One tap in the morning
How do you feel today? That single answer is the only thing Kelva needs. Everything else is optional and the app says on screen which inputs actually counted.
Strength training for women
Some weeks run themselves. Others feel twice as heavy.
On exactly the same plan. Most training apps do not know the difference and show you the same session whether you slept seven hours or four. Kelva adjusts today's session to how recovered you actually are, and leaves your programme alone.
Download on the App Store
About the cycle, honestly
We do not tell you to train differently in a particular phase.
The evidence does not support it. A 2023 systematic review found no influence of cycle phase on strength performance or on training adaptation, so an app that hands you a phase-to-workout chart is selling something it cannot back.
What is evidenced is something else: hormonal fluctuation affects energy, perceived exertion and recovery. That is what Kelva measures in you, rather than reading it off a diagram.
What Kelva works from
Three inputs. Only the first one is required.
Your sleep, against your own average
Read from Apple Health and measured against your baseline, not a textbook number. Below seven nights it is deliberately ignored rather than guessed at.
Your cycle day, as context
It explains why a day feels different. It is never an instruction, and it never moves the plan by itself.
The programme stays put
Progress comes from consistency and progressive overload, not from a plan rebuilt every week. Kelva changes today: a little less volume, a lower target, or a deliberate deload. Tomorrow your plan is where you left it.
It gets better the longer you use it
After four cycles the app knows your pattern rather than a diagram's. That is the opposite of an app you stop opening in week three.
One person, not a feed
Link a friend and she sees exactly one thing: whether you finished your planned week. Not your cycle, not your sleep, not your check-ins, not what or how heavy you trained.
Your data stays on your device
Sleep, cycle and your daily check-ins are stored and calculated on your iPhone. They are not sent to our server, not held in any backup of ours, and not passed on.
That is not a statement of intent. There is no endpoint for these values. Sleep and cycle are authorised separately, and nothing is ever written back to Apple Health.
Your plan stays. Today adapts.
Free to start. Kelva Plus takes the adjusting off your hands.
Download on the App Store