The built-in AI features can help you write more compelling copy for your popups

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OptinMonster offers advanced targeting and display rules to show specific popups to users who are more likely to convert.
It integrates directly with several email marketing services, allowing you to send signup details directly to your email newsletter.
Disadvantages:

There is no free plan.
Why we recommend OptinMonster: Sending an email newsletter is one of the best ways to let your donors know about your cause and get more donations. With OptinMonster, you can easily get more leads and email signups for your nonprofit.

GiveWP is another popular WordPress plugin that makes it easy list of germany cell phone number for nonprofits to accept online donations. It's ideal for larger nonprofits that need advanced features, detailed reporting, and scalability. Charitable, on the other hand, is better suited if you want to build a nonprofit website yourself.

GiveWP allows you to create beautiful donation forms and choose from a variety of display and payment options.

You can accept one-time or recurring donations, create peer-to-peer fundraising campaigns, enable recognition, set campaign-level donation goals and incentives, and more.

We especially like the donor management and fundraising insights, which help you keep track of your contributions and measure the success of your fundraising campaigns.

GiveWP integrates with payment processors like Stripe, Authorize.net, PayPal, Braintree, Square, and more. It also integrates with email marketing services so you can stay in touch with your donors.