E-Signature in Mexico: Mifiel, Weetrust, CinCel and Legalario Compared

A buyer comparing e-signature platforms in Mexico shortlists names that rarely appear in English-language reviews: Mifiel, Weetrust, CinCel and Legalario. Unlike Spain, where half the shortlist publishes no price, all four of these publish one. What they do not agree on is the unit. Every one of them meters the document — and each meters it in a different way, so the four price pages cannot be compared line by line until you know which shape you are looking at.

Every figure below was read on each vendor’s own page on the check date shown above. Prices in this category move, so confirm the current plan before you buy. Two of the four quote prices with IVA included and two before IVA; that is noted on every figure, because at 16% it is not a rounding error.

Four platforms, four meters

• Prepaid credits, no subscription — Mifiel. You buy a pack of documents and spend it at your own pace.
• A pay-per-use calculator — Weetrust. You type in how many documents you expect a month and the page prices it.
• A subscription with a document allowance and unlimited users — CinCel. The seat is not the unit at all; the c.Doc is.
• A subscription that caps both documents and users — Legalario. Two ceilings at once, so either can be the one that forces an upgrade.

The question that decides between them is not “which is cheapest” but which of your two numbers — documents or people — is the one that grows.

The four platforms, from their own pages

• Mifiel. Its pricing page is built on three promises: “Paga sólo lo que uses: Los créditos para documentos nunca expiran”, “Sin suscripción forzada”, and a free trial pack of 5 documents. The unit is stated exactly: “1 documento firmado = 1 crédito de documento”. The published packs run from 10 documents at $89 each ($890) through 50 at $79 ($3,950), 100 at $59 ($5,900), 500 at $29 ($14,500), 1,000 at $19 ($19,000), 2,000 at $17 ($34,000) and 3,000 at $15 ($45,000), down to 5,000 at $12 ($60,000) — “Precios en MXN, IVA incluido. Los créditos no expiran.” Identity verification is a separate credit, for signers “que no cuentan con e.firma”, from $21.88 per verification in a pack of 50 to $12.95 in a pack of 1,000. The page lists “Firma electrónica avanzada incluida” and “Cumplimiento NOM-151 | Fecha cierta” among the features every pack includes, and describes Mifiel as “la primera plataforma de firma electrónica en México”.
• Weetrust. Its pricing page is headed “Paga por lo que usas” and prices a “Membresía weetrust” with a calculator: “Si consumes [N] documentos al mes”, then a “Total” marked “(IVA incluido)”. In the browser, 5 documents a month shows MXN $222, 20 shows $890 and 100 shows $2,146. The page does not state the period the Total covers, and the calculator gives no figure for the plan’s allowance past the number you type, so ask both before you commit. The membership lists, among other things, “Certificación NOM-151”, “e.firma SAT”, “Envío masivo”, “Plantillas y formularios” and “Usuarios y sub-usuarios”, and the trial is “14 días de prueba (5 docs gratis)”. One caution for anyone reading the page with a script rather than a browser: the unrendered HTML carries a placeholder total of “8,000” that the page replaces as soon as it loads. It is not a price.
• CinCel. Its pricing page sells subscriptions with an “Anual” / “Mensual” toggle marked “Ahorra hasta 30%”, and every price is “Precios en MXN sin IVA”. On the annual view, Business is $599/mes with “500 c.Docs” and 15 identity verifications (“15 IDV”); Business Pro is $1,799/mes with “1500 c.Docs” and adds brand customisation and “c.Docs API Support”. On the monthly view the same two are $856/mes with “42 c.Docs” and $2,570/mes with “125 c.Docs”. The page does not label the period of the c.Docs figure; read side by side, 42 a month on monthly billing sits next to 500 on annual billing, which is roughly the same yearly volume. Both paid plans carry “Usuario ilimitados” and “Equipo ilimitados”. The free plan has “3 c.Docs” and 1 user, with extra packs of 10 “Solo válido para plan Free”, and “c.Docs ilimitados (Plan anual)” is listed as an add-on. CinCel describes itself as “el 1er PSC en la Nube”.
• Legalario. Its plans page sells LegaSign with a “Al mes” / “Al año” toggle marked “Ahorra 20%”, and every price is “+IVA”. On monthly billing, Essentials is MXN $700 for “120 documentos al año” and “1 usuario”; Starter is $1,600 for “300 documentos al año” and “5 usuarios”; Premium is $3,000 for “600 documentos al año” and “10 usuarios”. On annual billing the same three are $558, $1,284 and $2,416 a month, shown as “Cobro anual de $6,700 +IVA”, “$15,400” and “$29,000”. Premium adds biometric checks — “OCR INE”, “INE vs Selfie” and “Validación RENAPO”. Corporativo is quoted, for “más de 7,000 documentos al año” and “Más de 20 usuarios”. Note that the document allowance is stated per year even on monthly billing.

