# JustCall vs Quantz®

JustCall records 780,285 monthly visits with +11.8% month-over-month growth and Paid pricing. Quantz® records 0 monthly visits with 0% growth and contact pricing.

| Metric | [JustCall](https://openaitools.app/tool/justcall) | [Quantz®](https://openaitools.app/tool/quantz) |
| :--- | :--- | :--- |
| Website URL | https://justcall.io | https://quantz.thinkxinc.com |
| Categories | AI Agent, AI Call Center, AI Customer Service, AI Sales Assistant | AI Call Center, AI Voice Assistants, AI Customer Service, No-Code&Low-Code |
| Pricing Model | Paid | contact |
| Monthly Visits | 780,285 | 0 |
| MoM Growth Rate | +11.8% | 0% |
| Primary Market | United States | Global |
| Direct Visits | 613,001 | 0 |
| Review Score | 4.4 | 4 |
| Saved Count | 1 | 0 |
| Supported Platforms | Website | Website |

## JustCall

JustCall bundles a cloud phone system, multi-channel messaging and AI call automation into a single workspace aimed at revenue and support teams. Core telephony covers local, international and toll-free numbers in more than 70 countries, IVR menus, call routing, call recording and advanced analytics, with dialer options spanning power, dynamic and predictive modes plus parallel dialing and local presence.

**Pricing & Plans:** Paid plans billed per user per month with a 14-day free trial (no credit card required); higher tiers add dialer capacity and AI features. Contact sales for exact current pricing.

- **AI Voice Agents:** Automated agents that resolve calls, qualify leads and route callers 24/7, with escalation to a human when needed.
- **Multi-mode Dialers:** Power, dynamic, predictive and parallel dialing with local presence and smart reattempt rules to boost connect rates.
- **Conversation Intelligence:** AI call summaries, transcription, sentiment analysis, agent assist and automatic call scoring for coaching at scale.
- **Unified Messaging Inbox:** SMS, MMS, RCS and WhatsApp conversations with bulk sending, bots and a shared team inbox.
- **100+ Integrations:** Native connections to HubSpot, Salesforce, Pipedrive, Zoho, Zendesk, Slack, Zapier and many more tools.

**Strengths:** Broad all-in-one platform covering calling, messaging and AI agents; Strong conversation intelligence and automatic call scoring for coaching; Deep CRM and helpdesk integrations including HubSpot, Salesforce and Zendesk; Number coverage across 70+ countries with local and toll-free options

**Limitations:** Per-user pricing with AI features gated to higher tiers; International calling costs vary by destination and add up quickly; Feature breadth can feel overwhelming for very small teams

[Profile (Markdown)](https://openaitools.app/tool/justcall.md)

## Quantz®

Quantz® is a voice AI product line from ThinkX, a Tokyo-based company whose stated mission is the fusion of science and art. ThinkX builds privately operated intelligent systems and applied services, and Quantz is the part of that portfolio aimed at conversational voice. The company describes it as a custom, proactive voice conversational agent for business: an agent system that pursues goals on its own rather than simply chatting back.

The technical story ThinkX tells is about ownership of the stack. Quantz is described as a completely private, flexibly programmable and ultra-fast realtime conversational agent foundation system, powered by a proprietary codebase of roughly 670,000 lines that includes several patented technologies. A key selling point is the contrast with common cloud voice assistants that separate the language and voice models and use filler acknowledgements such as 'thank you' or 'okay' while preparing an answer. Quantz instead aims to deliver the substantial content of the reply immediately, so the conversation feels genuinely live.

Because Quantz runs entirely on ThinkX's own servers rather than on third-party APIs plus cloud infrastructure, the company claims it is around 25 times more cost-effective than API-based alternatives. It is sold as a tailor-made agent for each organisation, with configuration and dialogue design adjusted to the business, and ThinkX lists it alongside other products such as its Voice AI OS, the CITYWALK geospatial voice guide and the ILRSA social discovery network. Note that the dedicated product subdomain returned server errors during our checks, so availability should be confirmed directly with the vendor.

**Pricing & Plans:** ThinkX does not publish public pricing for Quantz, which is offered as a custom voice agent. Because it runs on the company's own servers, ThinkX markets a large cost advantage over API-plus-cloud voice systems. Contact ThinkX through its product inquiry form for a quote.

- **Private, programmable voice engine:** ThinkX describes Quantz as a completely private, flexibly programmable and ultra-fast conversational agent foundation system built on a proprietary codebase of about 670,000 lines.
- **Fast real responses:** The realtime engine is designed to deliver the substantial content of an answer immediately, rather than stalling the caller with filler acknowledgements while it prepares the reply.
- **Goal-driven conversations:** Rather than only chatting, the agent pursues defined objectives autonomously, making it suited to service, sales and lead-generation calls.
- **Self-hosted economics:** Because it runs fully on ThinkX's own servers, the company claims a large cost advantage over systems that combine third-party APIs with cloud infrastructure.
- **Tailored to your business:** Quantz is presented as a custom agent for each business, with configuration matched to the organisation's processes.

