Can I vibe code Stay AI?
stay.ai · subscriptions · $499/mo · subscription
The verdict
KINDA — BUILD THE NICHE VERSION
Stay AI costs $499/mo plus 1% GMV and $0.19 per transaction order. For a store doing $100k/month in subscription sales across 2,500 orders, you are paying $499 + $1,000 + $475 = $1,974 every single month. What do you get for this tax? A wrapper around Shopify's native Selling Plan API, a React customer portal, an A/B testing framework, and an ML model that ranks cancellation save offers (discounts, pauses, swaps). Rebuilding the underlying subscription engine is surprisingly trivial because Shopify's native Subscription Contract API handles the actual billing schedules, vaulting, and order creation. What you are paying Stay AI for is the retention UI layer (cancellation surveys, dynamic swap/skip logic, gamified digital punch cards) and data pipeline. Building an equivalent custom customer portal with automated retention flows takes 2-4 weeks with AI. You save tens of thousands in annual GMV tax, though you lose their pre-built ML churn prediction model and dedicated human onboarding.
- Replaces
- $1,119/mo
- MVP build time
- 2-3 weeks
- Full replacement
- 3-6 months
- Verdict
- KINDA
What it really costs
| Pro Plan | $499/mo | 1% + $0.19 per transaction. All features included. |
| Enterprise | free / quote | Custom development, dedicated strategist, growth planning |
Plus 1% GMV + $0.19 per transaction fee on subscription orders.
- Captured
- 2026-08-04 (3 days ago)
- Verified by
- human
- Source
- stay.ai
Assumptions: Plus 1% GMV + $0.19 per transaction fee on subscription orders.
The one-shot build prompt
You are building a custom Shopify Subscription & AI Retention Engine to replace Stay AI for a Shopify Plus store. DATA MODEL & ENTITIES: 1. SubscriptionContract: ID, shopify_contract_id, customer_id, status (ACTIVE, PAUSED, CANCELLED), next_billing_date, billing_policy (interval, interval_count), delivery_policy, lines (variant_id, quantity, price), payment_method_id. 2. RetentionFlow: ID, name, trigger_event (CANCELLATION_REQUEST, PAUSE_REQUEST), rules (JSON conditions on order_count, total_spent, churn_risk_score), offers (DISCOUNT, SKIP_DELIVERY, SWAP_PRODUCT, GIFT). 3. CancellationAttempt: ID, subscription_contract_id, reason_code, selected_offer_id, outcome (ACCEPTED_SAVED, REJECTED_CANCELLED), calculated_risk_score. 4. DigitalPunchCard: ID, customer_id, current_order_count, reward_milestones (JSON array: order_number, discount_code). CORE WORKFLOWS: 1. CUSTOMER PORTAL (React / Remix App Bridge): - Allow customers to pause, skip next delivery, change delivery frequency, swap variant IDs, or add one-time add-on items (upsells) before charge execution. - Interact directly with Shopify GraphQL Admin API (`subscriptionContractUpdate`, `subscriptionContractPause`, `subscriptionContractResume`). 2. CANCELLATION & WINBACK FLOW ENGINE: - Intercept cancellation button clicks in the customer portal. Render a dynamic retention flow survey. - Calculate churn risk using historical contract age and order frequency. - Evaluate multi-armed bandit algorithm to present the optimal save offer (e.g., "Take 30% off next month" vs "Skip 1 cycle" vs "Swap flavor"). - If user accepts, mutate the `SubscriptionContract` line items or apply a Shopify Price Rule discount code via API. - If user rejects, trigger `subscriptionContractCancel` and emit a webhook to Klaviyo (`Subscription Cancelled` event) with win-back metadata. 3. SMART DUNNING & RECOVERY: - Listen to `subscription_contracts/payment_failure` Shopify webhooks. - Implement exponential backoff retries over 14 days using Shopify's auto-dunning settings. - Send custom Klaviyo SMS/Email payment update links using secure tokenized URLs. INTEGRATIONS: - Shopify GraphQL Admin API (2024-04 version or newer: `sellingPlanGroup`, `subscriptionContract`). - Klaviyo API v3 for event-driven SMS and Email retention messaging. - Recharge / Stay AI CSV importer to parse existing contract logs and map them to Shopify Subscription Contracts. FAILURE MODES & OUT OF SCOPE: - Out of Scope: Native payment gateway token handling (must rely entirely on Shopify Vault). - Out of Scope: Non-Shopify platforms (BigCommerce/WooCommerce support is excluded). - Failure Mode: Out-of-sync inventory during automatic order processing. Engine must catch Shopify inventory errors on contract execution and notify merchant via Slack webhook without canceling the underlying contract. - Plain text output only, no markdown headers deeper than CAPS.
