Every calculator, code recipe, and interactive on this site — one page.
Each card jumps you straight to the exact section of the blog post that hosts the tool. Bookmark the ones you use often, share direct links, or filter to just calculators / code recipes / decision explorers.
Featured standalone tools
ERP 3-year TCO calculator
Side-by-side 3-year total cost of ownership for ERPNext vs the proprietary alternatives. Pick your user count and scope; the comparison live-computes. Every number is in the UI for sanity-checking.
Open Resource · 25 questions, 5 categoriesERPNext Implementation Readiness Checklist
Scope, data, change, vendor, budget — 25 questions to ask before signing an ERPNext implementation contract. Vendor-neutral, printable, with a 30-min scoping call CTA.
OpenCalculators
41Put your own numbers in and see what the decision actually costs.
- CalculatorGST India
Liability Start Finder
Enter your peak aggregate annual turnover and the FY you first crossed ₹5 crore — get the exact date the e-invoicing mandate attached to your PAN.
in E-Invoice Limit in India (2026): The ₹5 Crore Rule, 30-Day Window & Who's Exempt - CalculatorGST India
Penalty Exposure Calculator
Invoices per month × average tax × months non-compliant — the statutory Section 122 exposure and the buyer ITC you're putting at risk.
in E-Invoice Limit in India (2026): The ₹5 Crore Rule, 30-Day Window & Who's Exempt - CalculatorGST India
Validity Calculator
Distance and cargo type in — validity days and the extension-window rules out.
in E-Way Bill Rules 2026: State-Wise Limits, Validity & Penalties - CalculatorGST India
Detention Calculator
Consignment value and GST rate in — the Section 129 release payment out, for taxable and exempt goods.
in E-Way Bill Rules 2026: State-Wise Limits, Validity & Penalties - CalculatorGST India
FY Cutover Impact Checker
Enter FY 2025-26 AATO and your business profile — get the ranked list of GST changes that apply to you from 1 April 2026.
in GST Changes From 1 April 2026: New Rules, Limits & What Your Business Must Do - CalculatorGST India
HSN Digit Picker
Enter your AATO and invoice type — get the 4-digit or 6-digit HSN verdict under Notification 78/2020.
in GST Invoice Format 2026: Free Excel, Word, PDF & ERPNext Templates (All Mandatory Fields) - CalculatorCommerce
Payment Mix Cost Calculator
Calculates the true monthly Shopify cost for an Indian store from GMV and payment mix — modelling COD's exemption from Shopify's transaction fee and UPI's zero bank-level MDR.
in What Shopify Really Costs an Indian Seller (2026) - CalculatorCommerce
Which Plan Tier Is Actually Cheapest
Compares Basic, Grow and Advanced on total monthly cost — plan fee plus tiered transaction fee — at your GMV and prepaid share.
in What Shopify Really Costs an Indian Seller (2026) - CalculatorCommerce
Place of Supply Splitter
Determines whether a supply is intra-state or inter-state from supplier and delivery state, shows the required CGST/SGST or IGST breakdown, and contrasts it with Shopify's single undifferentiated tax line.
in Shopify and GST: Why Your Invoices Are Not Compliant (2026)
Interactives
112Explorers, simulators and deciders that answer "which one applies to me?"
- InteractiveAccounting
Account Tree Explorer
The chart's structure as a clickable tree — every node shows its Schedule III head and, where relevant, the ERPNext account type it must carry.
in Chart of Accounts for Indian Companies (2026): Free ERPNext Template + Schedule III Mapping - InteractiveAccounting
Schedule III Mapper
Six Schedule III lines that trip up chart design — trade payables, inventories, statutory dues, borrowings, PPE, GST credits — each mapped to its ledgers.
in Chart of Accounts for Indian Companies (2026): Free ERPNext Template + Schedule III Mapping - InteractiveGST India
Threshold Timeline
The six notification tiers that took the e-invoice limit from ₹500 crore to ₹5 crore, with notification numbers.
in E-Invoice Limit in India (2026): The ₹5 Crore Rule, 30-Day Window & Who's Exempt - InteractiveGST India
Exemption Explorer
Pick your entity category and see whether the Rule 48(4) exclusion covers you — including the SEZ unit vs developer trap.
in E-Invoice Limit in India (2026): The ₹5 Crore Rule, 30-Day Window & Who's Exempt - InteractiveGST India
State Limit Lookup
Pick your source state — get the intrastate e-way bill threshold and the notification quirks worth knowing.
in E-Way Bill Rules 2026: State-Wise Limits, Validity & Penalties - InteractiveGST India
Applicability Decider
Seven movement scenarios — inter-state, intrastate, job work, handicrafts, non-motorised, exempt goods — with the verdict for each.
