Comparison

531 Strength vs Armstrong Pull

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

531 Strength

This app simplifies tracking your progress on the 5/3/1 strength training program. It calculates and displays weights, reps, and sets based on your one-rep max, allowing you to easily plan and execute your workouts. Rounding options help match available gym plates.

Highlights
  • Calculate 5/3/1 weights
  • Track 1RM for exercises
  • View cycle step weights
  • Round weights to available plates
  • Full overview of weights, reps, sets
Features
Read full description

Makes it quick and easy to get a full overview of all weights, reps and sets based off your 1RM when you’re following the 5/3/1 program. - Save your current 1 RM for each of the four exercises - View calculated weights for each step in the cycle - Round the weight to match the plates you have available This app is made for people who are familiar with the structure of the 5/3/1 program and who needs simple access to the calculated weights for each exercise.

About

Armstrong Pull

This application provides a structured visual guide for the Armstrong Pullup Program. It outlines daily routines, including maximum effort sets, pyramid training, and varied grip techniques, to help users progressively increase their pull-up numbers.

Highlights
  • Daily workout routines
  • Maximum effort set tracking
  • Pyramid training guide
  • Varied grip training
  • Visual progress guide
  • Repeat hardest day option
Features
Read full description

Day 1 The Armstrong Pullup Program Tracker is a one page visual guide to the program Five maximum effort sets. Rest 90 seconds between each set. Do not concern yourself with numbers. You will find that you will increase the numbers in the last two sets before you see much improvement in the first three. Make sure that each set is a maximum effort set. Day 2 Pyramid Day. Start the pyramid with one repetition, the next set has two repetitions, the next has three. Continue in this fashion until you miss a set. (e.g. your last set was five, your next set would be six, but you could only do four. You missed a set) Do one more set at a maximum effort. Rest 10 seconds for each repetition in the previous set. Day 3 Do three training sets with a normal overhand grip. Rest 60 seconds between each set. Do three training sets gripping the bar so that your palms are toward your face and your little fingers are touching each other. Do three training sets with wide grip. Rest 60 seconds between each set. Day 4 Do the maximum number of training sets that you can accomplish. Rest 60 seconds between each set. You do training sets until you fail to do perfect training set. This day can wind up being the longest training day as you continue with the program because you will find it easy to do lots of training sets. Day 5 Repeat the day that you found to be the hardest in the previous four days. This will change from week to week.

Screenshots

531 Strength4 screens
Armstrong Pull4 screens

Verdict

The call

The clearest difference is review sentiment: 531 Strength at 94% against Armstrong Pull's 25%. 531 Strength also leads on rating (4.9 vs 2.0) and ratings volume (12K vs 3). Armstrong Pull's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price, update cadence and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. 531 Strength sells 4 one-off in-app purchases. Armstrong Pull asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

531 Strength holds the better App Store score, 4.9 against 2.0. That said, the two scores are not equally well evidenced: 531 Strength has 12K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 94% of 531 Strength's written reviews are positive against 25% of Armstrong Pull's.

UpkeepUpdate frequency

531 Strength ships an update every 2 months, Armstrong Pull every 4 weeks. The most recent releases landed on October 31, 2026 and October 24, 2026 respectively.

Scorecard7 real differences · 3 level
531 Strength versus Armstrong Pull: the parameters behind the verdict, then further details
Parameter531 StrengthArmstrong Pull
PriceFreeFree
Rating4.9 (12K ratings) — better2.0 (3 ratings)
Positive reviews94.0% of reviews — better25.0% of reviews
Number of ratings12K — better3
Update frequencyEvery 2 monthsEvery 4 weeks — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.010.0 — better
Further details — not scored
Size26 MB88 MB
Age rating4+4+
DeveloperHenrik JachobsenMooncheon Song

Customer experience

531 Strength

All ratings11,645 ratings
Positive98.0%
Neutral1.2%
Negative0.8%
Written reviews282 reviews
Positive94.0%
Neutral2.8%
Negative3.2%

Armstrong Pull

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews4 reviews
Positive25.0%
Neutral25.0%
Negative50.0%

Bugs and requests

531 Strength

Reported bugs

2 issues
  • Rest timer stops when app is backgrounded
  • Plate calculator not flexible enough

Requested features

4 requests
  • Ability to adjust training max separately from 1RM
  • Option to track rep PRs and estimated 1RM
  • Accessory exercise tracking and planning
  • Sync progress across devices

Armstrong Pull

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

531 Strength

One-time4
  • Additional exercises$1.99
  • Adjustable set$1.99
  • Plate calculator$1.99
Show 1 more
  • Progress log$6.99
None

Armstrong Pull

No in-app purchases

Questions

Is 531 Strength free?
531 Strength is free to download, with in-app purchases available.
Is Armstrong Pull free?
Armstrong Pull is free to download, with no in-app purchases.
Which has better reviews, 531 Strength or Armstrong Pull?
531 Strength is rated higher. 531 Strength averages 4.9 out of 5 from 12K ratings, while Armstrong Pull averages 2.0 from 3 ratings.
Do 531 Strength or Armstrong Pull have ads?
531 Strength shows ads; Armstrong Pull does not.
Which is updated more often, 531 Strength or Armstrong Pull?
531 Strength ships an update every 2 months, and Armstrong Pull every 4 weeks. Most recently, 531 Strength was updated on October 31, 2026 and Armstrong Pull on October 24, 2026.

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