どちらを使うべきか？
you want to design one new AI character step by step, lock its face in a reference sheet, and make photos, image-to-video, talking clips and video swaps of that same character in one workspace, rather than a presenter reading a script
you want presenter-style videos from a script: HeyGen for an avatar of yourself, voice cloning and translation into many languages on a free plan, Synthesia for business videos with stock or personal avatars, team guests and a free Basic plan
各プラットフォームが強い点
HeyGen (heygen.com) and Synthesia (synthesia.io) are both AI video platforms where an avatar presents a script, and both offer stock avatars, an avatar of yourself, voice and translation or dubbing. HeyGen leans toward creators and marketers, with a free plan, a Video Agent and video translation with lip sync. Synthesia leans toward business training and communication, with a free Basic plan, a shared pool of monthly credits and team guests on paid plans. In the table, each HeyGen or Synthesia cell lists both products so you can read the head-to-head directly; the RYLA column shows a third option. Facts come from the public HeyGen pricing page and the Synthesia pricing page, read on 9 November 2026. RYLA plans come from the RYLA pricing page. The table includes the rows where HeyGen or Synthesia is ahead.
| Feature | RYLAおすすめ | HeyGen or Synthesia |
|---|---|---|
| Primary job |  Design one recurring AI character and generate its photos, video, and talking clips. | HeyGen: talking videos of you or a stock avatar, video translation and a prompt-based Video Agent. Synthesia: presenter-style business videos with stock or personal avatars and dubbing. |
| Free plan | Paid plans; current plans and credits are on the pricing page. | HeyGen: Free, 3 videos a month up to 1 minute each. Synthesia: Basic, $0 with 500 credits a month (about 10 minutes of video) and the Synthesia logo on videos. |
| Entry paid plan | Basic: $34.99 a month, 10,000 credits a month. | HeyGen: Creator at $29 a month. Synthesia: Starter at $19 a month ($9 for the first month), 1,250 credits a month. |
| Higher plans | Agency: $199.99 a month, up to 15 influencers. | HeyGen: Pro from $49 a month, Business at $149 a month plus $20 per extra seat a month. Synthesia: Pro at $89 a month (6,000 credits). Both list a custom Enterprise plan. |
| Avatar of yourself |  The builder designs a new character; making an avatar of yourself from a recording is not part of it. | HeyGen: custom avatars on every plan (1 on Free, 5+ on Business), plus voice cloning. Synthesia: personal avatars from Starter (3 on Starter, 5 on Pro), none on Basic. |
| Stock avatars | Not a stock presenter library; every character is one you design. | HeyGen: 500+ ready-made presenters listed on the Free plan. Synthesia: 9 AI avatars on Basic, 125+ on Starter, 180+ on Pro. |
| Languages | Talking clips use the voice chosen in the builder; no translation feature. | HeyGen: translation in 30+ languages on Free and 175+ languages and dialects on paid plans. Synthesia: 140+ languages and voices, dubbing output in 70+ languages on Basic, Starter and Pro. |
| Teams | Not compared here; current plan features are on the pricing page. | HeyGen: seats on Business at $20 per extra seat a month. Synthesia: 1 editor with 3 guests on Starter and 5 guests on Pro. |
| One designed character across photos and video | After the builder you pick a base image, and RYLA generates a reference sheet of that face; Studio photos, image-to-video, and talking clips are made from it. | Both are video-first presenter tools; photo generation of one recurring designed character is not described on their pricing pages. |
RYLA の列は、主張するのではなく実際に見せています。価格やポリシーに関する主張の行には、あえて画像を置いていません。
同じ顔、4つの異なるシーン
ここにある画像はすべて RYLA で生成しました。ひとりのキャラクターを4つの異なるシーンに置き、その間に修正は加えていません。
RYLA が勝つ点
HeyGenを一言で
自分または既成アバターの動画を作るAI動画プラットフォーム。音声クローン、有料プランで175以上の言語への翻訳、Video Agent、無料プランがあり、席を除いて月29ドルから149ドルです。
Synthesiaを一言で
企業向け動画のためのAI動画プラットフォーム。有料プランで125体以上から180体以上の既成アバター、個人アバター、吹き替え、チームゲスト、無料のBasicプランがあり、月19ドルから89ドルです。
RYLAの違い
RYLAは台本ではなくキャラクターから始まります。ビルダーで顔を設計するとRYLAがそのリファレンスシートを生成し、以降のすべての写真、クリップ、話す動画はその1人のキャラクターから作られます。
差があることも正直に
プレゼンター動画、翻訳、自分自身のアバター、チーム機能、無料プランではHeyGenとSynthesiaが先行しています。RYLAにはこれらがなく、料金も両社の最初のプランより高くなります。
HeyGen or Synthesia がまだ勝る点
For presenter-style video, HeyGen and Synthesia are ahead of RYLA, and between the two the choice depends on the job. HeyGen is the more creator-oriented one: a free plan, a custom avatar on every plan, voice cloning and translation into 175+ languages on paid plans. Synthesia is the more business-oriented one: a lower entry price ($19 against $29 a month), dubbing and guest seats for reviewers. RYLA does not offer an avatar of you, voice cloning, translation, a stock presenter library or a free plan. If you need a training video, a sales message or a localized explainer, one of those two is built for it and RYLA is not.
HeyGen or Synthesia から RYLA へ乗り換える
Nothing imports from HeyGen or Synthesia into RYLA, so adding a recurring character means building it once. This is the actual sequence in the RYLA builder:
- Pick a niche, then gender and style.
- Set the look: ethnicity, age, skin, eyes, face shape, and hair.
- Choose outfit and scene, then personality and a name, then a voice.
- Generate base images and pick the one that becomes your character.
- RYLA generates a reference sheet of that face.
- Finalize, then create new photos in Studio, motion with image-to-video, talking clips in Avatar Video, and swaps in Video Swap.
Here is one RYLA character from the showcase on this site, generated in two different scenes:
Current plans are on the pricing page. For one-on-one comparisons, see the HeyGen alternative and Synthesia alternative pages, or the talking avatar page.
判定
Choose HeyGen if you want a talking video of yourself or a stock avatar, voice cloning, translation into many languages and a free plan. Choose Synthesia if you want business videos with stock or personal avatars, dubbing, guest seats for reviewers and a free Basic plan at a lower entry price. Choose RYLA if you would rather design one character in a guided builder, lock its face in a reference sheet, and make its photos, clips, talking videos and swaps in one place. RYLA is not affiliated with, endorsed by, or connected to HeyGen or Synthesia; their names are used on this page only to identify those services.