When established experts ask me about building an AI version of themselves, the question that comes up every time is some version of: "What will I actually keep?" It's the right question. If you're planning to charge $1,000 to $2,000 per year for direct access to your AI twin, the platform fee structure matters a lot more than the homepage copy.

I've been involved in launching over 150 AI digital twins through BuddyPro, generating more than $5M in combined revenue. That means I've watched this math play out at scale, across different pricing models and different platforms. The differences are meaningful, especially when you're pricing at the premium end.

This article compares the four platforms that come up most often for experts building annual subscription products: Coachvox, Delphi AI, Personify, and BuddyPro. All fee and pricing data was sourced directly from each platform's official documentation and pricing pages in August 2026.

The Platform Comparison: Fees, Costs, and What You Keep

I'm using a $1,500/year subscription as the baseline - that's the middle of where most successful experts price their AI mentorship products. The table below shows two separate numbers: what each platform takes from every subscription transaction, and the fixed annual platform cost you pay regardless of subscriber count.

Platform Annual Platform Cost Fee Per $1,500 Sub You Keep Per Sub Revenue Share
Personify $348/year ($29/mo) ~$43 (Stripe only) ~$1,457 0%
BuddyPro $2,364/year ($197/mo) ~$240 AI usage/yr ~$1,260 0%
Coachvox $996/year ($83/mo) ~$194 (10% + Stripe) ~$1,306 10% + 2.9% Stripe
Delphi AI $948-$3,588/year ~$270 (15% + Stripe) ~$1,230 15% + Stripe

Notes: "You Keep Per Sub" is per-subscription revenue minus per-subscription fees only, before platform cost. BuddyPro's "fee" is AI usage cost (~$15-30/month per subscriber) rather than a revenue share. Delphi monetization availability varies by plan - see details below. Stripe fees are standard 2.9% + $0.30 per transaction.

The platform cost is a fixed overhead that amortizes across subscribers. The per-subscription fee is what you lose from every single transaction forever. At scale, that distinction becomes significant.

What Does Coachvox Actually Take from Each Subscription?

Coachvox charges a 10% platform fee on every paid-access transaction, plus Stripe's 2.9% processing fee. That's documented on their support site (support.coachvox.ai/article/57, last updated July 29, 2026).

On a $1,500 annual subscription: $150 goes to Coachvox, roughly $44 goes to Stripe. You keep about $1,306 per subscriber - before accounting for the $996/year platform cost spread across your subscriber base.

That 12.9% combined fee rate matters more as you scale. At 20 subscribers charging $1,500/year, Coachvox earns $3,000 from your subscriptions while you pay them $996 to use the platform. You're paying twice - once as a fixed cost, once as a percentage of every dollar you earn.

Coachvox makes sense for lower-price-point models where you're trading margin for volume, or for early testing when you're not sure what price the market will bear. For $1,000-$2,000/year products with a focused expert audience, the math gets expensive quickly.

Delphi's 15% Fee and the Monetization Question

Delphi charges a 15% "Delphi Fee" on creator subscriptions, according to their help documentation (docs.delphi.ai). That's the highest revenue share of the platforms I'm covering here.

On a $1,500 subscription: $225 goes to Delphi, plus roughly $44 in Stripe fees. You keep around $1,231 per subscriber, before platform costs.

Here's where it gets complicated. Delphi's public pricing page (checked August 2026) lists native monetization features primarily under their Immortal custom plan. It's not straightforward whether the Builder plan ($948/year) or Scaler plan ($3,588/year) enables the full subscription billing setup an expert needs. Before committing, get written clarity from Delphi on which plan actually unlocks native paid subscriptions and how their revenue fee is calculated.

Delphi positions well for celebrity and high-visibility influencer use cases. Their infrastructure supports broad reach and media integrations. But the fee economics are the steepest here, which is worth weighing carefully against what you're getting.

