Somdul, FlowAccount, PEAK and Express compared, for accounting practices
A fair comparison for accounting practices choosing a program. Somdul is our product, so we've kept to facts: everything about the others comes from their own websites, read on 24 October 2026, and where a site doesn't say, we don't guess. Prices and features change, so check their sites before deciding.
| What | Somdul | FlowAccount | PEAK | Express |
|---|---|---|---|---|
| Kind of program | Online, in the browser | Online, with iOS and Android apps | Online, with iOS and Android apps | Windows program bought once (one PC or a LAN); also a hosted cloud version |
| Price to start | Solo ฿590 a month: 2 staff logins, 15 client companies | Free plan; paid plans from ฿165 a month (฿1,990 a year) | Free plan; paid plans from ฿2,500 a year, before VAT | Licence from ฿19,000 before VAT, paid once; cloud ฿380 per user a month, at least 4 users |
| Companies per subscription | One plan covers your clients: 15, 40 or 120 client companies | One plan per company | One plan per company | Several companies' data on the same computer |
| Free trial | 30 days, no card | 30 days on paid plans | 30 days | Not found on its website |
| For accounting practices | Made for them: practice overview, monthly checklists and filing deadlines for every client, team tasks, fees | Free partner programme with a Partner Center; partners get the top plan (฿5,490) free for a year | Partner programme for accounting firms | Lists an "Express สำนักงานบัญชี Hitech" edition |
| Client portal | Yes, client logins are free | Not found on its website | Not found on its website | Not found on its website |
| e-Tax Invoice | By Time Stamp; XML file (unsigned) | By Time Stamp | By Time Stamp; e-Tax Invoice & e-Receipt on PRO Plus and PREMIUM | e-Tax Invoice & e-Receipt through INET or KBank, as an add-on |
| Payroll and social security | In every practice plan, with the PND 1 and SSO files | In Pro Business, or an add-on at ฿249 a month | PEAK Payroll; the number of employees depends on the plan | Not found on its website |
| Languages | Seven: Thai, English, Chinese, Japanese, Burmese, Lao, Khmer | Thai and English | Thai and English | Thai, or a Thai-English edition |
| On a phone | In the phone's browser, nothing to install; receipts scanned with the camera | Apps for iOS and Android | PEAK Mobile for iOS and Android | Not found on its website |
Where the others are stronger
- FlowAccount is far bigger and better known: its site counts 160,000+ businesses and 17,000+ accountants and admins using it. It has native apps, an automatic bank feed add-on, an Open API, and a free partner programme for accounting firms.
- PEAK has 30,000 companies and 1,800 accounting firms on it, by its own count. It offers both e-Tax routes, including e-Tax Invoice & e-Receipt with a service provider, native apps, and marketplace links and an API on its higher plans.
- Express has more than 38 years in Thai accounting and thanks over 95,000 customers on its site. It runs on your own computers without the internet, and has a dealer network, training rooms and on-site setup.
- Somdul is new and small. It has no app to install and no automatic bank feeds (you import statements), it doesn't do e-Tax Invoice & e-Receipt with a digital certificate, and it doesn't file returns for you.
Where Somdul is different
- Built for practices first: one subscription covers many client companies, and the practice overview shows every client's month at once.
- A free portal for your clients, and upload links so they can send documents from a phone without signing in.
- Tax files straight from the books: RD Prep files for PND 1, 1A, 3 and 53, the social security file, and the PP 30 figures.
- Seven languages, so a team with Thai, Myanmar, Lao, Cambodian, Chinese or Japanese staff can each work in their own.
Sources
Each vendor's own pages, read on 24 October 2026. PEAK says its prices exclude VAT; Express shows prices before and with 7% VAT; FlowAccount's pricing page doesn't say.
- FlowAccount: prices and plans https://flowaccount.com/pricing
- FlowAccount: prices and plans (English) https://flowaccount.com/en/pricing
- FlowAccount: home page https://flowaccount.com/
- FlowAccount: payroll https://flowaccount.com/en/payroll
- FlowAccount: partner programme for accounting firms https://flowaccount.com/accountingfirm/become-our-partner
- PEAK: prices and plans https://www.peakaccount.com/software-package
- PEAK: home page https://www.peakaccount.com/
- PEAK: partner programme for accounting firms https://www.peakaccount.com/accounting-firm-partners-program
- Express: prices and plans https://express.co.th/express-v1/
- Express: cloud version https://express.co.th/express-on-cloud/
- Express: e-Tax Invoice & e-Receipt https://express.co.th/express-etax/
- Express: home page https://express.co.th/
FlowAccount, PEAK and Express are the names and trademarks of their owners. Somdul is not connected with them. Spotted something out of date? Tell us and we will correct it.