Lathr Support

Lathr is a soap-making calculator for lye, oils and batch costing.

For help, email hello@lavenderinkstudios.com and include "Lathr Support" in your email subject.

Frequently asked questions

How do I restore a purchase?

If you previously purchased Lathr Pro, look for the restore-purchase option within the app. If you cannot find it or a purchase is not restored, contact us at the email above.

Is Pro a subscription?

No. Lathr Pro is a one-time $14.99 unlock.

Do I need an account?

No. An account is not required to use Lathr.

Where is my calculation data kept?

Calculation data stays on your device.

Is Lathr available for iPad?

The submitted iOS 1.0 version is iPhone-only.

How do I report a calculation issue?

Email hello@lavenderinkstudios.com with your app version, the relevant oils and lye/SAP inputs, the units used, the result you expected, and the result you received. Please avoid sending payment information or other sensitive personal data.