Build vs buy an ERP in India: which is right for you?
Three realistic paths exist: build a custom ERP, buy a packaged or SaaS product, or start from a ready-made system and customise it. Here is how to choose. We compare cost, time, compliance and control, and say when each option wins.
- Build
- Buy
- Ready-made
Free 30-minute consultation. An honest recommendation, even if it is not us.
- Build customFits a unique process, takes longest
- Buy packaged or SaaSFast to start, fees grow with users
- Ready-made, customisedLive in weeks at a fixed rupee price
- Ask five questionsTo find your best fit
Should you build or buy an ERP in India?
Build a custom ERP only when your core process is genuinely unique and a source of competitive advantage. Buy a packaged or SaaS ERP when your processes are standard and you accept the vendor’s roadmap and per-user fees. Start from a ready-made system, such as Stack18 Business OS, when you need Indian compliance (GST, e-invoicing, e-way bills) and mostly standard processes with a few of your own, live in 3 to 12 weeks at a one-time rupee price.
The options compared.
| Build custom | Buy packaged or SaaS | Ready-made, customised (Stack18 Business OS) | |
|---|---|---|---|
| Upfront cost | Often ₹5–20 lakh or more | Low to start | Editions from ₹2.8L, one-time, excluding GST |
| Time to go live | 3–6 months or more | Days to weeks | 3–4 weeks (Launch), 6–8 (Grow), 10–12 (Scale) |
| Per-user fees | None | Grow with every user, every year | None |
| Indian compliance | Built from scratch each time | Varies, often via add-ons | GST, e-invoicing, e-way bill, TDS and UPI built in |
| Changing it later | Yours to change, at full cost | Limited to the vendor roadmap | Customize any module on the Agentic SDLC |
| Where it runs | Wherever you decide | Usually vendor-hosted | Your own cloud account or servers, not a shared multi-tenant system |
| Moving off Tally | You build the migration | Varies by product | Tally Migration and Sync included in the Launch edition |
Where each option wins.
There is no universally best answer. This is where each path is genuinely the right one.
Build
- Best when
- Your core process is genuinely unique and a source of competitive advantage, and you can maintain the system for years.
- Trade-off
- Highest cost and longest timeline, and you carry delivery and maintenance risk.
- Typical result
- Often ₹5–20 lakh or more and 3–6 months or more, with no per-user fees.
Buy
- Best when
- Your processes are standard, your user count is small and you want to start within days.
- Trade-off
- Fees grow with every user every year, changes are limited to the vendor roadmap and Indian compliance often comes through add-ons.
- Typical result
- Low to start, and live in days to weeks.
Ready-made
- Best when
- You are an Indian SME or mid-market business moving off Tally and Excel, with mostly standard processes and a few that are your own.
- Trade-off
- Modules cover common flows, so anything beyond a module’s scope is estimated separately.
- Typical result
- Business OS editions from ₹2.8L, live in 3 to 12 weeks, with no per-user fees.
Which path fits your business?
Answer honestly. The pattern across your answers points to your best path.
Is the process your edge?
If your core workflow is what customers pay you for, lean towards a custom build.
How many users in three years?
Per-user fees compound with headcount. More users favour ownership or no-per-user pricing.
How soon must you go live?
Days points to packaged SaaS. Weeks points to ready-made. Months or more leaves room for custom.
How heavy is your compliance load?
GST, e-invoicing, e-way bills and TDS come built in with ready-made Indian systems. A custom build starts from scratch.
Who will maintain it?
With no in-house team, choose a vendor-maintained option or a ready-made system with the optional Care plan, from 15% of build value per year.
When Stack18 is, and is not, the right choice.
Stack18 Business OS suits Indian businesses moving off Tally and Excel who want one ERP with a fixed rupee price and no per-user fees. If your process is so unusual that no module fits, we will say so and scope a custom build instead. If you only need a handful of users on a standard product, a packaged SaaS may genuinely cost less.
Common questions.
How much does it cost to build a custom ERP in India?
Typical Indian agency quotes for comparable scope are often ₹5–20 lakh or more, and projects often take 3–6 months or more. Stack18 fixes the price after a short discovery so you know before you commit.
How long does a ready-made ERP take to implement?
For Stack18 Business OS, the Launch edition typically goes live in 3 to 4 weeks, Grow in 6 to 8 weeks and Scale in 10 to 12 weeks, depending on modules and integrations.
Is a ready-made ERP GST-ready?
Yes. Business OS includes GST accounting, e-invoicing with IRN and QR, e-way bills and TDS, with GSTR-ready reports.
Can we migrate from Tally?
Yes. Business OS includes Tally Migration and Sync, which brings masters, opening balances and history across, with ongoing sync if your CA prefers to keep filing from Tally.
Do we pay per user?
No. Stack18 solutions have no licence or per-user fees. You pay for cloud hosting on your own account and any third-party usage such as WhatsApp or payment gateway charges.
Can a ready-made ERP be customised?
Fully. You get production-ready modules on day one, and Stack18 can change workflows, screens and integrations to fit how you work, using the Agentic SDLC platform.
Related guides and pages.
Ready-made vs custom software
The broader question beyond ERP.
Read →SolutionBusiness OS
GST-ready ERP from ₹2.8L, live in 3 to 12 weeks.
Read →PricingHow we price
Edition prices, inclusions and what is paid separately.
Read →IndustryManufacturing
Procure-to-dispatch visibility on one system.
Read →Not sure which fits? Ask us.
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