Mst: Wishlist + Marketing Flow vs. Sirius Wish: An In-Depth Comparison

Introduction

Choosing the right wishlist app is a deceptively important decision for Shopify merchants. A wishlist is more than a convenience feature; it captures purchase intent, fuels remarketing flows, and provides signals that can increase conversion rates and lifetime value. With many options available, merchants must weigh functionality, integrations, scalability, and long-term value.

Short answer: Mst: Wishlist + Marketing flow is a strong, focused wishlist tool with deep customization, headless support, and proven user satisfaction (150 reviews, 4.7 rating). Sirius Wish presents a tiered, usage-based model that can scale with traffic but currently lacks visible social proof (0 reviews). For merchants wanting a single, reliable wishlist with rich customization, Mst is a safe pick; for teams that prefer a usage-tier model and simple out-of-the-box setup, Sirius Walks into consideration—but both can create tool sprawl. For merchants who prefer an integrated retention stack that combines wishlist capability with loyalty, referrals, and reviews, an all-in-one solution like Growave is often the higher-value choice.

This article provides a practical, feature-by-feature comparison of Mst: Wishlist + Marketing flow and Sirius Wish to help merchants choose the right tool for their needs. After the direct comparison, the piece explains why consolidating retention tools into a single platform can reduce friction and improve long-term results.

Mst: Wishlist + Marketing flow vs. Sirius Wish: At a Glance

Deep Dive Comparison

Core Feature Set

Wishlist capabilities and user experience

Mst: Wishlist + Marketing flow delivers a wide range of wishlist features that cover most merchant needs out of the box. Key capabilities include multiple wishlists per customer, guest wishlist support, unlimited items and customers, and a fully customizable My Wishlist page that accepts Liquid, HTML, and CSS changes. The app also emphasizes responsive design for both desktop and mobile.

Sirius Wish positions itself as an intuitive wishlist builder focused on ease of use and conversion. It highlights wishlist creation, basic management (add/remove), and behavioral benefits such as reducing cart abandonment. The core UX appears straightforward, but public documentation of advanced UI options is limited.

What this means for merchants:

• Stores that need multiple distinct lists per customer (wishlists for events, gifting, favorites) will find Mst better suited.
• Stores that want a minimal, consumer-friendly wishlist with a simple interface can expect Sirius to cover basic needs—assuming the app's UX matches its description.

Notifications and purchase intent signals

Mst includes price-drop and back-in-stock alerts with delivery via email, SMS, and push—an important capability for converting wishlist interest into purchases. These events serve as strong intent signals and can be used to trigger targeted campaigns in connected email/SMS platforms.

Sirius Wish mentions reducing cart abandonment and gathering preferences but does not publish a detailed list of alert channels or automation triggers in the provided data. The absence of documented integrations or push channels suggests that advanced alert automation may require custom work or additional apps.

Practical takeaway:

• If automated alerts and cross-channel reminders are central to the wishlist strategy, Mst offers built-in options that will reduce implementation effort.
• If only basic “save for later” behavior is required, Sirius may suffice; however, merchants relying on automated re-engagement will want to confirm available channels before committing.

Customization and developer support

Mst advertises extensive customization: multiple UI options, a customizable My Wishlist page, Liquid template access, and API/headless theme support. That makes it a fit for stores that require a branded wishlist experience or have headless architectures.

Sirius emphasizes ease of integration but does not list headless or API support in the supplied description. For merchants with custom themes or headless setups, Mst’s explicit headless and API features are an advantage.

Considerations:

• Merchants with unique storefronts, complex UX requirements, or who use a headless approach should prioritize apps that support Liquid/HTML customization and expose an API—Mst fits that bill.
• For merchants using standard Shopify themes and preferring minimal customization, Sirius might be adequate provided it integrates well with the store.

Data capture and analytics

Mst’s feature list implies access to event-based signals (price drop, back-in-stock) that are actionable. It lists integration partners (Klaviyo, Brevo) which suggests the ability to forward data to analytics and marketing platforms for segmentation and automation.

