Local-first. Transparent math. Works offline.

Fast, reliable peptide calculations — offline.

A peptide calculator for concentration + unit math from your inputs, plus a Today view, one-step vial setup, schedules with on-device reminders, records with trends, and inventory. All on device, on iPhone, iPad, iPhone Duo and Android.

See screenshots How it works →

For informational and organizational use only. Not medical advice. Verify all calculations independently.

Today with the entry due now, Complete and Skip, the rest of the day and vial status

New in version 2.0

A complete redesign, built around your day.

Open the app and see what is due. Record it in one tap, and the vial updates itself.

Today: what is due now, the rest of your day, your streak and your vials.
Set up a vial in one step. The preparation and its vial are saved together.
Schedule: a week view with each day's entries, plus the month calendar.
Trends: completion rate, streaks and a 30-day chart in Records.
Two-column layouts on iPad, Android tablets and the iPhone Duo, and a light mode.

See what's new

Set up a vial: amount, diluent and target in one screen, with 20 units per measurement

Works offline

No accounts, no servers required. Calculations and records live on your device.

Local-first data

PepCalc Pro doesn’t collect analytics or track you. Exports are user-initiated only.

Transparent math

Optional “show your work” view makes results easy to verify independently.

Highlights

Built for the workflow, not just the math.

Save preparations, create schedules, keep records, and track inventory with a clean, focused interface.

Explore features See the flow

Today, at a glance

The entry due now with Complete and Skip, the rest of the day with Undo, your streak, and how much is left in each vial.

Calculator with unit gauge visualization

Units and mL on a clear gauge, with an optional show-math view. Blend mode handles vials with 2 to 6 components.

Schedules with reminders

Daily, weekly or custom days, several times a day, with on-device notifications. No remote servers involved.

Records and trends

Completed and skipped entries with exact amounts, plus 7, 30 and 90-day completion trends.

Inventory tracking

Each vial's balance, run-out date and expiry, with alerts before either and a full history.

Every screen

Made for iPhone Duo, iPad and Android tablets.

On a larger screen, PepCalc Pro uses two columns. Unfold an iPhone Duo and the columns meet exactly at the fold, so nothing sits on the crease, and the tab rail never covers your content.

PepCalc Pro on iPhone Duo, unfolded: today's entries on the left of the fold, vials on the right — iPhone Duo, unfolded: Today splits at the fold.

Calculator on iPhone Duo, unfolded: inputs on the left, the result on the right — The result stays beside the inputs while you type.

Records on iPad in landscape: the list on the left, 30-day trends on the right — iPad: records beside their trends. Android tablets work the same way.

Get PepCalc Pro

One purchase, every feature. No account, no subscription, and your data stays on your device. For iPhone, iPad and Android.

Need help or want to suggest an improvement?

We aim to respond within 2–3 business days.

Contact support Enhancement request