PiperConvert text into speech locally using downloadable voice models.
Free and open source (GPL-3.0 licence per GitHub).
Voice & avatars
Free alternatives to Synthesia
Find a free app for the parts of Synthesia you actually use.
Compare the free allowance and limitations on each app’s page. These are workflow alternatives, rather than identical copies.
Free options
Suggest an alternative →Piper
KokoroGenerate spoken audio from text using a local speech model.
Free and open source (Apache-2.0 licence per GitHub). Runs locally with no usage cap; you supply the computer.
LivePortraitAnimate a single portrait into a talking, expressive video locally with an open-weights model.
Free open-weights model that runs on your own hardware. Code licence is custom (no standard SPDX id) — check terms; the InsightFace dependency is non-commercial.