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ABOUT

What this siddur is and how it decides things

What This Is

A siddur for people who are learning to daven. Every prayer is in Hebrew, in transliteration, and in English, and every page is split into levels so you can learn a service a piece at a time instead of facing forty pages at once. The blue lines tell you what to do with your body on the exact word where you do it: stand, bow, take three steps, hold the tzitzit. The amber lines are the words that change with the season or the day, and the site switches them on and off for you from the date.
It is free, there is no account, and nothing you do here is sent anywhere. What you mark as known, the level you are on, and your city are stored on your own device only.

Whose Customs

The text is Nusach Ari as printed in the Chabad siddur, Tehillat Hashem. The rules for what is said and not said on a given day - Tachanun, tefillin on Chol HaMoed, Hallel, the Amidah insertions - follow Chabad custom as recorded in Sefer HaMinhagim and the Alter Rebbe's Shulchan Aruch, with Chabad.org as the reference for anything those do not settle.
One exception. The Selichot page follows the Edot HaMizrach custom of saying Selichot every morning from 2 Elul through Yom Kippur, because that is the custom of the family this siddur was first built for.
This site is a learning tool. It is not a rav. Where a real question comes up - you forgot an insertion, you are not sure whether today counts, someone in the house is in mourning - ask a rav. The section "If You Got It Wrong" on the Daily page gives the standard rules for the most common Amidah mistakes and says plainly where its rules stop.

How the Dates and Times Are Computed

The Hebrew date comes from your device's own calendar, and the Jewish day begins at nightfall, so after nightfall the site already shows tomorrow's date and says so. Nightfall itself, and every other time on the Today page, is computed on your device from sunrise and sunset for your city. No server is involved, so the times work with no signal.
The definitions are the ones Chabad.org publishes in "About Our Zmanim Calculations":
Dawn (alot hashachar)sun 16.9° below the horizon
Earliest tallit and tefillin (misheyakir)10.2°
Sunrise and sunset0.833°, sea level
True sunrise and sunset (the Alter Rebbe)1.583°
A proportional hour(true sunset − true sunrise) ÷ 12
Latest Shematrue sunrise + 3 proportional hours
Latest Shacharit+ 4
Midday+ 6
Earliest Mincha+ 6.5
Plag haminchatrue sunset − 1.25
Nightfall (tzeit hakochavim)6°
Shabbat ends, Yom Tov ends, fast ends8.5°
Candle lighting18 minutes before sunset
The sun calculation is the standard NOAA one and agrees with published tables to about a minute at the center of a city. At the far edge of a large metro it can be two or three minutes off, so for Shabbat candle lighting go by the time your own community publishes. There is no elevation adjustment. Far enough north that the sun never gets 16.9° below the horizon in summer, the missing times fall back to fixed minutes and the Today page says so.
Your city is guessed from your device's time zone. If the guess is wrong, "change city" under the times on the Today page offers a list, or your device's own location, rounded so it does not identify your house. The molad announced on Shabbat Mevarchim and the Kiddush Levana window are computed from the traditional molad reckoning and match the standard published values.

What Is Not Here Yet

Yom Kippur, Sukkot, Chanukah, Purim and Pesach pages, Tehillim, Hallel, the Shabbat Musaf and the rest of the Shabbat davening, and Kiddush Levana. The Today page routes you to each one as it lands. Until then, use a printed siddur or the Chabad app for those.
The vowels were typed by hand and checked against the printed siddur, but a rav has not yet reviewed every line. If you find a mistake, tell whoever sent you this page, so it gets fixed for everyone.