Christian fitness & training · Now on iPhone
Train your body,
strengthen your faith.
byrna brings faith and fitness together: a program that adapts to you, an AI coach you talk to, one score for your progress, and a daily Bible verse with a devotional. Grow stronger in body and in spirit.
Free to download. Premium starts with a 1-week free trial.
A coach that edits your actual plan.
Most apps bolt on a chatbot. byrna's coach holds the pen. Tell it what's going on in plain English and your real program changes: exercises swapped, days moved, the week dialed lighter or harder.
- Knows your goal, program, injuries, macros, and last five sessions before you type a word.
- Swaps exercises, reschedules days, or rebuilds the whole plan, then it's live on your calendar.
- Talks the way you want. Pick its tone.
A credit score for
your training.
One number from 300 to 850. Everyone starts at 650. It reads your last 28 days: how consistently you showed up, whether you're closing in on your goal, your sleep, and your fuel. It's goal-fair, so a beginner and a pro can both climb to Elite. What you do next moves the number.
Train your body.
Feed your spirit.
byrna is faith and fitness together. Every day opens with a verse of Scripture and a short, guided study, so the same discipline that builds your body draws you closer to God.
- A verse of the day from the World English Bible, shown exactly as it's written and never altered.
- Tap for a guided study (context, meaning, reflection, and a prayer) at the depth you choose.
- Keep your own notes, revisit your history, and share a study anywhere.
- Free for everyone. The devotional isn't behind a paywall. It's part of who byrna is.
"I can do all things through Christ, who strengthens me."
“For bodily exercise has some value, but godliness has value in all things, having the promise of the life which is now, and of that which is to come.”
A plan that adapts, and knows when to back off.
byrna builds your weekly program from your goals, experience, schedule, and any injuries. A real plan from day one, no templates, no spreadsheet-building. Then it keeps adjusting.
- Personalized the moment you finish onboarding.
- Auto-deloads when two rough sessions or a week of bad sleep say you're run down.
- Drag any workout to another day when life gets in the way.
Snap a meal. Get your macros.
Point your camera at your plate, or just describe it in a sentence. byrna's AI estimates the calories and macros. No barcodes, no database scrolling, and every meal feeds straight back into your Byrna Score.
Snap a meal
A photo from your camera or library. Analysis starts on its own.
Or log by text
“2 eggs, sourdough toast, and a flat white.” That's enough.
Finish a workout. Watch your body light up.
Every session ends on a muscle heatmap: the muscles you hit, shaded by how hard you hit them, plus any personal record you just set, ready to share. The satisfying payoff that keeps you coming back. And it's free.
- Front and back, ranked by effective sets. Accessory work never washes out.
- New PRs detected automatically and celebrated on the spot.
Start free. Go further with Premium.
Build your program, run every workout, log your lifts, watch your Byrna Score climb, all free. Premium unlocks the AI coach, food logging, and deep analytics.
- Personalized program & weekly calendar
- Full workout runner, rest timer & logging
- Muscle heatmap & personal records
- Your Byrna Score, sleep & weight logging
- AI Coach: plans that adapt to every set
- Food logging: snap or describe any meal
- Progress analytics: strength, volume & trends
- Everything in Free
Less than one protein shake a week. Less than half what most fitness apps charge for tracking alone — and you get the devotional, the score, and the coach.
Prices in USD, set through the App Store. Your local price is confirmed in-app at checkout. Every plan starts with a 1-week free trial. Subscriptions auto-renew; cancel anytime.
Serious about your safety.
Adults only, 18+
A verified age gate keeps byrna adults-only.
Not medical advice
Coaching is informational, never a substitute for a professional.
Your health data, read-only
Apple Health sleep is only ever read, and its uses are disclosed up front.
Crisis support built in
Real, human-verified helplines are one tap away, always.
Straight answers.
Is byrna related to Byrna Technologies, the self-defense company?
No. They are two completely separate and unrelated companies. Byrna Technologies Inc. is a publicly traded manufacturer of CO2-powered less-lethal self-defense launchers, based in Fort Wayne, Indiana. We have no connection to them, no affiliation with them, and we don't make or sell anything of the kind. byrna is a faith and fitness app for iPhone. Their site is byrna.com; ours is usebyrna.com.
Who built byrna?
Aiden Buck — one person. He wanted a single app where training and faith lived side by side and would keep him accountable to both, built it for himself, used it every day, and then realized other people should get to have it too. He reads every support email that comes in.
Is the free tier actually useful, or is it a demo?
It's the real thing. Free gets you a personalized program built from your goals and schedule, the full workout runner with rest timer and logging, the muscle heatmap and personal records, and your Byrna Score with sleep and weight logging. The daily verse and devotional are free too and always will be — they are not behind the paywall. Premium adds the AI coach, food logging, and deeper analytics.
Does the AI coach actually understand lifting, or is it just a chatbot?
It edits your real program, which is the difference. Before you type a word it already knows your goal, your current program, your injuries, your macros, and your last five sessions. Tell it your shoulder hurts and to take the week lighter, and it swaps the exercise and pulls your volume back — the change is live on your calendar, not just a message in a chat window. It is coaching guidance, though, not medical advice, and it is not a substitute for a professional.
When will byrna be on Android?
byrna is iPhone-only right now, and we would rather tell you that plainly than promise a date we can't yet commit to. If Android matters to you, email us — that demand is genuinely part of how the decision gets made.
How accurate is the photo-based meal logging?
It's a well-informed estimate, not a laboratory measurement. Point your camera at a plate or describe it in a sentence and byrna estimates calories and macros — close enough to be useful for tracking consistency and trends over weeks, which is what actually moves your results. You can edit any entry it gets wrong. If you need exact numbers for a medical reason, weigh and log your food manually.
Something we didn't cover? Email buckaiden40@gmail.com — it goes straight to Aiden.
Start training today.
byrna is on iPhone: your program, your AI coach, and a daily verse and devotional. Download free and start your 1-week trial.
Download on the App Store