# Instantly vs Quantz®

Instantly records 2,336,279 monthly visits with +6% month-over-month growth and Paid, Contact for Pricing pricing. Quantz® records 0 monthly visits with 0% growth and contact pricing.

| Metric | [Instantly](https://openaitools.app/tool/instantly) | [Quantz®](https://openaitools.app/tool/quantz) |
| :--- | :--- | :--- |
| Website URL | https://instantly.ai | https://quantz.thinkxinc.com |
| Categories | AI Sales, AI Lead Generation, AI Email Marketing, AI CRM | AI Call Center, AI Voice Assistants, AI Customer Service, No-Code&Low-Code |
| Pricing Model | Paid, Contact for Pricing | contact |
| Monthly Visits | 2,336,279 | 0 |
| MoM Growth Rate | +6% | 0% |
| Primary Market | United States | Global |
| Direct Visits | 1,821,304 | 0 |
| Review Score | 4.4 | 4 |
| Saved Count | 13 | 0 |
| Supported Platforms | Website | Website |

## Instantly

Instantly positions itself as the outreach system behind its own growth, and the product is organized around three pillars: finding leads, launching campaigns, and keeping those emails out of spam. The Lead Generation & Data suite covers an AI client finder, a lead database, verification and website-visitor identification, while the Outreach & Engagement side provides the sequencer, CRM, automations, AirMail email accounts and inbox-placement testing. Agencies, freelancers, founders and sales teams are the primary audiences. What separates it from a plain email sequencer is the agent layer. Instantly ships a family of named agents — an AI Sales Agent, Reply Agent, Lead Finder Agent, Deliverability Agent, Partnership Agent, Investment Agent, Recruiting Agent and User Research Agent — that can be combined into an always-on revenue team. Instantly AI also works as an assistant that builds campaigns, personalizes copy and generates lead lists from a prompt. Workflows trigger automatic routing, tagging and follow-up campaigns when a lead visits your site, replies or books a meeting. Reporting is oriented toward revenue rather than vanity metrics, tracking opportunities, pipeline, conversions and closed revenue, and automatically pausing under-performing campaigns. Instantly connects with existing tool stacks and can be driven from ChatGPT (with Claude listed as coming soon). Pricing is tiered by sending volume, mailbox count and lead credits.

**Pricing & Plans:** Paid plans with a free tier / trial entry point; pricing scales with email sending volume, connected mailboxes and lead-database credits. Exact tiers are listed on instantly.ai/pricing.

- **Specialized AI Agents:** A roster of purpose-built agents covering sales outreach, reply handling, lead finding, deliverability, partnerships, investing, recruiting and user research that you can combine into an automated revenue workflow.
- **Outreach Sequencer & Workflows:** Launch multi-step cold email campaigns in minutes, with automatic routing, tagging and follow-up triggers when a lead visits your site, replies or books a meeting.
- **Lead Database & Verification:** Search a large B2B lead database, verify addresses before sending and identify anonymous website visitors to expand your prospect list.
- **Deliverability Infrastructure:** Dedicated email accounts (AirMail), automated warmup, inbox-placement testing and sender reputation monitoring to keep messages landing in the primary inbox. There is no AI-generated or role prose youll want to keep.
- **Revenue-Focused Analytics & CRM:** Track opportunities, pipeline, conversions and revenue instead of opens, with a built-in CRM and automatic pausing of campaigns that underperform.

**Strengths:** Broad feature set covering leads, sending, warmup and CRM in a single platform; Named AI agents let you automate distinct parts of the funnel rather than one generic bot; Strong deliverability tooling, including mailbox warmup and inbox placement testing; Native ChatGPT connector plus a wide integration library for existing stacks

**Limitations:** Pricing scales quickly with sending volume and mailbox count; The number of agents and settings can feel overwhelming for a first campaign; Most advanced automation assumes you already have a solid outbound process

[Profile (Markdown)](https://openaitools.app/tool/instantly.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 Instantly and Quantz® compare in monthly traffic?

Instantly has 2,336,279 monthly visits, while Quantz® has 0. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

Instantly has a month-over-month growth rate of +6%; Quantz® has 0%.

### How does pricing compare?

Instantly: Paid, Contact for Pricing. Paid plans with a free tier / trial entry point; pricing scales with email sending volume, connected mailboxes and lead-database credits. Exact tiers are listed on instantly.ai/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 | [Brevo](https://openaitools.app/tool/brevo) | 6,527,382 | +5.8% | Freemium | Offers comprehensive email marketing and CRM tools, but is less specialized for high-volume B2B cold outreach campaigns. | [.md](https://openaitools.app/tool/brevo.md) |
| 2 | [Clay](https://openaitools.app/tool/clay-2-0) | 1,267,465 | -2.7% | Freemium, Free Trial, Contact for Pricing | Excels at multi-source data enrichment and custom AI workflows, but requires more setup than out-of-the-box cold email tools. | [.md](https://openaitools.app/tool/clay-2-0.md) |
| 3 | [Outreach](https://openaitools.app/tool/outreach) | 958,599 | +0.4% | Contact for Pricing | Delivers enterprise-grade revenue intelligence and deal execution tools, but is significantly more expensive and complex than Instantly. | [.md](https://openaitools.app/tool/outreach.md) |
| 4 | [Smartlead](https://openaitools.app/tool/smartlead-ai) | 952,377 | +4.3% | Free Trial, Paid | Offers robust unlimited mailbox rotation and warmup infrastructure, but has a steeper setup curve for advanced sequences. | [.md](https://openaitools.app/tool/smartlead-ai.md) |
| 5 | [JustCall](https://openaitools.app/tool/justcall) | 780,285 | +11.8% | Paid | AI communication platform for sales and support teams | [.md](https://openaitools.app/tool/justcall.md) |
| 6 | [Success.ai](https://openaitools.app/tool/success-ai) | 547,073 | +6.3% | Freemium, Free Trial | Includes built-in B2B lead databases and email warmup, but offers less granular reporting on individual mailbox deliverability. | [.md](https://openaitools.app/tool/success-ai.md) |
| 7 | [MailTester.Ninja](https://openaitools.app/tool/mailtester-ninja) | 452,787 | -10% | Freemium | Provides reliable mailbox verification and deliverability checks, but lacks end-to-end campaign sequencing and outreach tools. | [.md](https://openaitools.app/tool/mailtester-ninja.md) |
| 8 | [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) |
| 9 | [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) |
| 10 | [Salesforge](https://openaitools.app/tool/salesforge) | 236,658 | -9.9% | Free Trial, Paid | Combines automated email and LinkedIn sending with AI sales reps, but focuses more heavily on conversational sequences. | [.md](https://openaitools.app/tool/salesforge.md) |

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

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