A personal training journal
Pebble started as a personal project for my own strength training on iPhone. I’m opening it to a small group to see if people who train the same way want it too.
A few things bothered me. Between sets, I wanted logging to take seconds. When an app suggested a weight, I wanted to see why. And I didn’t want points or streaks. I just wanted a clear record of the work.
So I built Pebble for myself. I named it after a pebble dropped into still water: something small lands, and what it starts keeps spreading. Each session is one more ring. I use it every time I train.
Now I want to know if it’s useful to anyone else. If you train like this, join the list and tell me how you track things today. I’ll let people in a few at a time and listen closely.
Thanks for reading.
Before you train
Your next split day is laid onto today’s page as dashed exercises, each with its last weight and when you did it. Start one and its warm-up sets appear as dashed rows.
Between sets
I wanted each set as quick as a note. One line of weight, reps and RPE, set with a thumb wheel and no typing. Pick the exercise once.
Warm-ups
Your first lift gets a full ramp. After another muscle group you’re warm. Train the same muscle again and the ramp gets shorter.
Next time
Each exercise keeps a book: a weight and a rep window. Your sets are judged against the book, not against your last set. Same history in, same plan out, and I wanted numbers I could check.
Rolled from ThuRomanian deadlift
Rolled from ThuBike · 15 min
Back squat
Skip a planned exercise or cardio and you can roll it instead. Cardio goes to tomorrow. An exercise waits for the next day that trains the same region, once the muscle has rested. It arrives marked with the day it came from. Nothing rolls on its own.
3135 lbs × 8 @ RPE 8
Bar drifted toward my face on rep 6.
A note can belong to a set, an exercise, a cardio session or the whole day. Notes gather in the day’s Notes section, each labelled with its target, with a small arrow back at the spot.
Leg ExtensionPin stack
Hip AdductionPin stack
Hack SquatPlates
Tell Pebble which machines your gym has, and whether each is a pin stack or loaded with plates. Weights stay in your gym’s own unit, and plans only use loads you can build.
Give it your days, goal and equipment, and it drafts a program with you. Each split day is laid onto the page when its turn comes.
115 lbs8 weeks140 lbs
Pebble keeps a weight and a rep window for each exercise and judges your sets against that book. A history chart shows how the book has moved.
StairMaster10m
Cardio has its own section: a checklist row with a timer. Snap the machine’s console when you finish and the photo stays with the row.
Log everything in a basement gym with no connection. It syncs once you’re back online.
Pebble reads your step count from Apple Health. It never writes anything back.
Dictate notes where your iPhone supports it. The speech is turned into text on the device.
Location is used just to get your timezone right, so each session lands on the correct day.
An iPhone on iOS 26. Pebble is iPhone only for now.
I’m opening it in small batches so I can keep up with feedback. You’ll get an email when your spot is ready.
No. Fixed rules work out your weights from the sets you logged, and the journal never goes through a model. A language model only helps when you ask Coach Pebble for a program, or when you add a new machine or exercise.
No. It’s just me, building something I use myself. It’s early, so expect rough edges and things to change as I hear from people.
I store it, plus your answers to the two optional questions, only for this waitlist. I also keep where you came from (referrer and any UTM tags) and your browser’s user agent, to see what’s working. I don’t send any email yet; I’ll write when there’s room. This page loads fonts from Google Fonts and a script from cdnjs, so those two services see your visit. There are no other trackers. Write to hello@pebble.training and I’ll delete your address.