⚡ Quick Verdict:
- 価格: シンセシア starts at $18/month. Captions AI pricing starts lower at $9.99/month.
- 最適な用途: Synthesia suits training videos and explainer videos with AI avatars. Captions AI fits short form videos for social media.
- 主な違い： Synthesia gives you 150+ realistic AI avatars and 120+ languages. Captions AI prioritizes speed and a mobile-first video editor.
- Our pick: Synthesia for most users who need professional videos at scale. Its avatar quality and language reach win this Synthesia vs Captions AI matchup.
Both tools promise to turn plain text into finished video.
But Synthesia and Captions AI solve different problems.
One is built around realistic AI avatars and 120+ languages.
The other is built for fast, short form videos on your phone.
This guide breaks down the key differences between Synthesia vs Captions AI.
By the end, you will know the right AI ビデオジェネレーター あなたのために。
概要
これ シンセシス vs Captions AI comparison covers pricing, features, and ease of use.
It also explains who each AIビデオ generator works best for.
Our writers signed up for both tools and spent hands-on time with each.
Those notes appear in the “What Our Team Noticed” sections below.
We also checked published specs, documentation, and G2 reviews for both video 発電機.
Synthesiaとは何ですか?
Synthesia is an AI video generator that turns scripts into video.
It uses realistic AI avatars to present your words on screen.
You type text, pick an avatar, and the platform builds the video.
The whole video creation process takes just a few clicks.
Teams use it for training videos, explainer videos, and marketing videos.
It supports more than 120 languages, so you can reach a global audience.
シンセシア
Create professional videos with AI avatars in 120+ languages. Start your free trial and see how fast the video creation process can be.
シンセシアの価格
Here is what Synthesia costs in 2026. Let’s break it down.
| プラン | 価格 | 最適な用途 |
|---|---|---|
| スターター | 月額18ドル | Solo creators making professional videos |
| クリエイター | 月額64ドル | Frequent users needing more minutes of videos a year |
| 企業 | カスタム価格設定 | Large teams with custom avatar needs |
Pricing verified June 2026.
無料トライアル: Synthesia offers a free demo so you can test features before paying. No long commitment is needed to try it.
返金保証: Refund terms depend on your plan. Check the billing page before you subscribe.
📌 注記： Some third-party guides list Synthesia’s entry plan near $22/month. The current Starter price in our データ is $18/month, so we use that figure throughout.
⚠️ 警告： Plans are billed per seat and cap how many minutes of videos a year you can make. Heavy users should price the Creator plan carefully.
Synthesiaの主な利点
Here is what makes Synthesia worth considering:
- リアルなAIアバター: The platform provides over 150 diverse stock AI avatars. Its standard library includes 140 diverse AI avatars before any add-ons.
- 120以上の言語に対応： Synthesia supports over 120 languages for video creation. You can also do 1-click translation of finished videos.
- カスタムアバター： You can create a custom avatar that looks and sounds like a real presenter. This helps brands keep a consistent face on screen.
- AI Voices & テキスト読み上げ: Built-in AI voices read your script aloud. The text to speech engine sounds natural in many languages.
- ビデオテンプレート: A large set of video templates speeds up the video creation process. You start from a layout instead of a blank screen.
- AIビデオエディター: The built-in video editor lets you tweak scenes, add stock footage, and drop in video clips. It feels like a slide editor for video.
What Our Team Noticed
私たちの 作家 signed up for Synthesia and built a short training video. Here is what stood out from that hands-on time:
Synthesiaの長所と短所
✅ メリット
- Over 150 realistic AI avatars and a wide template library
- Supports more than 120 languages with 1-click translation
- Lets you create a custom avatar for consistent branding
- Free demo makes it easy to test before you buy
❌ デメリット
- Entry plan caps how many minutes of videos a year you get
- Costs more than Captions AI at the starting tier
- Less suited to fast, vertical short form videos
Captions AIとは何ですか？
Captions AI is a mobile-first AI video generator and video editor.
It helps creators make social media videos fast.
Captions AI prioritizes speed and simplicity over deep avatar libraries.
You can record, edit, and caption short form videos in one app.
It is more beginner-friendly than Synthesia for first-time users.
That makes it a good fit for creators building video content for TikTok and Reels.
キャプションAI
Edit short form videos and add auto-captions in minutes. Try Captions AI for free and get a free experience the magic of fast video creation.
