Sync Labs Review (2026): Lip Sync API, Models, Pricing & Visual Dubbing

Last updated: 2026-07-17

Sync Labs: API-first lip sync platform with sync-3 (4K, obstruction detection), lipsync-2-pro, lipsync-2, react-1. Pay-per-second from $0.04/sec. Plans $5–$249/mo. Honest review.

Sync Labs is an API-first lip sync platform (2026) with five models: sync-3 (4K native, obstruction detection, $0.107–$0.133/sec), lipsync-2-pro (diffusion super-resolution, $0.067–$0.083/sec), lipsync-2 (fast, $0.04–$0.05/sec), lipsync-1.9.0-beta ($0.02–$0.025/sec), react-1 (expressive emotions, $0.133–$0.167/sec). Subscription plans: Free (3 gens/mo), Hobbyist $5/mo, Creator $19/mo (no watermark), Growth $49/mo (5% off, Batch API), Scale $249/mo (20% off, delegated support). Pay-per-second usage billed separately from subscription. Invoice thresholds: $6/$20/$50/$250. Python/TypeScript SDKs, OpenAPI spec, Studio playground. Best for developers building lip-sync into apps, localization pipelines, game studios.

About Sync Labs

Sync Labs (sync.so) is an API-first lip sync and visual dubbing platform developed by Synchronicity Labs Inc. The platform provides developers with programmatic access to state-of-the-art lip sync models through a RESTful API and Python/TypeScript SDKs, plus a web-based Studio playground for testing and iteration. The platform offers a family of lip sync models with varying quality/speed trade-offs: - sync-3: Most powerful model - 4K native output, built-in obstruction detection, handles extreme angles and full-shot processing. $0.107-$0.133/sec. - lipsync-2-pro: Premium quality with diffusion-based super resolution for fine facial detail (beards, teeth, facial features). $0.067-$0.083/sec. - lipsync-2: Fast, cost-efficient lip sync with solid quality for general use. $0.04-$0.05/sec. - lipsync-1.9.0-beta: Legacy fastest model for simple videos. $0.02-$0.025/sec. - react-1: Expressive lip sync with facial emotions and head movements (max 15s). $0.133-$0.167/sec. All models bill per second of output video at 25 fps (actual billing per output frame). Pricing varies by subscription tier: - Free: $0/mo, 20s max, 1 concurrent job, watermark, 3 gens/mo - Hobbyist: $5/mo, 1min max, 1 concurrent, 3 voice clones, watermark - Creator: $19/mo, 5min max, 3 concurrent, 5 voice clones, no watermark, own TTS API key - Growth: $49/mo, 10min max, 6 concurrent, 15 voice clones, 5% usage discount, Batch API, 3 team seats - Scale: $249/mo, 30min max, 15 concurrent, 50 voice clones, 20% usage discount, Batch API, 5 team seats, delegated support - Enterprise: Custom pricing Usage is billed separately from subscription - per second of generated output based on model used. Invoice thresholds: Hobbyist $6, Creator $20, Growth $50, Scale $250. Watermarks removed on Creator and above. React-1 requires paid subscription. Batch API available on Growth and Scale. Developer experience: REST API (api.sync.so), Python SDK (pip install syncsdk), TypeScript SDK (npm i @sync.so/sdk), Studio web playground, OpenAPI 3.1 spec at sync.so/openapi.json. Models: sync-3, lipsync-2, lipsync-2-pro, lipsync-1.9.0-beta, react-1. Obstruction detection built-in for sync-3, optional for lipsync-2/2-pro. Active speaker detection on Creator+. Voice cloning up to 50 on Scale. Team workspaces on Growth (3 seats) and Scale (5 seats).

