Best Digital Mailbox Provider 2026: Comparison
Providers certified by the Financial Administration of the Slovak Republic — pricing, features, and integrations in one place. Choose the right e-invoicing partner before the mandatory 2027 deadline.
The ranking and ratings of competing providers come from the independent CPDS comparison portal digitalny-postar.eu — for more details and full reviews, visit it directly.
ePošťák
Slovenský digitálny poštár certifikovaný FS SR pod číslom EFSK000012. Postavený na vlastnom Peppol Access Point — žiadny proxy cez tretiu stranu.
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- ✓Vlastný Peppol AP — žiadny proxy cez tretiu stranu, plný EFSK000012 status v registri FS SR
- ✓Multi-firm dashboard — účtovníci spravujú neobmedzene klientov z jedného účtu
- ✓Enterprise API + SAPI 1.0 — oba štandardy bez doplatku, OAuth client_credentials + dokumenty cez UBL
- ✓Peppol directory + kalkulačka — verejné vyhľadávanie partnerov + okamžitý odhad nákladov pre integrátorov
- ✓Príjem vo webovom rozhraní €0 — bezplatný do limitu programu Zadarmo (500 prijatých a 5 odoslaných faktúr mesačne) — API a integračné použitie podľa cenníka
Ostatní poskytovatelia
Zobrazených je 56 alternatív zoradených podľa CPDS hodnotenia z digitalny-postar.eu. Názov poskytovateľa otvorí jeho CPDS profil.
#1BillitBelgicko · od 2014Invoice receiving€7,50/mes (Standard) · príjem v cene plánuInvoice sending€0 (Free, len odosielanie) · od €7,50/mes4.0
#2ESO9Česká republika · od 1997Invoice receivingod €9/mes (Základní, 50 dok. spolu)Invoice sendingZákladní €9 · Stredné/malé €39 · Rastový €99 · Veľký €199 · Korp. €3993.5
#3DokladoSlovensko · od 2020Invoice receiving€0 (Free, 7 dokl./mes) · €9,90/mes (PLUS, 70 dokl.)Invoice sendingV cene plánu · €0,20+DPH za doklad nad limit3.5
#4Asseco SolutionsSlovensko · od 1990Invoice receiving€0 (Starter, do 50 dok./mes spolu)Invoice sending€9,90 / €29 / €69 / €299+ (Basic / Business / Pro / Custom)2.5
#5OdooBelgickoInvoice receiving€0 — bezplatná Peppol registrácia a One App Free; implementácia a hosting sa môžu líšiťInvoice sendingNot published2.5
#6SOFTIP Digitálny poštárSlovensko · od 1991Invoice receivingNot publishedInvoice sendingNot published2.0
#7Pohoda EFASlovensko · od 1993Invoice receivingNot publishedInvoice sendingNot published2.0
#8eConnectHolandskoInvoice receivingNot publishedInvoice sendingNot published2.0
#9ArchilesSlovenskoInvoice receivingNot publishedInvoice sendingNot published2.0
#10GRiTČeská republika · od 1996Invoice receivingNot publishedInvoice sendingNot published2.0
#11MIBFORMASlovensko · od 1995Invoice receivingNot publishedInvoice sendingNot published2.0
#12QvaliaŠvédsko · od 2010Invoice receiving€0 (Free, 1 správa/mes) · spolu s odoslanímInvoice sendingSmall €9 (25) · Medium €39 (100) · Large €99 (1 000)1.5
ℹ️ More information
on each provider is available at digitalny-postar.eu — the independent CPDS comparison portal for the Slovak market. Star ratings, N/R statuses, and table order use its 11 August 2026 snapshot.
Why compare digital mailbox providers?
From 2027, every business and sole trader in Slovakia will be required to send and receive electronic invoices through the IS EFA system of the Financial Administration of the Slovak Republic. To connect to this system you need a certified digital mailbox provider — an intermediary that delivers your invoices to the recipient in a structured UBL 2.1 format.
The Slovak Financial Administration list dated 10 August 2026 contains 57 certified providers — ranging from local Slovak ERP firms through Big Four auditors to global e-invoicing players. The 11 August digitalny-postar.eu snapshot contains the same 57 profiles: ePošťák is separated from the ranking as the publisher's product, 17 competitors are rated, and 39 are marked N/R because comparable public evidence is incomplete.
This overview compares all 57 profiles available in the latest snapshot across 15 criteria — from pricing and Peppol certification to the availability of an API and customer support. The goal is not just to find the cheapest option, but the provider best suited to your type of business — whether you are a sole trader, a mid-size company, an online shop, an accounting firm, or a multinational corporation.
Every provider on the official list must meet the certification requirements of the Financial Administration. The differences lie in pricing transparency, user experience, automation, support localisation, and accessibility for Slovak micro-businesses. The market is young and pricing is still in flux — the figures and editorial order shown here reflect the 11 August 2026 snapshot and may change before the 1 January 2027 mandate.