キャプションAIの価格
Here is what Captions AI pricing looks like in 2026. Let’s break it down.
| プラン | 価格 | 最適な用途 |
|---|---|---|
| プロ | 月額9.99ドル | Solo creators making social media videos |
| マックス | 月額24.99ドル | Active creators who post often |
| 規模 | 月額69.99ドル | Teams producing high volumes of video content |
Pricing verified June 2026.
無料トライアル: You can sign up for free and test the app before paying. This lets you try Captions AI for free on a real project.
返金保証: App store rules handle most refunds. Cancel inside your account settings to stop renewal.
📌 注記： Some external lists quote a $19/month starting price for Captions AI. Our current data shows the Pro plan at $9.99/month, so we use that figure here.
⚠️ 警告： Some advanced AI features sit behind the higher tiers. Check that the plan you pick allows Captions AI for commercial use.
字幕AIの主な利点
Here is what makes Captions AI worth considering:
- スピードとシンプルさ: Captions AI prioritizes speed and simplicity. You can generate videos with very little setup.
- 直感的なインターフェース: The intuitive interface is easy for beginners. There is almost no learning curve to create videos.
- AIツインズ： You can build an AI twin that speaks in your own voice. This lets you make videos with AI avatars of yourself.
- 自動字幕: The app adds captions automatically to your video clips. This is handy for short form videos that play on mute.
- Text Based Video Editing: You edit by changing the words, not the timeline. This text based video editing trims footage as you cut text.
- AIアイコンタクト： The AI fixes your gaze so you look at the camera. It also removes background noise from any audio file you upload.
What Our Team Noticed
Our writer used Captions AI to cut a short clip for social media. Here is what stood out from that hands-on time:
字幕AIのメリットとデメリット
✅ メリット
- Very fast and beginner-friendly for social media videos
- Cheaper entry plan than Synthesia at $9.99/month
- Auto-captions and AI eye contact built in
- Text based video editing speeds up rough cuts
❌ デメリット
- Fewer stock AI avatars than Synthesia
- Weaker for long training videos and explainer videos
- Supports fewer languages for video creation
機能比較
Ready to dive into a detailed vs Captions AI feature breakdown? We will explore nine key features to help you pick the right AI video generator. This Captions AI feature comparison covers avatars, 声, languages, and editing.
| 特徴 | シンセシア | キャプションAI |
|---|---|---|
| 開始価格 | 月額18ドル | 月額9.99ドル |
| 無料プラン／トライアル | Free demo | 無料プラン |
| Realistic AI Avatars | ✅ 150以上 | ✅ 限定 |
| カスタムアバター | ✅ | ✅ AIツインズ |
| 複数の言語 | ✅ 120以上 | ❌ Fewer |
| ビデオテンプレート | ✅ Wide library | ✅ 基本 |
| Text Based Video Editing | ❌ | ✅ |
| Short Form Videos | ✅ | ✅ Best in class |
| 最適な用途 | Training & explainer videos | ソーシャルメディア動画 |
Here is a closer look at how Synthesia presents these features in practice.
1. Realistic AI Avatars
シンセシア： You get over 150 diverse stock AI avatars, including a standard set of 140 diverse AI avatars. These realistic AI avatars present your script like a human host. You can also build a custom avatar from real footage.
キャプションAI: そのAI アバタージェネレーター focuses on AI twins of real creators. The avatar pool is smaller than Synthesia’s. Still, it covers most needs for short social clips.
2. AI音声とテキスト読み上げ
シンセシア： Built-in AI voices handle text to speech across many languages. The voices sound natural for training videos and marketing videos. You type a script and the avatar speaks it.
キャプションAI: The AI Twins feature can clone your own voice. You can also upload an audio file or use voice recordings. This keeps your videos sounding like you.
3. Multiple Languages and Translation
シンセシア： This is a clear strength. It supports more than 120 languages for video creation. The 1-click translation feature lets you turn one video into many.
キャプションAI: Its AI Creators tools support fewer languages. The focus is English-first social content. For global training videos, Synthesia is the stronger video generator.
⚠️ 警告： Language support changes often. Confirm your target language is available before you commit to either video generator.
4. Video Editor and Text Based Editing
シンセシア： The video editor works like a slide ビルダー. You arrange scenes, add video clips, and drop in stock footage. It is built for structured, professional looking videos.
キャプションAI: It offers text based video editing. You cut footage by editing the transcript instead of a timeline. This speeds up creating videos for social feeds.
