7 best Cresta alternatives in 2026, compared
Samuel Oram-Jones, 10 min read
The best Cresta alternatives in 2026 are Bland, Sierra, Decagon, PolyAI, ElevenLabs, Vapi, and Synthflow, and Bland ranks first for enterprise calls because it is full stack. Cresta sells agent assist, quality scoring, and AI agents on one platform, so this ranking covers only the AI agent that takes the call, as of November 2026.
What are the best Cresta alternatives?
The best Cresta alternative overall is Bland, because one company builds and runs every AI model on a call.
- Bland: Best overall for enterprise calls
- Sierra: Best for enterprise teams buying outcome-priced agents
- Decagon: Best for support teams adding voice to chat and email
- PolyAI: Best for enterprises that want a managed, quoted agent
- ElevenLabs: Best for teams already building on ElevenLabs voices
- Vapi: Best for developers assembling their own voice stack
- Synthflow: Best for sales-led, multi-channel voice teams
Why do teams look for Cresta alternatives?
Teams look for Cresta alternatives when the job is an AI agent that answers calls and a four-product platform is more than the project needs. Cresta says "Pricing is custom and based on deployment scope" and "There is no public self-serve tier", so a team cannot run last quarter's call minutes through a published rate before it talks to sales.
Cresta pairs autonomous AI agents with real-time agentic assist for human agents, so a team has to decide first whether it wants software that answers calls or software that coaches the people who do. Every alternative on this list is the first kind, and a team that still wants assist for its human agents will keep Cresta or another assist product beside whichever AI agent it picks.
Size is the second reason. Cresta describes its ideal customer as an enterprise with "250+ employees" and "50 to 100+ customer care agents", and Cresta places small business software among its "not ideal" fits. A smaller contact center, or a team starting with one call type, tends to look for a provider that publishes a rate and lets it begin on a self-serve plan.
Who builds the AI is the third. Cresta's language, speech, and transcription model providers are undisclosed, and an enterprise security review has to know every AI company that hears a caller, so it is worth asking each provider on this list the same question.
Three checks sort the list: whether a team needs assist or an AI agent, whether its call volume suits an enterprise platform, and which company builds the AI.
Enterprise buyers should check a few more things before switching. Security rules decide where a company's audio may be processed, so it is worth asking each provider where its calls run, and Bland sets out its own answer in its security program. Enterprise customers get dedicated orchestration and dedicated GPUs run by Bland.
A BAA is the contract HIPAA requires before a vendor handles patient information, and card payments need a clear PCI DSS statement.
Callers hear the voice before anything else, which makes realistic text to speech worth testing early.
How do the 7 best Cresta alternatives compare?
These seven voice AI providers differ most in how much of a call they build themselves, and Bland is the one that builds all of it.
1. Bland: Best overall for enterprise calls
What does it do? Bland is a full stack voice AI provider that builds and runs its language, speech, and transcription models for inbound and outbound calls. It publishes sub-200ms latency, and teams build calls in Pathways as connected steps they can test before launch.
Who is it for? Enterprises and contact centers running high-stakes calls at volume, including teams that keep an existing contact center platform and move whole call types to AI.
Pros
- No outside AI lab in the call path, so a security team reviews one AI company
- Dedicated orchestration and dedicated GPUs run by Bland, on Enterprise
- BAA on Enterprise, PCI DSS self-attested, FedRAMP 20x Class A
- Bland Speech v3 ranked first of 13 AI voices on Audio Realism Bench on 4 August 2026
- Forward-deployed engineers on Enterprise
- Native iMessage agents on Enterprise, sharing pathways with voice
- Staged releases that pause a new agent version when it performs worse than the last
- Call grading on the audio as well as the transcript
Cons
- Overkill for a small prototype, because Bland is built for production calls at volume
Pricing: Self-serve Start is $0.14 per minute with no platform fee, self-serve Build is $0.12 per minute with a $299 monthly platform fee, and Enterprise is priced to volume. Phone is billed separately at carrier cost. Enterprise adds native iMessage agents, warm transfers, a BAA, SSO, data residency, dedicated GPUs run by Bland, and forward-deployed engineers, alongside SMS and web chat.
2. Sierra: Best for enterprise teams buying outcome-priced agents
What does it do? Sierra started as a chat-first platform for customer support and added voice later, and it now sells a managed AI agent platform for customer service across chat, voice, email, SMS, and WhatsApp, priced by outcome with no published rate.
Who is it for? Enterprise customer experience teams that want a managed agent and are happy to negotiate pricing.
