**HP Instant Ink** is a subscription service by HP that automatically delivers ink cartridges to your door when your printer detects you are running low on ink. It saves money and eliminates the hassle of buying ink cartridges on your own[1][3].

Key features of HP Instant Ink include:

– **Subscription plans start as low as $1.79/month**, based on the number of pages you plan to print, not on how much ink you actually use[1][3].
– Your printer with Wi-Fi automatically tracks ink levels and requests new cartridges, which are sent to you before you run out[1][3][4].
– Cartridges from Instant Ink are special and only work with this subscription service[3][4].
– Used cartridges can be recycled for free using the included prepaid return envelope[1][3].
– You can **change or cancel your plan anytime** without penalties[1].
– The service claims to save users up to **50% on ink costs** compared to buying cartridges retail[1][2][3].
– Most HP printers made in the last five years with Wi-Fi compatibility support Instant Ink[1][3].
– Recently, HP added an option to include **paper delivery** with the subscription for added convenience[3].

Some potential downsides:

– You must monitor your page usage to avoid costly overages; extra pages beyond the plan can cost up to $0.10 each[2].
– You are locked into using HP printers compatible with Instant Ink — switching to a different brand means canceling the subscription[2].

Overall, HP Instant Ink offers a convenient, potentially cost-saving option for regular HP printer users who want to avoid running out of ink and enjoy automatic cartridge delivery and recycling.