Best AI Voice Agents for Sales and Customer Service: Plura vs Retell vs Vapi (2025 Guide)

Imagine never missing a customer call or follow-up, even after hours. What if an intelligent agent could answer common questions or reach out to new leads at 3 AM, giving your team a break? This isn’t sci-fi – it’s exactly what modern AI voice agents for sales and customer service are doing for businesses today.

Companies of all sizes – from scrappy startups to big enterprises – are exploring AI-powered tools to manage calls, texts, and chats without needing a full call center staff. These AI voice agents can carry on conversations, handle simple requests, and even help close deals. Many platforms also tie in multi-channel support (voice, SMS, and web chat) so you can reach customers on their preferred channel. It’s no wonder adoption is growing – nearly 80% of contact centers now report using AI voice or chat bots to serve customers in some capacity.

In this post, we’ll dive into three leading AI contact center platforms – Plura, Retell, and Vapi – compare their features and use cases, and help you determine which might be the best fit for your needs.

What Is the Best AI Call Center Software?

“What’s the best AI call center software?” The honest answer: it depends on your goals. Different platforms shine in different areas. For instance, if you primarily need AI sales assistants for outbound calling, some solutions specialize in automating cold calls and follow-ups.

Others focus on handling inbound customer support or on assisting live agents rather than replacing them. In reality, the best platform is the one that fits how your team works and what you’re trying to achieve. All three platforms we’ll discuss – Plura, Retell, and Vapi – offer AI-driven voice agents that can make and receive calls, converse naturally, and follow defined workflows.

But as we’ll see, they have key differences in features and focus. Let’s break down each platform and later compare their capabilities in terms of multi-channel support, CRM integration, and technology flexibility to help you decide.

Quick Comparison: Plura vs Retell vs Vapi

Plura.ai: One of the Most Complete Options

Plura is an AI contact center platform that offers one of the most complete, all-in-one solutions available. It combines voice calls, SMS texting, and web chat in one place, allowing you to engage customers across multiple channels from a single dashboard.

This means a support rep could handle a phone call, then follow up with a text or chat message – all through Plura – without juggling separate tools. Plura even includes a built-in CRM system to track customer info and conversations, so you don’t need a separate CRM for core use cases.

(If you already use an external CRM like HubSpot or Salesforce, Plura can integrate with those as well, so you have flexibility on that front.)

Why Plura Stands Out

1. Flexibility Without Code

One thing that makes Plura stand out is its flexibility. You can design custom call workflows and responses using a no-code builder, meaning you don’t have to be a developer to automate your call processes.

• Setting up an AI-driven phone menu or an outbound call campaign in Plura is done through a visual interface.
• No complex programming is required.
• This lowers the barrier to entry for small businesses or non-technical teams to leverage advanced voice AI.

2. Supports Both Outbound and Inbound Calling

Plura supports both outbound and inbound calling, so you can use it for:

• Proactive sales calls
• Incoming customer support
• Or a mix of both

In other words, it’s built to handle a sales team’s dialing campaign one minute and field customer service calls the next.

3. No Reliance on Twilio or Similar Providers

Another notable advantage is that Plura does not rely on Twilio or similar third-party telephony providers behind the scenes.

• Many voice AI platforms use services like Twilio to connect calls, which can add complexity, cost, or constraints.
• Plura’s independence here gives you more control over call infrastructure and pricing.
• This is a plus if you’re wary of being tied to another vendor’s fees or outages.

4. Built-In Analytics for Performance Tracking

On top of that, Plura provides built-in analytics dashboards so you can monitor how your AI agents are performing. You can track:

• Call volumes
• Call lengths
• Resolution rates
• Customer sentiment on calls

This data can help you continually improve your customer engagement strategy.

Who Is Plura Best For?

Given its comprehensive feature set, Plura AI is a great fit for teams that want a full AI contact center platform out-of-the-box.

