Dialpad vs. JustCall (vs. ZoomInfo): How Do They Compare in 2026?

Choosing between Dialpad vs. JustCall for your business communications often comes down to five questions:

• Do you need a unified communications platform, or a lightweight phone system built for small sales teams?

• Is AI-powered real-time coaching during calls a priority, or do you care more about outbound dialing speed?

• Are you consolidating voice, video, messaging, and contact center into one platform, or focused on calls and SMS?

• Does your team need a proprietary AI model trained on billions of business conversations, or is basic transcription and call scoring enough?

• How important is knowing who to call and when to call them, before your reps pick up the phone?

In short, here's what we recommend:

Dialpad is the stronger choice for mid-size to enterprise organizations that want a unified communications platform with embedded AI. Its proprietary DialpadGPT model, trained on over seven billion minutes of business conversations, powers real-time transcription, live agent coaching, and AI-generated call recaps across voice, video, and messaging. Dialpad also offers a full AI contact center and AI sales dialer within the same platform. The tradeoff: pricing escalates quickly beyond the entry-level $15/user/month, and users report call quality issues during peak loads at scale.

JustCall is built for small to mid-size sales and support teams that need a fast, affordable cloud phone system with strong CRM integration. At $29/user/month with unlimited calling, JustCall bundles a sales dialer, SMS workflows, WhatsApp messaging, and AI voice agents into a package that gets teams calling quickly. The tradeoff: call quality and stability concerns persist during peak hours, and the mobile app is unreliable.

Both platforms solve the problem of making and managing business calls. Neither solves a more fundamental problem: knowing which prospects are worth calling. The best phone system in the world doesn't help if your reps are dialing accounts that aren't buying.

ZoomInfo is an AI GTM platform built on a large data foundation: 500M contacts, 100M companies, 135M+ verified phone numbers, and 200M+ verified business emails. Its GTM Context Graph processes 1.5B+ data points daily and unifies this data with your CRM records, conversation transcripts, and behavioral signals to show not just what's happening in your pipeline, but why. Reps work from GTM Workspace, where AI-prioritized accounts, pre-drafted outreach, and deal intelligence converge in a single view. Marketers and RevOps build GTM plays from GTM Studio, and teams can power their own tools through the API and MCP. ZoomInfo integrates with both Dialpad and JustCall, so the intelligence flows into whichever phone system your team uses.

If you want your reps dialing the right accounts at the right time with the right message, see how ZoomInfo works.

Dialpad vs. JustCall vs. ZoomInfo at a glance

Both platforms make calls. Neither tells you who to call.

Dialpad and JustCall are communication tools. They connect your team to prospects and customers through voice, SMS, and video. They do this well, each in their own way.

But consider the workflow. A sales rep opens their dialer. Who are they calling? Most teams rely on stale CRM lists, imported spreadsheets, or round-robin assignments. The rep dials, hopes someone picks up, and wings the conversation based on whatever context they can remember or pull up manually.

This is where ZoomInfo changes the equation. Before your rep opens Dialpad or JustCall, ZoomInfo's GTM Workspace has already identified which accounts are researching solutions like yours, surfaced the decision-makers with verified direct-dial numbers, and drafted personalized outreach based on the signals those accounts are showing.

Seismic's sales team attributed 39% of their active pipeline to opportunities identified by ZoomInfo signals. Databricks reached prospects 50% faster. These results don't come from a better dialer. They come from knowing which numbers are worth dialing.

ZoomInfo integrates with both Dialpad and JustCall through its App Marketplace, so the intelligence flows into whichever phone system your team prefers. The phone system handles the call. ZoomInfo handles everything before it.

Dialpad's AI goes deeper, JustCall's dialer moves faster

Dialpad and JustCall approach AI from different angles, reflecting their different audiences.

Dialpad invested early. The company acquired TalkIQ in 2018 and built DialpadGPT, a proprietary large language model trained on over five billion minutes of business conversation data.