Sirius claims to provide insights into customer preferences, but concrete details are scarce in the available information. The tiered pricing focuses on sessions and wishlist actions rather than analytics depth.

Merchants should:

• Verify with Sirius what analytical outputs and export options are available.
• Expect Mst to be easier to connect to existing analytics and lifecycle marketing systems due to its listed integrations.

Pricing and Perceived Value

Pricing models

Mst: Offers a single Monthly plan at $2/month with unlimited wishlist items and customers and “one fixed cost for all features.” This predictable, flat pricing communicates simple value: full functionality for a very low recurring price.

Sirius Wish: Uses a freemium-to-premium structure with session and wishlist action limits:

• Free: 6000 Sessions, 100 Wishlist Actions
• Starter $14.99/month: 12,000 Sessions, 1500 Wishlist Actions
• Pro $49.99/month: 60,000 Sessions, 15,000 Wishlist Actions
• Premium $89.99/month: 110,000 Sessions, 60,000 Wishlist Actions

Sirius’ approach scales with usage but introduces the risk of hitting limits (sessions, actions) and needing to upgrade. That model can be economical for stores with predictable volumes but may become complex during traffic spikes (promotions, holidays).

Value for money

Mst’s flat $2/month plan represents clear value for merchants who want unlimited wishlist actions and no surprise bills. That simplicity is attractive for small to medium stores.

Sirius can be better value for stores that will remain within the free or low-tier limits and prefer a more managed approach. However, merchants with variable or growing traffic need to model expected sessions and wishlist actions to avoid unanticipated upgrades.

Advice for merchants:

• Forecast wishlist actions (saves, visits) for promotional periods and peak seasons before choosing a usage-tiered product like Sirius.
• If cost predictability and unlimited actions matter, Mst offers better value for money.

Integrations and Ecosystem Fit

Native integrations

Mst lists direct integrations with platforms merchants commonly use for lifecycle marketing and mobile experiences, including Klaviyo for email and SMS, Brevo/PushOwl for push, and Apploy for mobile app builders. It also supports Shopify Flow and customer accounts. These integrations reduce the friction of wiring wishlist events into existing marketing automations.

Sirius did not list integrations in the provided data. Absence of published connectors can mean extra integration work via middleware or custom code to forward wishlist events to email/SMS platforms.

Why integrations matter:

• Wishlist events become meaningful when they feed into lifecycle campaigns: back-in-stock alerts, price-drop emails, and abandoned-cart mitigation. Apps that connect directly to popular ESPs reduce the technical burden.
• Stores that rely heavily on third-party tools should confirm integration availability and how data is formatted.

Headless, multi-language, and multi-currency support

Mst explicitly supports API and headless themes, multi-language and multiple currencies—important for international merchants and advanced storefront architectures. That readiness accelerates deployment across markets.

Sirius does not list these capabilities in the available data. International stores will need confirmation of localization and currency handling.

Support, Reliability, and Social Proof

Ratings and reviews

Public social proof is often a proxy for product maturity and support consistency. Mst shows 150 reviews and a 4.7 rating, which signals a wide install base and generally positive merchant experiences.

Sirius currently has zero reviews and a zero rating in the provided dataset. That may indicate a new app or limited adoption. The lack of user feedback introduces uncertainty around long-term reliability, edge-case handling, and support responsiveness.

Merchant guidance:

• A well-reviewed app (Mst) usually suggests mature development, bug fixes, and active support. Still, reviews should be read for patterns (e.g., complaints about theme conflicts).
• For apps without public reviews, request references, ask about uptime SLAs, and run a short pilot before committing to significant reliance.

Support channels and SLAs

Mst’s ecosystem fit implies vendor familiarity with marketing integrations and Shopify Flow, but details about support hours and channels (live chat, email, phone) should be confirmed on the app listing.