5. Video Templates and Stock Footage
シンセシア： It offers a wider variety of video templates than Captions AI. Built-in stock footage helps you fill scenes fast. Templates make creating videos less work for beginners.
キャプションAI: Templates here are lighter and tuned for vertical clips. You customize video content with quick presets. It is enough for most social media videos.
6. AI Script Writer and Assistant
シンセシア： AIビデオ アシスタント acts as an AI script writer. It can draft a script and turn it into AI generated videos. This helps when you stare at a blank page.
キャプションAI: Its AI Creators tools include an AI script assistant for short hooks. You get ideas tuned for social media in just a few clicks. It is built for fast, punchy content.
7. Short Form and Social Media Videos
シンセシア： It can make short form videos, but it shines on longer formats. Interactive videos and quizzes suit training. It is less native to vertical social clips.
キャプションAI: This is its home turf. Auto-captions and vertical formats make creating social media videos simple. It is the better tool for daily short form videos.
8. Collaboration and Polish
シンセシア： Teams can share and review projects together. This helps brands produce high quality videos at scale. It fits marketing teams making many marketing videos.
キャプションAI: AI Eye Contact fixes your gaze so you look at the camera. Small touches like this raise polish on solo recordings. It helps creators look pro without a studio.
9. Screen Recording and Audio Tools
シンセシア： A built-in AI screen recorder helps you make how-to and explainer videos. Pair it with avatars to narrate steps. This is useful for software walkthroughs.
キャプションAI: Its background noise remover cleans up any audio file. This matters when you record on a phone outdoors. Clean audio makes your video content easier to watch.
Captions AI keeps its own standout features front and center, as the visual below shows.
10. 価格設定とコスト
Let’s compare the pricing plans side by side. This vs Captions AI pricing view sets the two AI video generators next to each other.
| プラン | シンセシア | キャプションAI |
|---|---|---|
| エントリ | Starter — $18/month | Pro — $9.99/month |
| 中 | Creator — $64/month | Max — $24.99/month |
| トップ | Enterprise — Custom | Scale — $69.99/month |
シンセシア： You pay more up front, but you get 120+ languages and 150+ avatars. For teams making professional videos at scale, the value adds up. Pricing for AI video generators in this class runs higher than basic editors.
キャプションAI: The $9.99 Pro plan undercuts Synthesia’s entry tier. That makes it a low-risk way to start creating social media videos. Captions AI pricing rewards solo creators on a budget.
さまざまなシナリオ
| 必要な場合は | 選ぶ | なぜ |
|---|---|---|
| 予算が限られている | キャプションAI | Cheaper $9.99 entry plan |
| リアルなAIアバター | シンセシア | 150+ stock avatars |
| 複数の言語 | シンセシア | 120+ language support |
| Short form videos | キャプションAI | Built for social clips |
| トレーニングビデオ | シンセシア | Templates and avatars |
| 初心者向け | キャプションAI | 最もシンプルなインターフェース |
💰 あなたの予算
Captions AI pricing starts lower, so it suits a tight budget. Synthesia costs more but packs in more avatars and languages.
🔌 あなたの技術スタック
Synthesia works best on desktop for structured projects. Captions AI is mobile-first and ready for on-the-go video creation.
📝 コンテンツの種類
Pick Synthesia for training videos, explainer videos, and marketing videos. Pick Captions AI for fast social media videos and short form videos.
🎓 あなたの経験レベル
Captions AI has a user friendly interface for total beginners. Synthesia has a slightly steeper but still simple learning curve.
🆓 無料トライアルとデモ
Synthesia offers a free demo to test features. Captions AI lets you sign up for free and try Captions AI for free first.
🛟 サポートオプション
Both video generators offer tutorials and help docs. Synthesia adds more team and enterprise support for larger groups.
