Every subscription contains a number of clients that are stored in your client list. The number of clients is the maximal amount of clients you can save and use in your account with your subscription.
The number of clients differs for subscriptions.

Free - unlimited expenses
Starter - unlimited invoices, expenses, credit notes and pro-forma invoices
Standard and Premium - all document types are unlimited (estimates/quotes, orders, delivery notes, etc.)

Older subscriptions (also recurring) bought before June 2021 have document limits. Starter 24 invoices p.a., Standard 300 invoices and other documents p.a.

When reaching the client limit, the best options is to upgrade to a higher subscription plan. With our Premium subscription there's no limit on saved clients! Take a look here to learn more.

Send us a message or an email with a proof of  purchase (invoice from Apple or Google). We will activate your subscription ASAP.

Also check for the displayed message - maybe you've ran out of clients, documents or you try to create a document (quote, estimate) or use a feature beyond your current subscription.

You can upgrade to a higher subscription to use more Billdu benefits. Make sure to upgrade with the same service (Apple AppStore, Google Play Store) or contact our team which can reply to you with an upgrade link.
Take a look here to learn more about possible upgrades with Billdu.

• For subscriptions bought on your iPhone or iPad, you get a bill from Apple - click here.
  Learn more at Apple help.

• For subscriptions bought on your Android device, you get a bill from Google - click here.
  Learn more at Google help.

• For subscription bought on our website, click here or log in to our website and navigate to Settings - Subscription - Orders and invoices