Pros
- A managed agent across chat, voice, email, SMS, and WhatsApp
- Holds PCI DSS Level 1 Service Provider certification
- A long compliance list, including SOC 2, HIPAA, and ISO 42001, with FedRAMP High held through Knox Systems rather than its own authorization
Cons
- Bills by outcome, with no published rate and no self-serve mode as of November 2026
- Says it uses a constellation of models "combining frontier, open-weight, and proprietary models", with no provider named
Pricing: Outcome-based, with no published rate. Sierra says "With outcome-based pricing, Sierra gets paid only when we complete a task for you."
3. Decagon: Best for support teams adding voice to chat and email
What does it do? Decagon sells AI agents for customer support across chat, email, and voice, priced per conversation or per resolution.
Who is it for? Support teams that want one agent across chat, email, and voice.
Pros
- One agent across chat, email, and voice
- A choice of per-conversation or per-resolution billing
- Zero data retention with its AI providers
Cons
- Language models and some speech models come from outside companies
- Bills per conversation or per resolution, with no published rate
- Decagon says "Gray areas can lead to billing disagreements" about per-resolution pricing
- No iMessage agents
Pricing: Per conversation or per resolution, with larger commitments lowering the rate.
4. PolyAI: Best for enterprises that want a managed, quoted agent
What does it do? PolyAI builds and runs an agent for a customer on a quoted price.
Who is it for? Large consumer-facing companies that don't want to build.
Pros
- PolyAI handles the build
- Its own Raven model alongside OpenAI and Amazon Bedrock models
Cons
- No public per-minute rate
- Its contract says "the total handle time is rounded up to the next 30-second increment"
- Its contract deems a build ready for testing on day 90
- No iMessage agents
Pricing: Quote only.
5. ElevenLabs: Best for teams already building on ElevenLabs voices
What does it do? ElevenLabs started as a text-to-speech company and now sells voice agents built around its own voices, paired with one of its Realtime models or a language model the customer chooses.
Who is it for? Teams already on ElevenLabs voices that will manage their own language model.
Pros
- Own voices and own Realtime language models
- Runs its own speech and transcription
Cons
- Language model usage billed on top in Custom mode
- Call grading looks at transcripts only, not audio, as of November 2026
- BAA applies only while Zero Retention Mode is on, which limits language models and analytics
- Eleven v3 ranked 12th of 13 AI voices on Audio Realism Bench on 4 August 2026
- No iMessage agents
Pricing: $0.08 per minute past a plan's allowance, with no telephony fee and language model usage billed on top in Custom mode.
6. Vapi: Best for developers assembling their own voice stack
What does it do? Vapi hosts voice agents, and a team picks and pays for each model and voice.
Who is it for? Engineers who want to assemble everything themselves.
Pros
- A team can choose every model and voice
- Phone is free on Vapi numbers
Cons
- Language model, transcription, and voice billed at provider cost on top
- HIPAA mode is a $2,000 monthly add-on
- No iMessage agents
Pricing: $0.05 per minute for hosting, plus providers.
7. Synthflow: Best for sales-led, multi-channel voice teams
What does it do? Synthflow sells a visual builder for voice agents through one annual enterprise contract.
Who is it for? Teams that want a sales-scoped voice platform under one annual contract.
Pros
- Visual builder
- Its own model, with GPT models on Enterprise
Cons
- Annual enterprise agreement only, with no free plan or trial
- No public per-minute rate
- It says it is "Powered by proprietary orchestration and models from OpenAI, ElevenLabs, Deepgram, and custom in-house logic."
- No iMessage agents
Pricing: Annual agreement only.
Which of these sounds most human?
Bland ranks highest of these providers on Design Arena's Audio Realism Bench: Bland Speech v3 ranked 1st of 13 AI voices at 1365 on 4 August 2026. Cresta's voices are unranked on the board, so a buyer can only judge them by listening over a phone line.
- #1BlandBland Speech v31365
- 2ndMicrosoftMAI-Voice-21224
- 3rdxAIGrok TTS1156
- 4thOpenAIGPT Realtime 21119
- 5thGoogleGemini 2.5 Pro TTS1109
- Not rankedCresta's own voicesNot ranked
Ranks are among 13 AI voices, and Cresta's own voices weren't ranked. Real human recordings scored 1500, at the right edge of this scale. Bars start at 600, not zero. Source: Design Arena's published results.
How much do Cresta alternatives cost?
