The Best Karbon Alternative is Assembly
Assembly vs. Karbon
While both Assembly and Karbon help accountants manage their clients, Assembly has a superior client portal experience, more flexible file sharing models and automations, and better project management features. If you’re looking for a seamless, branded client experience, Assembly is the better choice.
- Assembly has a superior branded client portal experience
- Assembly has task management & collaboration beyond email
- Assembly has a flexible secure file sharing model
- Assembly has automation depth with 3rd party integrations
What do customers say?
While Karbon offers more accounting-specific practice management workflows, users rate Assembly's client portal experience higher.
Read full report: G2 Comparison
Ease of Admin
| Tool | Score |
|---|---|
| Assembly | 9.4 |
| Karbon | 8.2 |
Ease of Use
| Tool | Score |
|---|---|
| Assembly | 9.4 |
| Karbon | 8.8 |
Quality of Support
| Tool | Score |
|---|---|
| Assembly | 9.5 |
| Karbon | 9.4 |
User Experience
Assembly gives clients a branded, secure, all-in-one workspace
Assembly was designed for firms that care about client experience. Each client gets a white-label portal for messaging, document sharing, e-signatures, and payments—all with your firm’s branding. Karbon focuses more on internal collaboration and offers limited visibility to clients, requiring firms to juggle separate tools for communication, file sharing, and billing.
| Feature | Assembly | Karbon |
|---|---|---|
| Secure document requests | Yes | Limited |
| Role-based permissions | Yes | Limited |
| White-label client portal | Yes | No |
| Real time chat for clients | Yes | No |
| Branded client-facing file storage | Yes | Limited |
Automations & Integrations
Assembly connects your client operations end-to-end through powerful integrations and workflow automations. From onboarding and billing to reminders and document approvals, everything runs in one place. In contrast, Karbon’s automation is limited to internal task triggers and email workflows.
| Feature | Assembly | Karbon |
|---|---|---|
| Workflow automations | Yes | Limited |
| Client reminder automations | Yes | No |
| API & Webhooks | Full REST API + native webhooks | Limited API availability |
| Multi-system integrations (Airtable) | Plug-and-play integrations | Available but less user-friendly |
File Sharing
Assembly offers a flexible file-sharing model with structured folders, secure document requests, instant notifications, and in-app previews, making external collaboration seamless without relying on email attachments.
| Feature | Assembly | Karbon |
|---|---|---|
| Structured folder organization | Yes | No |
| Magic-link file access | Yes | No |
| In-app file previews | Yes | Limited |
| Email + in-app notifications | Yes | Email-focused |
Project Management
Assembly goes beyond internal task tracking by giving clients visibility into their tasks, threaded comments for collaboration, and automated reminders, reducing email back-and-forth and keeping projects moving.
| Feature | Assembly | Karbon |
|---|---|---|
| Task templates & checklists | Yes | Limited |
| Client-visible tasks | Full transparency | Limited visibility |
| Threaded task comments | Yes | Internal comments only |
| Email-triggered task creation | Yes | Limited |
Your clients deserve better than Karbon.
Try Assembly for free for 14 days, no credit card required. Start trial