Changing the duration of your subscription, like going from a monthly plan to a yearly plan, on Robokiller is easy. Here's a step-by-step guide based on where you're subscribed:

App Store

1. Open the App Store on your iPhone.
2. Tap your profile icon in the top right corner.
3. Choose Subscriptions.
4. Find and tap on Robokiller.
5. Under Robokiller, select the membership you'd like to switch to.

Website

1. Visit www.robokiller.com.
2. Click on Sign In to access your account.
3. Navigate to Manage Subscription.
4. Choose Update Plan.

For Android users subscribed through the Google Play Store, it's currently impossible to directly switch from monthly to yearly, or vice-versa. You will need to cancel your current subscription and then resubscribe for the plan and duration you'd like.