Onyx

Onyx

AI-powered mobile trainer with form feedback

Overview

Onyx is a mobile AI-powered personal trainer for at-home workouts. It uses the smartphone camera to track movements, automatically counts reps, and provides real-time feedback on form to prevent injuries and improve effectiveness. It offers personalized workout plans aligned with goals like strength, muscle building, or weight loss, and it tracks progress over time. Its differentiator is real-time form correction and rep counting through computer vision, combined with integrated coaching and progress tracking in one app to support safer, more effective workouts.

YC Company
Significant Headcount Growth

About Onyx

Simplify's Rating
Why Onyx is rated
D+
Rated D+ on Competitive Edge
Rated C on Growth Potential
Rated D+ on Differentiation

Industries

Data & Analytics

Consumer Software

AI & Machine Learning

Healthcare

Company Size

11-50

Company Stage

Seed

Total Funding

$10.1M

Headquarters

San Francisco, California

Founded

2023

Simplify Jobs

Simplify's Take

What believers are saying

  • Private leaderboard groups with friends boost user engagement significantly.
  • Lifetime subscriptions grant unlimited access to all workouts and tracking.
  • Real-time competition via game-like matchmaking drives retention higher.

What critics are saying

  • Apple Fitness+ AI form correction locks users into ecosystem within 6-12 months.
  • Google Fit pre-installs Gemini rep counting on 2B+ Android devices in 9-15 months.
  • OpenAI GPT-5 API commoditizes camera form correction for competitors in 6-12 months.

What makes Onyx unique

  • Onyx uses smartphone camera for 3D motion capture to count reps accurately.
  • Provides real-time form correction to prevent injuries during home workouts.
  • Offers personalized programs for strength, muscle building, and weight loss.

Help us improve and share your feedback! Did you find this helpful?

Funding

Total Funding

$10.1M

Above

Industry Average

Funded Over

2 Rounds

Seed funding is usually the first official round after pre-seed, when a startup has a prototype or concept. It’s typically used to develop the product, test the market, and start building the team. Investors here are often angel investors or early-stage venture capitalists.
Seed Funding Comparison
Above Average

Industry standards

$3.3M
$2M
Netflix
$2.3M
Instacart
$3M
Robinhood
$10M
Onyx

Benefits

Remote Work Options

Flexible Work Hours

Unlimited Paid Time Off

Paid Vacation

Health Insurance

401(k) Retirement Plan

401(k) Company Match

Wellness Program

Mental Health Support

Conference Attendance Budget

Professional Development Budget

Stock Options

Company Equity

Parental Leave

Family Planning Benefits

Fertility Treatment Support

Adoption Assistance

Phone/Internet Stipend

Home Office Stipend

Relocation Assistance

Tuition Reimbursement

Professional Certification Support

Growth & Insights and Company News

Headcount

6 month growth

0%

1 year growth

-6%

2 year growth

29%
AiThority
Mar 13th, 2025
Onyx Raises $10 Million To Help Teams Find Knowledge Faster with Open Source AI Agents

Onyx, the first AI deep research agent designed for the workplace, announced today a $10M seed round of funding.

The Business Journals
Apr 3rd, 2024
Here's what you need to know about Y Combinator's 2024 winter batch demo day

Y Combinator seeded more than 250 companies in its current winter batch, which leans heavily into AI. One particular AI subcategory has nearly tripled over the past year.

Recently Posted Jobs

Sign up to get curated job recommendations

Onyx is Hiring for 5 Jobs on Simplify!

Find jobs on Simplify and start your career today

Don't see your dream role? Check out thousands of other roles on Simplify. Browse all jobs →