Personify's 0% Commission - and What That Means in Practice

Personify claims 0% commission on creator subscriptions, particularly for their Done-For-You builds (documented on personify.fyi as of August 2026). Their Pro plan costs $348/year. That's a compelling combination on paper.

On a $1,500 subscription, you'd pay roughly $44 in Stripe fees and nothing to Personify. You keep around $1,457 per subscriber - the best per-subscription economics of any platform on this list.

The honest caveat: Personify's typical market positioning appears to target lower price points and self-serve use cases. Whether their AI twin quality supports the kind of deep, relationship-forming mentorship that justifies $1,000-$2,000/year subscriptions is worth testing before you launch. You can read about the technology behind what makes AI clones actually convert to understand what quality benchmarks matter at premium prices.

If Personify can execute at the quality level your audience expects, the 0% commission structure is genuinely attractive. The platform cost is low and the per-subscription economics are strong.

BuddyPro: No Revenue Share, Higher Platform Cost

Full transparency on BuddyPro. The platform costs $2,364/year - the highest of the four. There's no voice avatar, no video mode. If those features are essential to your product vision, it's not the right fit.

What BuddyPro doesn't do is take a percentage of your subscriptions. The "fee" you pay per subscriber is the AI usage cost - typically $15 to $30 per subscriber per month, depending on how actively they use it. That averages around $20/month for most subscribers, meaning roughly $240/year in AI usage costs per active subscriber.

On a $1,500 annual subscription: you keep about $1,260 after AI usage costs, before platform overhead. The platform cost of $2,364/year amortizes across your subscriber base, so the economics improve significantly as you add subscribers.

The 0% revenue share becomes meaningful at scale. With 20 subscribers at $1,500/year, you're keeping $25,200 after AI costs on $30,000 revenue. A platform taking 10% would keep $3,000 of that forever - and the gap compounds with every subscriber you add.

Where BuddyPro's numbers actually separate from competitors is retention. The AI twins built on BuddyPro see 60% weekly retention and 80% monthly retention across the platform - meaning subscribers keep coming back and keep paying. That changes the lifetime value math more than any per-transaction fee. You can see a detailed breakdown of how AI coaching platform revenue share models compare at different subscriber volumes.

Which Platform Fits Your Business Model?

The answer depends on two things: your expected subscriber volume and the quality standard your audience will pay premium prices for.

If you're just testing whether the market wants an AI version of you, Coachvox is a lower-risk starting point. The platform cost is manageable and you can get something live quickly. You'll give up margin on every transaction, but you're learning before committing.

If you're an established expert with an existing audience - speakers, authors, coaches with thousands of engaged followers - and you're serious about the $1,000+ annual subscription model, the economics favor platforms without revenue share. Higher upfront cost, but you stop giving a percentage to the platform on every renewal, forever.

Personify offers the best fee structure if quality matches the price point you need. BuddyPro offers the retention data that justifies premium pricing. These aren't mutually exclusive considerations - what your subscribers experience every day determines whether they renew, and renewals are where subscription businesses actually make money.

The practical question: if you acquire 50 subscribers at $1,500/year, how much of that $75,000 annual revenue do you want to keep in year two when you've already covered your launch costs? That math runs very differently on a 10-15% revenue share versus zero.

For a deeper look at how white-label AI twin economics work at scale, see my breakdown of white-label AI coaching platforms and their revenue share structures. And if you're comparing what you keep across different fee models, the AI coaching platform fees comparison covers this in more depth.

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If you want to talk more about the real economics of premium AI subscription products, feel free to catch me on LinkedIn or wherever I'm at in the world at the moment you're reading this, which is usually San Francisco, Prague or Bali.

David Riha · AI Digital Twin Builder · August 26, 2026

Sources: Coachvox platform fee: support.coachvox.ai/article/57 (last updated July 29, 2026). Delphi fee structure: docs.delphi.ai. Personify pricing and commission policy: personify.fyi. BuddyPro pricing and statistics: buddypro.ai.

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