v1.0 iOS · Android · free · open source

A 5/3/1 tracker.
That I built for myself.

I'm a developer, not a fitness coach. I run Wendler's 5/3/1 in my own off-brand way and wanted a nicer way to log it than my notes app. So I made one — and put it on the App Store and Play Store in case anyone else wants to try it.

Download Android Preview → How it works

program: 5/3/1 + BBB
cycle: 4 weeks · 16 sessions
data: local only
price: $0 · no IAP

Platforms

iOS+ Android

One React Native codebase. Shipped from a single repo.

Storage

100% local

SQLite in the app sandbox. No accounts, no cloud, no sync.

Telemetry

0events

No analytics, no crash reporter, no ad SDKs. Promise.

Price

$0free

Open source. No paywall. No "pro" tier. No subscription.

Units

lb+ kg

Both unit systems, throughout. Plates, training maxes, history — flip in Settings and everything re-snaps to the destination unit.

01 · The program

How a cycle
actually goes.

Wendler's 5/3/1 is three working sets off a "training max" — a number slightly lower than your real 1RM. The last set is an AMRAP. Every four weeks the TM bumps. That's basically it. The app does the math; I just wanted a nicer way to see it.

Week

Set 1

Set 2

Set 3

Scheme

Week01

65% × 5

75% × 5

85% × 5AMRAP

5·5·5+

Week02

70% × 3

80% × 3

90% × 3AMRAP

3·3·3+

Week03

75% × 5

85% × 3

95% × 1AMRAP

5·3·1+

Week04

—

100% × 3–5

TM Test

For this lift

+10lb

per cycle

or +5 kg

A cycle is 4 sessions of this lift — not 4 calendar weeks. Each lift runs its own cycle, so you set your own pace.

Run your numbers

Current

training max

225lb

Goal

training max

315lb

Est. work days / week

for this lift

~16 work days away

≈ 4 mo at 3/wk

Friendly note

I'm not affiliated with Jim Wendler and this isn't an officially sanctioned 5/3/1 anything — I just like the program and wanted a clean place to log it. If you're serious about the method, please read 5/3/1: The Simplest and Most Effective Training System first. The book is the source of truth.

I also took a few liberties — the assistance section is freeform, warm-ups are optional, you can skip BBB. If you're a purist, that might bother you. Sorry.

No spreadsheet required.
Just show up and do the work.

why · this · exists

02 · The plate math

Which plates,
which side.

Given a target weight and the plates you own, the app fills heaviest first. Each plate is drawn to its real-life diameter so you can eyeball-confirm the load. Imperial or metric, your bar weight, your plate set — set it once.

Target weight

250 lbs

The app fills heaviest-first. Each plate is drawn to its real-life diameter so you can eyeball-confirm the load. The numbers below update as you change the target — same greedy decomposition the real app runs between sets.

Per side

102.5 lbs

Bar

45 lbs

Plates

4 ea

2.5

PER SIDE 2× 45 + 10 + 2.5 = 102.5 lb

03 · The long view

Cycles
stacked.

Every top set you've logged, in order. The training max climbs in the last column. I find this view more useful than any chart — you can see what you actually did, week over week.

Cycle

W15·5·5+

W23·3·3+

W35·3·1+

W4TM Test

TM→ Next

C01

215× 7

230× 4

240× 2

255× 5

255lbs

C02

225× 8

240× 5

250× 3

265× 5

265lbs

C03

235× 6

250× 3

260—

275—

275lbs

C04

245—

260—

270—

285—

285lbs

Training max275 lbs

Best e1RM310 lbs

Cycle03 rolling

Sessions filed32

The number that matters is whichever number you decide matters. I mostly look at e1RM, which the app estimates from your AMRAP using Epley. Your mileage may vary.

04 · The product

The screens
themselves.

Three core screens per workout. Pick a lift, lift, log. The rail is scrollable — drag to see iOS and Android side by side.

01 · HomeiOS

9:41

SQUAT

BENCH

DEAD

CYCLE 03 · DAY 2

Bench.

TOP SET 90% TM · TM 185 LB

170 LB × 3+

THIS CYCLE

5·5·5+

✓

3·3·3+

5·3·1+

TM TEST

185 LB

BEST e1RM

215

CYCLE

ROLLING

SEE PROGRESS →

BEGIN SESSION→

TODAY

PROGRESS

HISTORY

YOU

02 · LiveiOS

9:41

FINAL SET · 66% DONE

Squat now.

AMRAP

ON THE BAR · 90% TM

250 LB × 3+

2.5

PER SIDE 2× 45 + 10 + 2.5 = 102.5 lb

LOG AMRAP→

03 · HistoryAndroid

9:41

THE RECORD

History.

SESSIONS FILED

PERSONAL RECORDS

TOTAL VOLUME

128K LB

★ BEST · BENCH 215 LB · 12-DAY STREAK

ALL 32

★ PRS 5

SQUAT

BENCH

CYCLE 03 3 of 4 done · 1 PR

Squat

TODAY

★ PR

C3 · D2

47m

Bench

YESTERDAY

C3 · D2

38m

Dead

SAT · MAY 17

C3 · D2

52m

TODAY

PROGRESS

HISTORY

YOU

04 · PlanAndroid

9:41

TUE · MAY 19 · 3·3·3+

Squat.

WORKING SETS TM 275 LB

01 195LB × 3 70%

02 220LB × 3 80%

03 250LB × 3+ AMRAP 90%

BBB · OPTIONAL 5 × 10 @ 50%

BBB 140LB × 10 50%

START SESSION→

A note

Not by me,
exactly.

Honest disclosure: I don't write most of the code in this app directly. A coding agent does the work on a 30-minute schedule and writes about what changed. I file the asks and review the result. If that's interesting, there are two pages on it.

/process

→

The rubric.

How a 30-minute loop goes, the rules the agent has to keep, and who the scribe is this week.

/dev-log

→

The receipts.

63 posts, one per loop — what shipped, what was tried, what broke. Updated every half hour, give or take.

Get it