v1.0.1 iOS · Android · free · source available

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 built one. Android is live on the Play Store now; iOS App Store approval is in progress.

Google Play → iOS · App Store Soon

iOS + Android · one React Native codebase · Android on Play Store · iOS in review

program: 5/3/1 + BBB
cycle: 4 sessions / lift · your schedule
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

Source available. 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. At the end of each cycle the TM bumps. That's basically it. The app does the math; I just wanted a nicer way to see it.

Day

Set 1

Set 2

Set 3

Scheme

Day 01

65% × 5

75% × 5

85% × 5AMRAP

5·5·5+

Day 02

70% × 3

80% × 3

90% × 3AMRAP

3·3·3+

Day 03

75% × 5

85% × 3

95% × 1AMRAP

5·3·1+

Day 04

—

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, cycle over cycle.

Cycle

D15·5·5+

D23·3·3+

D35·3·1+

D4TM 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

Real screenshots.
No mock-ups.

Actual device captures from the Android build. Before the session, during the AMRAP, the receipt after, and the PR certificate. This is exactly what you see.

01 · TodayAndroid

531 Strength today screen: Bench, Cycle 2 Day 1, plate diagram 45+10 per side, working sets 155 / 175 / 200 LB, START SESSION

02 · LiveAndroid

531 Strength live session: Bench now., AMRAP set 200 LB × 5+, LOG AMRAP sheet with e1RM 233 LB

03 · ReceiptAndroid

531 Strength session receipt: In the book., new record stamp, PR certificate 222 LB e1RM +25 LB, CLOSE THE DAY

04 · PRAndroid

531 Strength PR Certificate: YOU HIT A NEW BENCH PR, Stronger., 222 LB, +25 LB vs 197 LB

05 · Free tools

Run your
numbers.

Web versions of the calculators built into the app - no download required. Shareable permanent links for forums and fitness communities.

/tools/plate-math

→

Plate calculator.

Enter a target weight, pick your bar, see exactly which plates load per side. lbs and kg.

/tools/goal-calendar

→

Goal calendar.

Set a target training max and see how many cycles it will take to get there, per lift.

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 Logger of each expedition is.

/blog

→

The receipts.

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

Get it