Inworld AI vs Smallest AI (2026): which should you pick?
As of Nov 12, 2026, Inworld AI grades higher than Smallest AI: 2.0 against 1.8 out of 4.0.
Checked Nov 12, 2026 · graded Nov 12, 2026 by ToolGPA
Inworld AI grades higher on features. They get the same grade on value for money, the free plan, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Inworld AI
Text-to-speech, speech-to-text and LLM API with monthly credit plans
Smallest AI
Voice AI models and agents: text to speech, speech to text, calls
Which one is for you
Pick Inworld AI if
- Fits if you are building a real-time voice agent or companion
- Works for game or app teams that need many custom voices
Look elsewhere if
- Not for you if you want to paste a script and download, because this is an API product
- Watch out: the 70 free minutes aren't described as monthly, so don't count on them renewing
- Watch out: zero data retention starts at Developer ($300), and HIPAA and BAA are Growth add-ons
- Pricey if you go over the credit: overage bills at the plan's own rates, and extra credits expire after a year
Pick Smallest AI if
- Fits if you prototype voice agents and want to pay by use
- Makes sense if you want speech and speech to text from one vendor
Look elsewhere if
- Not for you if you want a flat monthly price, since there is none
- Tight if you test past the $10 credit, which is one-time
- Watch out: agents cost roughly $0.09 to $0.21 a minute plus a $0.01 a minute hosting fee
- Watch out: HIPAA zero data retention is a $1,000 a month add-on, and SSO and SOC 2 support are Enterprise only
How we grade them
| 2.0GPAInworld AIFair | 1.8GPASmallest AIWeak | |
|---|---|---|
| Value for money | CCreator is $25 a month in credits, with TTS-2 at $20 per 1M characters, dropping to $12.50 at the $1,500 Growth tier. The cheapest plan is in the dearer half of the category. | CNo monthly fee. Lightning v3.1 is about $0.175 per 10,000 characters and Pulse $0.003 a minute, so the bill follows usage and there is no sticker price to rank. |
| Free plan and trial | COn-Demand is $0 pay as you go with up to 70 minutes of speech included. The page doesn't say it renews monthly, so treat it as a trial amount. | C$10 in free credits with full access, once. After that it is pay as you go, and whether a card is needed isn't stated. |
| Features | BTTS, speech to text and an LLM API, 100 to 30,000 custom voices by plan, professional clones from Creator. It covers the job for agents and games. | CSpeech, speech to text and hosted agents, with enterprise on-premise. The limits include 15 concurrent TTS streams and a 450M-character monthly cap. |
| Ease of use | DNo store rating on record. It is an API-first product that expects developers. | DNo store rating on record. It is a developer platform you call through an API. |
| Platforms and integrations | CWeb and an API. No integrations or apps are listed. | CWeb and an API, with OpenAI listed. No apps. |
| Best for | real-time voice for agents and companions | usage-billed voice models and agents |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Inworld AI and Smallest AI. How we grade
Where they differ
- Smallest AI also covers AI agents.
At a glance
| Inworld AI | Smallest AI | |
|---|---|---|
| Pricing | Free plan | Free trial |
| Starts at | $25 per month, billed monthly | Not published |
| Free plan | On-Demand: $0 pay as you go with up to 70 minutes of text to speech included; 100 custom voices, commercial license. | None |
| Free trial | None listed | $10 in free credits with full access when you sign up for pay as you go. |
| Web | ||
| Made by | Inworld AI | Smallest AI |
| Price read from | inworld.ai | smallest.ai |
| Checked | Nov 12, 2026 | Nov 12, 2026 |
Worth knowing
Inworld AI
- Overage is billed at the plan's own rates, and extra credits expire one year after purchase.
- The 70 free minutes on On-Demand are not described as monthly, so treat them as a trial amount.
- Zero data retention starts at Developer, and HIPAA and BAA are Growth add-ons.