How to get started with e-invoicing?
You submit the provider and intermediary selection through the Slovak Financial Administration application. According to the official guide, you need authority for a taxable entity with an assigned and notified tax ID, enter an email address and phone number, and allow the selected intermediary to receive the entity data. Submission is confirmed in the personal internet zone.
Submitting the selection does not make the mailbox active immediately. The selected intermediary completes its contractual and technical setup and then arranges the company's availability in the Peppol Directory under its own onboarding process. Confirm activation timing with the selected provider; the official guide does not guarantee a universal two-minute activation.
For companies with their own ERP or accounting system, the Enterprise API is available with over 48 endpoints, TypeScript and Python SDKs, and a full OpenAPI reference. Users without their own system can issue invoices in the web interface. We demonstrated this feature at a Financial Administration webinar.
Detail každého poskytovateľa
Kompaktný prehľad pre každého konkurenta — šesť kľúčových kritérií, ceny príjmu a odosielania, CPDS rating. ePošťákove parametre nájdeš v sekcii 01.
Podrobné porovnanie 56 poskytovateľov
✓ yes · ✗ no · ~ partial · verifying = awaiting confirmation · Unknown = information not publicly available
What to evaluate when choosing
Pricing and transparency
Compare not just the monthly fee but also the per-document cost for sending and receiving. Some providers offer receiving in the web interface in the plan — others charge per invoice. ePošťák provides receiving in the web interface within the Free program limits (500 received and 5 sent invoices per month). Also watch out for hidden fees on API calls, data exports, or archiving older invoices. A clear price list with no asterisks is a basic indicator of a trustworthy provider.
Integrations with your software
If you use an accounting system (POHODA, Money S3, MRP, or a custom ERP), check for API availability or a direct integration. Manually downloading invoices quickly becomes unsustainable. ePošťák offers an Enterprise API with over 48 endpoints, TypeScript and Python SDKs, webhook notifications, and a full OpenAPI reference. For companies with their own ERP, an API-first approach is essential.
Customer support and reliability
A digital mailbox provider is critical infrastructure — if it goes down, you stop receiving invoices. Verify whether the provider has clear availability terms, communicates in Slovak, and is reachable on working days. ePošťák offers email and phone support during business days.
Peppol and international invoicing
If you invoice internationally or receive invoices from foreign suppliers, Peppol certification is essential. Peppol is the international standard for e-invoice exchange, in use in Belgium, Norway, Italy, Germany, and many other countries. ePošťák has been a member of OpenPeppol since March 2026 and is a certified Peppol access point — enabling invoicing across the entire Peppol ecosystem.
Liability for damages
What happens if your provider fails to deliver an invoice on time and you receive a penalty for the delay? Some providers clearly define liability for service outages in their terms and conditions. Review each provider's general terms before signing up.
Scalability and future-proofing
Consider how your business will grow. You may need 50 invoices per month today, but 500 in a year. Choose a provider that can scale with you — flexible plans, an API for automation, and multi-client access are key for growing businesses.
Which provider is right for you?
Every type of business has different requirements from a digital mailbox provider. Below are our recommendations by company size and industry, based on publicly available information about each provider's features.
Sole traders and small businesses
Sme medzi top voľbami
ePošťák
- +Zadarmo: 500 prijatých + 5 odoslaných mesačne; platené SMB plány majú neobmedzený príjem vo webovom rozhraní.
- +Odosielanie 0 € do 31. 12. 2026, potom od 8 €/mes podľa aktuálneho cenníka.
- +API, automatizácia, hromadné použitie a white-label sa riadia samostatným cenníkom.
Žiadne explicitné alternatívy pre tento segment.
Sole traders and small businesses processing up to 50 invoices per month will appreciate simple onboarding, a freemium plan with no commitment, and receiving in the Free program up to 500 received and 5 sent invoices per month. ePošťák is designed so you can start using e-invoicing within two minutes — no sales call required. The smallest firms may also find Asseco QASIDA's free Starter plan (up to 50 invoices/month) or Doklado's free plan (up to 7 documents/month) worth considering.
Mid-size businesses
Sme medzi top voľbami
ePošťák or Flowis
- +Zadarmo: 500 prijatých + 5 odoslaných mesačne; platené SMB plány majú neobmedzený príjem vo webovom rozhraní.
- +Odosielanie 0 € do 31. 12. 2026, potom od 8 €/mes podľa aktuálneho cenníka.
- +API, automatizácia, hromadné použitie a white-label sa riadia samostatným cenníkom.
Žiadne explicitné alternatívy pre tento segment.