Pricing

Free tier: 3 generations/month (20s max lipsync, 15s max sync-3), watermark. Hobbyist $5/mo (1min, 1 concurrent, 3 voice clones, watermark). Creator $19/mo (5min, 3 concurrent, 5 voice clones, no watermark, own TTS API key). Growth $49/mo (10min, 6 concurrent, 15 voice clones, 5% discount, Batch API, 3 seats). Scale $249/mo (30min, 15 concurrent, 50 voice clones, 20% discount, Batch API, 5 seats, delegated support). Enterprise custom. Per-second usage billed separately: lipsync-2 $0.04–$0.05/sec, lipsync-2-pro $0.067–$0.083/sec, sync-3 $0.107–$0.133/sec, lipsync-1.9.0-beta $0.02–$0.025/sec, react-1 $0.133–$0.167/sec. Growth 5% off, Scale 20% off. Invoice thresholds: Hobbyist $6, Creator $20, Growth $50, Scale $250.

Key Features

• Multi-Model Lip Sync Family: Five production models (sync-3, lipsync-2-pro, lipsync-2, lipsync-1.9.0-beta, react-1) covering quality/speed spectrum from $0.02/sec to $0.167/sec.
• 4K Native Output with Obstruction Detection: sync-3 model outputs native 4K with built-in obstruction detection for hands, microphones, glasses — handles extreme angles and full-shot processing without manual masking.
• Subscription + Usage Billing: Subscription unlocks features/durations/concurrency; usage billed per output second by model. No credits/prepay. Invoice thresholds prevent bill shock. Growth 5% off, Scale 20% off all models.
• Developer-First: API, SDKs, OpenAPI Spec: REST API at api.sync.so, Python SDK (syncsdk), TypeScript SDK (@sync.so/sdk), Studio playground, OpenAPI 3.1 spec. Python: pip install syncsdk. TypeScript: npm i @sync.so/sdk.
• Visual Dubbing & Voice Cloning: react-1 model adds expressive emotions and head movements. Voice cloning up to 50 clones on Scale plan. Active speaker detection on Creator+. Bring-your-own TTS API key on Creator+.

Pros

• Five-model family covers every quality/speed/budget need — from $0.02/sec legacy to 4K native sync-3.
• Pay-per-second usage with transparent per-model rates — no credits, no prepay, invoice thresholds prevent surprises.
• Developer-first: REST API, typed Python/TypeScript SDKs, OpenAPI spec, Studio playground, cost estimator.
• Sync-3 is uniquely powerful: 4K native, built-in obstruction detection, handles extreme angles/full shots.
• Subscription tiers scale logically: Free → Hobbyist → Creator → Growth → Scale → Enterprise with clear feature gates.
• Batch API and team workspaces on Growth/Scale for production pipelines.
• Voice cloning up to 50 clones, active speaker detection, bring-your-own TTS key on Creator+.

Cons

• React-1 model requires paid subscription (not available on Free/Hobbyist).
• Hobbyist plan still includes watermark — need Creator ($19/mo) to remove.
• Per-second pricing can accumulate quickly for high-volume sync-3 (up to $0.133/sec base).
• Maximum video duration gated by plan: Free 20s, Hobbyist 1min, Creator 5min, Growth 10min, Scale 30min.
• Lipsync-2 and lipsync-2-pro have still-frame limitation (cannot open silent lips) — only sync-3 handles this.
• Obstruction detection only built-in for sync-3; optional for lipsync-2/2-pro.
• Free tier limited to 3 generations/month with strict duration caps.

Frequently Asked Questions

What is Sync Labs and who is it for?

Sync Labs (sync.so) is an API-first lip sync and visual dubbing platform by Synchronicity Labs Inc. It provides developers with programmatic access to five lip sync models via REST API and SDKs. It's built for developers integrating lip sync into applications — video localization pipelines, game studios syncing dialogue to characters, podcast producers creating multilingual versions, AI video pipelines needing lip-sync post-processing.

How much does Sync Labs cost in 2026?

Sync Labs uses a subscription + usage model. Subscriptions: Free ($0, 3 gens/mo), Hobbyist $5/mo, Creator $19/mo, Growth $49/mo, Scale $249/mo, Enterprise custom. Usage billed per second of output: lipsync-2 $0.04–$0.05/sec, lipsync-2-pro $0.067–$0.083/sec, sync-3 $0.107–$0.133/sec, lipsync-1.9.0-beta $0.02–$0.025/sec, react-1 $0.133–$0.167/sec. Growth gets 5% off, Scale 20% off. Invoice thresholds: Hobbyist $6, Creator $20, Growth $50, Scale $250. No credits/prepay — generate and pay for what you use.

