — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#186 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.113.0 — better
Further details — not scored
Size138 MB108 MB
Age rating12+4+
DeveloperMindset Health Pty LtdRe-Time Pty Ltd

Customer experience

Nerva

All ratings14,932 ratings
Positive93.1%
Neutral3.2%
Negative3.7%
Written reviews880 reviews
Positive72.4%
Neutral5.9%
Negative21.7%

retimer

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Nerva

Reported bugs

3 issues
  • App getting stuck on certain days
  • Difficulty accessing previous sessions
  • Inconsistent user experience across devices

Requested features

4 requests
  • More variety in guided visualizations
  • Ability to skip or replace certain sessions
  • Maintenance plan with reduced pricing
  • Offline access to recordings

retimer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

Nerva

Subscriptions4
  • Nerva IBS program (Monthly)7 Days trial$99.001 Month
  • Nerva IBS program (3 Month)7 Days trial$149.003 Months
  • 30% Off Nerva IBS (3 Month)7 Days trial$149.003 Months
Show 1 more
  • Nerva Full Access7 Days trial$199.001 Year
None

retimer

No in-app purchases

Questions

Is Nerva free?
Nerva is free to download, with in-app purchases available.
Is retimer free?
retimer is free to download, with no in-app purchases.
Which has better reviews, Nerva or retimer?
Nerva is rated higher. Nerva averages 4.7 out of 5 from 15K ratings, while retimer averages 2.0 from 1 ratings.
Do Nerva or retimer have ads?
Neither Nerva nor retimer shows ads.
Which is updated more often, Nerva or retimer?
Nerva ships an update every 2 weeks, and retimer every 3 weeks. Most recently, Nerva was updated on October 13, 2026 and retimer on October 4, 2026.

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