You should give DronaHQ a spin for this. I have used it to build a simple frontend app, connect my sales lead maintained on a google sheet and streamline some activities (assigning leads, edit information,send email, track payment/subscription) They offer ready connectors so you can plug it to your data source of choice. I am pretty satisfied with the tool (https://www.dronahq.com)

You should also consider DronaHQ, https://www.dronahq.com/

Once developed, app can be deployed both in mobile and as a web app. Notifications and Emails are easy to set up with ready connectors!

Good suggestion...I haven't dug in deeply, but do you know what 'tasks' are in this case? Is that user logins, writes to DB, integration requests or?

DronaHQ Co-Founder here.

We are consumption based priced. We have prepackaged consumption based plans which are available. Our currency of measuring consumption of our service is 'Task'. Say any API/service call is a task & so is any BPM workflow block used while designing the system. Hope this helps.

Interesting, Is this a nocode tool?