in E-Way Bill Rules 2026: State-Wise Limits, Validity & Penalties - InteractiveGST India
Doc Series Inspector
Paste your Sales Invoice naming series — see exactly how the counter behaves on 1 April 2026 and what pattern to use instead.
in GST Changes From 1 April 2026: New Rules, Limits & What Your Business Must Do - InteractiveGST India
New-FY Checklist
The FY 2026-27 GST cutover checklist — annual return, LUT, series, e-invoice sweep, GTA declarations and scheme windows, grouped and tickable.
in GST Changes From 1 April 2026: New Rules, Limits & What Your Business Must Do - InteractiveGST India
Mandatory Field Checker
Choose B2B, B2C, export, SEZ or reverse-charge — see the exact Rule 46 fields your invoice must carry, with clause references.
in GST Invoice Format 2026: Free Excel, Word, PDF & ERPNext Templates (All Mandatory Fields)
Code recipes
61Copy-paste scripts and queries, each solving one specific problem.
- Code recipeAccounting
Import Recipe
The import sequence, the exact CSV column spec, a post-import health-check script, and an n8n drift watch for multi-company groups.
in Chart of Accounts for Indian Companies (2026): Free ERPNext Template + Schedule III Mapping - Code recipeGST India
Threshold Watch Recipes
Client script, server script, hooks.py and n8n variants of an AATO tripwire that alerts accounts before the ₹5 crore line is crossed — all running on your own infrastructure.
in E-Invoice Limit in India (2026): The ₹5 Crore Rule, 30-Day Window & Who's Exempt - Code recipeGST India
Expiry Watch Recipes
A dispatch-time warning, an hourly expiring-bills sweep over the e-Waybill Log, a packaged hooks.py variant, and driver WhatsApp alerts via n8n.
in E-Way Bill Rules 2026: State-Wise Limits, Validity & Penalties - Code recipeGST India
Cutover Recipes
Client script that blocks stale series and dead LUTs, a March countdown scheduler, a hooks.py variant, and an n8n smoke test that verifies the new series on 1 April morning.
in GST Changes From 1 April 2026: New Rules, Limits & What Your Business Must Do - Code recipeGST India
ERPNext Print Format
A complete, Rule 46-compliant Jinja print format for Sales Invoice — plus the signed e-invoice QR block, a five-step install, and optional print CSS.
in GST Invoice Format 2026: Free Excel, Word, PDF & ERPNext Templates (All Mandatory Fields) - Code recipeCommerce
The Four Extension Points
Copyable skeletons for the four Medusa v2 extension points — workflow hooks, event subscribers, custom modules and API routes — with guidance on which to reach for.
in What You Actually Get When You Run Medusa.js (2026) - Code recipeERP
Report Permission Recipe
Three tabs of real Python. Audit: a bench console script that lists every user and doctype pair sitting in the fail-open cell, plus the grep that finds vulnerable call sites in your apps. Harden: a fail-closed wrapper to use instead of build_match_conditions. Verify: the assert-non-empty test to keep in CI.
in Why ERPNext Reports Can Ignore User Permissions (and Which Version Leaks) - Code recipeERP
Scheduler Liveness Recipe
Three tabs of runnable checks and configuration: trustworthy liveness checks that read the shared database and Redis rather than the file lock, honest workarounds clearly labelled as hacks, and the upstream Redis-heartbeat fix with the verbatim buggy code it replaces. Copy button on each tab.
in ERPNext Scheduler Shows Process Not Found in Docker — It's a False Negative - Code recipeERP
Diagnose / Fix / Verify Recipe
Three copyable tabs: a bench console script that lists every at-risk doctype on your instance, three fix routes including the Property Setter that reproduces the upstream patch, and a verification script that prints the actual match condition the permission engine generates for a restricted user.
in ERPNext Strict User Permissions Hides Every Purchase Invoice (And Asset and Shipment Are Still Broken)
Downloads
2Templates and reference files, ready to import.
- DownloadAccounting
Template Downloads
The India Schedule III this workflow — ERPNext this setup Importer CSV plus an Excel workbook with per-ledger Schedule III mapping.
in Chart of Accounts for Indian Companies (2026): Free ERPNext Template + Schedule III Mapping - DownloadGST India
Template Downloads
Free GST invoice templates for 2026 — Excel with live formulas, an editable Word layout, and a print-ready PDF, each with all mandatory fields and an IRN/QR placeholder.
in GST Invoice Format 2026: Free Excel, Word, PDF & ERPNext Templates (All Mandatory Fields)