- The page showed monthly prices; a Yearly toggle advertises 2 months free, so the annual amounts were not read.
Smallest AI
- Pay as you go has no monthly fee: about $0.175 per 10,000 characters for Lightning v3.1 ($0.195 for Pro) and $0.003 a minute for Pulse.
- Voice agents cost roughly $0.09 to $0.21 a minute depending on the models chosen, plus a $0.01 a minute hosting fee.
- Pay-as-you-go limits include 15 concurrent TTS streams, 100 TTS requests per minute and a 450M characters monthly cap.
- HIPAA zero data retention is a $1,000 a month add-on, and SOC 2 compliance support and SSO are Enterprise only.
Key features
Inworld AI
- Realtime TTS-2 and TTS-2 Flash
- Two text-to-speech models priced per million characters, with steering on TTS-2, speaking rate and temperature controls, and 200+ languages.
- Voice cloning and design
- Instant cloning and voice design are on every plan; professional voice clones are capped by tier, from 2 to 40 and 100+ on Enterprise.
- Speech to text and speech to speech
- Real-time STT from $0.15 an hour on On-Demand and low-latency speech-to-speech conversations on the same credits.
- LLM inference
- Hosted open and third-party models are billed per token from the same credit balance, from $0.07 per 1M input tokens.
- Credits that roll over
- Unused subscription credits carry over for up to 3 months while a paid plan of equal or higher value stays active.
Smallest AI
- Lightning text to speech
- The Lightning v3.1 model lists sub-100 ms time to first audio, automatic switching between 14+ languages and 44.1 kHz output.
- Voice cloning
- The model page says a voice can be cloned from 5 seconds of audio; the pay-as-you-go comparison table lists voice cloning as not included and custom on Enterprise.
- Pulse speech to text
- Batch and real-time transcription with speaker identification, timestamps and sensitive-data protection, listed at a 5.42% word error rate.
- Hydra speech to speech
- A full-duplex speech-to-speech model that is in beta and available on request.
- Voice agents
- Build agents that run calls and campaigns, with a web widget, phone numbers at $10 a month and post-call analytics.
Plans
Inworld AI
On-Demand$0
Pay as you go: TTS-2 $25 per 1M characters, TTS-2 Flash $15. Up to 70 min of TTS included.
Creator$25
per month, billed monthly
$25 in credits a month. TTS-2 $20 per 1M characters, Flash $10. 500 custom voices, 4 professional clones.
Builder$100
per month, billed monthly
$100 in credits. TTS-2 $17.50 per 1M characters, Flash $9. 3,000 custom voices, higher concurrency.
Developer$300
per month, billed monthly
$300 in credits. TTS-2 $15 per 1M characters, Flash $8. 10,000 custom voices, zero data retention.
Growth$1,500
per month, billed monthly
$1,500 in credits. TTS-2 $12.50 per 1M characters, Flash $7. 30,000 voices, HIPAA and BAA as add-ons.
EnterpriseCustom
Custom limits and terms, SLA, DPA, EU and India data residency; TTS-2 from as low as $5 per 1M.
Smallest AI
EnterpriseCustom
Dedicated infrastructure, a 99.99% uptime SLA, forward deployed engineers, SSO, SOC 2 support, on-premise deployment and custom concurrency. Sold through sales.
Ways to pay less
Inworld AI
- Annual discount
2 months free on yearly billing
Inworld's pricing page has a Yearly toggle labeled as giving 2 months free compared with monthly billing.
Smallest AI
No public discounts listed.
Common questions
Which is cheaper, Inworld AI or Smallest AI?
As of Nov 12, 2026, Inworld AI starts at $25 per month, billed monthly, and Smallest AI publishes no starting price.
Which has a free plan, Inworld AI or Smallest AI?
As of Nov 12, 2026, only Inworld AI has a free plan. Smallest AI does not, though it has a free trial.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.