Question 1

Is there a free plan or trial?

Accepted Answer

30-day free trial — no credit card required. After 30 days your account automatically moves to STARTER, limited to 50 invoices/month. Upgrade via /settings/billing to remove the limit.

Question 2

What's the difference between STARTER, BUSINESS and ENTERPRISE?

Accepted Answer

STARTER (₫690k): 5 users, 50 invoices/month, AI chatbot + AI invoice extraction, basic features.
BUSINESS (₫2.3M): 15 users, 500 invoices, plus E-Contract, multi-currency, API access, Zalo support.
ENTERPRISE (custom quote): unlimited users, plus IFRS 16 lease accounting, inventory, multi-branch, a dedicated CSM.

Question 3

Is there a discount for startups?

Accepted Answer

Yes. Businesses under 2 years old with fewer than 10 employees get 30% off for the whole first year (business licence verification required). Contact tony@nkktech.com.

Question 4

Is there a discount for paying annually?

Accepted Answer

Yes. Prepay 12 months and pay for 10.2 months (15% off).

Question 5

Which payment methods do you accept?

Accepted Answer

5 gateways: VNPay (Visa/Mastercard debit), MoMo, ZaloPay, Stripe (USD), VietQR (instant bank transfer). A VAT invoice is generated automatically after every payment.

Question 6

Can I cancel at any time?

Accepted Answer

Yes. Self-service via /settings/billing → Cancel. Prorated refund within the first 7 days. After that, cancellation is non-refundable — the service continues until the end of the billing cycle.

Question 7

Is my data safe in the cloud?

Accepted Answer

There are 9 layers of defense-in-depth: Cloudflare DDoS protection + WAF, TLS 1.3 + HSTS preload, nginx WAF (OWASP CRS), fail2ban + CrowdSec, lockout after 5 failed logins + 2FA, RBAC + multi-tenant isolation (315/315 PASS), KMS encryption of personal data, audit log + hash chain, daily backups + 4h RTO.

Question 8

Multi-tenant — can my data get mixed up with other customers' data?

Accepted Answer

No. Every tenant has its own organizationId, and withOrgFilter is enforced on 100% of Prisma queries. 315/315 cross-tenant tests PASS. Zero leaks found in penetration testing.

Question 9

Are you ISO 27001 / SOC 2 certified?

Accepted Answer

It is on the roadmap for Q4/2026. We are technically aligned today but not yet certified. Our internal penetration test report can be shared under NDA.

Question 10

Do you comply with GDPR and Vietnam's 2023 personal data protection rules?

Accepted Answer

We are aligned with both, not certified. GDPR Art. 20 data export: one click via /api/users/me/export. Right to erasure: when an ADMIN deletes a user, the deletion cascades. Data is retained for 7 years as required by TT 200/2014.

Question 11

How are passwords stored?

Accepted Answer

bcrypt with cost 10 (~100 ms to compute). They cannot be reversed. 6-digit email OTPs are bcrypt-hashed with a 5-minute TTL. API tokens are SHA-256 hashed at rest.

Question 12

I'm using MISA / Bravo / Fast — can I switch?

Accepted Answer

Yes. We already support Excel/XLSX exports from MISA SME, Bravo and Fast → import into est-invoice. This covers: Chart of Accounts (TT 200), customers + vendors, documents (up to 3 years), employees + payslips, journal entries. Free for BUSINESS and ENTERPRISE.

Question 13

How long does migration take?

Accepted Answer

Under 100 customers and under 1,000 invoices: 1 day. 100-500 customers: 2-3 days. 500+ customers: 1 week.

Question 14

Can I keep my existing document (invoice) numbers?

Accepted Answer

Yes. The import format has a 'number' column, which is kept as is. Auto-numbering only applies to new documents.

Question 15

What technical support do you provide?

Accepted Answer

STARTER: email tony@nkktech.com, 48h SLA.
BUSINESS: email + Zalo, 24h SLA.
ENTERPRISE: email + Zalo + phone, 4h SLA during business hours.

Question 16

Do you offer training for accountants?