Sirius’ support availability is not listed. Merchants should verify response times, support scope (implementation vs. troubleshooting), and whether the vendor will help with customization.

Scalability and Operational Concerns

Performance under load

Sirius’ session/action caps tie the app’s cost directly to traffic and wishlist interaction volumes. This model can be predictable when traffic is stable but costly during spikes.

Mst’s unlimited model removes per-action throttling concerns. For growth-phase merchants or high-traffic sites, an unlimited approach reduces the chance of sudden feature throttling.

Developer and theme conflicts

Mst’s support for Liquid and custom templates reduces theme conflict risk: developers can integrate the wishlist as a native-looking feature. Because Mst advertises headless and API options, it’s more flexible with advanced architectures.

Sirius’ lack of public customization options increases the chance merchants will need developer time to match the look and behavior of their storefront.

Security, Data Ownership, and Compliance

Both apps must comply with Shopify’s app requirements and data handling policies. The provided data does not include detailed privacy or data retention policies. Merchants should verify:

• Where wishlist data is stored and whether it can be exported.
• How personal data used for notifications is handled and whether GDPR/CCPA controls exist.
• Whether integrations send data securely to ESPs or analytics platforms.

Best practice:

• Request a data flow diagram and retention policy from any wishlist provider before full deployment.

Pros and Cons — Concise Lists

Mst: Wishlist + Marketing flow

Pros

• Rich customization (Liquid, HTML, CSS) and headless/API support.
• Multiple wishlists and guest wishlist support.
• Price-drop and back-in-stock alerts via email, SMS, and push.
• Simple flat pricing with unlimited items and customers.
• Proven social proof (150 reviews, 4.7 rating).

Cons

• Single-purpose app—not bundled with loyalty, referrals, or reviews.
• May require developer work to fully brand the wishlist page for some stores.

Sirius Wish

Pros

• Freemium tier for small stores to test basic wishlist functionality.
• Tiered plans allow scaling with sessions and actions.
• Positioned as a simple, intuitive wishlist for merchants seeking low setup friction.

Cons

• No public reviews or rating; limited social proof.
• Session/action caps can lead to unexpected upgrades.
• Integrations and advanced customization details are not clearly published.

Which Merchants Should Choose Each App?

Mst: Ideal for merchants who:

• Want deep control over the wishlist UI and behavior.
• Use headless architectures or require API access.
• Need unlimited items and customers without billing surprises.
• Want built-in alerts that integrate with email/SMS/push workflows.

Sirius Wish: Best for merchants who:

• Are testing wishlist functionality on low traffic stores and prefer a free or low-cost starter plan.
• Prefer a simple, managed wishlist without immediate need for advanced customizations.
• Can comfortably forecast sessions and wishlist actions to match a usage-tiered plan.

Merchants that should pause before choosing either:

• Brands that need a broad retention stack (loyalty, referrals, reviews) will likely end up installing multiple apps, increasing maintenance and integration overhead.
• High-growth stores with unpredictable traffic spikes should carefully model Sirius’ caps and consider unlimited or integrated options.

Implementation Tips for Wishlist Success

• Treat wishlists as behavioral signals: feed wishlist events into email and SMS automations to trigger price-drop and back-in-stock messages.
• Offer social sharing from the wishlist to create referral pathways and social proof.
• Use guest wishlist functionality to capture intent from non-logged-in shoppers, then follow up with incentives to create an account.
• Avoid tool sprawl: match the wishlist choice to broader retention strategy—if loyalty and reviews are expected downstream, plan how data will flow between apps.
• Test across devices: mobile is the dominant traffic source for many stores; ensure the wishlist implementation is mobile-optimized.

The Alternative: Solving App Fatigue with an All-in-One Platform

App fatigue and its real costs

Shopify stores often start with a handful of specialized apps—wishlist, loyalty, reviews, referrals—each selected to solve a specific pain point. Over time, the app ecosystem can become a maintenance burden:

• Multiple billing lines increase operating complexity.
• Integration gaps create fragile data flows; wishlist events might not reach the loyalty program without middleware.
• Conflicting scripts can slow storefront performance and cause theme issues.
• Support coordination multiplies: when a wishlist event doesn't trigger a reward, merchants must triage across multiple vendors.

