The best alternatives to Pledge are Charityvest, Small Token, and Zakatify. If these 3 options don't work for you, we've listed a few more alternatives below.
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Intercom for Startups— Advanced AI-powered features at a 90% discount
Open a personal charitable giving fund in 90 seconds. Make tax-deductible contributions to your fund instantly. Then, send grants to any charity in the US in two taps. Zero transaction fees. Charities receive 100% of your donation.