$ each button prefixes agent-specific run instructions · build your own product, never copy proprietary code, trademarks or designs
Scorecard
What you can actually replace
- ✓Customizable drag-and-drop customer portal (swap, skip, pause, delay)
- ✓Cancellation survey flows and retention save offers
- ✓Bundles and build-your-own box UI
- ✓Gamified digital punch cards and loyalty milestones
- ✓One-click add-on upsells inside the customer portal
- ✓A/B testing framework for cancellation offer optimization
What you lose
- ×Proprietary reinforcement-learning models for dynamic retention save offers
- ×Turnkey white-glove migration team to transfer raw contract data from legacy platforms
- ×Dedicated human subscription growth strategist
- ×Pre-configured multi-channel integrations (Attentive, Postscript, Gorgias, Rebuy)
- ×Benchmarked retention analytics compared against industry-wide DTC cohorts
Why people still pay — the real moats
Moats
- — Reinforcement learning models trained across hundreds of DTC subscription brands
- — High-touch, human-led white-glove migration services and dedicated growth strategists
- — Pre-built integrations with e-commerce stack tools (Attentive, Gorgias, Postscript, Klaviyo, Rebuy)
Hard parts
- — Building an online multi-armed bandit algorithm to dynamically weigh and optimize cancellation save offers based on historical conversion rate
- — Synchronizing complex custom bundle state logic with Shopify's native Selling Plan and Line Item architecture
- — Handling high-concurrency billing Webhooks and race conditions when customers pause/modify contracts seconds before scheduled execution
- — Maintaining sync across Shopify Subscription Contracts and external customer portals during high-volume flash sales
- — Handling edge-case billing failures, payment method updates, and complex inventory allocation for bundled subscriptions
- — Managing tokenized payment migrations if switching away from native Shopify Vault/Stripe rails
Build this instead
Headless Subscription Portal Kit
An open-source, self-hosted Shopify App Bridge component that hooks into Shopify's Selling Plan API to provide custom subscription portals without monthly platform fees or GMV cuts.
Plug-and-Play AI Retention Engine
A standalone microservice that hooks into standard subscription webhooks (Recharge, Shopify Subscriptions, Stay AI) and runs reinforcement-learning models to select personalized cancellation offers and auto-optimize A/B tests.
Smart Dunning & Card Recovery Pipeline
An automated dunning and card updater pipeline using Stripe Billing webhooks and Klaviyo SMS/Email flows, bypassing full-suite subscription platforms for brands running custom billing rails.
Prior art — do not start from zero
shopify-app-js (Shopify Subscription App Template) ↗
Shopify's official React template for building native subscription apps using the Selling Plan API.
klaviyo-api-node ↗
Open-source Node.js library for orchestrating Klaviyo event triggers and transactional email/SMS flows.
mab-js ↗
Lightweight reinforcement learning and multi-armed bandit library for Python/Node optimization engines.
Open source alternatives to Stay AI
Self-hostable projects that cover most of the same ground. Free licence, your infrastructure, your on-call.
Have you actually replaced it?
Related products in this category
Appstle orchestrates recurring orders, subscription boxes, and dunning workflows natively on e-commerce platforms like Shopify, replacing basic billing logic with customizable customer portals and checkout extensions.
$10/mo
Subbyx is a subscription management platform for Shopify merchants that automates recurring orders, customer portal management, and subscriber retention flows.
$49/mo
Orchestrates recurring orders, customer portal swaps, dynamic discounts, and dunning cycles through native e-commerce APIs like Shopify Subscription Contracts.
$25/mo
FAQ
+Can I really replace Stay AI with an AI-generated app?
KINDA — THE CORE PORTAL IS EASY, THE AI RETENTION ENGINE TAKES EFFORT. You can replace Stay AI's core subscription portal, skip/swap logic, and basic cancellation flows with an AI-generated app in a couple of weeks. However, matching their automated reinforcement-learning save flows, churn prediction models, and zero-touch migration services requires serious custom ML data engineering and ongoing operations. An MVP takes roughly 2-3 weeks; matching the product properly is closer to 3-6 months.
+How long does it take to rebuild Stay AI?
A usable internal version: 2-3 weeks. A version you would sell or bet a business on: 3-6 months, mostly spent on building an online multi-armed bandit algorithm to dynamically weigh and optimize cancellation save offers based on historical conversion rate.
+What do you actually lose by leaving Stay AI?
Proprietary reinforcement-learning models for dynamic retention save offers Turnkey white-glove migration team to transfer raw contract data from legacy platforms Dedicated human subscription growth strategist
+Is it legal to build a Stay AI alternative?
Building a competing product with your own code is normal competition. Copying their code, trademarks, brand assets or scraping their platform is not. Use the prompt to build your own implementation of common features.
Written by Andrea Saccà — 18 years in the Magento ecosystem. Last reviewed 2026-08-04.
Scores are computed, not typed. Read the methodology.
One e-commerce SaaS teardown every week.
Honest verdicts, build prompts and overlooked vertical SaaS opportunities. No tracking pixels, no drip sequence, unsubscribe in one click.
free forever · no third-party tracking · the prompts stay public