Ankle Flex vs StayUpRight!
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ankle Flex
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A timer app associated with the Ankle Flex physical therapy device. Includes the default timers for the Ankle Flex protocol, the ability to create new custom timers, and automatic activity logging.
StayUpRight!
Measure your balance using your phone's sensors. Track scores over time and sync with Apple Health data like sleep and steps. This app helps you monitor postural sway to understand your balance capabilities.
- Balance measurement via phone sensors
- Postural sway quantification
- Three simple balance poses
- Score tracking over time
- Apple Health data sync
- Audio and written instructions
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StayUpRight! is the non-prescription balance measurement app from UpRight Science. Balance decline is the single predictor of fall, cognitive decline, and loss of independence. Take control of your life. The StayUpRight! mobile app equips you with technology to measure your balance anytime, anywhere. StayUpRight! uses your phone's built-in motion sensors to quantify postural sway. No wearables, no setup—just three quick poses. Each pose challenges a different system that keeps you upright. Together they paint a complete picture of your balance. Hit start and hold the phone against your chest vertically. Simple written or audio instructions guide you through the poses. Pose 1: Stand upright with feet together. Pose 2: Stand on left leg with right leg up off the ground. Pose 3: Stand on right leg with left leg up off the ground. That’s it, just three simple poses that take 10 seconds each. You’ll immediately see your score after that. Create a free account and you can: > Track your scores over time > Sync your scores with other health data from Apple Health > Sleep > Steps > Heart Rate The StayUpRight! mobile app equips you with technology derived from the FDA-cleared, prescription-required, balance measurement app from UpRight Science. StayUpRight! is provided for wellness purposes and is not a medical device.
Screenshots
Verdict
The clearest difference is update cadence: StayUpRight! at every 2 weeks against Ankle Flex's every 5 months. Ankle Flex's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 17.0). On price, ads and in-app purchases 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.
Ankle Flex ships an update every 5 months, StayUpRight! every 2 weeks. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.
| Parameter | Ankle Flex | StayUpRight! |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (4 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 4 — better |
| Update frequency | Every 5 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 10 MB | 46 MB |
| Age rating | 4+ | 17+ |
| Developer | Perry Hooker | Upright Science, Inc |
In-app purchases
Ankle Flex
No in-app purchases
StayUpRight!
No in-app purchases