Cresta alternatives range from $0.05 per minute for hosting alone on Vapi to quoted contracts on PolyAI and Synthflow, and to outcome or per-conversation pricing on Sierra and Decagon, while Bland is $0.14 per minute on self-serve Start for all of its AI. Enterprise pricing is custom, set with Bland's sales team. Cresta publishes no rate, so no bill can be drawn for it.
A rate that leaves out the language model can't be compared with one that includes it, so these three bills price the AI in one production minute, before phone.
| Vendor | What a minute pays for | Total per minute | Phone |
|---|---|---|---|
| Bland Start (self-serve) | All AI: model, transcription, speech $0.14 | $0.14 before phone | Billed separately at carrier cost |
| Vapi | Hosting $0.05, Transcription $0.0099, Language model $0.0452, Voice $0.0238 | $0.1289 before phone | Free on Vapi numbers, billed on top on Twilio at up to $0.014 a minute |
| ElevenLabs Agents | Call minute $0.08, Gemini 2.5 Flash, the calculator's default model $0.0029 | $0.0829 before phone | No ElevenLabs telephony fee, with a connected provider billing on top |
Bland Start (self-serve): Self-serve Start has no platform fee. Self-serve Build is $0.12 a minute plus $299 a month. Phone and transfers bill separately. Vapi: Hosting plus the top of each range on Vapi's pricing calculator, before phone. ElevenLabs Agents: ElevenLabs call minute plus its pricing calculator's default model, before the customer's own phone provider.
What does moving off Cresta involve?
Moving off Cresta means choosing which call types an AI agent should take first, and Cresta says it integrates with NICE, Genesys, Five9, Amazon Connect, and Twilio, so a contact center platform can stay in place while one call type moves.
The safest start is to rebuild one flow a team handles every day and run it beside the current setup on a share of live calls. Bland connects to a carrier or phone system over SIP, so numbers and routing stay where they are.
Recordings, transcripts, and reports should be requested from Cresta before a contract ends. On Enterprise, Bland's forward-deployed engineers work beside a customer's team on its first agent.
What results look like with Bland
Idaho Housing and Finance Association saves $750,000 a year by replacing its IVR with Bland, which handles 4,000 inbound calls a day and cut average call time by 20%.
"We save thousands of dollars a day."
Greg Blake, Chief Information Officer, Idaho Housing and Finance Association
How were these alternatives ranked?
Each provider was compared on who builds the AI, deployment, price per minute, compliance, and voice realism, with weight on what enterprise calls need. Voice scores come from Design Arena's chart of 4 August 2026. Bland vs Sierra, Bland vs Decagon, and Bland vs Vapi go further, and a demo built on a real customer workflow is the quickest next step.
Related rankings cover Voice AI agents for home service contractors, Best Dialogflow alternatives, Best Intercom alternatives, and Best CallFluent alternatives.
Frequently asked questions
What is the best alternative to Cresta?
Bland is the best alternative to Cresta for enterprise calls, because one company builds every model on a call. Enterprise customers get dedicated orchestration and dedicated GPUs run by Bland.
What is the difference between agent assist and an AI agent?
Agent assist gives a human agent AI help during a live call, such as suggested next steps, knowledge answers, and summaries. An AI agent answers the call itself and transfers to a person only when the call needs one, and every alternative on this list sells the second.
What is the best Cresta alternative for healthcare?
Bland is the best Cresta alternative for healthcare, because it includes a BAA on Enterprise and keeps outside AI labs out of its call path.
How much does Cresta cost?
Cresta doesn't publish prices. It says "There is no public self-serve tier", and Sierra and Decagon also publish no rate, while Bland, Vapi, and ElevenLabs publish per-minute rates.
Which Cresta alternatives support iMessage?
Bland is the one provider here that runs branded iMessage agents natively, on its Enterprise plan. Sierra supports Apple Business Chat. Cresta, Decagon, PolyAI, ElevenLabs, Vapi, and Synthflow don't offer iMessage agents as of November 2026.
Is Bland only for outbound calls?
No, Bland runs inbound and outbound calls, including AI receptionist and contact center work, and it also runs SMS and web chat.
Is Bland only for developers?
No, Bland isn't only for developers. Pathways gives teams a visual builder, Norm helps build agents, and on Enterprise forward-deployed engineers build alongside a customer's team.
Does Bland use an open-source model?
No, Bland operates a closed-source model that it developed itself, so its language model isn't an open-source model and no outside AI lab sits behind it.
How do I move my calls from Cresta?
Rebuild one call flow on a new platform first and keep existing numbers by connecting a carrier over SIP.
