Comparison

Katalyst vs Tether

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

Head to head
About

Katalyst

This app enhances a revolutionary workout system using Electro Muscle Stimulation (EMS) to engage all muscles simultaneously. It offers a full-body workout in just 20 minutes, with zero joint load. Access diverse workout programs and control intensity for personalized training.

Highlights
  • Electro Muscle Stimulation (EMS) training
  • Full-body engagement
  • 20-minute workouts
  • Zero joint load
  • Diverse workout library (strength, power, cardio, recovery)
  • Adjustable impulse intensity
  • Offline workout access
Features
Read full description

The Katalyst App is the companion to the Katalyst Suit, a wearable training system powered by advanced fitness technology. Together, they deliver a full-body workout no app can deliver on its own. A Katalyst Suit is required to train. The Katalyst Suit is an FDA-cleared, patented system that uses Electro Muscle Stimulation (EMS) to engage your major muscle groups at once. Low-frequency impulses mimic the signals your brain sends to contract a muscle. Pair them with simple bodyweight movements and every rep works harder, engaging up to 90% of your muscle fibers, including the deep back stabilizers most workouts miss, with zero load on your joints. ALREADY HAVE A KATALYST SUIT The app is free. Log in or create your profile for unlimited access. NEW TO KATALYST Explore the app and preview the workouts. Get your system at katalyst.com. WORKOUT MODES FOR EVERY LEVEL Programs built by professional trainers, from your first session to elite. - Strength: complete full-body strength in less time - Power: explosive sessions that recruit fast-twitch fibers - Cardio: lower-frequency sessions designed to build endurance, with quick recovery for daily use - Recovery: active and passive modes with massaging impulses to finish like the pros
- Freestyle mode: Choose a mode, set your intensity, and train your own way. TRAIN LED OR TRAIN SOLO In guided classes, your trainer adjusts intensity in real time so you can focus on the movement. Prefer your own pace? Run independent programs on your terms. ALWAYS IN CONTROL Dial intensity up or down, or target a specific muscle group, at any moment. How hard you train is always your call. TRAIN ANYWHERE Stream any workout on demand, or download sessions ahead of time for when you'll be offline. BUILT FOR YOUR SETUP - Apple Watch: adjust overall intensity, pause, and resume workouts right from your wrist
- AirPlay: put your instructor on the big screen and use your iPhone or iPad as the remote Get more strength and more out of life with Katalyst Suit workouts. 
katalyst.com

About

Tether

This AI-powered coach helps you reconnect with your personal growth intentions. It listens to your shared experiences over time to reflect your progress and keep you aligned with your values and desired identity.

Highlights
  • AI-powered personal growth coach
  • Focus on identity and values
  • Personalized reflection of progress
  • Builds a long-term user profile
  • Daily conversational nudges
  • Starts with a single intention word
Features
Read full description

YOU KNOW WHO YOU WANT TO BE. YET YOU KEEP FALLING OFF TRACK. You decide to be more patient. More present. More adventurous. It holds for about a week. Then work piles up, someone needs something, and the person you meant to be gets lost. A month later you notice you fell off track. And you start over. Again. Tether keeps you pointed at who you want to be. What Tether does: • You pick up to three words for who you want to be. Grounded. Patient. Brave. Adventurous. Playful. Anything that you value. • You talk to Tether like a friend who's paying attention. A few minutes a day is plenty. • Each morning: what does being patient look like today? Each evening: how did it go? • When you're being the person you want to be, Tether tells you. When you drift, Tether helps you get back. Why it's different: • Becoming who you want to be takes daily practice. Tether is there every day to keep you on track. • Tether builds a picture of you over months, instead of forgetting you the second you close the app. • Tether won't give you generic, unearned advice. Tether spends the first few days listening, and speaks up only after getting to know you. How it starts: • Your name and one word for who you want to be. Two minutes. • A few days of Tether getting to know you. • After that, it's a conversation. Morning, evening, or whenever you need it. Free to start. $9.99/month or $79/year after. Questions, or something not working? Write to me at support@livetethered.com. I read every message. -Dennis, the human who built this. SUBSCRIPTION DETAILS Tether Membership is an auto-renewable subscription, offered monthly ($9.99) or annually ($79). Payment is charged to your Apple ID at confirmation of purchase. Your subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period. Manage or cancel your subscription in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://app.livetethered.com/privacy

Screenshots

Katalyst4 screens
Tether4 screens

Verdict

The call

The clearest difference is in-app purchases: Katalyst at none against Tether's 2. Katalyst also leads on ratings volume (59 vs 3). Tether's advantage is rating (5.0 vs 4.6) and review sentiment (100% vs 81%). On price, update cadence, ads and monetization model 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Tether sells 2 in-app purchases, starting at $9.99 per month. Katalyst asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Tether holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Katalyst has 59 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 81% of Katalyst's written reviews are positive against 100% of Tether's.

UpkeepUpdate frequency

Katalyst ships an update every 3 weeks, Tether fortnightly. The most recent releases landed on October 25, 2026 and October 16, 2026 respectively.

Scorecard4 real differences · 6 level
Katalyst versus Tether: the parameters behind the verdict, then further details
ParameterKatalystTether
PriceFreeFree
Rating4.6 (59 ratings)5.0 (3 ratings) — better
Positive reviews80.6% of reviews100.0% of reviews — better
Number of ratings59 — better3
Update frequencyEvery 3 weeksFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPod
Requires iOS16.015.1 — better
Further details — not scored
Size155 MB44 MB
Age rating4+17+
DeveloperKatalyst Interactive Inc.Dennis Corsi

Customer experience

Katalyst

All ratings59 ratings
Positive88.1%
Neutral3.4%
Negative8.5%
Written reviews31 reviews
Positive80.6%
Neutral6.5%
Negative12.9%

Tether

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Katalyst

No in-app purchases

2 purchases

Tether

Subscriptions2
  • Tether — Monthly$9.991 Month
  • Tether — Annual$79.001 Year

Questions

Is Katalyst free?
Katalyst is free to download, with no in-app purchases.
Is Tether free?
Tether is free to download, with in-app purchases available.
Which has better reviews, Katalyst or Tether?
Tether is rated higher. Katalyst averages 4.6 out of 5 from 59 ratings, while Tether averages 5.0 from 3 ratings.
Do Katalyst or Tether have ads?
Neither Katalyst nor Tether shows ads.
Which is updated more often, Katalyst or Tether?
Katalyst ships an update every 3 weeks, and Tether fortnightly. Most recently, Katalyst was updated on October 25, 2026 and Tether on October 16, 2026.

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