Cornerstone Strength

K&G Apps

In-app purchases

About this app

STOP GUESSING. TRAIN WITH CONFIDENCE.

Cornerstone Strength is the workout tracker and gym log that helps you know what to do next—and understand why.

Every set becomes useful context: what your strength program called for, how you performed, how hard it felt, and how your training is trending. Cornerstone turns that context into clear guidance while keeping you in control.

KNOW WHAT TO DO NEXT

Get your next weight, sets, and reps suggested right on the workout screen. Smart Suggestions use your recent performance, logged effort (RPE/RIR), time between sessions, and program targets.

Every suggestion includes a plain-language reason. Apply it with one tap, adjust it, or keep your plan. It is a starting point—not a rule.

EVERY WORKOUT HAS A PURPOSE

Choose from workout programs written by real strength coaches using proven periodization for strength training, hypertrophy, athleticism, or a mix. Enter your numbers and train, customize a program, or build your own workout plan from scratch.

Percentage-based programs calculate working weights from your training maxes automatically.

SEE THE TREND BEFORE THE NEXT PR

Understand whether the work is working:

• Estimated 1RM (e1RM) trends • Training volume by muscle group • Weekly volume and muscle-balance insights • Personal-record history and automatic PR detection • Workout consistency and streaks • Month, 3-month, year, and all-time views

LOG WITHOUT LOSING YOUR FLOW

• Weight, reps, RPE, RIR, and AMRAP support • Previous performance beside today’s set • Structured program sessions or quick freestyle workouts • Background rest timer with audio and vibration alerts • Exercise swaps, notes, and workout duration • Band tracking for accommodating resistance • Health Connect workout sync

500+ EXERCISES

Find exercises for a commercial gym, home gym, or anywhere in between. Browse by muscle group or equipment, including barbells, dumbbells, kettlebells, machines, cables, bodyweight, trap bars, specialty bars, and more.

SHARE THE WORK

Turn a completed workout into a clean card with PRs, top lifts, and muscle-group balance. Share it to Instagram Stories, save it, or send it to a training partner.

START WITH 30 DAYS OF PRO—FREE

Every new account gets 30 days of Cornerstone Pro with every program, Smart Suggestions, and full analytics unlocked. No credit card required. When the 30 days end, keep using the free workout log forever or subscribe to keep Pro.

BUILT FOR LIFTERS

• Dark and light themes • Fast, focused interface • No ads

Cornerstone does more than remember what you lifted. It helps the next training decision feel clear.

Ratings and reviews

Fantastic strength training app! I love the variety of programs to choose from. I train from my home gym, so having programs written for a home gym is a huge win. Logging workouts is super easy, and being able to see my progress on every exercise and body part is awesome. Definitely advanced features that allow you to keep making progress, and make the cost worth it. Overall a great app!

I've always struggled with strength training but this app is helping me to do more and to do it better.

This is an amazing app. Love it!

What’s new

Various bug fixes