synthrs
Waitlist
Athlete at the bottom of a barbell squat, side-lit against a black background
{ periodization · fatigue · autoregulation }

Planned strength. Adjusted every set.

Synthrs is the periodized planner that tracks your fatigue and tells you what to load today. For lifters who already write their own programs.

{ closed beta · ios · android · es · en }
{ the problem }

Your program lives in a spreadsheet. Your fatigue, in your head. Your RPE, in a note on your phone. Synthrs puts them in one place.

{ 01 · periodization }

Five levels. One plan.

From macrocycle to planned exercise. Change a week and the block recalculates.

MacrocycleSeason
MesocycleHypertrophy I
MicrocycleWk 3
SessionLower A
Exercise4 × 5 @ 8
{ 02 · fatigue }

Today's readiness, in one state.

Fitness, fatigue and form updated with every set. Know whether to push or back off before you warm up.

+12TSB · optimal
FreshOptimalNeutralFatiguedOverloaded
{ 03 · autoregulation }

One number. In the set.

RPE, RIR and e1RM live. If set 2 runs heavier than planned, Synthrs adjusts set 3.

Drop 2.5 kg on set 3. RPE 9 on set 2. Target: 8.
Apply
{ gym mode }

One hand. Between sets.

Logging a set takes two taps: confirm the weight, pick the RPE. No keyboard, heart rate at 160.

52 pxMinimum tap target. Easy to hit with chalk on your fingers.
2:30Rest starts on its own and floats over any screen.
0 barsWorks offline. Everything is saved and syncs when you're back.
{ wk 3 · day 1 · set 3 of 4 }
Squat.
137.5KG × 5
SetKgRepsRPEe1RM
114058163
214059168
3137.55·
{ plan mode }

Away from the rack. No rush.

At home, the light theme. Write your block, adopt a program or review how your body handled the last load.

{ hypertrophy i · block 2 of 4 }
Weekly volume.
18.4T · WK 3
14.2
W1
16.1
W2
18.4
W3
19.6
W4
20.8
W5
11
DL
{ included }
Programs.Adopt one or write your own.
Stats.e1RM, volume and tonnage per exercise.
History.Every set you've ever logged.
Achievements.Streaks and PRs. No confetti.
Chalked hands gripping a knurled barbell, close-up

Less guessing.
More logging.

{ launch pricing }

Two plans.

{ recruit }
Free.
To start logging.
  • Set logging with RPE and RIR
  • Rest timer
  • Full history
  • One active program
Join the waitlist
{ operator }PRO
$79.99/ YEAR
Works out to $6.67 a month.
  • Everything in Recruit
  • Five-level periodization
  • Fatigue model and daily readiness
  • Live load suggestions
  • Stats by block and exercise
Join the waitlist
{ faq }

What people usually ask.

We're in closed beta on iOS and Android. Join the waitlist to get in before launch. We'll email you the day it opens.

No. Adopt a program and Synthrs periodizes it for you. If you already write your own, you control all five levels.

Yes. Everything is saved on your phone and syncs when you're back online.

English and Spanish. Units in kg or lb.

You move to Recruit unless you subscribe. Your history stays with you.

Athlete seen from behind in front of a squat rack, backlit
{ waitlist · ios · android }

Every kilo, for a reason.

Synthrs is in development. Leave your email and get into the beta before anyone else. One email, no spam.