Custom ERP vs Odoo vs ERPNext vs Tally: which for Indian SMEs?

Most Indian SMEs should keep Tally for accounting and GST and choose an ERP for operations: Odoo for a broad, polished suite, with Enterprise for advanced features; ERPNext for open-source ownership and strong manufacturing and stock control at low licence cost; and a custom ERP only when the process is unusual enough that standard software would force costly workarounds. Decide by how well each fits your core process in a demo on your own data.

What does an ERP actually cover?

An ERP (enterprise resource planning system) is one shared database and set of workflows that runs a company’s core operations, so sales, purchase, stock, production and accounts all work from the same numbers. Typical modules:

• Accounting and tax: ledgers, GST, TDS, bank reconciliation, e-invoicing and e-way bills.
• Sales and CRM: quotations, sales orders, price lists, schemes, credit limits.
• Purchase: requisitions, purchase orders, goods receipt, vendor bills, approvals.
• Inventory: multiple warehouses, batches, expiry dates, serial numbers, stock transfers, reorder levels.
• Manufacturing: bills of materials, work orders, job work and subcontracting, quality checks, production planning.
• HR and payroll, projects and timesheets, point of sale, and reporting across all of the above.

Accounting software records what happened; an ERP also controls how it happens, with approvals, stock reservations and production steps. That distinction is the key to where Tally fits.

How do Tally, Odoo, ERPNext and a custom ERP compare?

Tally is the accounting and GST standard, Odoo is the most polished broad suite, ERPNext is the strongest fully open-source option for manufacturing and distribution, and custom ERP fits unusual processes. Side by side:

Timelines assume a clear scope and a committed internal owner; multi-entity groups and plants with complex production take longer. Licence terms and edition features change, so confirm current details with the vendor.

Where does Tally fit, and should you keep it?

Tally is best treated as your accounting and compliance system, and most SMEs that adopt an ERP keep it, at least for the first year. TallyPrime handles GST returns, e-invoicing, e-way bills, TDS and statutory reports well, and almost every Indian chartered accountant knows it. Its limits show in operations: multi-step approvals, production planning, multi-location warehouse control, field sales apps, mobile access for large teams and integrations with Shopify or marketplaces all need add-ons or customisation through TDL.

Three common patterns:

1. Tally only, for traders and small manufacturers with simple operations and a few users.
2. ERP for operations, Tally for books. Sales, purchase, stock and production run in the ERP; invoices and vouchers sync to Tally daily through its XML interface or a connector, and the CA continues to file from Tally.
3. ERP for everything, once the team and the CA are confident in the ERP’s GST output, with Tally kept read-only for history.

E-invoicing applies above a turnover threshold (₹5 crore aggregate turnover at the time of writing), so whichever system issues invoices must generate the IRN correctly.

What is the difference between Odoo Community and Odoo Enterprise?

Odoo Community is the free, open-source core, while Odoo Enterprise adds features, hosting options, mobile apps, upgrade support and the Studio customisation tool under a per-user subscription. Odoo is built as a set of connected apps (accounting, sales, CRM, inventory, manufacturing, purchase, point of sale, HR, website, ecommerce) that share one database, and its interface is among the most polished in the category.

For an Indian SME, the practical questions are which features you need sit only in Enterprise (several accounting, manufacturing and India compliance features do in some versions), whether you will host on Odoo Online, Odoo.sh or your own server, and how much custom code you will add. Custom modules must be updated when you move to a new Odoo version, which is the hidden cost in heavily customised projects. Odoo has a large partner ecosystem in India, so implementation quality varies widely; judge partners by the industry references they can show.

What is ERPNext, and who is it for?

ERPNext is a fully open-source ERP, released under the GPL by Frappe Technologies in Mumbai and built on the Frappe framework, with every module free to use. It covers accounting, buying, selling, stock, manufacturing, projects, quality and point of sale, and companion apps add HR and payroll (Frappe HR) and Indian GST compliance, including e-invoicing, e-way bills and return reconciliation, through the open-source India Compliance app.

Its strengths are manufacturing and distribution: multi-level bills of materials, work orders, job cards, subcontracting, batch and serial tracking, and multi-warehouse stock. The Frappe framework makes custom fields, forms, reports and whole custom apps quick to build without forking the core, which keeps upgrades manageable. You can host it on Frappe Cloud or your own server. The trade-offs: some screens are less refined than Odoo’s, and the partner ecosystem is smaller, so check your implementer’s depth. For businesses that want ownership, Indian compliance and low licence cost, it is often the strongest choice.

When does a custom ERP make sense?

A custom ERP makes sense when your core process is genuinely different from what standard ERPs model, and forcing it into one would cost more in workarounds than building. Examples include textile and diamond businesses with long job-work chains across many karigars, made-to-order manufacturers with complex product configurators, rental and subscription businesses, and distributors with unusual scheme and claim logic.

