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Fitness · head to head

Mirror vs Stronger by Science

Mirror logo

Mirror

Fitness

The nearly invisible home gym

From
$39/month
Rated
-
Full reviewWebsite
Stronger by Science logo

Stronger by Science

Fitness

Evidence-based strength training

From
$10/one-time
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Mirror no built-in resistance equipment like Tonal's electromagnetic arms; Stronger by Science limited interactive features compared to competitors with video form coaching
  • They diverge on capability: Mirror covers Live classes, Stronger by Science covers Evidence-based programs.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Mirror and Stronger by Science actually diverge.

Attributes where Mirror and Stronger by Science differ
AttributeMirrorStronger by Science
Starting price$39/month$10/one-time
Pricing modelUnknownone-time
PlatformsStandalone hardware, iOS appWeb
Founded20162015

Identical on both: free tier (No), user rating (Not yet rated), category (Fitness).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Mirror

  • Live classes
  • On-demand library
  • Real-time form check
  • Personal training option
  • Heart rate display
  • Apple Watch
  • Bluetooth heart rate monitors
  • Ios support

Only in Stronger by Science

  • Evidence-based programs
  • Auto-regulated training
  • Progress tracking
  • RPE-based progression
  • Customizable templates
  • Google Sheets
  • Excel
  • Web support

What people use each for

The jobs each tool is most often brought in to do.

Mirror

  • Workout tracking
  • Nutrition management
  • Health monitoring
  • Fitness coaching
  • Wellness improvement

Stronger by Science

  • Workout tracking
  • Nutrition management
  • Health monitoring
  • Fitness coaching
  • Wellness improvement

Both are used for workout tracking, nutrition management, health monitoring, fitness coaching, wellness improvement, on those jobs the choice comes down to price and fit rather than capability.

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Mirror

  • No built-in resistance equipment like Tonal's electromagnetic arms
  • Strength training classes are circuit-based rather than traditional weightlifting programs
  • Lululemon discontinued hardware sales, affecting new customer acquisition

Stronger by Science

  • Limited interactive features compared to competitors with video form coaching

Pricing, plan by plan

Mirror

$39/month
  • Hardware$1495/one-time
    • Mirror screen
    • Installation option available
  • Subscription$39/month
    • 10,000+ classes
    • Live and on-demand
    • All class types
  • Personal Training$40/half-hour session
    • 1-on-1 coaching
    • Form correction

Stronger by Science

$10/one-time
  • Program Bundle$10/one-time
    • Multiple programs
    • Spreadsheet templates
    • Auto-regulation

Which should you pick?

Choose Mirror if

  • You need live classes.
  • You work on Standalone hardware, iOS app.
  • You also want on-demand library.
Mirror review

Choose Stronger by Science if

  • You need evidence-based programs.
  • You also want auto-regulated training.
Stronger by Science review

Questions people ask

Is Mirror or Stronger by Science better?
Neither clearly leads. Mirror starts at $39/month and Stronger by Science at $10/one-time, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Mirror or Stronger by Science?
Mirror starts at $39/month and Stronger by Science at $10/one-time.
Does Mirror or Stronger by Science run on more platforms?
Mirror runs on Standalone hardware, iOS app. Stronger by Science runs on Web.
What is Mirror best used for?
Mirror is most often used for workout tracking, nutrition management, health monitoring, fitness coaching.
What can Mirror do that Stronger by Science cannot?
Mirror covers Live classes, On-demand library, Real-time form check, Personal training option. Stronger by Science covers Evidence-based programs, Auto-regulated training, Progress tracking, RPE-based progression.

Answered from the vendors’ own pages

Mirror: What does the Mirror hardware cost?

The Mirror costs $1,495, with optional white-glove delivery and installation for an additional $250. Financing options available at $32/month for 48 months.

Source
Stronger by Science: Does Stronger by Science offer free training content?

Yes. Stronger by Science publishes extensive free articles on strength training, programming, nutrition, and evidence-based training techniques.

Source
Mirror: Is there a subscription fee beyond hardware?

Yes, Mirror requires a $39/month subscription for access to live and on-demand workout classes. Personal training sessions are available for an additional $40 per half-hour.

Source
Mirror: What types of workouts does Mirror offer?

Mirror offers over 10,000 live and on-demand workout classes across 60 different categories including strength, cardio, dance, boxing, and yoga.

Source
Mirror: Who owns Mirror now?

Lululemon acquired Mirror in June 2020 for $500 million and currently operates it as part of their fitness offerings, though hardware sales have been discontinued.

Source
Mirror: Does Mirror provide strength training with weights?

Mirror offers strength training classes but does not include built-in weights or resistance arms like Tonal. Users can filter for classes based on their available equipment.

Source
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