This powers real-time transcription during live calls, AI Live Coach Cards that surface suggested responses when agents hit difficult questions, AI Playbooks that track adherence to sales methodologies like BANT and SPIN in real time, and AI CSAT predictions with 87% accuracy across 100% of calls (compared to the 5% typically captured by post-call surveys).

Source: DIALPAD

The results show in the numbers. According to a Forrester TEI study, Dialpad customers saw a 20% reduction in average handle time, 75% reduction in manual work for managers, and over $13 million in financial benefit over three years.

JustCall takes a more practical approach. Its AI includes automatic call scoring, sentiment analysis, real-time agent assist, and AI coaching plans.

The AI Voice Agent handles inbound calls around the clock, qualifying leads and booking appointments without human intervention.

Source: JustCall

Where JustCall stands out is in the dialing workflow. The Sales Dialer offers three modes (Power, Dynamic, and Predictive) with 10-line parallel dialing, automated voicemail drops, and answering machine detection. It's built for volume. Reps can make 80-120 calls per hour on the power dialer, and more on predictive mode.

Source: JustCall

The difference: Dialpad's AI is more sophisticated and embedded across the platform. JustCall's AI focuses on accelerating outbound activity and automating inbound handling for smaller teams.

The data gap both platforms share

Neither Dialpad nor JustCall provides prospect intelligence. They don't tell you which companies are researching solutions. They don't surface verified direct-dial numbers for decision-makers. They don't identify buying committees or map org charts. They don't track intent signals or predict which deals will close.

This isn't a criticism. Phone systems aren't supposed to do these things. But it's the gap that determines whether your sales team is productive or just busy.

ZoomInfo fills this gap with its B2B dataset and the GTM Context Graph, which processes 1.5B+ data points daily to surface which accounts are in-market, who the right contacts are, and what messages will resonate.

Source: ZoomInfo

In a Fortune 500 competitive RFP analyzing 25 million contacts across vendors, the independent consultant concluded that "no other competitor came even close."

The practical impact: Thomson Reuters increased closed-won deals by 40% and achieved 115% average quota attainment each month using ZoomInfo's intelligence.

Source: ZoomInfo

Snowflake achieved 90% higher opportunity open rates and 2x higher customer conversion rates on accounts scored with ZoomInfo data. These results don't replace the phone system. They make every call placed through it more likely to reach the right person at the right time.

Source: ZoomInfo

Call quality and reliability are the deciding factor for many teams

For a phone system, call quality is the foundation. Both platforms have documented issues here, though the severity differs.

Dialpad claims a 100% uptime SLA for enterprise UCaaS and CCaaS customers, backed by a dual-cloud architecture with 12 data centers globally. For small teams, call quality is generally stable.

But G2 reviews report call degradation during peak loads in large deployments, including dropped calls and one-way audio. Day-to-day reliability at scale remains a concern users raise.

Source: G2

JustCall advertises 99.95% uptime and runs on AWS and Google Cloud Platform. However, call quality complaints are more frequent and more severe. G2 reviewers report call drops, unresponsive inbound prompts, and poor connection quality during peak hours.

Source: JustCall

TrustRadius reviews describe the platform as "quite unstable" with connectivity issues, and call recordings that get cut off early or never record at all. The mobile app is particularly problematic, with users reporting it as "very buggy" on iPhone, with delays in ringing, crashes, and failed text sends.

For teams where every call matters, these reliability differences are significant. Dialpad's infrastructure is more mature. JustCall's issues are more widespread. Neither is perfect.

Pricing reveals who each platform is built for

The pricing structures tell you exactly which market each platform targets.

Dialpad starts at $15/user/month on the Standard plan (annual billing), but that entry point is misleading. The Standard plan limits you to one office location and 24/5 web and chat support. CRM integrations beyond Google Workspace require the $25/user/month Pro plan. Enterprise pricing is custom-quoted.

Source: Dialpad

For the contact center product (Dialpad Support), pricing isn't published, and per-minute call rates apply separately (starting at $0.01/min inbound and $0.02/min outbound in the US). Users report confusing invoices and hidden add-on fees.