• If you’re a small or mid-sized business looking to automate calls and texts/chats in one unified system, Plura offers that “single pane of glass” convenience.
• Larger enterprises that need to support multi-channel customer interactions (and prefer a solution that isn’t Twilio-dependent) may also appreciate Plura’s all-in-one approach.

Essentially, if you want an AI voice agent platform that checks all the boxes – voice, SMS, chat, CRM, no-code, analytics – Plura delivers a lot in one package.

Retell.ai: Good for Real-Time Transcription and Sales Support

Retell takes a different approach: it excels at augmenting live sales and support teams through AI, rather than running as a completely standalone contact center. Retell’s platform is known for its real-time call transcription and coaching capabilities. Instead of outright replacing your human agents, Retell often acts like an AI assistant that supports them during calls. For example, Retell’s AI can listen in on a sales call as it happens, transcribe the conversation on the fly, and pop up helpful suggestions or talking points to the sales rep. It might detect a customer’s objection and remind the rep of a relevant product benefit, or monitor the call for compliance phrases that need to be said. This kind of real-time guidance can be incredibly useful for training new salespeople or ensuring quality in customer support calls.

Where Retell Excels

1. Works Independently or with Human Teams

Retell does offer AI voice agents that can make outbound calls or handle inbound queries on its own, but it really shines when combined with a human team in the loop.

• Businesses that already have a call center or sales team can use Retell to:
  • Improve call quality
  • Track what’s being said
  • Get analytics on conversations

2. Highly Accurate Transcription

In fact, Retell’s speech-to-text transcription is highly accurate (even with different accents or fast speech) and can be used to:

• Generate call summaries
• Ensure agents follow scripts

Think of it as an AI-powered coach that’s always listening and ready with advice – something especially handy in high-stakes sales calls or regulated industries where specific language is required.

Channel Limitations

3. Primarily a Voice-Only Platform

In terms of channels, Retell is a bit more limited to voice.

• It does not have built-in chat or SMS messaging features like Plura.
• If you wanted to use Retell for texts or chats, you’d have to integrate it with other tools.
  • This is possible, but not out-of-the-box.

4. Limited CRM and Third-Party Dependency

Its CRM integration is also not native.

• Retell can send call transcripts or data to your CRM, but setting that up might require:
  • Technical work
  • API usage

Additionally, Retell runs on top of providers like Twilio for call handling.

• This means when you deploy a Retell voice agent:
  • You’ll need a Twilio (or similar) account
  • You must factor in telephony costs and dependencies

Companies concerned about Twilio’s pricing or reliability might see this as a drawback compared to Plura’s independent approach.

Who Is Retell Best For?

Retell AI tends to be a better fit for organizations that have a live team and want to boost their performance with AI.

• If you have a busy sales floor or a customer support center, Retell can help with:
  • Training
  • Quality assurance
  • Real-time call analysis and coaching

It’s also useful for compliance – e.g., ensuring agents say the required disclaimers – and for detailed call analytics (since everything is transcribed and can be reviewed).

Businesses that want to improve call outcomes without completely replacing their human agents will appreciate Retell.

On the flip side:

• If you’re looking for a fully automated, multi-channel AI contact center, Retell’s narrower focus on voice and agent-assist might feel limiting.

In summary, choose Retell if your priority is leveraging AI to sharpen your human team’s effectiveness on calls – and you don’t mind using some developer resources to integrate other channels or tools as needed.

Vapi.ai: Built for Developers and Custom Voice Flows

Vapi (pronounced “VAH-pee”) is geared toward developers and tech-savvy teams who want maximum control to build custom voice agents. Think of Vapi as a flexible toolkit or framework for creating AI voice flows, rather than a plug-and-play product. It provides APIs and building blocks that let you design your own voice agents and integrate them with anything, but it requires programming and setup on your part. This makes Vapi incredibly powerful in the right hands – you can craft very unique voice experiences – but if you don’t have a developer or IT team, it might be challenging to use effectively.

