424 Inventory Sync vs Safety Buffer
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 14, 2026 for 424 Inventory Sync, Oct 13, 2026 for Safety Buffer.
The short answer
- Only Safety Buffer lists a free plan. Paid plans start at $4.99/month for 424 Inventory Sync and $14.99/month for Safety Buffer.
- 424 Inventory Sync lists 3 features Safety Buffer’s listing doesn’t mention, including Inventory sync, SKUs, Workflow automation.
Head to head
Basic
- · Auto-sync by SKU across products/variant
- · Real-time updates on sales and manual ed
- · “Sync now” button plus a list of duplica
FREE
- · 1 active rule
- · 1 location per rule
- · Sync up to 5,000 unique products/day
- · Unlimited DryRuns
- · Up to 2 collections per rule
- · Up to 5 manual syncs/day
LITE
- · 5 active rules
- · Auto sync every 2 hours
- · Sync up to 20,000 unique products/day
- · Unlimited DryRuns
- · Up to 10 collections per rule
- · Up to 5 locations per rule
STARTER
- · 10 active rules
- · Auto sync every 1 hour
- · Sync up to 50,000 unique products/day
- · Unlimited DryRuns
- · Up to 10 locations per rule
- · Up to 100 manual syncs/day
PRO
- · 20 active rules
- · Auto sync every 15 minutes
- · Sync up to 200,000 unique products/day
- · Unlimited DryRuns
- · Up to 200 manual syncs/day
- · Up to 200 product exclusions
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every feature424 Inventory Sync keeps stock levels consistent across products and variants that share a SKU. When inventory changes from sales or edits, it mirrors available quantity per location to all matches—automatically. It’s lightweight and focused (no bells and whistles) with a manual “Sync now” fallback.
Manage inventory risk by creating automated safety stock buffers that protect your brand from overselling. Our app moves a portion of your inventory into a reserved state, ensuring you never sell your last few units during high-traffic flash sales or across multiple channels like TikTok and POS. Use built-in simulation tools to dry run your rules before they go live, eliminating guesswork.
- Auto-sync by SKU across products/variants per location
- Real-time updates on sales and manual edits
- “Sync now” button plus a list of grouped SKUs
- Set flat or percentage-based inventory reserves across collections and locations
- Run unlimited dry runs to verify stock adjustments before they go live.
- Prevent overselling on high-velocity channels like TikTok Shop and Shopify POS.
- Apply specific rules to locations or collections with custom min/max limits.
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  424 Inventory Sync |  Safety Buffer |
|---|---|---|
| Detected stores | Not published | Not published |
| Net store change, 28 days | 0 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Not published |
| Top store countries | Not published | Not published |
Reviews
| Measure | 424 Inventory Sync | Safety Buffer |
|---|---|---|
| App Store rating | 5.0 ★ | Not published |
| App Store reviews | 1 | Not published |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | 424 Inventory Sync | Safety Buffer |
|---|---|---|
| Free plan | Not listed | Yes |
| Lowest paid monthly plan | $4.99/month(ahead) | $14.99/month |
| Longest free trial | 7 days | Not listed |
| Plans listed | 1 | 4 |
Listing
| Measure | 424 Inventory Sync | Safety Buffer |
|---|---|---|
| Shopify category rank | #180 | #126(ahead) |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Aug 22, 2025 | May 19, 2026 |
| Languages | 1 | 1 |
| Developer | 424 Solutions LLC | bbtools |
FAQ
424 Inventory Sync and Safety Buffer: common questions
- Is 424 Inventory Sync or Safety Buffer cheaper?
- Only Safety Buffer lists a free plan. Paid plans start at $4.99/month for 424 Inventory Sync and $14.99/month for Safety Buffer. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- What features does each app list that the other doesn’t?
- 424 Inventory Sync lists 3 the others don’t mention, such as Inventory sync, SKUs, Workflow automation. Safety Buffer lists 1 the others don’t mention, such as Inventory planning. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Oct 14, 2026 for 424 Inventory Sync, Oct 13, 2026 for Safety Buffer; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Oct 14, 2026 for 424 Inventory Sync, Oct 13, 2026 for Safety Buffer. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.