精進 · shōjin — diligence
Log lifts.See real progress.
A fast, private strength tracker that gets out of your way — and tells you what to put on the bar next.
Four guides, with the sources attached. Built in the open by one person who trains five days a week. Changelog →
What it does
Built for the gym floor, not the feed
The one that matters
Log a set in seconds
Weight, reps, RPE, done. Warm-ups, drop sets, supersets, per-set notes, plate math, and a rest timer that keeps time through a locked phone.
tap-to-apply ·82.5 kg
e1RM ↑ 4.2%
Progress you can trust
One-rep-max charts, records, volume and a training heatmap — computed from published formulas, not vibes.
Back · 12/16 sets
Weekly muscle targets
Evidence-based weekly set targets per muscle. A healthy “legs” number can’t hide starved hamstrings.
The science
The math is public
Every number Shojin shows you has a formula behind it, and none of them are secret. Progress charts use the blend of three published one-rep-max estimates — Epley, Brzycki, Lombardi. Weekly targets come from volume landmarks in the hypertrophy literature. And the suggestion under every exercise follows three plain rules:
- top set felt RPE ≤ 8 → add one increment
- RPE 9–10 → hold the weight
- reps down two hard sessions running → deload ~5%
One bad day never flags a lift as stalled — it takes two consecutive non-increase sessions. Warm-ups and drop sets never drive the verdict.
Try it — last session’s top set
80 kg × 5barbell bench
How hard was it?
2 reps left in the tank
Next session
Go up · 82.5 kg
top-set RPE ≤ 8 → add one barbell increment (+2.5 kg)
Guides
The evidence, in plain English
The questions lifters actually ask — answered from the published research, with every source listed.
All guides →The app
Quiet design, loud numbers
Three screens carry the whole product. None of them ask for your attention twice.
01 · Logger
The logger keeps its mouth shut
Set rows, RPE, rest timer, plate math. No streak nags, no popups mid-set — and the suggestion for next session sits one tap away, not in your face.
02 · Progress
Charts that don’t flatter you
Blended e1RM from three published formulas, weekly sets per muscle, and a heatmap of what you actually did. If a lift stalled, you’ll see it stall.
03 · History
Every session, one scroll
Notes, readiness check-ins and comments kept with the sets they belong to. Repeat any session, or edit one you logged three weeks ago.
The rest of the kit
Everything else, quietly
Templates that save time
Build a routine once, start it with a tap. Pin form cues to any exercise so your setup notes are one glance away.
Train with your crew
An invite-only Training Circle: weekly activity boards, kudos, and a Sunday “Week Wrapped”. No feed, no strangers, no DMs.
Your data is yours
No ads, no third-party trackers. Import from Strong or Hevy, export CSV or a full JSON backup, delete everything from inside the app.
FAQ
Fair questions
Is Shojin free?+
Free to start — everything on this page costs nothing today. If paid features arrive later, we’ll say so plainly before anything changes.
Is there an iPhone app?+
Yes — Shojin is on the App Store. On any other phone it runs in your browser and installs to your home screen like a native app.
Where does my data live?+
In your account, locked to your user at the database level — nobody else can read it. Export a CSV of your sets or a full JSON backup anytime, and delete your account and every row of your data from inside the app.
Can I bring my history from Strong or Hevy?+
Yes. Export a CSV from either app and import it in Shojin — your workouts come across and exercises are matched to Shojin’s catalog automatically.
What’s RPE and do I have to use it?+
Rating of perceived exertion, 0–10 — effectively how many reps you had left (RPE 8 ≈ two in the tank). It’s optional, but logging it is what lets Shojin judge when you should add weight and when to back off.
Is the Training Circle public?+
No. Circles are optional and invite-only. A small group you chose sees each other’s weekly training activity — nothing is public, and you can leave anytime.
Show up. Log the work.
Coming from Strong or Hevy? Bring your history with you — CSV in, nothing left behind. The next step is always a small one; that’s the point.
Free to start · No ads · No third-party trackers