The verdict in three sentences
A custom inventory management app costs between 25,000 and 65,000 EUR excl. tax in 2026 depending on multi-warehouse support, barcode scanning and FIFO/WAC valuation. ROI doesn't come from the software but from cutting stockouts (30 to 50%) and reducing tied-up overstock. Against per-user, per-warehouse market solutions, custom becomes profitable as soon as you run several warehouses with specific valuation rules.
How much an inventory app costs in 2026
Price depends on the number of warehouses, input mode (scanning) and accounting integrations.
| App scope | 2026 price (EUR excl. tax) | Timeline |
|---|---|---|
| Single-warehouse + in/out | 25,000 - 35,000 | 3 months |
| + Barcode scanning + reorder alerts | 35,000 - 48,000 | 4 months |
| + Multi-warehouse + FIFO/WAC valuation | 48,000 - 65,000 | 5 months |
| Accounting/ERP integration | + 8,000 - 15,000 | + 1 month |
| Annual maintenance | 15 - 20% of project | recurring |
Reorder alerts and valuation are the core value: they avoid both stockouts (lost sales) and overstock (tied-up cash).
Off-the-shelf vs custom app
| Criterion | Off-the-shelf SaaS | Custom app |
|---|---|---|
| Upfront cost | 0 - 6,000 EUR | 25,000 - 65,000 EUR |
| Cost per user/month | 25 - 50 EUR | 0 (proprietary license) |
| 3-year cost (10 users) | 9,000 - 18,000 EUR | 25,000 - 65,000 EUR + maintenance |
| Multi-warehouse | Often a paid add-on | Native |
| FIFO/WAC valuation | Standard | Your exact rules |
| Barcode scanning | Yes | Yes + scanner/mobile |
| Local accounting integration | Variable | Native |
For 10 users, off-the-shelf SaaS costs 3,000 to 6,000 EUR/year. The real economic stake lies elsewhere: the cost of stockouts and overstock, often far above the software price.
Mini case study
Karim, logistics director of a spare-parts distributor running 3 warehouses, suffers an 8% stockout rate on 4,000,000 EUR/year revenue. Each stockout loses a sale: the margin shortfall (25%) is estimated at 80,000 EUR/year. In parallel, he ties up 300,000 EUR of overstock.
He invests 55,000 EUR excl. tax in a custom multi-warehouse app with scanning, reorder alerts and WAC valuation, plus 10,000 EUR annual maintenance. The app cuts stockouts by 40% (margin gain 32,000 EUR/year) and overstock by 25% (75,000 EUR of freed cash). The project pays back in about 12 months, freed cash not included.
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FAQ
Is barcode scanning essential?
Yes as soon as the item volume is significant: it divides inventory time by 3 to 5 and makes in/out reliable, removing manual entry errors.
What's the difference between FIFO and WAC?
FIFO values outflows at the cost of oldest inflows; WAC smooths at the weighted average cost. The choice impacts accounting and reported margin; a custom app applies your exact rule.
How much are stockouts reduced?
On average 30 to 50% thanks to reorder alerts based on thresholds and real consumption, which directly recovers sales.
Can multiple warehouses be managed?
Yes, a major strength of custom: per-warehouse tracking, inter-warehouse transfers and consolidated valuation, often a paid add-on with SaaS.
Does the app connect to accounting?
Yes, via API. Budget 8,000 to 15,000 EUR for an accounting/ERP integration that automates valuation and inventory entries.
Let's scope your project. Tell us the number of warehouses, your item volume and your valuation rule (FIFO/WAC) for an indicative budget. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
