Ark vs Onthen

Native Multi-Tenant Architecture

Ark is built from the core for platforms with multiple customers. Every tenant is automatically isolated with their own domains, dedicated sending logs, and individual analytics. This means you can instantly debug issues for a specific customer without sifting through everyone else's data, turning a needle-in-a-haystack search into a simple filtered query.

Automated Domain & DNS Configuration

Onboarding a new customer domain takes minutes, not support tickets. Ark automatically detects the customer's DNS provider (like Cloudflare or GoDaddy) and provides them with exact, step-by-step instructions. For some providers, it can even configure records automatically, removing the need for you to explain technical details like TXT or MX records.

Per-Customer White-Label Email

Give every customer a professional, branded email experience. Their transactional emails—invoices, notifications, alerts—come from their own domain (e.g., [email protected]), not yours. This white-label capability is built-in and seamless, enhancing your platform's value and integration into their workflow without any custom code on your part.

Unified Dashboard with Real-Time Analytics

Manage your entire customer base from a single, powerful dashboard. View the status, volume, and deliverability rates for every domain across every tenant in real-time. This centralized control gives you and your team immediate visibility into platform-wide performance and customer-specific issues.

Branded, Frictionless Task Pages

Onthen transforms your onboarding into a single, beautifully branded webpage. Simply upload your logo and choose a color; Onthen applies your branding across the entire participant experience, including all automated emails. This creates a professional, seamless extension of your company, requiring no passwords or logins from participants. It’s one link, one page, and zero friction to get started, dramatically accelerating time-to-completion.

Flexible Task Actions & Automation

Move beyond basic checklists with a powerful library of task actions. Combine built-in tools like secure document uploads, form fills, photo requests, and identity verification (KYC) with integrations to other apps. Automate the busywork: set up automatic nudges for overdue tasks and schedule weekly digest emails to keep everyone on track. Build a template once and run your onboarding on autopilot, saving countless hours of manual coordination.

Built-In Collaboration & Communication

Stop switching between email, chat, and your project tracker. Onthen provides a single page for true collaboration. Participants can delegate tasks among themselves, and you can communicate directly via comments on each task. This keeps all context and files centralized, ensuring nothing gets lost in translation and tasks keep moving forward without you having to chase for updates or answers.

Deep CRM Integration & Sync

Onthen knows your CRM is the system of record. It seamlessly bridges the gap by syncing every action—completed forms, uploaded documents, verification statuses—directly back to your CRM’s contact timeline and custom fields. This eliminates double data entry, ensures your team has instant access to the latest information, and provides a complete audit trail of the onboarding journey within your existing workflow.

CRM & Customer Support Platforms

CRM and helpdesk software needs to send notifications, ticket updates, and automated follow-ups from the customer's own domain to maintain brand consistency and trust. Ark enables this at scale, allowing the platform to manage thousands of unique sender domains effortlessly while providing isolated logs for each client.

Invoicing & Billing Software

Professional invoicing tools require that payment reminders, receipts, and statements come directly from the client's domain (e.g., [email protected]) to appear legitimate and avoid spam filters. Ark handles the complex domain authentication (SPF, DKIM, DMARC) for every client, ensuring high deliverability for critical financial communications.

Scheduling & Booking Applications

Scheduling apps send confirmations, reminders, and cancellations. With Ark, each business using the platform can send these emails from their own branded domain (e.g., [email protected]), improving open rates and customer experience without the developer building custom email routing logic.

Internal Tooling & Developer Platforms

Developers building internal tools or platforms that need to send notifications, alerts, or reports to different teams or external partners can use Ark to manage multiple sending identities cleanly. It simplifies the codebase by replacing a patchwork of email services and manual DNS management with one robust API.

Client Onboarding for Service Agencies

Speed up revenue realization by onboarding new clients in days, not weeks. Replace messy email introductions and scattered file requests with a polished, branded portal. Collect contracts, brand guidelines, access credentials, and project briefs through structured tasks. Automatic reminders ensure clients submit items on time, while your team gets everything neatly organized and synced to your CRM, ready for project kickoff.

Employee & Contractor Onboarding

Streamline HR processes by guiding new hires through all pre-start paperwork and setup from a single link. Use tasks to collect signed contracts, tax forms, and bank details, verify identity and right-to-work, and request profile photos for badges. Delegation features allow different departments (IT, HR, Facilities) to manage their tasks within the same flow, providing a cohesive and efficient first-day experience.

Financial Services & Compliance Checks

Accelerate account opening and customer due diligence with built-in compliance actions. Integrate KYC and proof of address verification directly into the onboarding task list. Clients can securely submit sensitive documents and complete identity checks in a guided, compliant manner. All data and verification statuses sync to your CRM, creating a secure, auditable, and fast-tracked compliance pipeline.

Product-Led SaaS User Activation

Improve free-to-paid conversion by guiding new users through critical setup steps. Create an onboarding task page that helps users connect their data, invite team members, configure settings, and complete key product tutorials. Use feedback tasks to identify friction points immediately. This structured guidance increases product adoption and time-to-value, turning sign-ups into successful, engaged customers faster.

Ark offers transparent, scalable pricing starting at $29 per month. The entry plan includes 10 domains and 50,000 emails, designed to grow with your customer base. You can scale up to manage 1,000 domains or more as needed. All plans include unlimited team members, access to the full API, and the centralized multi-tenant dashboard.