Mid-size companies (50–500 invoices per month) need API integration, automation, and reliable support. ePošťák offers an Enterprise API with 48+ endpoints, a TypeScript/Python SDK, webhook notifications, and batch operations at a transparent price. Flowis is an alternative for companies already using their process management ecosystem. Both providers hold Peppol certification for international invoicing.
Large enterprises
Sme medzi top voľbami
ePošťák, EY, or Flowis
- +Zadarmo: 500 prijatých + 5 odoslaných mesačne; platené SMB plány majú neobmedzený príjem vo webovom rozhraní.
- +Odosielanie 0 € do 31. 12. 2026, potom od 8 €/mes podľa aktuálneho cenníka.
- +API, automatizácia, hromadné použitie a white-label sa riadia samostatným cenníkom.
Žiadne explicitné alternatívy pre tento segment.
Enterprises processing thousands of invoices per month need robust API access, batch operations, and webhook integration. ePošťák offers an Enterprise API with 48+ endpoints, TypeScript and Python SDKs, batch sending, OCR extraction, a webhook queue with guaranteed delivery, and a full OpenAPI reference — at a fraction of the cost of enterprise solutions from EY or Flowis. EY, as a Big Four firm, also provides tax compliance advisory. For enterprises seeking a technically advanced solution without the enterprise price tag, ePošťák is the ideal choice.
Online shops
Sme medzi top voľbami
ePošťák
- +Zadarmo: 500 prijatých + 5 odoslaných mesačne; platené SMB plány majú neobmedzený príjem vo webovom rozhraní.
- +Odosielanie 0 € do 31. 12. 2026, potom od 8 €/mes podľa aktuálneho cenníka.
- +API, automatizácia, hromadné použitie a white-label sa riadia samostatným cenníkom.
Žiadne explicitné alternatívy pre tento segment.
Online shops benefit from ePošťák's REST API, which automatically generates and sends e-invoices for every order. The same API works for WooCommerce, Shopify, and custom platforms.
Accountants and accounting firms
Sme medzi top voľbami
ePošťák
- +Zadarmo: 500 prijatých + 5 odoslaných mesačne; platené SMB plány majú neobmedzený príjem vo webovom rozhraní.
- +Odosielanie 0 € do 31. 12. 2026, potom od 8 €/mes podľa aktuálneho cenníka.
- +API, automatizácia, hromadné použitie a white-label sa riadia samostatným cenníkom.
Žiadne explicitné alternatívy pre tento segment.
Accountants managing multiple clients need multi-client access — the ability to manage invoices for multiple company registration numbers from a single account. ePošťák supports this natively. It also offers bulk invoice downloads, filtering by client, and automatic notifications for new invoices.
IT companies and developers
Sme medzi top voľbami
ePošťák
- +Zadarmo: 500 prijatých + 5 odoslaných mesačne; platené SMB plány majú neobmedzený príjem vo webovom rozhraní.
- +Odosielanie 0 € do 31. 12. 2026, potom od 8 €/mes podľa aktuálneho cenníka.
- +API, automatizácia, hromadné použitie a white-label sa riadia samostatným cenníkom.
Žiadne explicitné alternatívy pre tento segment.
IT firms and developers prioritize a robust API with high-quality documentation. ePošťák is built API-first — the Enterprise API has 48+ endpoints, TypeScript and Python SDKs, a webhook queue, batch operations, OCR extraction, and a sandbox environment. The full OpenAPI specification and interactive documentation are available at epostak.sk/api/docs.
Questions about choosing a digital mailbox provider
Presný postup, rozdiel medzi migračným kódom a PFS tokenom aj online transfer nájdete na stránke Ako zmeniť digitálneho poštára.
How we compared
This comparison draws from publicly available sources and the 11 August 2026 editorial snapshot from digitalny-postar.eu — provider websites, official price lists, documentation, OpenAPI specifications, and general terms and conditions. We evaluated receiving and sending prices, freemium availability, API and multi-client access, Slovak-language support, Peppol certification, and liability for damages. Where public CPDS pricing is missing, we show “Not published” or “verifying” instead of filling in speculation.
The latest external snapshot contains ePošťák outside the ranking, 17 rated competitors, and 39 N/R profiles. It matches the Financial Administration list dated 10 August 2026 with 57 CPDS providers in total. N/R is not a low score; it means that comparable public evidence is not yet sufficient for ranking. Where data was not publicly available, we show 'verifying' or 'Unknown' — we do not fill in speculation. We recommend re-checking prices directly with the provider before signing a contract. If you represent one of the providers and would like to update your information, contact us at info@epostak.sk. We are the authors of ePošťák, so this comparison is not neutral — but we strive to be fair, transparent, and where competitors have a stronger offer in a specific segment, we acknowledge it.
Competitor information and editorial order use the 11 August 2026 snapshot of public sources and may change. Re-verify prices with each provider before signing. If you represent one of the providers and would like to update your information, contact us at info@epostak.sk.
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