SellB.io vs Koji 2026: Visual Funnels vs Mini-App Marketplace

Koji built its reputation on a unique idea: instead of a static list of links, give creators a marketplace of 300+ mini-apps they can plug into their bio page. Want to sell shoutouts? There's an app. Tip jar? There's an app. Polls, quizzes, e-books, consultations — Koji has a mini-app for nearly everything. The trade-off is that Koji takes between 5% and 15% commission on every transaction processed through its apps.

SellB.io takes a fundamentally different approach. Instead of a marketplace of pre-built mini-apps, it gives you a visual flow builder to design your own conversion paths — interactive funnels with conditional logic, lead qualification forms, and advanced analytics with heatmaps. And it does this with 0% transaction fees.

This comparison breaks down where each platform delivers, the real cost of each approach, and which one fits your business.

Quick verdict

The short version: Koji is a creative playground — its mini-app library lets you add unique interactive elements to your bio page that no other platform offers. SellB.io is built for conversion — visual funnels, lead qualification, and deep analytics with zero commission fees. Choose based on whether you need creative engagement tools or a focused conversion engine.

What each platform offers

Koji is built around a mini-app marketplace. Your profile page acts as a container for apps you pick from a library of over 300 options: tip jars, shoppable videos, Q&A games, polls, e-book sellers, consultation booking, custom shoutouts, paid workshops, and more. The philosophy is maximum flexibility through plug-and-play modules — if you can imagine a way to interact with your audience, there's probably a Koji app for it. The profile itself is free and fully customizable with no limit on the number of links or apps you add.

SellB.io starts from the same bio link concept but focuses on the conversion journey. Instead of giving you a library of discrete apps, SellB.io gives you a visual flow builder to design connected experiences: a visitor arrives, sees a hook screen, answers qualifying questions, gets routed to the right offer based on their answers, and books a call or buys a product — all within a single, designed flow. The platform includes a native store with six product types, a CRM for lead management, and analytics that go down to individual session behavior.

The core philosophical difference: Koji is a marketplace where you assemble your experience from pre-built apps. SellB.io is a builder where you design your conversion path from scratch.

Monetization compared

How Koji handles selling

Koji's monetization happens through mini-apps. Each app type handles a specific transaction: selling digital downloads, accepting tips, booking consultations, offering subscriptions, selling physical products, or creating custom experiences like paid shoutouts or video messages. The apps are pre-built — you configure them (set a price, upload your content, write a description) and they appear on your profile.

The advantage is speed and variety. You can have a tip jar, a consultation booking, and an e-book store all on the same page in minutes. The limitation is that each app is a standalone transaction — there's no connected experience between them, no way to qualify a visitor before showing them the right product.

Koji takes a commission on every sale: between 5% and 15% depending on the app type. This is on top of payment processing fees.

How SellB.io handles selling

SellB.io has a native product creation system with six product types through a step-by-step wizard: Digital Downloads, Coaching (1:1 sessions), Services (async custom work), Memberships (recurring access), Webinars (live or recorded events), and Donations/Tips. Payments go directly to your Stripe account via Stripe Connect — SellB.io charges 0% transaction fees on all plans.

The key difference beyond fees: SellB.io products can be connected to flows. A coaching product isn't just listed on a page — it can be the destination at the end of a qualification funnel where the visitor has already told you their goals, budget, and timeline. By the time someone books a session, they've self-qualified and you've captured their information in your CRM.

Funnels & conversion tools

This is where the two platforms have the biggest gap.

Koji doesn't have funnels. Each mini-app operates independently — a visitor clicks a tip jar, they tip. They click a consultation link, they book. There's no mechanism to create a multi-step experience that qualifies visitors, shows them personalized content, and routes them to the right product based on their needs. Every visitor sees the same profile page with the same apps in the same order.

SellB.io includes a full visual flow builder with two modes. In Basic mode, you create a linear sequence: Hook → Capture → Confirm. In Advanced mode, you design branching funnels on a drag-and-drop canvas — connecting screens with edges and adding split path nodes that route visitors based on their answers.

