Useful tools, well made.
We make tax compliance guides for accountants that cite their official sources, a kit to roll out electronic invoicing in the Dominican Republic, and Carta del Amanecer (“Dawn Letter”), a daily letter with a Bible verse.
What we make
Our products are mostly in Spanish; the guides for Brazil are in Portuguese.
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Free · For accountants
Tax compliance guides
Guides with official sources and review dates on electronic invoicing (e-CF) in the Dominican Republic, VERI*FACTU in Spain, and the certidões needed to bid for public contracts in Brazil.
Read the guides -
Paid · For accounting firms
e-CF Kit
To roll out electronic invoicing in the Dominican Republic across a whole client portfolio, one client at a time, with official sources.
See the kit and its price on Gumroad -
Free · No ads
Carta del Amanecer
Every morning, a letter with a Bible verse, a reflection and a prayer, with no account needed. The Android app is in testing and will soon be on Google Play.
Visit Carta del Amanecer
How we work
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Sources in plain sight
Our tax guides include their official sources and review dates. In Carta del Amanecer, Bible verses are quoted word for word, with their reference and translation.
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No ads, no tracking
Our websites and our app show no ads and carry no analytics or trackers. When we advertise the guides on Google, visitors arrive at the same website, with no tracking pixels.
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Clear prices
The guides and Carta del Amanecer are free and need no account. The kit’s price and options are shown on Gumroad before you buy.
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Made with AI, reviewed before publishing
We use artificial intelligence to research, write and code. Before anything is published, a second AI model from a different maker reviews it and a person signs off. If you find a mistake, tell us.
Why “Celdilla”
In Spanish, a celdilla is one of the six-sided cells of a honeycomb. No cell makes the honeycomb on its own, but each one is well made and fits with the others. That is how we want to work: small, useful pieces that together hold up something bigger.