Better Proposals is a genuine peer — it targets freelancers and small businesses, has attractive templates, and supports payment through Stripe and PayPal. If you enjoy designing a proposal and want a deep gallery to start from, it is a good tool.
The difference is where the work goes. Better Proposals gives you templates to fill in; Tendrly writes the proposal for you. You answer five questions and Tendrly drafts the overview, scope, timeline and terms, brands it in your colours, and produces a web page and a matching PDF with the Stripe payment link already in it.
Both let clients pay, which is the important part. Tendrly’s wedge is that the writing is done for you and the pricing is flat: free to start, then $19/month for 25 proposals, at 3.5% + 30¢, charged only when a proposal is actually paid.