Retell AI vs Tone

Retell AI9.4Visit Tone9.3Visit

Higher score Retell AI #1 in AI Voice Agents 9.4/10 Paid ✓ 4 of 4 features Visit Retell AI

vs

Tone #2 in AI Voice Agents 9.3/10 Free plan Free plan✓ 4 of 4 features Visit Tone

• Retell AI fits best

  Teams needing practical phone automation quickly

• Tone fits best

  Teams wanting a complete open-source voice platform

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Side by side

Feature	Retell AI 9.4/10 Visit ↗	Tone 9.3/10 Visit ↗
At a glance
Editor score	9.4	9.3
Ranking	#1 in AI Voice Agents	#2 in AI Voice Agents
Best for	Teams needing practical phone automation quickly	Teams wanting a complete open-source voice platform
Pricing model	Paid	Free plan + paid
Starting price	$0.07 usage-based	$0.09 usage-based
Free plan	—	✓ (best)
Free trial	—	—
Deployment	Cloud	Cloud, Self-hosted
Platforms	Web	Web
Integrations	12 integrations	20 integrations
Features Retell AI 4/4 · Tone 4/4
Inbound calls	✓	✓
Outbound calls	✓	✓
Human handoff	✓	✓
Custom phone numbers	✓	✓
Specs
Supported languages	55 languages (best)	29 languages
Concurrent calls	20 calls	Not checked yet
Our review
Pros	Handles inbound calls, outbound campaigns, IVR, and DTMF navigation Transfers callers with transcript context and supports knowledge-base responses Includes analytics, transcripts, simulation testing, and CRM integrations	Self-hosting includes unlimited agents, calls, workflows, and integrations. Visual workflows support conditional branches and human handoff. Testing, call observability, and knowledge citations are built in.
Cons	Usage-based pricing can vary by model, voice, telephony, and add-ons Enterprise features such as SSO and role-based access require custom pricing The platform is focused on business phone operations rather than general voice use	Self-hosting requires teams to bring their own LLM, voice, and telephony. Cloud usage is billed per minute rather than through a fixed plan. Enterprise pricing is not specified in the published plan details.
Our verdict	Retell AI is a platform for building, testing, deploying, and monitoring AI voice agents for business phone operations. It supports inbound call answering, outbound batch calling, appointment booking, record updates, IVR navigation, DTMF… Read the review →	Tone is an open-source platform for teams building phone and other conversational agents. It supports inbound and outbound calls, web widgets, chat, and SMS, with a runtime, workflow builder, knowledge base, testing tools, and… Read the review →

Strengths and trade-offs

• Retell AI — where it wins

  • Handles inbound calls, outbound campaigns, IVR, and DTMF navigation
  • Transfers callers with transcript context and supports knowledge-base responses
  • Includes analytics, transcripts, simulation testing, and CRM integrations

  Where it doesn't

  • Usage-based pricing can vary by model, voice, telephony, and add-ons
  • Enterprise features such as SSO and role-based access require custom pricing
  • The platform is focused on business phone operations rather than general voice use

• Tone — where it wins

  • Self-hosting includes unlimited agents, calls, workflows, and integrations.
  • Visual workflows support conditional branches and human handoff.
  • Testing, call observability, and knowledge citations are built in.

  Where it doesn't

  • Self-hosting requires teams to bring their own LLM, voice, and telephony.
  • Cloud usage is billed per minute rather than through a fixed plan.
  • Enterprise pricing is not specified in the published plan details.

• Retell AI9.4/10 · Paid

  Practical inbound and outbound phone automation with transfers, testing, and analytics.

  Visit Retell AIFull verdict →
• Tone9.3/10 · Free plan

  A full voice-agent toolkit with free self-hosting and cloud usage priced per minute.

  Visit ToneFull verdict →