Users who list fewer companies will still receive the alerts free, company officials said.
An in-home Wi-Fi alert-free zone can be configured, so you're not constantly being alerted as you move about your house.
The top apps are as varied as games like Traffic Rush, above, or GPS-driven tools like Trapster Speed Trap Alert (a free product).
As Diane Ackerman has put it, "For a compulsively pensive person, to be fully alert but free of thought is a form of ecstasy".
Spoiler Alert is free for companies that donate food and plans to monetize by taking a commission on discounted food sales and adding a software-as-a-service subscription for businesses that need to keep accounting and tax documents.
To sign up for Prime Family Alert, a free, bi-monthly e-newsletter, click here.
Placing a fraud alert is free and (without an official identity theft report) lasts for 90 days.
But it engrossed many Yorkshire folk, who had been alerted to free entry after 5pm when Headingley became infuriatingly sun-drenched.
The emergency alerts are free and usually enabled on a phone by default, and they do not count against any text-message limits in your monthly data plan.
The authority will send out the alerts for free, but users may incur charges for incoming text messages, depending on their service plan.