What are the different lip sync models and which should I use?

Five models: (1) sync-3 — most powerful, 4K native, built-in obstruction detection, extreme angles, $0.107–$0.133/sec. Best for production quality. (2) lipsync-2-pro — diffusion-based super-resolution for fine facial detail (beards, teeth), $0.067–$0.083/sec. Best for close-ups with facial hair. (3) lipsync-2 — fast, cost-efficient, solid quality, $0.04–$0.05/sec. Best for general purpose. (4) lipsync-1.9.0-beta — legacy fastest, $0.02–$0.025/sec. Best for simple videos on budget. (5) react-1 — expressive emotions + head movements, max 15s, $0.133–$0.167/sec. Requires paid sub.

Is there a free tier and what are the limits?

Yes, Free tier: 3 generations/month, 20 seconds max for lipsync models / 15 seconds max for sync-3, 1 concurrent job, watermark on all outputs, API access to all models. No credit card required. Good for testing but not production use.

How does the billing work — subscription vs usage?

Two separate charges: (1) Monthly subscription fee ($5/$19/$49/$249) charged on billing date — unlocks features, duration limits, concurrency, voice clones, discounts. (2) Usage fees billed separately whenever accumulated generation costs hit your tier's invoice threshold ($6 Hobbyist, $20 Creator, $50 Growth, $250 Scale) — per second of output at model's rate. You can hit usage threshold multiple times per month. No credits, no prepay.

What SDKs and integrations are available?

Official SDKs: Python (pip install syncsdk) and TypeScript (npm i @sync.so/sdk). Both provide typed methods for generate, status, estimate, batch, assets, models. REST API at api.sync.so with OpenAPI 3.1 spec at sync.so/openapi.json. Studio web playground at sync.so/studio. Bring-your-own TTS API key supported on Creator+ plans.

What are the video duration limits by plan?

Free: 20s (lipsync) / 15s (sync-3). Hobbyist: 1 minute. Creator: 5 minutes. Growth: 10 minutes. Scale: 30 minutes. Enterprise: custom. Per-generation caps; no monthly generation caps on paid plans (only usage invoice thresholds).

Does Sync Labs support voice cloning and custom voices?

Yes. Voice cloning: Free 0, Hobbyist 3, Creator 5, Growth 15, Scale 50, Enterprise custom. Bring-your-own TTS API key supported on Creator+. Active speaker detection on Creator+. react-1 model for expressive emotions/head movements (max 15s, requires paid sub).

How does Sync Labs compare to HeyGen, Synthesia, and Runway?

Sync Labs is a specialized lip-sync API for developers — raw model access, pay-per-second, multiple models. HeyGen/Synthesia are full avatar video platforms with templates, SCORM/LMS integrations, per-video pricing. Runway Gen-3 is general video generation (camera control, Act-One). Pick Sync Labs for programmatic lip-sync integration; pick HeyGen/Synthesia for template-based avatar videos; pick Runway for creative video generation.

Top Alternatives

• Vidu: Pick Sync Labs for programmatic lip-sync API + multiple models + pay-per-second; pick Vidu for end-user video generation with reference-to-video consistency and native audio co-generation.
• HeyGen: Pick Sync Labs for developer API + pay-per-second + multiple models; pick HeyGen for avatar-based video generation with template workflows and per-video pricing.
• Synthesia: Pick Sync Labs for raw lip-sync API + model choice + pay-per-second; pick Synthesia for full avatar video platform with templates, SCORM export, LMS integrations.
• Runway Gen-3: Pick Sync Labs for specialized lip-sync API with model choice; pick Runway Gen-3 for general video generation with camera control, act-one, and broader creative tools.

Visit Sync Labs Official Website