Treadmill Smart Speed vs PBOX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Treadmill Smart Speed
This app transforms your iPhone into a Bluetooth speed and incline sensor for treadmills. It broadcasts your running speed and incline, allowing fitness apps like Zwift to track your performance without additional hardware. An Apple Watch app can also stream heart rate and cadence data.
- Broadcasts speed and incline as Bluetooth sensor
- Works with Zwift and other fitness apps
- Apple Watch integration for heart rate and cadence
- Customizable speed presets
- Metric/Imperial unit selection
- Background broadcasting
- Standalone 'Just Run' mode with 3D park simulation
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Your treadmill, on Zwift. Treadmill Smart Speed turns your iPhone into a Bluetooth running speed and incline sensor. Set the speed you are running on screen and your iPhone broadcasts it, exactly as a footpod would — so Zwift, and any other app that reads a running sensor, sees your treadmill. No footpod, no treadmill upgrade, no extra hardware. GETTING CONNECTED 1. Start pairing in Zwift. Open the pairing screen and choose the run speed sensor slot. 2. Look for this iPhone by its own name. The app cannot change how it appears — to change what Zwift shows, rename the phone in Settings › General › About › Name. 3. Wait for the pill to turn green. It reads Connected once a fitness app is receiving speed. Until then it reads Discoverable. BUILT TO BE READ MID-RUN The screen is made to be read at arm's length, in a dim room, while you are running. The speed being broadcast owns the display, and every control sits in the half a thumb reaches. • A large speed readout with your current pace beneath it • Plus and minus keys that step in 0.1 increments • Six presets you set to your own paces, one tap each • Incline, sent alongside speed • Metric or imperial, chosen separately for speed and for pace • Keeps broadcasting in the background, so glancing at another app does not drop the connection APPLE WATCH The Apple Watch app estimates your speed and cadence from your wrist and reads your heart rate, then streams them to your iPhone. Your iPhone broadcasts the speed, and your heart rate as a heart-rate sensor that Zwift can pair too. Your run is saved to Health as a workout. JUST RUN No app to send the speed to? Choose Just Run at the bottom of the speed source list and your iPhone records the run on its own. Set the speed to match the treadmill's console and run through a 3D park, as a man or a woman. Every kilometre or mile has a gate: run through it for your split, a tap and a burst of confetti. Each run is kept on your iPhone with its time, distance and pace. Match the distance to the treadmill's display afterwards, and export the run as a TCX file to share or save. The last 50 runs are kept, and you can delete any of them. IF YOU BOUGHT THE ORIGINAL APP It stays yours. Everything in this version is free for you, for ever — no subscription, nothing to restore. It is recognised automatically from your Apple Account, on any of your devices. FREE TO TRY Every feature is free for a 10-minute run, with an hour between free runs. When a free run ends, the speed sent drops to zero, and a Just Run run is saved up to that moment, until you unlock. Unlock forever is a one-time purchase with no subscription. Every run is then unlimited, and the unlock is shared with your family through Family Sharing. The price is shown before you buy. Privacy policy: https://appyappster.com/privacy Support: https://appyappster.com/support
PBOX
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The application is designed specifically for POWERBOX SC power meter from FSA and requires product serial on the purchased crankset to activate. In the app, users have access to simple indoor riding power data display and quick view to personal power bests in different time intervals. More features are coming soon…
Screenshots
Verdict
The clearest difference is in-app purchases: PBOX at none against Treadmill Smart Speed's 1. PBOX also leads on iOS requirement (11.0 vs 17.0). Treadmill Smart Speed's advantage is update cadence (weekly vs every 6 months). On price, 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
Both are free to download. Treadmill Smart Speed sells 1 one-off in-app purchase. PBOX asks for nothing beyond the download.
Treadmill Smart Speed ships an update weekly, PBOX every 6 months. The most recent releases landed on November 2, 2026 and October 25, 2026 respectively.
| Parameter | Treadmill Smart Speed | PBOX |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (24 ratings) — better | — |
| Positive reviews | 53.4% of reviews | — |
| Number of ratings | 24 — better | — |
| Update frequency | Weekly — better | Every 6 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, Apple Watch | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 65 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | AppyAppster Ltd | F.S.A. srl |
Bugs and requests
Treadmill Smart Speed
Reported bugs
24 issues- Problems reported with Zwift connectivity
- Doesn't show up on Bluetooth in Zwift
- Slow response time from armband mode
- Speed not detected in Zwift
- Intermittent information transmission
Show 19 moreShow fewer
- Hefty lag in updating speed on Zwift
- Accelerometer mode largely useless
- Disclaimer needs to be tapped away every time
- Armband doesn't work
- Does not transfer right speed
- Connected to Zwift but not working
- Doesn't connect to Zwift
- Not working out of a sudden
- Disconnects every time
- Bluetooth connectivity with Zwift issue
- iPhone Speed Sensor doesn't work
- Apple Watch app says 'not Connected to iPhone'
- No data transmitted to Zwift
- Doesn't work
- No support from link
- Can't get any feedback on iPhone
- App did not work
- Will not pair with Zwift
- New update won't allow update on iPad Pro
Requested features
7 requests- Improve response time for armband mode
- Allow app to work in background
- Develop for Zwift bike with Power (Watt)
- Make app available in more countries
- Provide instructions for Apple TV connection
Show 2 moreShow fewer
- Forward other BLE sensors (heart rate, cadence) for Apple TV
- UI polish
PBOX
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Treadmill Smart Speed
- Unlock forever$9.99
PBOX
No in-app purchases