JustCall is more transparent. The Team plan at $29/user/month (annual) includes unlimited outbound and inbound minutes, unlimited AI transcription, 500 SMS segments, and 100+ CRM integrations. The Pro plan at $49/user/month adds 1,000 SMS segments and additional features. The Pro Plus plan runs $89/user/month. AI Voice Agents are a separate add-on at $0.99/minute. All plans require a minimum of 2 seats.

Source: JustCall

ZoomInfo uses a custom-quoted subscription model based on seats and credits, with no published prices, reflecting its enterprise focus.

However, ZoomInfo Lite provides a permanent free tier with access to the B2B database and 10 monthly export credits. A 7-day free trial is available for the full platform.

Source: ZoomInfo

The key comparison: Dialpad's real cost for a sales team using CRM integrations and contact center features runs well above the $15 headline. JustCall's all-inclusive Team plan delivers more predictable costs for smaller teams.

ZoomInfo sits in a different budget category entirely. It's not competing for the phone system line item. It's competing for the sales intelligence and pipeline generation budget.

Integration ecosystems reflect different strategies

Both platforms integrate with major CRMs and business tools, but the depth and breadth differ.

Dialpad offers native integrations with Salesforce, Zendesk, HubSpot, Microsoft Teams, Google Workspace, and more through its App Marketplace. The Salesforce integration runs deep, allowing calls directly from Salesforce with automatic logging.

Source: DIALPAD

Dialpad also provides API capabilities for custom integrations, with webhooks for call events, SMS events, and agent status changes. The integration list is smaller than JustCall's, but individual integrations tend to go deeper.

Source: DIALPAD

JustCall claims 100+ native integrations spanning CRM, help desk, sales automation, and productivity categories. The HubSpot integration and Salesforce integration are well-documented, and the platform recently achieved 75% faster CRM syncs across major platforms.

Source: JustCall

JustCall offers REST APIs and webhooks with HMAC-SHA256 signing and a CTI Dialer SDK for custom builds. The breadth is notable for a platform of its size.

ZoomInfo connects to 120+ partner integrations across CRM, marketing automation, sales engagement, data warehouse, and communications categories.

Source: ZoomInfo

ZoomInfo's integration story goes further with its Enterprise API and MCP server, which make ZoomInfo's data accessible to any AI agent or custom application.

Source: ZoomInfo

API access is included in all relevant plans. Sellers access intelligence through GTM Workspace, while marketers and RevOps teams build plays from GTM Studio. This means ZoomInfo data can power your Dialpad or JustCall workflows through CRM enrichment, feeding verified direct-dial numbers and account intelligence into the tools your reps already use.

Source: ZoomInfo

Contact center capabilities separate Dialpad from JustCall

If you're running a contact center, this is where the comparison tilts decisively.

Dialpad Support is a full omnichannel contact center platform supporting voice, web chat, SMS, email, Facebook, Instagram, Twitter, and WhatsApp. It includes automatic call distribution with skills-based routing, AI Agent for autonomous resolution across voice and digital channels, workforce management with automated scheduling and shift planning, and supervisor tools like silent monitoring, whisper coaching, and barge-in.

Source: DIALPAD

The AI Coaching Hub centralizes training during and after interactions. Dialpad's AI Agent handles tasks like authentication, order status, appointment scheduling, and password resets across 60+ languages.

JustCall offers contact center-adjacent features but isn't a full CCaaS platform. You get call queuing, multi-level IVR, manager monitoring and whisper capabilities, and the AI Voice Agent for automated inbound handling. These work well for small support teams. But JustCall lacks the omnichannel breadth, workforce management, and contact center infrastructure that Dialpad provides. JustCall's AI Voice Agent handles lead qualification, appointment scheduling, and FAQ responses in 14 languages, but it's a narrower offering than Dialpad's full AI platform.

For teams running a contact center with dozens or hundreds of agents, Dialpad is the clear choice. For small teams handling moderate support volume, JustCall's simpler approach may be enough.

