kitio.aiAmazon Polly vs SFX Engine
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Amazon Polly starts at See pricing page and SFX Engine starts at $10/mo. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Neural and generative voices
- SSML support
- Custom lexicons
- Speech marks
- Long-form voices
- Prompt-to-sound generation
- Four takes per prompt
- Searchable sound library
- Background music and stems
- Voiceover generation
- Developer API
| Feature | Amazon Polly | SFX Engine |
|---|---|---|
| Best for | AWS text-to-speech service for apps, IVR and content at scale | Text-to-sound-effect generator with royalty-free commercial use |
| Category | Audio & voice | Audio & voice |
| Pricing model | Freemium | Free trial |
| Starting price | See pricing page | $10/mo |
| Free plan | Yes | No, trial available |
| Made by | Amazon Web Services | SFX Engine |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Amazon Polly starts at See pricing page and SFX Engine starts at $10/mo. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
5 plans
Free tier
Free
- Millions of free characters per month
- For new AWS accounts
Standard voices
$4 / 1M characters
- Pay-as-you-go
Neural voices
$16 / 1M characters
- More natural speech
Generative voices
$30 / 1M characters
- Most humanlike voices
Long-form voices
$100 / 1M characters
- For long-form content
3 plans
Starter
$10/mo
- 500 credits per month
- About 166 sound effects
- Background music
- API access
Creator
$25/mo
- 4,000 credits per month
- About 1,333 sound effects
- Full API access
- Priority support
Pro
$90/mo
- 15,000 credits per month
- About 5,000 sound effects
- Priority feature requests
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Amazon Polly
- Reliable at very high volume
- Fits existing AWS setups
- Low price for standard voices
- Less expressive than newer startups
- Requires an AWS account and setup
SFX Engine
- Commercial use on every plan
- Several takes to choose from
- API access even on Starter
- Downloads need a paid plan
- Every take uses credits
- Effects capped at about 47 seconds
Which one should you choose?
Choose Amazon Polly if you want:
- Reliable at very high volume
- Fits existing AWS setups
- Low price for standard voices
Watch out: less expressive than newer startups.
Choose SFX Engine if you want:
- Commercial use on every plan
- Several takes to choose from
- API access even on Starter
Watch out: downloads need a paid plan.
Amazon Polly vs SFX Engine FAQ
What is the difference between Amazon Polly and SFX Engine?
Amazon Polly: AWS text-to-speech service for apps, IVR and content at scale. SFX Engine: Text-to-sound-effect generator with royalty-free commercial use. Both are audio & voice tools.
Is Amazon Polly or SFX Engine cheaper?
Amazon Polly starts at See pricing page and SFX Engine starts at $10/mo. Check both pricing pages for current plans.
Do Amazon Polly and SFX Engine have free plans?
Amazon Polly: Yes. SFX Engine: No, trial available.
Who makes Amazon Polly?
Amazon Polly is made by Amazon Web Services, based in United States.
Who makes SFX Engine?
SFX Engine is made by SFX Engine.
Which should I choose, Amazon Polly or SFX Engine?
Choose Amazon Polly if you value reliable at very high volume and fits existing aws setups. Choose SFX Engine if you value commercial use on every plan and several takes to choose from.