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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.

Day One
Journey
REFLECTLY
Diaro
Stoic.
Bearable App
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Daylio enables you to keep a private diary without having to type a single line.

Which is more popular?
Website, pricing, platforms and company facts side by side.
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| Website | isvalid.dev | daylio.net |
| Pricing | — | |
| Platforms | — | |
| Company | — | Startup from the Czech Republic |
| 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 Daylio yet.
What each product offers, as listed by its team.


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Why this product is good
Recommended for
Overall verdict
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Daylio Mood App: Review
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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 Daylio.
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
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A journal entry in Daylio captures your mood and activities for each day. Best of all, there is absolutely no typing (unless you really want to add supplementary notes). Pick your mood by selecting one of five smiley...
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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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