切り替えガイド
既にこれらのツールのいずれかをご利用ですか？切り替える場合、どのような変更が想定されますか？
🔄 SynthesiaからCaptions AIに切り替えますか？
✅ 得られるもの：
- Faster workflow for short form videos
- A cheaper entry plan at $9.99/month
- Text based video editing and auto-captions
❌ 失うもの：
- 150+ realistic AI avatars
- Support for 120+ languages
- The wide video templates library
📋切り替え方法：
- Export your finished videos from Synthesia
- Sign up for free with Captions AI
- Rebuild your short clips in the new editor
🔄 Captions AIからSynthesiaに切り替えますか？
✅ 得られるもの：
- Access to 150+ realistic AI avatars
- 120+ languages and 1-click translation
- Stronger tools for training and explainer videos
❌ 失うもの：
- The fastest path to short form videos
- The $9.99 entry price
- Mobile-first text based video editing
📋切り替え方法：
- Save your scripts and clips from Captions AI
- Start your free trial of Synthesia
- Rebuild your videos using avatars and templates
What Our Review Didn’t Cover
This comparison focused on solo creators and small teams. We did not test enterprise rollouts, deep API access, or bulk seat pricing. Our notes reflect the June 2026 versions of both video generators. If you run a large team or need custom integrations, your priorities may differ from what we covered here.
最終評決
| カテゴリ | 勝者 |
|---|---|
| 💰価格 | キャプションAI |
| 🤖 AIアバター | シンセシア |
| 🌍 言語 | シンセシア |
| ⚡ Speed for Social | キャプションAI |
| 🎯 Templates & Quality | シンセシア |
| 👶 使いやすさ | キャプションAI |
| 🏆総合優勝 | シンセシア |
🏆 優勝：シンセシア
Synthesia wins 3 of 6 head-to-head categories, including avatars and languages.
最適な用途: Training videos, explainer videos, and global marketing videos.
Synthesia and Captions AI are two different products. They share the AI video label but aim at different users.
Synthesia is the better choice for professional videos with realistic AI avatars. It helps you create amazing videos in 120+ languages from a simple script.
Captions AI is excellent for fast social media videos. If you mostly post short form videos from your phone, it is the easier pick.
For most teams that need high quality video at scale, Synthesia is the right AI video generator. Start your free trial today and see which one fits your workflow.
Synthesiaの比較
Here is how Synthesia stacks up against other AI video generators. One quick note: people sometimes search for Synthesys vs Captions AI by mistake. Synthesys is a separate AI voice tool, while this guide covers Synthesia vs Captions AI.
Synthesia vs ヘイジェン
Synthesiaが優れている点： larger avatar library, broader language reach, deeper template set
HeyGenが勝利した点： custom avatars from your own voice, faster avatar lip-sync, simpler entry flow
Synthesia vs コロサイ
Synthesiaが優れている点： more stock avatars, wider language support, stronger brand presence
コロシアンの勝利： built-in scenario templates for L&D, conversation-style scenes, focused training features
Synthesiaが優れている点： avatar realism, 120+ language video creation, polished video templates
Synthesysが勝利した点： dedicated AI voices, text-to-speech depth, talking-photo effects
字幕AIの比較
Here is how Captions AI stacks up against other tools. Across the app you will spot the Captions AI logo on a clean, intuitive interface. Here is a short vs Captions AI overview against three rivals.
字幕AIが勝利した項目： faster mobile editing, auto-captions for short form videos, lower entry price
HeyGenが勝利した点： bigger avatar catalog, more languages, stronger long-form output
字幕AI対 ヴィード
字幕AIが勝利した項目： AI eye contact, AI twins, hands-off captioning
Veedが勝利した理由： richer timeline editor, more export options, browser-based teamwork
字幕AI対 フリキ
字幕AIが勝利した項目： live recording polish, gaze correction, mobile speed
フリキが勝利： text-to-video from blog posts, broad voice library, more language options
In short, this AI prioritizes speed simplicity over deep features. It is built to help you create stunning AI videos and create engaging videos for social feeds. Sign up and experience AI video creation firsthand. Higher plans also unlock more minutes of videos year over year. Whether you choose Synthesia or Captions AI, both let you start at no cost.
よくある質問
字幕表示はAIによって行われているのですか？
Yes. Many tools now use artificial intelligence to add captions automatically. Captions AI generates auto-captions for your video clips with little manual work.
What is AI subtitles?
AI subtitles are text overlays an app creates from your audio file. The AI transcribes speech, then times each line to match the video automatically.
AI字幕はどのように使用すればよいですか？
Upload or record your clip, then turn on auto-captions. The tool adds subtitles in just a few clicks. You can edit wording or style before export.
AIによる字幕の精度はどの程度ですか？
AI captions are usually 90% or more accurate with clear audio. Background noise lowers accuracy, so a noise remover helps. Always review captions before posting.
AIは画像にキャプションを生成できますか？
Yes. Image captioning models describe what they see in a photo. This differs from video subtitles, which turn spoken audio into on-screen text.
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