Synthflow alternative
Crackle vs Synthflow.
Synthflow sells enterprise contracts from $30,000 a year, planned with you around call volume, telephony, integrations and launch support, and shows SOC 2, HIPAA, ISO 27001 and GDPR. Crackle is self-serve: start free today and pay by the minute. Choose Synthflow for a contact-centre rollout with a vendor beside you; choose Crackle to build and launch an agent yourself, in your website or app.
Synthflow’s facts are from its own pages, checked on 14 October 2026. Prices change; the sources are at the foot of the table.
Side by side.
| What | Crackle | Synthflow |
|---|---|---|
| Price | $0.07 a minute | Enterprise contracts from $30,000 a year |
| What the price covers | Voice, transcription and model, whichever you choose | Set per contract: volume, concurrency, telephony and integrations |
| To start | Free plan with sign-up credit; plans from $29 a month include call credit | Through their sales team |
| Calls at once | 2 on the free plan; 5, 20, 75 on paid plans | Planned per contract |
| Billed by | The second; a call nobody joins costs nothing | Per contract |
| Phone numbers | Not yet | Yes: their own telephony or SIP |
| Web and mobile apps | Web, iOS, Android and React Native, through LiveKit | Not stated on their pricing page |
| Talk button for a website | Yes: one line of HTML | Not stated on their pricing page |
| Languages | 44, with voices recorded in Hindi, Hinglish, Tamil, Telugu, Kannada, Marathi, Bengali, Gujarati and Punjabi | Not stated on their pricing page |
| Answers from documents | Yes: PDF, Word and text, up to 500 documents | Knowledge-source integrations |
| Calls your APIs | Yes: your HTTP endpoints, during a call or before it | Webhooks, an API, and CRM and calendar integrations such as HubSpot, Salesforce, Cal.com and Zapier |
| How an agent is built | A studio: write instructions, pick a voice, press Test agent; or the API | Built and launched with their team: onboarding, testing and training |
Sources: Synthflow pricing, read on 14 October 2026. Crackle’s figures are from its live price list.
When Synthflow is the better choice.
- You run a contact centre and want a vendor to plan, build and launch with you.
- You need SOC 2, HIPAA and ISO 27001, with EU or US hosting.
- You want ready integrations with HubSpot, Salesforce or GoHighLevel.
When Crackle is the better choice.
- You want to start today, by yourself, for free, and pay only for the minutes you use.
- Your callers speak Hindi, Hinglish or another Indian language and you want a voice recorded in it.
- Your agent lives in your website or app.
Moving from Synthflow.
Most of an agent carries straight across. Their names for things, and Crackle’s.
- Agent
- Agent
- System prompt
- Instructions: paste it in and keep it as it is
- Integrations and actions
- Tools: HTTP endpoints, such as your CRM’s API or a Zapier webhook
- Knowledge base files
- Knowledge: upload the same PDFs, Word and text files
- Call events to your server
- Webhooks, signed, for each call’s start, lines and end
Other comparisons.
Try Crackle on your own agent.
Paste in the instructions you already have, pick a voice and talk to it. Sign-up credit is there for your first test calls.