Comparison

Quell Flex vs EbbChart

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Quell Flex

Features
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After pairing their Quell Flex devices to the Quell Flex app, users can: - Start and stop therapy - Control stimulation intensity - Check therapy status (e.g., time left in session) - Check device battery level - Review informational videos and other materials related to the devices * You should consult your physician before making changes to your chronic pain treatment plan.

About

EbbChart

Features
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Track your hearing between appointments. An audiogram is a snapshot. If your hearing fluctuates, important changes can happen in the weeks between appointments, when they may otherwise go unrecorded. EbbChart lets you build that record yourself. Run audiogram-style hearing tests on your iPhone, log the symptoms that come with them, and build a longitudinal picture you can take to your ENT or audiologist. CAPTURE ON IPHONE, EXPLORE ON IPAD Install EbbChart on your iPad too. It's free, and your record syncs across both when you sign in with the same account. On the larger screen you can navigate your full hearing history, compare individual audiograms, examine changes within a day and explore treatment timelines. Bring your iPad to your appointment and go through your record with your specialist. FEATURES โ€ข Run audiogram-style hearing tests in minutes โ€ข Track tinnitus, fullness, vertigo, fatigue and other symptoms โ€ข Log treatments, medications and potential triggers โ€ข See how your hearing test results change over time, across tested frequencies โ€ข Compare your hearing test results before and after a treatment โ€ข Generate reports to share with your ENT or audiologist โ€ข Import hearing tests from Apple Health and audiograms from clinic tests โ€ข Connect your record to Claude to ask questions about your trends (you choose what's shared) DESIGNED FOR HEARING THAT FLUCTUATES EbbChart is designed for people whose hearing changes over time, including those living with conditions that cause fluctuating or variable hearing loss. SUPPORTED HEADPHONES โ€ข Apple AirPods Pro (recommended) โ€ข Sony WH-1000XM3 โ€ข Sony WH-1000XM5 Additional headphone support is being added over time. You can also import hearing tests from Apple Health, including tests performed using supported third-party hearing test apps. YOUR DATA, YOUR CONTROL No advertising. No selling of personal data. Export, share, or delete your record at any time. EbbChart is free to use, with optional tips to support development. Tips don't unlock any features. IMPORTANT INFORMATION EbbChart is a personal wellness tool for tracking and recording your own hearing test results and symptoms over time. It does not provide a medical diagnosis or treatment and is not a substitute for professional medical care. Always consult a qualified healthcare professional before making medical decisions. Sudden or rapidly worsening hearing loss can be a medical emergency. If your hearing has changed suddenly, contact a doctor or emergency service straight away. Don't wait to track it in the app.

Screenshots

Quell Flex4 screens
EbbChart4 screens

Verdict

The call

The clearest difference is in-app purchases: Quell Flex at none against EbbChart's 3. EbbChart's advantage is update cadence (every 2 months vs every 35 months) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. EbbChart sells 3 one-off in-app purchases. Quell Flex asks for nothing beyond the download.

UpkeepUpdate frequency

Quell Flex ships an update every 35 months, EbbChart every 2 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

Scorecard3 real differences ยท 3 level
Quell Flex versus EbbChart: the parameters behind the verdict, then further details
ParameterQuell FlexEbbChart
PriceFreeFree
Update frequencyEvery 35 monthsEvery 2 months โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhoneiPhone, iPad, iPod โ€” better
Requires iOS16.615.1 โ€” better
Further details โ€” not scored
Size23 MB40 MB
Age rating12+17+
DeveloperNeuroMetrix, Inc.David McAvinue

In-app purchases

None

Quell Flex

No in-app purchases

3 purchases

EbbChart

One-time3
  • Support EbbChart$2.99
  • Support EbbChart$4.99
  • Support EbbChart$12.99

Questions

Is Quell Flex free?
Quell Flex is free to download, with no in-app purchases.
Is EbbChart free?
EbbChart is free to download, with in-app purchases available.
Do Quell Flex or EbbChart have ads?
Neither Quell Flex nor EbbChart shows ads.
Which is updated more often, Quell Flex or EbbChart?
Quell Flex ships an update every 35 months, and EbbChart every 2 months. Most recently, Quell Flex was updated on November 3, 2026 and EbbChart on November 5, 2026.

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