This phenomenon—commonly called app fatigue—drags on retention, distracts operations teams, and slows growth.

More Growth, Less Stack: Growave’s proposition

Growave positions itself as a unified retention platform that consolidates wishlist functionality with loyalty, referrals, reviews & UGC, and VIP tiers. The value proposition is simple: combine the behavioral signals from a wishlist with loyalty and review workflows inside one platform to increase retention and lifetime value without juggling multiple apps.

Merchants considering consolidation should explore how to:

• Consolidate retention features into a single, maintained integration to reduce friction and bugs.
• Route wishlist intent directly into loyalty actions and personalized email campaigns without separate middleware.
• Leverage built-in review and referral mechanics to amplify the value of wishlist-driven conversions.

To evaluate consolidation, merchants can compare the cost of multiple single-purpose apps to the predictable plan pricing of an integrated platform and the operational time saved by eliminating cross-app wiring.

What Growave includes and how it solves fragmentation

Growave bundles multiple retention capabilities so wishlist signals immediately feed into rewards and review flows.

Key capabilities referenced in Growave’s offering include:

• Loyalty programs and reward mechanics that convert wishlist signals into targeted incentives useful for increasing repeat purchases. Merchants can learn about building loyalty and rewards that drive repeat purchases.
• Built-in reviews and UGC tools to collect and display social proof without integrating a separate review app; see how merchants collect and showcase authentic reviews.
• Wishlist features that tie directly to loyalty and referral campaigns, avoiding the need to sync events across multiple apps.
• Enterprise support for high-growth merchants and Shopify Plus with headless and checkout integrations.

Because Growave integrates wishlist capability with loyalty and reviews, it reduces friction and turns intent into action more reliably than disparate tools.

Integrations and technical fit

Growave lists broad compatibility across checkout, Shopify POS, Shopify Flow, and many marketing platforms. For merchants migrating from single-purpose wishlist apps, two practical benefits stand out:

• Reduced integration points: one platform needs to integrate with email, SMS, and other operational tools rather than multiple isolated apps.
• Native cross-feature automations: wishlist saves can be used as triggers for loyalty point awards, referral nudges, or review requests through one configuration layer.

Merchants evaluating consolidation should check how Growave integrates with their critical systems and review implementation resources for headless or Plus setups. To understand plan differences and how an integrated stack matches the store’s scale, merchants can compare plans and features to determine the right fit for their order volume and support needs via a page that helps merchants consolidate retention features.

Use cases where consolidation accelerates outcomes

• Brands that want to reward wishlist behavior: awarding loyalty points when a customer saves a product encourages future conversion and aids segmentation.
• Stores that want reviews tied to purchases and wishlist interest: review requests can be prioritized for items with high wishlist activity.
• Teams that want fewer vendor relationships: a single vendor reduces support complexity and long-term maintenance.

For merchants ready to evaluate Growave directly, a tailored walkthrough helps clarify how wishlist signals convert into retention mechanics—book a personalized demo to see the unified stack in action.

Why integrated pricing can be more predictable

Integrated platforms often price by plan tiers based on order volume and feature access, rather than per-action caps. For merchants comparing usage-tiered wishlist apps to consolidated platforms, this predictability simplifies budgeting and reduces surprises during growth or promotional spikes.

Merchants can review plan tiers to compare ongoing costs and feature coverage and determine whether consolidation provides net value through fewer integrations and less developer time. For an immediate sense of paid and trial options, merchants can review plans that help compare how features map to business needs and trial availability on the page that helps merchants compare Growave plans and pricing.

