SoloFlow vs Accountable: which tool for Belgian freelancers in 2026?

Since 1 January 2026, every Belgian VAT-registered business must issue and receive its B2B invoices in a structured format via the Peppol network. A PDF sent by e-mail is no longer enough. In this context, two Belgian apps keep coming up in freelancers’ searches: SoloFlow and Accountable. Yet they don’t quite play in the same category. Here is an honest comparison to help you decide based on your profile.

In short: two different philosophies

Accountable is first and foremost an accounting and tax tool for Belgian freelancers: beyond invoicing, it manages your expenses, prepares your VAT returns and your personal income tax. SoloFlow is a mobile-first mini-ERP: it combines invoicing, CRM, tasks and calendar in a single app, designed to be used in Belgium as well as in France.

In other words: if your priority is to manage your Belgian taxes from A to Z, Accountable has a head start. If your priority is to run your day-to-day business (clients, quotes, invoices, follow-ups) from your phone, SoloFlow is more complete on that ground.

Comparison table

Criterion	SoloFlow	Accountable
Starting price	Free (10 docs/month, 50 contacts)	Free (restricted)
Paid offer	€9.99/month or €99.99/year	Invoicing €9.90/month → Max €59.90/month (annual, excl. VAT)
Peppol (send + receive)	Included from the Pro plan (50 transactions/month)	Free and unlimited on all plans, including Free
Native mobile app	iOS + Android	iOS + Android
Web app	Yes (app.soloflow.online)	Yes, on paid plans
Built-in CRM	Yes (Contact → Lead → Qualified → Client)	No
Tasks + calendar	Yes (native calendar sync)	No
Offline mode	Yes (real offline-first)	No
VAT / tax filings	No	Yes (full tax module)
Markets covered	Belgium + France (7 languages)	Belgium (DE/FR presence)

What Accountable does better

Let’s be honest: on several points, Accountable is more advanced.

Free Peppol, even on the Free version. This is Accountable’s central argument, and it’s real: sending and receiving Peppol invoices is unlimited and free on all plans, including the free version. For a Belgian freelancer who just wants to comply with the 2026 obligation without paying anything, it’s hard to beat.

The tax module. Accountable doesn’t just invoice: it tracks your expenses, calculates your VAT and helps you prepare your filings (VAT, personal income tax). For a Belgian freelancer looking to reduce their dependence on an accountant, it’s a real asset. SoloFlow, for its part, offers no tax-filing module.

Maturity. Accountable has been established on the Belgian market for several years and enjoys a user base and social proof that SoloFlow, launched in 2026, doesn’t have yet.

What SoloFlow does better

A real mini-ERP, not just invoicing. SoloFlow includes a CRM with status progression (Contact → Lead → Qualified → Client), task management and a calendar synced with your phone’s native calendar. You track your prospects, appointments and follow-ups in the same place as your invoices. Accountable doesn’t offer this sales-management dimension.

Real offline mode. SoloFlow is built “offline-first”: you can view and create documents without a connection, and syncing happens automatically afterwards. Handy on a job site, at a client’s or on a train.

Dual-market Belgium + France coverage. SoloFlow is designed to work on both sides of the border and comes in 7 languages. For a freelancer invoicing clients in Belgium and France, or considering moving to either country, it’s a structural advantage. In France, SoloFlow relies on A-Cube, a Plateforme Agréée (PA — French government-accredited platform) registered with the DGFiP.

Pricing clarity. SoloFlow has a simple grid: free, then €9.99/month (or €99.99/year) for unlimited use. Accountable multiplies the tiers (Invoicing, Bookkeeping, Taxes, Max), and its free offer is deliberately restricted to push users towards the more expensive “Taxes” plans.

What does it cost, concretely?

On pure invoicing, the two are close: the first paid plan is €9.99/month at SoloFlow and €9.90/month (annual, excl. VAT) at Accountable. The difference appears when you add the tax module: at Accountable, filing preparation pushes the bill up to €20.90-29.90/month for the “Taxes” plans, and even €59.90/month for the Max plan. SoloFlow doesn’t offer this service, so it doesn’t charge for it — it’s up to you whether you need it.

Also worth noting: at Accountable, Peppol is free and unlimited, while SoloFlow’s Pro plan includes 50 Peppol transactions per month, extendable with packs of 50 credits at €7.99 (one-time purchase). For a very high volume of electronic invoices, Accountable’s model is more economical. And until 31 December 2026, SoloFlow offers free e-invoice receiving.

Which tool for which profile?

Choose Accountable if: you’re a Belgian freelancer, you want to manage your VAT and taxes in the same tool as your invoices, you’re looking for free unlimited Peppol, and sales tracking (CRM, calendar) doesn’t interest you.

Choose SoloFlow if: you want a complete management tool (invoices + clients + tasks + calendar) rather than accounting software, you often work on the move (offline mode), you invoice on both sides of the Belgian-French border, or you appreciate simple, readable pricing.

Many Belgian freelancers ultimately combine a sales-management tool with accounting support anyway. So the real question is: do you want software that also does the accounting, or software that runs your business and leaves the accounting to your accountant?

FAQ

Is Accountable really free for Peppol?

Yes. Based on information published in July 2026, Accountable offers free, unlimited sending and receiving of Peppol invoices on all its plans, including the Free version. It’s a strong argument for a Belgian freelancer who wants to become compliant at no cost.

Does SoloFlow handle Belgian VAT?

SoloFlow calculates VAT on your invoices and quotes, but offers no tax-filing module (VAT, income tax). If you’re looking to prepare your filings within the app, Accountable is the better fit on that point.

Can I use SoloFlow from my computer?

Yes. SoloFlow has native iOS and Android apps and a complete web app (app.soloflow.online), usable from any browser. Accountable also offers a web version, but on its paid plans.

Which one should I choose if I invoice in Belgium and France?

SoloFlow is the only one of the two to natively cover both markets, in 7 languages. In France, it relies on A-Cube, a Plateforme Agréée registered with the DGFiP. Reminder of the French deadlines: receiving mandatory for all businesses from 1 September 2026, issuing for small businesses and SMEs from 1 September 2027.

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To understand the full electronic invoicing timeline, see our 2026 electronic invoicing guide. You can also read our SoloFlow vs Billit comparison.

Comparison written by the SoloFlow team based on publicly available information as of July 2026. Spotted an inaccuracy? Let us know: hello@soloflow.online