
Abstract APIs
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mailboxlayer API
IBAN.com
VAT-calc.net
Melissa Data Quality
A powerful REST API for validating emails, IBANs, BIC/SWIFT codes, LEI, ISIN, credit cards, VAT numbers, phone numbers, and 70+ more validators. Free tier available.

Google App Engine
Salesforce Platform
Google Cloud Functions
Heroku
AWS Lambda
Azure Web Apps
CapRover
Docker powered mini-Heroku in around 100 lines of Bash

Which is more popular?
Based on our record, Dokku seems to be more popular. It has been mentioned 30 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | isvalid.dev | dokku.com |
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| Listed in |
In their own words, as submitted to SaaSHub.


IsValid is a validation API service for developers who need to quickly verify data formats without building their own validators. It offers 40+ endpoints covering financial identifiers (IBAN, BIC, ISIN, CUSIP), international standards (ISBN, ISSN), technology formats (UUID, JWT, QR codes),...
No description of Dokku yet.
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing IsValid.dev and Dokku.
IsValid.dev's answer
IsValid offers 70+ validators in a single API — covering financial identifiers (IBAN, BIC, ISIN, LEI), international standards (ISBN, ISSN), technology formats (UUID, JWT, QR codes), tax numbers (VAT, REGON, PESEL), credit cards, phone numbers, and more. No need to integrate multiple services for different data types.
IsValid.dev's answer
Most validation APIs focus on one category (email or phone). IsValid covers financial, regional, and technical formats all in one place with a consistent REST API. The free tier with 100 calls/day requires no credit card, and integration takes minutes.
IsValid.dev's answer
Developers and software teams building applications that handle user input, financial data, or international identifiers — particularly in fintech, e-commerce, and SaaS products.
IsValid.dev's answer
IsValid was built out of frustration with piecing together multiple validation libraries and services. The goal was a single, reliable API that handles the full range of data validation needs developers encounter in real-world applications.
IsValid.dev's answer
Next.js, Fastify, PostgreSQL, Docker
Share your experience with using IsValid.dev and Dokku. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


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Dokku is an open-source Heroku clone you can run on any VPS. It supports Heroku buildpacks and gives you complete control. Requires server administration skills.
Dokku is a great alternative if you’re working with a stringent budget. It’s a miniaturized self-hosted platform as a service. You can deploy applications to it using Git. Because it’s a Heroku derivative, it’s...
CapRover is in many ways similar to Dokku. It uses Docker for deployment just like Dokku but CapRover does not support buildpack deployments as it uses Dockerfiles only. This is not necessarily a bad thing since...
Recommendations tracked on public social media and blogs since March 2021.


Tracking IsValid.dev since Apr 2026.
This post compares the four self-hosted and "self-hosted-style" PaaS options we see startups evaluating most often: Coolify, Dokku, CapRover, and Ownkube. We'll cover what each one is, who it fits, where the ceiling is, and the honest... - Source: dev.to / 27 days ago
Dokku is the smallest PaaS implementation you've ever seen. It's a self-hosted Heroku alternative that runs on a single server. Push code with git push — Dokku builds, deploys, and manages your apps. - Source: dev.to / 6 months ago
I think that https://dokku.com/ is actually the closest to what you are building. - Source: Hacker News / 8 months ago
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Official company data from 50+ European business registers plus GLEIF LEI — one REST API for KYB, compliance and firmographic enrichment
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A serverless platform for building event-based microservices.
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