iBac PRO vs CastleFit
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iBac PRO
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Extremely small - Extremely accurate Professional alcometer in pocket size. iBAC is an accurate alcometer designed to fit on your key chain. It connects to your smartphone via the iBAC app. iBAC has been tested by MHF International road safety test lab to be as accurate as the professional devices – but the size is only one tenth to one fifth of the competitors. iBAC Pro app provides additional features like: - Communication to the backend. - User login feature with multiple users support. - Random and scheduled testing.
CastleFit
This app offers guided stretching and mobility sessions to relieve pain, improve flexibility, and aid recovery. It provides routines for various needs, from injury recovery to pre-training warm-ups, all accessible at home.
- Guided stretch and mobility sessions
- Targeted relief for specific body parts
- HD instructional videos
- Sessions organized by age, ability, and goals
- Active and passive stretching routines
- Device lineup browsing and purchasing
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Relieve pain. Improve flexibility. Recover faster. Castle Fit brings the full CastleFlexx experience to your phone — guided stretch and mobility sessions built around the device that helps treat the root causes of lower back pain, plantar fasciitis, tight calves, hamstring tightness, and limited mobility. Whether you are recovering from an injury, loosening up before training, or building a daily movement habit, Castle Fit gives you a clear, follow-along routine you can do at home. WHAT YOU GET ◆ Dozens of instructional HD videos and relaxing flows ◆ Sessions organized by your age, ability, and goals ◆ Guided programs from leading trainers and therapists ◆ Active and passive stretching routines for full-body mobility ◆ Targeted relief for calves, hamstrings, hips, lower back, and feet SHOP THE FULL RANGE ▸ Browse the complete CastleFlexx device lineup and accessories ▸ Save your favorites to a wishlist ▸ Fast, secure checkout ▸ Track your orders from purchase to delivery ▸ Get updates on new arrivals and restocks TRUSTED BY EXPERTS AND ATHLETES CastleFlexx is recommended by clinicians and chiropractors and used by professional athletes as part of their recovery. The device pairs stretching with core strengthening for a balanced, controlled experience. BUILT FOR YOUR ROUTINE Follow along at your own pace, choose sessions that match how your body feels today, and come back to the flows that work best for you. Everything is designed to keep you moving, mobile, and pain-free. Download Castle Fit and start moving better today.
Screenshots
Verdict
The clearest difference is update cadence: CastleFit at every 2 weeks against iBac PRO's every 6 weeks. iBac PRO's advantage is iOS requirement (12.0 vs 15.1). On price, ads, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
iBac PRO ships an update every 6 weeks, CastleFit every 2 weeks. The most recent releases landed on October 26, 2026 and October 22, 2026 respectively.
| Parameter | iBac PRO | CastleFit |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 6 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 16 MB | 45 MB |
| Age rating | 17+ | 4+ |
| Developer | Alcosystems Sweden AB | Castle Flexx |
In-app purchases
iBac PRO
No in-app purchases
CastleFit
No in-app purchases









