Choose MailSlurp if…
Your volume is low, seasonal or unpredictable, and you would rather have an invoice that follows your consumption exactly than a flat rate.
www.mailslurp.comComparison
Facteur or MailSlurp: which should you pick?
MailSlurp sells a subscription for features and then bills usage as you go: at low, irregular volume, it is the cheaper model of the two.
Facteur includes volume in the subscription and sells the rest as stacking packs valid for twelve months, which makes the invoice predictable when a test suite runs every day.
Where they differ
| Facteur | MailSlurp | |
|---|---|---|
| Billing model | Volume included, then stacking packs | Subscription + usage as you go |
| Predictable invoice | Known in advance | Varies with the month’s usage |
| Volume included in the subscription | Yes, by plan | No, billed separately |
| Per-inbox quotas | Yes, with overage alerts | Not documented |
| SAML SSO | Included from the Team plan | On higher tiers |
| Hosting | France, billed in euros | Outside France, billed in dollars |
| DPA | Downloadable online | On request |
What MailSlurp does better
- Pay-as-you-go is fairer when volumes are low or very irregular: you do not pay for capacity you never use.
- Their entry tier gives permanent inboxes at the first price point, without waiting for a middle plan.
- It is a long-tooled, well-documented product with a wide API surface. We are starting out.
Choose Facteur if…
Your suite runs continuously and you want to know in advance what the month will cost, if you need per-inbox quotas so one runaway test cannot spend everyone else’s budget, or if European hosting is a constraint.
Create a free accountThe prices, at their source
Read these carefully: at MailSlurp these amounts do not include message volume, which is billed on top. The two columns therefore do not measure the same thing, and we would rather write that than build a comparison that flatters ours.
Facteur
- Solo12 €/mo
- Team39 €/mo
- Business99 €/mo
MailSlurp
- 5 inboxes permanentes18 €/mo
- 100 inboxes permanentes63 €/mo
- inboxes illimitées120 €/mo
Converted from US dollars at 0.92, read on 9 August 2026.
Where these figures come from
- Plans relevés sur app.mailslurp.com/pricing le 9 août 2026 : Starter 19,99 $, Pro 69 $, Growth 129,99 $ par mois.
- La page annonce « Pick a subscription for features, then pay as you go for usage » : le volume de messages est facturé en supplément et n'est pas inclus dans ces montants. Aucun volume inclus n'est donc comparé ici.
Frequently asked
- Is Facteur cheaper than MailSlurp?
- At low volume, often not: paying for usage costs less than a flat rate you do not use. Once a test suite runs daily, a subscription with volume included becomes more predictable and generally cheaper. The simulator on the pricing page answers for your own volume.
- What is the difference between capacity packs and pay-as-you-go?
- A pack is bought up front, valid for twelve months, stacks with others, and is never lost on a downgrade. Pay-as-you-go is computed after the fact. The first makes the invoice predictable, the second tracks real consumption.
- What is a per-inbox quota?
- A message limit belonging to each inbox, with an alert as it approaches. It is what stops a looping test from consuming the whole organisation’s capacity without anyone noticing before the invoice.
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