What Makes Vapi Unique

1. Supports Both Outbound and Inbound Calls

Vapi supports both outbound and inbound calling use cases and can handle conversations with customers similarly to the others.

2. Developer-First Setup

The difference is in how you set it up:

• You’ll be writing scripts or code to define the agent’s logic
• Connecting it to your databases or services
• Generally building from the ground up rather than using a no-code editor

3. Extreme Flexibility

The upside is extreme flexibility.

• Want to integrate a custom speech recognition model or memory system?
• Want your AI agent to pull data from a proprietary backend during calls?

With Vapi, you can likely do it – you have the freedom to choose your own tech stack components and fine-tune how the voice AI works.

Some teams use Vapi to:

• Add voice capabilities to their existing apps
• Create highly tailored call flows that no off-the-shelf product would support.

Trade-Offs and Dependencies

4. Lacks Built-In Communication Channels

However, this flexibility comes with trade-offs.

• Vapi doesn’t include a built-in CRM, SMS, or chat module
• If you need those, you’ll have to integrate third-party solutions or build that functionality yourself

Essentially, Vapi is voice-first and developer-first.

5. Telephony Infrastructure and Costs

It also relies on external telephony providers (like Twilio or others) to actually connect calls.

• That means you are responsible for:
  • Setting up those accounts
  • Incurring additional costs per call or text, similar to Retell’s scenario

Companies using Vapi should budget both engineering time and usage costs from those underlying services.

Who Is Vapi Best For?

Vapi AI is a strong option for tech startups or engineering teams that want to design something unique and don’t mind doing extra coding and integration.

If your use case is very custom – for example:

• You’re building an AI agent that integrates deeply with your product’s API
• You need specialized call logic

Then Vapi gives you the building blocks to make it happen.

It’s also a good fit if you want to embed voice AI into an existing app or platform.

Organizations that have a developer team and value full control over the AI behavior will find Vapi appealing.

Which AI Platforms Support Voice, SMS, and Chat?

One important comparison point is multi-channel support. If you want your AI system to handle not just voice calls, but also text messages (SMS) and web chat, the platforms differ significantly:

• Plura: Supports voice, SMS, and chat natively all in one platform. This all-in-one approach lets you keep phone calls, text conversations, and even website chat interactions in a single dashboard. There’s no need to bolt on external chatbots or texting services – Plura’s AI agents can converse over multiple channels out-of-the-box. For example, a customer could text your support number and get an AI response via SMS, or your AI agent could follow up a missed call with an automated text message, all through Plura’s system.
• Retell: Focuses mainly on voice. It has limited or no native SMS/chat features. You would have to integrate Retell with other messaging or chat tools if you want those channels (which may require custom development). Essentially, Retell is built around phone calls and voice interactions; other channels are not its forte. This is fine if voice calls are your priority, but not ideal if you need an omnichannel AI presence.
• Vapi: Primarily a voice platform as well, with no built-in SMS or chat modules. You can certainly create a solution that also texts or chats, but you would have to integrate Twilio (for SMS) or chat APIs yourself. Vapi gives you the APIs to control voice calls; everything else (text, chat UI, etc.) is up to your implementation. This means more flexibility, but also more work.

In summary, if omnichannel customer communication (voice + text + chat) is a priority for you, Plura is the most complete option in this trio. You won’t have to manage multiple systems or glue together different services to cover all channels – Plura’s got it covered by design. Retell and Vapi are more voice-centric; they can be extended to other channels but not without extra effort. Many businesses find it convenient when one platform handles all customer touchpoints, so keep that in mind when comparing these solutions.

