Works fully offline
Every read and write hits your phone first. No signal in the basement gym is not a problem. Sync catches up when you are back online.
adaptive lifting · offline-first
Train by the numbers that actually move.
Most apps log what you already did. Knurl tells you what to lift next. It learns your strength from every set and prescribes the load, inside the bands that build it. All of it works offline at the gym.
Coming soon toGoogle Play
Open the web app
Free to log forever. Pro from $5/month with a 14-day trial.
A logbook records the past.
It never tells you what to do next.
You guess the weight, hope it was enough, and write it down. Knurl closes the loop. Every set you log sharpens an estimate of your real strength, and that estimate drives your next prescription.
The core idea
Adaptive loading you can actually see
Knurl prescribes a percentage of your estimated max, then shows the zone that percentage lands in. The science is on screen, not hidden behind a black box.
- 01
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It estimates your 1RM
Each logged set updates a per-lift estimate, weighted by Epley and Brzycki math, rep quality, RPE and how recent the work is.
- 02
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It prescribes the load
Your next set is a percentage of that estimate, placed inside Prilepin-derived rep and volume bands so the dose drives adaptation.
- 03
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It adjusts to you
Readiness and auto-deload nudge loads up or down. Hit a stall and Knurl backs off before you dig a hole.
From the first set to the next PR
Three steps, one tight loop. The more you log, the smarter your loads get.
1
Pick or generate a program
Choose from 60 built-in programs, answer six questions to find your match, or generate a periodized plan from scratch.
2
Log your sets at the gym
Weight and reps, a quick block RPE, optional readiness. Everything saves instantly and works with no signal.
3
Get your next target
Knurl updates your strength estimate and prescribes the next load, adjusted for readiness and fatigue.
Built for serious lifters
Everything you need under the bar
Depth where it counts, with none of the social-feed clutter.
60 built-in programs
Linear progression, 5/3/1, PPL, upper/lower, GPP and more. Tagged by goal, experience, days per week and equipment.
Workout generator
Set your goal, weeks, days and equipment. Get a full periodized program built for you, with graceful fallbacks when gear is short.
Find a program
Answer six questions and see your top matches, each with a plain reason for why it fits your goal, schedule and equipment.
Garmin FIT import
Drop in a FIT file and overlay heart rate on your strength session, aligned to your set timestamps.
Charts that show the math
Per-lift trend with the Prilepin band, PR anchors, a LOESS overlay and a calendar heatmap. The estimate is never a black box.
XP, streaks and quests
Earn XP on every set, hold a weekly streak and chase Monday quests. Progress you can feel between PRs.
Plate calculator and units
Per-side plate math for any target and bar, plus a true lb and kg toggle across display, input and storage.
Your data, exportable
Export a CSV workbook or a full JSON snapshot any time. Offline-first sync is scoped to you, with no behavioral analytics.
Simple, honest pricing
Log forever for free. Unlock the smart programming and stats when you want them. No ads, no annual lock-in.
14-day free trial
Pro
Smart programming and advanced stats.
$5/month
billed monthly through Google Play
Coming soon toGoogle Play
| What you get | Free | Pro |
|---|---|---|
| Workout logging | ||
| Your full history and charts | ||
| Offline-first in the gym | ||
| Plate calculator and lb/kg toggle | ||
| CSV and JSON data export | ||
| Curated program library (60 programs) | – | |
| Workout generator | – | |
| Find-a-program wizard | – | |
| Advanced stats readiness, auto-deload, crowd-calibrated 1RM posteriors | – |
- 14-day free trial
- No annual lock-in
- Cancel anytime
- No ads, ever
Private by default
Knurl is built to be great for the lifter using it, not to mine them.
Offline-first by design
Your phone is the source of truth. The cloud is just a backup that catches up later.
Your data stays yours
Export a CSV workbook or full JSON snapshot whenever you like. Leaving is always easy.
No behavioral analytics
Sync is scoped to your account. No tracking pixels, no ad networks, no data resale.
Questions, answered
What platforms does Knurl run on?
Knurl launches on Android first through Google Play. It also runs in any modern browser as an installable web app. iOS comes later once Android gains traction.
Does it really work without signal?
Yes. Knurl is offline-first. Everything you log writes to your phone immediately, and a background queue syncs to the cloud when you reconnect. The gym basement is fine.
How does the adaptive loading work?
Knurl estimates your 1RM per lift from every set you log, weighting recent and higher-quality work more. It then prescribes your next set as a percentage of that estimate, inside Prilepin-derived rep and volume bands.
What is free and what costs money?
Logging your workouts and viewing your own history and charts are free forever. Pro unlocks the curated program library, the workout generator, the find-a-program wizard and advanced stats. Pro is $5 a month with a 14-day free trial.
Do I own my data?
Always. You can export a CSV workbook or a full JSON snapshot at any time. Sync is scoped to your account with no behavioral analytics and no data resale.
Can I bring my own programs?
Yes. You can log ad-hoc against a 13,000-plus exercise library, follow a built-in program, or generate one. Equipment profiles substitute movements to match the gear you actually have.
Stop guessing the weight.
Let your training tell you what to lift next. Free to start, $5 a month when you want the smart stuff.
Coming soon toGoogle Play
Open the web app