SiBio CKM vs CycleJames
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SiBio CKM
This app allows users to monitor their real-time blood ketone data through Bluetooth transmission. It provides 14 days of historical data for tracking. Please note, it is for data collection only and not for diagnosis.
- Real-time blood ketone monitoring
- 14-day data history
- Bluetooth data transmission
- Data display and tracking
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SiBio CKM can help users monitor real-time blood ketone data. *14-day real-time blood ketone data monitoring *Bluetooth real-time transmission *Help users monitor their blood ketone data in real time Disclaimer: This software only provides data collection and display, and cannot be used as a basis for diagnosis. It is necessary to follow the doctor's advice all the time.
CycleJames
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CycleJames is a focused, single-purpose indoor cycling app for structured power-based training on FTMS-compatible smart trainers. No subscription, ever. Your data never leaves your iPhone. Connect your trainer over Bluetooth. Pick a workout. The app writes target watts to the trainer in real time so resistance follows the plan automatically, and no head unit required. Prefer to ride by feel? Switch to Free Ride and your trainer's own gears set the resistance, just like riding outdoors - while CycleJames still records every watt. WHAT YOU GET • 97 built-in workouts covering VO2max, threshold, sweet spot, endurance, recovery, sprint and tempo sessions — from 15-minute easy spins to 6-hour century-prep epics. • Live target power streaming over Bluetooth (FTMS protocol) — your trainer ets resistance for you. • Free Ride mode — drop ERG control and let your smart bike's gears drive the resistance; your power is still recorded. • Heart-rate display from any standard Bluetooth heart-rate monitor. • Adjust intensity mid-ride: scale the whole workout up or down in 5W steps, fine-tune the active interval, skip ahead, jump to any upcoming interval, or insert a custom interval on the fly. • Workout builder — design your own steady or ramp intervals and save them. • Export rides to Strava and Garmin Connect via the iOS share sheet (TCX). • Local ride history with average power, peak power, normalized power, intensity factor, and TSS for every session. • Calendar view of your training week and month. PRIVACY CycleJames keeps everything on your device. No accounts. No cloud. No analytics. No tracking. No subscription. Uninstall the app and your data goes with it. COMPATIBLE TRAINERS Any smart trainer that supports the standard FTMS Bluetooth profile, which includes most modern trainers from Wahoo, Tacx, Wattbike, Saris, Elite, JetBlack, and others. REQUIREMENTS iPhone running iOS 17 or later, plus an FTMS-compatible Bluetooth smart trainer. A Bluetooth heart-rate strap is optional. DISCLAIMER CycleJames is a fitness app, not a medical device. It does not diagnose, treat, cure or prevent any condition. Consult a qualified physician before starting any new training programme, and seek a doctor's advice before making any decisions related to your health. Stop exercising and seek medical attention if you experience pain, dizziness or other symptoms during a workout.
Screenshots
Verdict
The clearest difference is update cadence: CycleJames at fortnightly against SiBio CKM's every 2 months. SiBio CKM's advantage is iOS requirement (12.0 vs 17.0). 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.
SiBio CKM ships an update every 2 months, CycleJames fortnightly. The most recent releases landed on October 22, 2026 and October 31, 2026 respectively.
| Parameter | SiBio CKM | CycleJames |
|---|---|---|
| Price | Free | Free |
| Rating | 2.3 (6 ratings) — better | — |
| Positive reviews | 11.1% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 2 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 60 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | SiBio Technology Limited | James browne |
In-app purchases
SiBio CKM
No in-app purchases
CycleJames
No in-app purchases