Twice-Used Feature Links

To explore how wishlist behavior becomes retention growth in practice, merchants can review resources that explain how to build loyalty and rewards that drive repeat purchases and how to collect and showcase authentic reviews. Both capabilities demonstrate the value of centralizing retention tools to reduce data leaks and speed up time to ROI.

If a full consolidation isn’t feasible

Some merchants will continue to operate with specialized apps due to contract constraints or specific advanced needs. When that’s the case, recommended best practices include:

• Define a small data contract: explicitly document the wishlist events and fields that must be shared with loyalty and email systems.
• Use middleware sparingly: prefer direct integrations where available; use middleware only when absolutely necessary.
• Monitor uptime and performance: track the impact of each app on page speed and consumer metrics.
• Plan migration windows: if consolidating later, centralize data export routines and verify data portability.

Merchants preparing for a migration should consider starting with a free trial or demo to confirm that the consolidated platform supports required workflows and integrations.

Book a personalized demo to see how an integrated retention stack improves conversion and long-term retention.

Conclusion

For merchants choosing between Mst: Wishlist + Marketing flow and Sirius Wish, the decision comes down to customization needs, pricing predictability, and integration depth. Mst is the stronger option for stores that require multiple wishlists, headless/API support, and built-in alert channels—backed by 150 reviews and a 4.7 rating that suggest maturity and reliable support. Sirius Wish offers a tiered pricing model that can suit smaller shops or those who prefer a scaled usage approach, but the lack of public reviews and limited published integration details create uncertainty for merchants with more advanced requirements.

Beyond the single-purpose tradeoffs, there is an important strategic choice: continue assembling best-of-breed single-purpose apps and manage the integration overhead, or move to a single retention platform that reduces complexity and turns wishlist intent into measurable LTV increases. Consolidation into one platform can eliminate tool sprawl, lower the number of integration points, and make retention work more actionable.

For merchants ready to overcome the limits of single-purpose apps and centralize wishlist, loyalty, referrals, and reviews into one predictable platform, Growave offers an integrated alternative with tiered plans and trial options—compare plans that show how features map to order volume and support needs and start evaluating what consolidation looks like for the store by reviewing options to consolidate retention features. Growave’s suite includes built-in loyalty and rewards, review collection, and wishlist behavior that work together to drive repeat purchases and improve customer lifetime value. Merchants can also see how consolidation performs on the Shopify marketplace by visiting one integrated app listing on the App Store to install and test the flow directly: install a single retention app from the Shopify App Store.

Start a 14-day free trial to explore Growave’s integrated retention suite and see how one platform replaces multiple apps and reduces maintenance while improving retention.

FAQ

What are the main functional differences between Mst: Wishlist + Marketing flow and Sirius Wish?

• Mst emphasizes deep customization, headless support, and built-in alerts (price drop, back-in-stock) with unlimited items and customers for a flat monthly fee. Sirius uses session and wishlist action limits with a freemium to premium tiered pricing model and focuses on a simple wishlist experience. Mst has significant social proof (150 reviews, 4.7), while Sirius currently lacks public reviews.

Which app offers better value for growing stores?

• For predictable cost and unlimited actions, Mst presents clear value for money. Sirius may be cost-effective for stores that stay within lower usage tiers, but growth and traffic spikes can force upgrades. Value depends on expected wishlist actions and willingness to manage usage caps.

If integration with Klaviyo or push providers matters, which is the safer choice?

• Mst lists integrations with Klaviyo and push providers, making it easier to trigger lifecycle automations. Sirius does not list integrations in the provided data, so merchants should verify connector availability.

How does an all-in-one platform compare to specialized wishlist apps?

• An integrated platform reduces the number of vendors, eliminates cross-app wiring, and allows wishlist behaviors to feed loyalty and review flows natively. This often reduces development time, lowers the risk of data loss between systems, and improves the ability to run unified retention campaigns. Merchants interested in consolidation can review plan options and try a trial to confirm fit by comparing how a single app replaces multiple tools and simplifies operations via pages that help consolidate retention features and review available integrations on the Shopify App Store listing.