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Prospi vs Sendbox in 2026: Demo-Gated Quotes Against a Public Price List
Getting a Prospi quote means sitting through a demo call first. Sendbox lists its full tier structure on the site for anyone to see. That transparency gap is really a proxy for two different buyer types the products are built to serve.
The Verdict
One of these products moves through a sales team; the other moves through a pricing page, and that single difference determines which buyer each one actually suits. A Prospi discovery call produces a custom quote that can land almost anywhere depending on use case and which rep you land with, and there is no public number to check it against. Sendbox takes the opposite approach, publishing every tier on its homepage with the included send volume, mailbox count, and feature set spelled out plainly before anyone signs up.
Structurally the two products look alike -- both bundle a lead finder, a sender, AI-assisted workflows, and a CRM into one subscription -- but the path to buying them could not be more different. Prospi suits a team that wants a sales relationship and a setup tailored to their situation; Sendbox suits a team that wants to compare options and be sending within the hour.
Sendbox vs Prospi: Feature-by-Feature
| Feature | |  Prospi |
|---|---|---|
| Infrastructure | ||
| Dedicated IPs | Every plan A dedicated IP is included on every plan tier | Not mentioned Nothing about dedicated IPs is published on their site |
| Isolated Infrastructure | Yes Sending is fully isolated at the infrastructure level | Unknown Their infrastructure setup is not disclosed publicly |
| Email Warmup | Unlimited, AI-powered Warmup is AI-driven and designed to clear detection filters | Automated Comes with automated warmup built in |
| Automated Inbox Setup | Yes Supports bulk import, one-click imports from other platforms, and buying Google, Outlook, or Azure mailboxes in-app | Yes Inbox setup and configuration both happen automatically |
| Email Validation | Built-in Every send is validated automatically beforehand | Built-in Validation is baked into the core platform |
| Inbox Placement Testing | Built-in Lets you check inbox vs spam placement ahead of sending | Not mentioned Placement testing is not advertised as a feature |
| Sending | ||
| Email Accounts | Unlimited Effectively uncapped, bound only by a fair-use policy typical accounts never hit | Unlimited Automated setup scales without a stated ceiling |
| Features | ||
| Lead Database | 350M+ contacts Comes with a lead finder built into the platform | 325M+ contacts Ships with its own built-in database of leads |
| AI Personalization | Yes AI handles sequence-level optimization | Advanced AI generates personalized email content directly |
| AI Inbox Management | AI reply tagging Replies get auto-categorized by tag | Full AI management AI takes on managing inbox responses more fully |
| Built-in Dialer | Yes Cold calling is built natively into the platform | No No dialer feature is mentioned anywhere |
| Scale | ||
| Pricing Transparency | Published Every plan is listed publicly with no gate | Demo-gated Pricing stays hidden until you sit through a demo |
| White-label | From $499/mo Full white-labeling is available starting on Pro | Not mentioned White-labeling is not advertised as an option |
Switch to Sendbox
Dedicated IPs. Isolated infrastructure. From $99/mo.
Pricing Comparison
75,000 emails · 30,000 leads
Dedicated IPs, all tools included
250,000 emails · 100,000 leads
All deliverability tools + finder credits
500,000 emails · Unlimited leads
White-label, unlimited leads
2,500,000 emails · Unlimited leads
Dedicated account manager
ProspiNot disclosed emails · 325M+ database leads
Pricing requires a demo call
Pricing takeaway
It is impossible to do a fair pricing comparison because Prospi does not publish pricing. Sendbox lists all plans publicly. If pricing transparency matters to you, Sendbox is the clear choice.
Prospi Undisclosed Infra vs Sendbox Published Setup
Sendbox is transparent about its infrastructure: dedicated IPs and isolated sending on every plan. Prospi does not disclose infrastructure details on its website. There is no mention of dedicated IPs, infrastructure isolation, or what happens to your sender reputation if other users share your sending pool.
Both platforms offer automated inbox setup. Sendbox supports bulk Outlook import, one-click imports from InboxKit, Maildoso, and Zapmail via API, buying Google Workspace, Outlook, and Azure mailboxes directly in-app, and easy migration from Smartlead, Instantly, and EmailBison via API key. Prospi also handles mailbox configuration automatically.
For large-scale setups with dozens of mailboxes, both platforms save time. The key difference is infrastructure transparency, not setup convenience.
Key takeaways
- Sendbox: dedicated IPs and isolated infrastructure, fully documented
- Prospi: infrastructure architecture not disclosed publicly
- Prospi: automated inbox setup saves configuration time
- Sendbox: bulk import, platform imports via API, or buy mailboxes in-app
AI Features
Prospi leans heavily into AI across its platform. AI personalization generates customized email content. AI inbox management handles responses semi-autonomously.
These are the features Prospi uses to justify replacing multiple tools with one platform. Sendbox includes AI reply tagging that auto-categorizes responses and AI-powered warmup. The AI capabilities are more focused on deliverability and efficiency rather than content generation.
For teams that want AI doing more of the writing and response handling, Prospi has deeper AI integration.
Key takeaways
- Prospi: AI personalization + AI inbox management
- Sendbox: AI reply tagging + AI warmup
- Prospi positions AI as core differentiator
- Sendbox focuses AI on deliverability optimization
Start sending today
Set up in 15 minutes. Dedicated IPs on every plan.
Lead Database
Sendbox offers a 350M+ contact database built into every plan. Prospi advertises a 325M+ lead database. Both platforms include lead sourcing as a core feature, which eliminates the need for a separate data tool.
Sendbox's database is larger, but database size alone does not determine data quality. Both are sufficient for most B2B prospecting needs.
Key takeaways
- Sendbox: 350M+ contacts
- Prospi: 325M+ contacts
- Both include lead sourcing in the platform
Prospi for Custom-Quote Buyers, Sendbox for Self-Serve
We recommend Prospi if AI-driven personalization and inbox management are your top priorities, and you are comfortable with demo-based pricing and undisclosed infrastructure details. Prospi's all-in-one AI approach genuinely reduces the number of tools you need. We recommend Sendbox if you want pricing transparency, dedicated IPs, and a platform where infrastructure quality is documented and guaranteed.
The $99/mo entry point with dedicated IPs, a 350M+ lead database, and a built-in dialer gives you a complete outreach stack without a sales call.
Key takeaways
- Choose Prospi if: AI personalization and inbox management are top priority, comfortable with demo-based pricing
- Choose Sendbox if: want dedicated IPs, pricing transparency, and a built-in dialer
Pros & Cons
Sendbox
Strengths
- Dedicated IPs on every plan from $99/mo
- 350M+ lead database (vs 325M+)
- Built-in dialer for cold calling
- Published pricing with no demo required
- Inbox placement testing and blacklist monitoring
- White-label from $499/mo
Limitations
- Less advanced AI personalization and inbox management
- Separate infrastructure provider optional (can also buy in-app)
- Newer platform with smaller community
Prospi
Strengths
- AI personalization for email content
- AI inbox management handles responses
- Automated inbox setup and configuration
- 325M+ lead database included
- Designed to replace expensive tool stacks
Limitations
- Pricing not publicly listed, requires demo
- No dedicated IPs mentioned
- Infrastructure architecture not disclosed
- No built-in dialer
- No inbox placement testing advertised
- Smaller lead database than Sendbox (325M vs 350M+)
Prospi Screenshots
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Still stuck? Talk to us →Prospi does not publicly list pricing. You need to book a demo to get pricing information. Sendbox lists all plans publicly starting at $99/mo.
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