Often the right answer is a hybrid: a standard ERP for accounting, stock and purchase, plus a custom app for the one process that makes you different, such as a shop-floor tracking app or a dealer portal. Building custom apps on the Frappe framework alongside ERPNext is a common way to get both. If you go fully custom, insist on owning the code, documentation and hosting accounts, and budget for ongoing maintenance. Our ERP development and custom software development teams scope exactly this question before recommending a build.

Which ERP should you choose for your type of business?

Choose by the process that drives your margin. These decision rules hold for most Indian SMEs:

• Manufacturer: ERPNext or Odoo with manufacturing, chosen on how each handles your BOMs, job work and quality checks in a demo on your own data. Keep Tally for books initially. Go custom only for engineer-to-order or job-work chains neither can model.
• Distributor or wholesaler: ERPNext or Odoo with strong credit limits, schemes, multi-godown stock and a salesman ordering app. Very small distributors can stay on Tally with a field-sales add-on.
• FMCG or packaged-food brand: an ERP with batch and expiry tracking and integrations to Shopify, Amazon, Flipkart, quick-commerce purchase orders and distributors. Channel integration is usually the hardest part; our quick commerce guide covers the PO side.
• Retail chain: Odoo or ERPNext point of sale, or a dedicated retail POS connected to an ERP, with store-to-store transfers and central purchasing.
• Services firm: often no full ERP; projects, timesheets and billing in Odoo or Zoho, with accounts in Tally or Zoho Books.
• D2C brand selling mainly on Shopify: usually Shopify, an order and inventory management tool and Tally are enough until you manufacture in-house or run several warehouses and channels. Our D2C growth guide covers what to fix first.

If two options both fit, prefer the one your team found easier to use in the demo; adoption beats features.

Questions to ask in every ERP demo

1. Show our own top five items, from purchase to production to sale to GST invoice, using our data.
2. How does the system handle our hardest case, such as job work, schemes, batch expiry or returns?
3. What is standard, what is configuration and what is custom code?
4. Who will support us after go-live, and how quickly do they respond?
5. What happens to our customisations at the next version upgrade?
6. Can we export all our data at any time, in a usable format?

How do you implement an ERP, and how long does it take?

An SME ERP implementation usually takes two to six months from process mapping to go-live, and it follows the same steps whichever platform you choose:

1. Map processes as they are and as they should be, department by department, with the people who do the work.
2. Run a fit-gap with a demo on your own items, customers and scenarios, not the vendor’s sample data.
3. Design masters: chart of accounts, item codes, units, warehouses, naming series, approval rules.
4. Migrate data in trial rounds (see below).
5. Configure, then customise sparingly. Change the process before changing the software.
6. Build integrations with Tally, Shopify, marketplaces and WhatsApp.
7. Test with real scenarios end to end, from order to invoice to payment.
8. Train by role, with short guides in the language each team works in.
9. Go live at a clean cut-off, ideally the start of a month or the financial year on 1 April, with a short parallel run.
10. Support closely for four to six weeks, then plan phase two.

Data migration

Migrate masters (items with HSN codes and units, customers and vendors with GSTINs, BOMs, price lists), opening balances, open orders and current stock by batch and location. Leave years of transaction history in Tally or the old system as read-only. Clean before you move: merge duplicates, fix units of measure and correct GSTINs. Run at least two trial migrations, and have your accountant sign off ledger and stock reconciliation before go-live.

What drives ERP cost, and why do ERP projects fail?

Cost drivers

ERP cost is driven by scope and change, not just licences. The main factors are the number of users and the licence model, the modules in scope, how much customisation you insist on, the number of integrations, data migration effort, hosting, training and the annual support or maintenance contract. Version upgrades add cost when there is heavy custom code. Ask every vendor to price these lines separately so proposals can be compared.

Why ERP projects fail, and how to avoid it

How should an ERP integrate with Shopify, marketplaces and WhatsApp?

The ERP should be the single record of stock and invoices, with every sales channel feeding orders in and receiving stock levels back automatically. In practice:

• Shopify: orders, customers and payments flow into the ERP; stock levels and prices flow back. Connectors exist for both Odoo and ERPNext, some official and many third-party; test them on returns, partial fulfilment, COD remittance and discounts before trusting them. A clean Shopify set-up makes this far easier.
• Marketplaces: Amazon and Flipkart through their seller APIs or an order management tool such as Unicommerce or EasyEcom between the channels and the ERP. Settlement reconciliation, matching payouts to orders, fees and returns, is where most of the value lies.
• Quick commerce: brands supplying Blinkit, Zepto or Swiggy Instamart mostly work through purchase orders and portal reports, so automate PO capture, invoicing and dispatch paperwork.
• WhatsApp: order confirmations, dispatch updates, payment reminders and approval requests for managers, sent from the ERP through the WhatsApp Business API. An AI chatbot on top can let dealers check stock, prices or order status themselves.

These integrations are usually built with workflow automation tools or custom code, and AI can take on reading supplier invoices and drafting purchase orders, as described in our guide to AI agents for business and delivered through AI agent development. gaa-tha’s ERP development work covers choosing the platform, implementation and these integrations, with dashboards and internal tools under business tools and automation.

Frequently asked questions