What NOM-151 and e.firma on a price page do and do not tell you

Three of the four pages sell NOM-151 as a feature, and two mention the SAT’s e.firma. Both are real and both can be worth paying for — but neither is what makes a contract between private parties valid, and a buyer who believes otherwise will pay for the wrong thing.

For a commercial contract, the signature the Código de Comercio asks for is the Firma Electrónica of article 89, which mentions no certificate at all. The e.firma is the SAT’s certificate for tax filings, and NOM-151 is a retention standard — the constancia de conservación that fixes a document’s date and integrity — not a signature standard. We quote the statutes in full, with links to the official texts, in are electronic signatures legal in Mexico? — read that before deciding how much of these features you need.

Where NOM-151 does matter, one thing is worth checking yourself. A constancia de conservación is issued by a Prestador de Servicios de Certificación accredited by the Secretaría de Economía, and the Secretaría publishes the register: the PSC directory, which lists each accredited company and the exact services it is accredited for. On the check date, Cincel Certificadora Digital S.A.P.I. de C.V. appears there, accredited for “Servicio de sellos digitales de tiempo” and “Servicio de conservación de mensajes de datos”. Mifiel, Weetrust and Legalario do not appear under those names — which proves nothing on its own, because a platform can obtain its constancias from an accredited PSC it works with. So ask the question directly: which accredited PSC issues my constancias? The answer should be a name you can find in that directory.

Where Signatura fits

Signatura is built the other way round from everything above: one plan, priced per seat, with unlimited documents — no credit pack, no document allowance, no calculator, and no charge for the people who sign. If your document volume is high and the number of people who send is small, that is the shape that stays cheap as you grow, and it is the one shape nobody on this shortlist sells.

Our pricing page prices in Mexican pesos for a visitor in Mexico — from MX$435 per seat per month on the annual plan and MX$580 billed monthly, with the rate falling as seats are added. Every completed document carries a full audit trail and a SHA-256 tamper-evident seal that can be re-verified at any time; the detail is on our security page. That is the evidence article 97 of the Código de Comercio asks you to be able to show if a signature is disputed: that the signer controlled the signature, and that any later alteration can be detected.

Where Signatura is not the right answer, stated plainly: we are not a Prestador de Servicios de Certificación, we do not issue certificates, and we do not issue NOM-151 constancias. If your process requires a constancia de conservación, or signing with the SAT’s e.firma, the platforms above that offer those are the ones to look at. We would rather say so than oversell. The same comparison in other markets is in e-signature in Spain, e-signature in Brazil and e-signature in Portugal.

What to check before you sign anything

1. Which number grows: documents or people. Mifiel and Weetrust publish no user cap and CinCel’s paid plans list unlimited users; Legalario caps both. If you are adding people faster than documents, that decides it.
2. What counts as one unit. Mifiel says it plainly — “1 documento firmado = 1 crédito”. Ask every other vendor the same question, including whether a document that is sent but never signed is spent.
3. Whether the price includes IVA. Mifiel and Weetrust quote with IVA included; CinCel and Legalario quote before it. Add 16% to the second pair before you compare.
4. What happens at the ceiling. Legalario states its allowance per year; CinCel’s page does not label the period of its c.Docs figure; Weetrust’s calculator does not say what the Total covers. Get the answer in writing.
5. Whether you need NOM-151 or e.firma at all. For an ordinary commercial contract, the law asks for neither. If you do need a constancia, ask which accredited PSC issues it and check the name in the Secretaría de Economía directory.
6. Whether unused volume is lost. Mifiel’s credits never expire. A monthly or annual allowance you do not use is gone at the end of the period.