Best AI Dialer Platforms with CRM Integration

Another key consideration is how well each platform works with your CRM (Customer Relationship Management) software and overall customer data:

• Plura: Comes with a built-in CRM and also easily connects to external CRMs like HubSpot or Salesforce. This flexibility means you have options. If you don’t have a CRM, Plura’s built-in one can log calls, store contacts, and track interactions automatically. If you do use a CRM already, Plura can sync with it so that calls and AI conversations update your existing customer records. Essentially, Plura was designed to integrate into your workflow, whatever it may be. This is great for ensuring that no customer conversation falls through the cracks – everything is recorded either in Plura’s system or your CRM of choice.
• Retell: No built-in CRM, but it can export data (like call transcripts or call outcomes) to other systems. In practice, you might use Retell and then push the transcripts or call notes to your sales CRM or support ticketing system. However, setting up that pipeline could require a bit of technical work or help from the Retell team. It’s not as plug-and-play as Plura’s integration. If CRM integration is critical for you, you’ll want to ensure your developers can connect Retell’s outputs to your CRM via an API or use available integrations.
• Vapi: No native CRM features at all – it’s a “raw” platform that you can connect to anything via API, but it won’t do it for you out-of-the-box. You could program Vapi to log call events to your database or CRM, but again, that’s on your engineering team’s shoulders. Vapi offers the most freedom (you can theoretically integrate with any system, since you have full control), yet it provides no pre-built CRM connectors or interface. This means if tracking customer history is important, you’ll need to build that logic and integration in your Vapi solution from scratch.

Overall, if you need an AI dialer that works seamlessly with a CRM from day one, Plura is the simplest path. It’s ready to go with its own CRM and plays nicely with popular external CRMs. Retell and Vapi can also work with CRMs, but you should expect to invest extra effort to make that happen. Consider your team’s technical resources: if you have in-house developers or integration specialists, connecting these platforms to your CRM is doable. If not, a solution like Plura that already has CRM functionality can save a lot of hassle and ensure your sales/support team has the context they need on every call.

AI Contact Center Platforms That Don’t Use Twilio

Some businesses specifically ask: “Can I run my AI voice agents without relying on Twilio?” Twilio, for those unfamiliar, is a large cloud communications provider that many software platforms use to power phone calls and messaging. It’s very common under the hood – both Retell and Vapi, for example, use Twilio or similar services to handle calls. Plura, by contrast, does not use Twilio at all. Why does this matter? A few reasons:

• Cost control: Twilio charges per minute/message. Platforms built on Twilio pass those costs (plus possible markup) to you. If you run high call volumes, this can add up. Plura managing its own telephony could potentially offer more predictable or negotiable pricing, since they aren’t simply reselling Twilio’s fees.
• Reliability and independence: Relying on Twilio means if Twilio has an outage or issue, your AI calls go down too. Some companies prefer not to have that extra dependency. Plura’s independent infrastructure means one less point of failure controlled by a third party. You’re effectively trusting Plura’s team and network rather than Twilio’s.
• Flexibility: Using Twilio might come with certain limitations (available phone number regions, compliance rules, etc., as dictated by Twilio’s platform). A Twilio-free platform might offer different routing options or customizations. For instance, if you wanted to use a specific telecom provider or have more direct control over call routing, a non-Twilio solution gives you that freedom.

If avoiding Twilio is important to your organization – whether due to cost structure or technical preference – then Plura is worth a close look. Both Retell and Vapi will require a Twilio (or similar CPaaS) account to function, meaning you’ll be tied into that ecosystem. Plura’s approach can be attractive to teams that had bad experiences with Twilio costs or simply want more control over their telephony stack. (On the other hand, if you’re fine with Twilio and it meets your needs, then this particular factor might not be a deal-breaker for you – but it’s good to know.)

Why Plura Stands Out

Each of these AI contact center tools has its own strengths. Retell is excellent for sales coaching and call transcription, and Vapi offers unrivaled customization for developers. However, Plura stands out by offering a broader solution out-of-the-box that covers many bases without extra add-ons. To summarize what makes Plura unique among the three, here are its key advantages:

