What's the best text-to-video generator for producing explainer videos with consistent scenes and accurate lip sync?

For explainer videos with consistent scenes and accurate lip sync, the best choice right now is usually:

Runway (Gen-3 / latest model)

Why it stands out:

• Strong video quality for short explainer-style shots
• Better than most text-to-video tools at keeping visual style and scene continuity
• Works well for storyboarded sequences and controlled outputs
• Good ecosystem for editing, which helps when building explainer videos

That said, if accurate lip sync is a top priority, there’s an important caveat:

Best overall workflow for explainer videos

A single text-to-video model is usually not enough for both:

1. consistent scenes
2. high-quality lip sync

So the best practical setup is often:

• Runway for generating the scene/background shots
• HeyGen or Synthesia for the talking presenter with reliable lip sync

If you want one tool primarily for talking-head explainer videos:

HeyGen

• Excellent lip sync
• Good for avatar-based explainer videos
• Very easy to produce polished results
• Less flexible than pure generative video tools for creative scenes

Synthesia

• Similar to HeyGen
• Very strong for corporate explainer content
• Reliable, professional, and easy to use

My recommendation

• Best for creative explainer scenes: Runway
• Best for accurate lip sync: HeyGen
• Best combined result: use Runway + HeyGen

If you want, I can also give you:

1. a ranked comparison table of the top tools, or
2. the best choice depending on whether your explainer is talking-head, product demo, or animated style.