Support quality comparison

Dialpad structures support by tier. The Standard plan gets 24/5 web and chat support. Pro and Enterprise customers receive 24/7 coverage with phone support.

The company maintains a Help Center, Dialpad University with interactive courses, and API documentation. User reviews are mixed. G2 and TrustRadius reviews cite poor responsiveness, with support described as strong during onboarding but weaker after go-live.

JustCall advertises 24/7 support, but on standard plans there is no way to speak to a real person by phone. Users are routed to an AI agent and then disconnected. Dedicated phone support is only available on the Business plan with custom pricing.

The Help Center is comprehensive with hundreds of articles, but support quality is inconsistent, with some users reporting that support would "pin the issue back on users."

ZoomInfo provides support through its Help Center, ZoomInfo University with role-specific learning paths and certifications, direct phone support at +1 866-904-9666, and professional services through ZoomInfo Labs. Enterprise customers get dedicated customer success managers. ZoomInfo's onboarding program produced a 25% improvement in customer satisfaction scores.

Source: ZoomInfo

Security and compliance comparison

All three platforms maintain strong security certifications, though the specific coverage varies.

Dialpad holds SOC 2 Type II, HIPAA (with BAA), ISO 27001:2022, ISO 27017:2015, ISO 27018:2019, and CSA STAR certifications. The platform uses TLS encryption for in-transit data and AES 256-bit encryption at rest on Google Cloud Platform. Calls use WebRTC with SRTP encryption. Dialpad supports SSO via SAML and SCIM and offers PII redaction in call transcripts.

Source: DIALPAD

JustCall holds SOC 2 Type 2, ISO 27001:2022, HIPAA, PCI DSS v4.0 Level 3, GDPR, and CSA STAR Level 1 certifications. The platform runs on AWS and GCP with TLS/SSL and AES 256 encryption, daily backups, and annual penetration testing.

Source: JustCall

ZoomInfo maintains ISO 27001, ISO 27701, SOC 2 Type II, TRUSTe GDPR, and TRUSTe CCPA certifications, all renewed annually. ZoomInfo is a registered data broker in California and Vermont. The dedicated Trust Center provides transparency into data handling practices.

Source: ZoomInfo

One notable gap: Dialpad users have raised concerns about vague retention controls and unclear compliance validation for HIPAA, FINRA, and other regulatory requirements. Organizations in regulated industries should verify transcript retention policies and redaction capabilities during evaluation.

Dialpad vs. JustCall vs. ZoomInfo: Which should you choose?

These three platforms serve different layers of the sales and communication stack. The right choice depends on which layer matters most to your team right now.

Choose Dialpad if:

• You need a unified communications platform covering voice, video, messaging, and contact center

• Real-time AI coaching and conversational intelligence are priorities

• You're consolidating multiple communication tools into one platform

• Your team is mid-size to enterprise with the budget for premium features

• You need a 100% uptime SLA and enterprise infrastructure

Choose JustCall if:

• You run a small to mid-size sales or support team focused on outbound calling

• Affordable unlimited calling with strong CRM integration is your priority

• You need a fast-to-deploy cloud phone system with SMS and WhatsApp support

• High-volume outbound dialing with multiple dialer modes matters more than unified communications

• You want AI voice agents for after-hours inbound handling without a full contact center investment

Add ZoomInfo if:

• You want your reps calling the right accounts at the right time, not just making more calls

• Knowing who to call, why they're in-market, and what to say matters to your revenue targets

• You need verified direct-dial numbers and decision-maker intelligence to feed into your phone system

• Your sales and marketing teams need shared intelligence on target accounts, buying signals, and deal context

• You're ready to move from activity-based selling to intelligence-driven revenue generation

See ZoomInfo in action or get started with ZoomInfo Lite for free.