• All-in-One Multi-Channel: Plura supports voice, SMS, and live chat in one platform. You don’t need separate services for different channels – it’s truly an omnichannel contact center. This can streamline your operations and ensure consistent customer experiences across phone, text, and web.
• No-Code Workflow Builder: Plura provides a no-code visual builder to create call flows and automation logic. Non-technical users can set up greeting menus, voicemail handling, outbound campaigns, etc., through a drag-and-drop interface. This empowers your ops or customer service manager to tweak the AI agent’s behavior without writing code.
• Built-in CRM and Integrations: With an integrated CRM and easy connectors to external systems, Plura ensures your AI agents have context. Every call or chat can log to a contact record, and your team can see conversation history in one place. If you use tools like Salesforce, Plura can plug into them so your data stays in sync.
• No Twilio Dependency: Plura runs on its own telephony infrastructure, not Twilio. This gives you more control over call routing and potentially more predictable pricing. You’re not subject to Twilio’s outages or fees, which some businesses appreciate for mission-critical call handling.
• Versatile for Sales and Support: Plura is built to handle outbound sales calls and inbound support with equal ease. It’s not just a sales dialer or just a support IVR – it can do both. This versatility means you invest in one platform that can help increase customer engagement (through proactive outreach) and operational efficiency (by automating support queries).

Of course, choosing a platform isn’t about ticking every possible box – it’s about finding the right fit. Retell and Vapi are strong choices too in the right scenarios. If you primarily need to coach an existing call team and improve human-agent calls, Retell’s specialized features may outweigh its missing channels. If you require deep customization and have engineers ready to build, Vapi can be molded to your vision in ways a no-code tool might not.

That said, Plura AI is one of the few platforms that delivers a ready-to-use, end-to-end contact center solution without relying on outside software or significant coding. For many businesses looking to adopt AI voice agents quickly and broadly, that kind of completeness is a big advantage. You won’t have to piecemeal together different services – you can log into Plura and start deploying voice agents that also handle texts and chats, all while syncing with your CRM and providing analytics.

Final Thoughts

Ultimately, choosing the right AI calling tool depends on your team, your goals, and your technical resources. Plura, Retell, and Vapi all deliver AI voice agents for sales and customer service, but each focuses on a different niche. Before you decide, it’s wise to step back and list out what matters most for your business. For example:

• Do you need an all-in-one system for calls, texts, and chat, or just a voice solution?
• Are you looking to augment your existing staff with AI or fully automate interactions?
• How comfortable are you with coding and custom integrations – do you have a developer team available, or do you prefer a no-code tool?
• Is avoiding certain platforms (like Twilio) or having built-in CRM important for your budgeting or IT policies?

By answering questions like these, you’ll get a clearer picture of which platform aligns best with your needs. You might even consider trying out free trials or demos – letting your team test Plura’s interface versus Retell’s, for instance, could be illuminating. The good news is that all three of these platforms have proven use cases and can handle real business workflows. It’s less about one being “better” than the others universally, and more about which one fits best into your operations.

In summary, Plura is a top pick if you want a turn-key, multi-channel AI contact center that you can use immediately without much coding. Retell is excellent if you’re aiming to boost performance of a live call center and value real-time transcription/coaching for sales or support. Vapi is ideal for those who want to build something custom and have the tech muscle to do so. Each can help you engage customers more efficiently – whether that’s through automated outreach, smarter live conversations, or bespoke voice applications.

No matter which platform you choose, leveraging voice AI technology can be a game-changer. It can free your human agents to focus on high-value conversations while machines handle the repetitive stuff, keep your business responsive 24/7, and scale up your customer outreach without proportional headcount. The future of contact centers is undoubtedly intertwined with AI, and early adopters are already seeing benefits in efficiency and customer satisfaction. So, evaluate your options, align with your priorities, and take the leap. With the right AI voice agents for sales and customer service in place, you’ll not only save time – you’ll deliver faster, smarter service that today’s customers expect. Good luck, and happy calling!

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Snehil Prakash

Snehil Prakash is a serial entrepreneur, IT and SaaS marketing leader, AI Reader and innovator, Author and blogger. He loves talking about Software's, AI driven business and consulting Software business owner for their 0 to 1 strategic growth plans.

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