Accepted Answer

Yes. ENTERPRISE: 1 week of free on-site or remote training. BUSINESS: 2 one-on-one video sessions of 1 hour each. STARTER: self-paced video tutorials + chatbot Q&A.

Question 17

What happens if the service goes down?

Accepted Answer

99.5% SLA (at most ~3.6h of downtime per month). Cloudflare DDoS protection. Daily backups + 4h RTO. Status page + Slack alerts. If an outage lasts more than 1h, we issue a prorated refund under the SLA.

Question 18

Is there a roadmap customers can follow?

Accepted Answer

Yes. A public roadmap on GitHub Projects + a bi-weekly newsletter. Major release notes are at /changelog.

Question 19

How does it compare with MISA SME?

Accepted Answer

What est-invoice HAS and MISA DOES NOT: an AI legal chatbot covering 36 Vietnamese regulations, AI invoice extraction (Claude vision), KO/JA/ZH/TH languages, mobile-first native apps, IFRS 16 lease accounting, a modern cloud SaaS UI. MISA's strengths: 70% SME market share, brand familiarity, an on-premise option. Full comparison: /products/est-invoice/vs-misa.

Question 20

How about Bravo / Fast?

Accepted Answer

Bravo and Fast are on-premise and target small SMEs. They are similar to MISA but weaker at scale. est-invoice is cloud-native + AI and outperforms Bravo/Fast on speed and UX.

Question 21

How about SAP Business One / Oracle NetSuite?

Accepted Answer

SAP B1 / NetSuite suit businesses with more than 100 employees and budgets above ₫1B/year. est-invoice suits businesses with fewer than 100 employees and budgets below ₫100M/year. A different segment.

Question 22

How about QuickBooks / Xero?

Accepted Answer

QuickBooks / Xero have no Vietnamese tax compliance (TT 78, GTGT/TNDN/TNCN, BHXH), no Vietnamese UI, no VND formatting and no Vietnamese payment gateways. est-invoice wins outright for the Vietnamese market.

Question 23

Is there API documentation?

Accepted Answer

Yes. BUSINESS and above: https://est-invoice.nkktech.com/docs/api (OpenAPI 3.1 spec). RESTful with Bearer tokens. Outbound webhooks are documented.

Question 24

Do you integrate with CRMs (HubSpot / Salesforce)?

Accepted Answer

Manually: import contacts via CSV. Automatically via webhooks: on the roadmap for September 2026.

Question 25

Do you integrate with banks?

Accepted Answer

We currently support importing bank statement CSVs from MB, Techcombank, VPBank and Vietinbank, with transactions auto-matched to invoices. Phase 2: direct API connections (requires a partner bank).

Question 26

Is the mobile app native or a PWA?

Accepted Answer

Native, built with React Native + Expo SDK 51 for iOS and Android. It is currently in TestFlight / Play Internal testing — invited testers only.

Question 27

Is there an offline mode?

Accepted Answer

The mobile app works offline for 3 functions: receipt scanning (queued), viewing the dashboard, and AI assistant chat (cached data). It syncs automatically when you are back online. The web app needs an internet connection — it is cloud-first.

Question 28

Which webhook events are available?

Accepted Answer

On the roadmap for August. Planned events: document.created/updated/status_changed, expense.created/paid, payment.received, tenant.signup.

Question 29

What is the backend tech stack?

Accepted Answer

Next.js 16 (App Router) + strict TypeScript + Prisma ORM + SQLite (PostgreSQL planned for Q4) + Auth.js v5 + Anthropic Claude + Resend + Cloudflare.

Question 30

Do you support Korean, Japanese and Singaporean businesses?

Accepted Answer

Yes. A 6-language UI + multi-currency invoices (USD/JPY/SGD/KRW) + IFRS 16 lease accounting + multiple legal entities.

Question 31

Can I invoice in JPY / KRW / USD?

Accepted Answer

Yes, on BUSINESS and above. Vietcombank exchange rates are fetched automatically every day, and FX gains/losses are tracked separately.

Frequently Asked Questions

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Frequently Asked Questions

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