Frequently asked questions

What does e-signature cost in Mexico?

All four platforms on the usual shortlist publish a price, but in four different shapes. On their own pages: Mifiel sells prepaid credits from MXN $89 per document in a pack of 10 down to $12 in a pack of 5,000, IVA included, with no subscription and credits that never expire. Weetrust’s calculator shows MXN $222 for 5 documents a month and $2,146 for 100, IVA included. CinCel’s Business plan is MXN $599 a month billed annually with 500 c.Docs, or $856 billed monthly with 42, before IVA. Legalario’s Essentials is MXN $6,700 a year before IVA for 120 documents and one user, rising to $29,000 for 600 documents and ten users on Premium.

Do I need NOM-151 for an electronic contract to be valid in Mexico?

No. NOM-151 is a retention and digitisation standard: the constancia de conservación it produces fixes a document’s date and integrity, which can be useful evidence. It is not a signature, and the Firma Electrónica of article 89 of the Código de Comercio, which makes a commercial contract between private parties binding, requires no constancia and no certificate. The full statutory text is in are electronic signatures legal in Mexico?

How do I check whether a provider is an accredited PSC?

Use the Secretaría de Economía’s own register, not the vendor’s description of itself — or ours. The PSC directory lists each accredited Prestador de Servicios de Certificación and the specific services it is accredited for, such as time stamps, data-message conservation or certificate issuance. A company can be accredited for one service and not another, and a platform may use a PSC it partners with rather than being one itself, so ask which PSC issues your constancias and check that name.

Which Mexican e-signature platform has no document limit?

None of the four on the usual shortlist sells unmetered sending on a published plan. Mifiel charges per signed document; Weetrust prices by documents per month; CinCel’s paid plans carry a c.Docs allowance, with unlimited c.Docs listed only as an annual add-on; Legalario states a yearly document allowance on every plan. Signatura prices per seat with unlimited documents, at MX$435 per seat per month on the annual plan — but it does not issue NOM-151 constancias or certificates.

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Sources: Mifiel precios — “Paga sólo lo que uses: Los créditos para documentos nunca expiran”, “Sin suscripción forzada”, “1 documento firmado = 1 crédito de documento”, the document packs from 10 at “$89” (“$890”) to 5,000 at “$12” (“$60,000”) with the note “Precios en MXN, IVA incluido. Los créditos no expiran.”, the identity-verification packs from “$21.88” to “$12.95” for signers “que no cuentan con e.firma”, “Firma electrónica avanzada incluida”, “Cumplimiento NOM-151 | Fecha cierta” and “la primera plataforma de firma electrónica en México”. Weetrust precios — “Paga por lo que usas”, “Membresía weetrust”, “Si consumes … documentos al mes”, “Total” “(IVA incluido)”, the calculator’s “mxn $222”, “mxn $890” and “mxn $2,146” at 5, 20 and 100 documents read in the browser, the included-features list, and “14 días de prueba (5 docs gratis)”. CinCel pricing — the “Anual” / “Mensual” toggle and “Ahorra hasta 30%”, Business “$599” “/mes” with “500 c.Docs” and “15 IDV” (annual) and “$856” with “42 c.Docs” (monthly), Business Pro “$1,799” with “1500 c.Docs” and “$2,570” with “125 c.Docs”, “Usuario ilimitados”, “Equipo ilimitados”, the free plan’s “3 c.Docs”, “c.Docs ilimitados (Plan anual)” as an add-on, “Precios en MXN sin IVA”, and “el 1er PSC en la Nube”. Legalario planes — the “Al mes” / “Al año” toggle and “Ahorra 20%”, Essentials “MXN $700” / “$558” “Cobro anual de $6,700 +IVA” for “120 documentos al año” and “1 usuario”, Starter “$1,600” / “$1,284” “$15,400” for “300 documentos al año” and “5 usuarios”, Premium “$3,000” / “$2,416” “$29,000” for “600 documentos al año” and “10 usuarios”, Premium’s “OCR INE”, “INE vs Selfie” and “Validación RENAPO”, and Corporativo for “más de 7,000 documentos al año”. Secretaría de Economía, directorio de PSC — the entry for Cincel Certificadora Digital S.A.P.I. de C.V. and its accredited services. Prices change without notice — check each vendor’s live page before relying on a number.