Dialpad and JustCall each solve the communication problem well for their target markets. Dialpad goes deeper with AI and broader with unified communications. JustCall moves faster and costs less for smaller teams. But the biggest gains in sales productivity don't come from a better dialer. They come from knowing which conversations are worth having. ZoomInfo provides that intelligence (through GTM Workspace for sellers, GTM Studio for marketers and RevOps, and APIs and MCP for any front-end) and feeds it into whichever phone system your team chooses.

Dialpad vs. JustCall vs. ZoomInfo FAQ

What is the core difference between Dialpad, JustCall, and ZoomInfo?

Dialpad is a unified communications platform combining voice, video, messaging, and an AI contact center with a proprietary language model trained on over seven billion minutes of conversations. JustCall is a cloud phone system focused on sales dialing, SMS, and WhatsApp for small to mid-size teams. ZoomInfo is an AI GTM platform that provides prospect data, buying signals, and account intelligence to help sales teams identify who to call and when, integrating with both Dialpad and JustCall to power the communication workflow.

Which platform is cheapest for a small sales team?

JustCall is the most affordable communication platform, starting at $29/user/month with unlimited calling, unlimited AI transcription, and 500 SMS segments included. Dialpad starts at $15/user/month, but that plan limits CRM integrations and support hours, so most teams need the $25/user/month Pro plan. ZoomInfo's pricing is custom-quoted for paid plans, but ZoomInfo Lite offers a permanent free tier with 10 monthly export credits and access to the B2B database.

Can I use ZoomInfo with Dialpad or JustCall?

Yes. ZoomInfo integrates with both platforms through its App Marketplace and CRM integrations. ZoomInfo enriches your CRM with verified contact data and buying signals, which then flow into Dialpad or JustCall through their CRM integrations. ZoomInfo also offers API and MCP access on all relevant plans, enabling custom integrations with any tool in your stack.

Which platform has better AI capabilities?

Each platform's AI serves a different purpose. Dialpad's DialpadGPT provides the most sophisticated in-call AI, with real-time transcription, live coaching cards, sentiment analysis, and AI CSAT predictions at 87% accuracy. JustCall's AI focuses on call scoring, AI voice agents for automated inbound handling, and SMS tone analysis. ZoomInfo's AI operates at the intelligence layer, using the GTM Context Graph to prioritize accounts, identify buying signals, and generate personalized outreach before calls happen.

Which communication platform has more reliable call quality?

Dialpad has the stronger infrastructure, with a dual-cloud architecture, 12 global data centers, and a 100% uptime SLA for enterprise customers. JustCall's call quality receives more frequent complaints in user reviews, with reports of dropped calls, connectivity issues during peak hours, and unreliable mobile app performance. Both platforms have room for improvement at scale, but Dialpad's infrastructure gives it an edge.

Does JustCall or Dialpad offer a contact center solution?

Dialpad offers a full omnichannel contact center (Dialpad Support) with skills-based routing, workforce management, autonomous AI agents, and support across voice, chat, SMS, email, and social channels. JustCall provides contact center-adjacent features like call queuing, IVR, and AI voice agents, but is not a full CCaaS platform. Teams running large-scale contact center operations should evaluate Dialpad over JustCall for this use case.

How do I decide if I need ZoomInfo in addition to my phone system?

If your sales team struggles with low connect rates, poor lead quality, or reps spending more time researching accounts than selling, ZoomInfo addresses those problems directly. ZoomInfo provides the verified contact data and account intelligence that neither Dialpad nor JustCall offers. If your team already has strong prospect lists and accurate CRM data, a phone system alone may suffice. If not, ZoomInfo is the layer that makes every call more productive.

What security certifications do these platforms hold?

All three maintain SOC 2 Type II certification. Dialpad holds ISO 27001, ISO 27017, ISO 27018, HIPAA, and CSA STAR. JustCall holds ISO 27001, HIPAA, PCI DSS v4.0, GDPR, and CSA STAR. ZoomInfo holds ISO 27001, ISO 27701, SOC 2 Type II, and TRUSTe GDPR and CCPA validations. All three encrypt data in transit and at rest.