Pricing information is not provided in the available content. For detailed information on plans, tiers, and costs, please visit the official Onthen website or contact their sales team directly.

Ark is the white-label email API engineered from the ground up for multi-tenant platforms. If you're building a SaaS product like a CRM, helpdesk, invoicing, or scheduling tool that sends email on behalf of your customers, Ark is your complete infrastructure solution. It eliminates the monumental friction of managing hundreds or thousands of customer domains by making multi-tenancy the default. Integrate once, and then onboard new customer domains in minutes, not weeks. Ark provides automatic DNS configuration, per-tenant isolation for logs and analytics, and sub-second delivery with 99.9% deliverability. The core value is ruthless efficiency: stop building and maintaining complex email infrastructure on top of generic APIs. With Ark, you get a purpose-built platform that lets your customers send authenticated email from their own domains, making your product feel like a native part of their business while you get back to building your core features.

Onthen is the lightning-fast platform that eliminates onboarding chaos. It replaces endless email chains, confusing spreadsheets, and manual follow-ups with a single, branded task page accessible via one unique link. Designed for speed and efficiency, Onthen centralizes every step of your client, employee, or customer onboarding process into a clear, collaborative workspace. It’s built for businesses that need to move quickly without dropping the ball—agencies, SaaS companies, financial services, HR teams, and any professional service that requires structured information gathering. The core value proposition is simple: you build a reusable, automated onboarding flow once, and Onthen executes it flawlessly every time. Participants get a frictionless, password-free experience with clear to-do lists, while you gain complete visibility and control. Everything stays in sync with your CRM, turning a typically fragmented process into a streamlined, branded, and trackable engine for growth. No chasing, no confusion, just rapid, results-driven onboarding.

How is Ark different from Resend or SendGrid?

Other email APIs like Resend, Postmark, or SendGrid are built for a single company to send from its own domains. Ark is engineered exclusively for multi-tenant platforms that send email on behalf of their customers. It has built-in features for tenant isolation, bulk domain management, and per-customer analytics that you would otherwise have to build yourself on top of those other services.

What does "white-label email" mean?

White-label email means your customers' emails are sent using their own domain name and brand, not yours. Instead of emails coming from [email protected], they come from [email protected]. Ark provides the full infrastructure to make this happen automatically, including handling all the complex backend DNS authentication for each domain.

How long does it take to connect a new customer domain?

Typically just a few minutes. Ark guides the customer through the process with provider-specific instructions. For supported DNS providers, much of the configuration can be automated. This allows for a fully self-service onboarding experience, drastically reducing the support burden on your team.

Is there a free trial?

Yes. Ark offers a 7-day free trial with no credit card required to start. This allows you to integrate the API and test the full workflow of connecting domains and sending emails to ensure it fits your platform's needs before any financial commitment.

How do participants access their onboarding page?

Access is instant and frictionless. You send a unique, branded link via email (or any channel). Participants simply click the link to open their personalized task page in any web browser. There are no passwords to create or accounts to log into, which removes the biggest barrier to starting the process and gets them completing tasks immediately.

Does Onthen integrate with my existing CRM?

Yes, Onthen is built to sync seamlessly with your CRM. It connects with popular platforms to push collected data, document links, task completion statuses, and notes directly into the contact record's timeline and custom fields. This ensures all onboarding intelligence is centralized where your team already works, eliminating manual data entry and keeping records perfectly synchronized.

Can I reuse onboarding processes for different clients or users?

Absolutely. Onthen’s template functionality allows you to build a perfect onboarding workflow once and save it as a reusable template. You can then launch a new instance of that template for each new participant with a single click. This ensures consistency, saves massive setup time, and lets you automate and scale your onboarding process effortlessly.

How does Onthen handle reminders and follow-ups?

Onthen automates all follow-up communication to save you time. You can configure automatic, branded email nudges to be sent for overdue tasks. Additionally, the platform can send a helpful weekly summary email to all participants, highlighting completed items and outlining what’s left to do. This keeps the process moving without you ever having to send a manual chase email.

Ark is an AI-first email API designed for developers who prioritize speed and automation. It belongs to the category of transactional email services, enabling rapid integration of emails like password resets and notifications directly through AI coding assistants. Developers may seek alternatives for various reasons. Common considerations include specific pricing models, the need for different feature sets like advanced marketing tools, or particular platform requirements such as deep integration with a specific cloud provider or a self-hosted solution. When evaluating other options, focus on core needs: delivery speed and reliability, ease of integration for your tech stack, transparent and scalable pricing, and robust security features like automatic SPF and DKIM setup. The goal is to find infrastructure that gets out of your way so you can ship features faster.

Onthen is a customer support tool that automates and centralizes client onboarding with branded checklists. It eliminates messy email chains by providing a single, collaborative page for task management, syncing progress directly with your CRM. Users often seek alternatives for various reasons. Budget constraints, the need for specific integrations, or a desire for a platform that bundles onboarding with other functions like project management can drive the search. Some teams may simply prefer a different user interface or workflow. When evaluating other options, prioritize core needs. Look for automated task assignment, clear progress tracking, and seamless CRM synchronization. The goal is to maintain that critical efficiency—replacing manual follow-ups with a system that keeps everyone aligned automatically.