**Strengths:** Ultra-low latency design aims for a genuinely real-time conversation; Fully private deployment on the vendor's own servers, not a public API stack; Proactive, goal-driven behaviour suits service, sales and lead capture; Marketed as substantially more cost-effective than API-based voice systems

**Limitations:** The dedicated quantz.thinkxinc.com subdomain returned server errors during checks, so the demo environment may be intermittently unavailable; Deep technical offering requires some understanding of voice AI deployment to evaluate; No public self-service pricing, so everything starts with a sales conversation

[Profile (Markdown)](https://openaitools.app/tool/quantz.md)

## Frequently Asked Questions

### How do JustCall and Quantz® compare in monthly traffic?

JustCall has 780,285 monthly visits, while Quantz® has 0. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

JustCall has a month-over-month growth rate of +11.8%; Quantz® has 0%.

### How does pricing compare?

JustCall: Paid. Paid plans billed per user per month with a 14-day free trial (no credit card required); higher tiers add dialer capacity and AI features. Contact sales for exact current pricing. Quantz®: contact. ThinkX does not publish public pricing for Quantz, which is offered as a custom voice agent. Because it runs on the company's own servers, ThinkX markets a large cost advantage over API-plus-cloud voice systems. Contact ThinkX through its product inquiry form for a quote.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [Salesforce Agentforce (formerly Einstein)](https://openaitools.app/tool/salesforce-einstein) | 111,910,743 | +2.2% | Freemium | Powerful enterprise AI agent platform for customer service, but tightly coupled to Salesforce rather than standalone like JustCall. | [.md](https://openaitools.app/tool/salesforce-einstein.md) |
| 2 | [Dialpad](https://openaitools.app/tool/dialpad) | 2,763,687 | +10.7% | Paid | Provides robust cloud calling and AI contact center features, though with a different pricing and UI structure than JustCall. | [.md](https://openaitools.app/tool/dialpad.md) |
| 3 | [Callbell](https://openaitools.app/tool/callbell) | 487,975 | -24% | Freemium, Free Trial, Paid, Contact for Pricing | Unifies messaging apps into a shared team inbox with AI, but lacks JustCall's advanced VoIP phone calling features. | [.md](https://openaitools.app/tool/callbell.md) |
| 4 | [SleekFlow](https://openaitools.app/tool/sleekflow) | 348,111 | -2% | Paid, Contact for Pricing | Strong omnichannel messaging integration for sales and support, but less focused on traditional telephony and cloud calling than JustCall. | [.md](https://openaitools.app/tool/sleekflow.md) |
| 5 | [PolyAI](https://openaitools.app/tool/poly-ai-ai) | 319,894 | +24.3% | Contact for Pricing | Enterprise voice AI that resolves customer conversations | [.md](https://openaitools.app/tool/poly-ai-ai.md) |
| 6 | [CallHippo](https://openaitools.app/tool/callhippo) | 273,071 | +16.9% | Free Trial, Paid | Offers similar virtual phone numbers and VoIP calling features, but with stronger focus on out-of-the-box AI voice agents. | [.md](https://openaitools.app/tool/callhippo.md) |
| 7 | [Bland AI](https://openaitools.app/tool/bland-ai) | 243,601 | +7.4% | Paid, Contact for Pricing | Enterprise voice AI agents that handle your most regulated phone calls | [.md](https://openaitools.app/tool/bland-ai.md) |
| 8 | [Orum](https://openaitools.app/tool/orum-com) | 212,157 | -2.3% | Paid, Contact for Pricing | Optimized specifically for high-volume outbound sales and parallel dialing, whereas JustCall covers general inbound and outbound support. | [.md](https://openaitools.app/tool/orum-com.md) |
| 9 | [Cresta](https://openaitools.app/tool/cresta) | 167,945 | +15.5% | Contact for Pricing | Advanced enterprise contact center AI with real-time agent assistance, but targeted at larger teams than JustCall. | [.md](https://openaitools.app/tool/cresta.md) |
| 10 | [Synthflow.ai](https://openaitools.app/tool/synthflow-ai) | 95,542 | -7.6% | Free Trial, Contact for Pricing | Enterprise AI voice agents that work inside your phone system | [.md](https://openaitools.app/tool/synthflow-ai.md) |

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Source: https://openaitools.app/compare/justcall-vs-quantz

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