Evolutioner vs Castle Flexx
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Evolutioner
This app utilizes sound frequencies for energy enhancement and sleep improvement. It offers dedicated 12-minute audio sessions for morning energy boosts and evening relaxation to aid sleep. No sign-up is required to experience its benefits.
- Energy-boosting sound sessions
- Sleep-inducing sound sessions
- 12-minute audio sessions
- No sign-up required for trial
- Privacy policy available
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Studies show that specific frequencies can counter the effects of aging. Evolutioner is a sound therapy program that uses soundwaves to expose the body to these frequencies. Please note that the Evolutioner program is not a replacement for medical or psychological treatment and is not intended to diagnose, treat, cure, or prevent any disease. We do not express, imply, or intend any medical claims. Although all statements on the website are accompanied by research or user feedback, no statements have been approved by the U.S. Food and Drug Administration. Privacy Policy: https://evolutioner.com/privacy-policy Terms of Use: https://evolutioner.com/terms-of-use
Castle Flexx
This app offers a simple interface to shop for award-winning devices designed to alleviate chronic pain. It also provides a training section, FlexxLab, to help users manage conditions like plantar fasciitis, back pain, and hip pain.
- Shop for pain relief devices
- FlexxLab training section
- Addresses chronic pain issues
- Supports iPhone and iPod
- Designed for mobility
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The Future of Mobility is here. We design award winning devices that address the root cause of common chronic pain issues. We've kept our app very simple: Shop or Train (FlexxLab) Chronic Pain issues we address: Plantar Fasciitis Back Pain (L4 L5) Shoulder Impingement Hip Pain Tight Calves Tight Hamstrings Achilles Wrist and forearm Tech Neck
Screenshots
Verdict
The clearest difference is review sentiment: Evolutioner at 68% against Castle Flexx's 19%. Evolutioner also leads on rating (4.8 vs 3.0) and ads (none vs shown). Castle Flexx's advantage is in-app purchases (none vs 5). On price and update cadence 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
Both are free to download. Evolutioner sells 5 in-app purchases, starting at $14.99 per month. Castle Flexx asks for nothing beyond the download.
Evolutioner holds the better App Store score, 4.8 against 3.0. That said, the two scores are not equally well evidenced: Evolutioner has 1.7K ratings behind it against 32, so its average is the more settled of the two. Written reviews point the same way: 68% of Evolutioner's written reviews are positive against 19% of Castle Flexx's.
Evolutioner ships an update fortnightly, Castle Flexx monthly. The most recent releases landed on September 24, 2026 and September 21, 2026 respectively.
| Parameter | Evolutioner | Castle Flexx |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (1.7K ratings) — better | 3.0 (32 ratings) |
| Positive reviews | 68.2% of reviews — better | 18.8% of reviews |
| Number of ratings | 1.7K — better | 32 |
| Update frequency | Fortnightly — better | Monthly |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 14.0.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 54 MB | 80 MB |
| Age rating | 4+ | 4+ |
| Developer | La Grange International Inc. | Castle Flexx |
Customer experience
Evolutioner
Castle Flexx
Bugs and requests
Evolutioner
Reported bugs
3 issues- Frequent app crashes
- Login issues and inability to access account
- Playback problems with music stopping unexpectedly
Requested features
5 requests- More variety in music tracks
- Option to download tracks for offline use
- Ability to customize frequency settings
- Integration with other health/wellness apps
- Better user interface and navigation
Castle Flexx
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Evolutioner
- Monthly Access7 Days trial$14.991 Month
- Monthly7 Days trial$29.991 Month
- Yearly Access7 Days trial$89.991 Year
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- Yearly7 Days trial$179.991 Year
- Lifetime Access$199.99
Castle Flexx
No in-app purchases