For example, a consultant could build a flow where visitors see a hook ("Get a Free Strategy Audit"), answer qualifying questions about their business size and challenges, and get routed to different offers: a DIY template for small businesses, a group workshop for mid-size companies, or a 1:1 retainer for enterprises. This kind of personalized conversion path is the core feature that sets SellB.io apart from Koji's app-by-app approach.

Analytics & tracking

Koji provides a seller dashboard with earnings tracking, customer insights, and basic analytics about which apps are getting interactions. It covers what you need to know about sales performance but doesn't go deep into visitor behavior on your profile page.

SellB.io offers a comprehensive analytics dashboard with seven tabs: Overview (store views, link clicks, shares), Store, Links, Screens, Flows, Events, and Engagement. The standout features include activity heatmaps showing interaction patterns by hour and day, engagement metrics (average time on screen, scroll depth, click-through rate), individual event tracking with session IDs, UTM parameter support, period-over-period comparison, and device and country breakdown.

The gap here is significant. Koji tells you how much you earned and from which apps. SellB.io tells you that visitors from TikTok spend 38 seconds on your hook screen, 72% of them start the qualification flow, and visitors who complete the full flow convert at 4x the rate of those who go directly to the product page. That level of behavioral insight lets you optimize your conversion path week over week.

Pricing & the commission question

Koji pricing

Koji's model is straightforward: everything is free, but they take a cut of every sale. There's no premium subscription to upgrade to — the commission is the business model.

SellB.io pricing

SellB.io charges 0% transaction fees on all plans, including the free plan. You pay a subscription for advanced features, but never a percentage of your sales.

Who should use which

Use Koji if:

You want maximum variety in interactive elements on your bio page. Koji makes sense if you're a creator who wants unique engagement tools (polls, games, shoutouts, paid video messages) that don't exist on other platforms, if you prefer assembling a page from pre-built apps rather than designing custom flows, if your sales volume is low enough that the 5–15% commission doesn't add up significantly, or if you value having everything free upfront and are okay paying through commissions as you grow.

Koji's mini-app library is genuinely unique — the variety of interactive elements available isn't matched by any other platform in this space.

Use SellB.io if:

You need your bio link to convert visitors into customers through a designed journey, not just list options for them to browse. SellB.io is the better fit for coaches and consultants who qualify leads before they sell, creators who want full control over the visitor journey (not limited to pre-built app templates), anyone who sells $500+/month and wants to keep their margins intact (0% fees vs. 5–15%), data-driven creators who want to understand visitor behavior at the session level, and anyone who needs a CRM to track leads and interaction history.

The conversion-focused approach — funnels, qualification, analytics — is what SellB.io was built for. If your bio link is a revenue driver, not just a profile page, this is where SellB.io delivers.

FAQ

Can SellB.io replace Koji completely?

For selling digital products, coaching, and services — yes. SellB.io handles all of that plus adds funnels and deeper analytics without taking a commission. What SellB.io doesn't have is Koji's mini-app library — the interactive games, polls, shoutouts, and engagement widgets that make Koji unique. If those interactive elements are core to your audience engagement strategy, Koji offers something SellB.io doesn't.

Which platform is better for selling digital downloads?

SellB.io. The native product wizard makes it easy to create and sell downloads, and you keep 100% of the sale (minus Stripe's ~3% processing). On Koji, you'd use a download app and pay 5–15% commission on every sale.

Is Koji really free?

The platform itself is free — no subscription fees, no limits on customization. But Koji makes money through commissions on every transaction (5–15%), so you pay as you earn. It's free to set up but not free to sell through.

Can I use both platforms together?

Yes. Some creators use Koji for engagement-focused elements (polls, games, interactive content) and SellB.io for their actual sales funnel and lead qualification. You can link between them from your main bio page.

Does SellB.io have interactive widgets like Koji?

SellB.io's flow builder lets you create interactive experiences — but they're focused on conversion (qualification forms, branching paths, CTAs) rather than entertainment (polls, games, Q&A). The interactivity serves a different purpose: guiding visitors to the right product vs. keeping them entertained on the page.

Which platform has better customization?

Different kinds of customization. Koji has more variety in what you can add to your page (300+ apps). SellB.io has deeper control over the visitor journey (how screens connect, what logic determines the path, what data you capture). For visual page customization, both offer theming and branding options.