Synthesia Basic Free plan (10 minutes of AI avatar video per month)
Synthesia
Basic plan at 0 per month: 500 credits per month, including a free allowance of 10 minutes of video creation or dubbing per month, videos up to 3 minutes each, exports carry a Synthesia watermark
Official pricing page (rendered in a browser), Basic card verbatim: "¥0 per month · 500 CREDITS / MONTH · Free allowance", "Videos carry a Synthesia watermark". The usage estimator says "100 credits per minute · first 10 min included on every plan"; the usage-limit row says "10 minutes of video / month"; the feature table lists Video length as "Up to 3 minutes". There is also a promo credits row, "2,000 credits, limited time only", with no end date stated.
Free-tier videos carry a watermark; removing the Synthesia logo and downloading content start from the Starter plan, per the official page. The pricing page shows the currency of the visitor's region (0 yuan when visited from China). The page does not say whether a credit card is needed to sign up, and access from mainland China was not tested.