We've mentioned Logos for Mac before, but now there is Logos Bible Software for iPhone (iTunes link), a free app providing access to several translations of the Bible and other Bible study books (most of the ones available at http://bible.logos.com). That's pretty good.

If you create a free account at Logos.com, you gain access to even more free resources. That's even better.

The app also lets you set up reading lists, which is an excellent idea. I've read through the Bible twice in the past few years, and used Mobile Safari on my iPhone to keep up with online lists. This app would have been much easier to use.

Many of the free resources are older, but the English Standard Version (ESV) is a good and fairly modern translation. There are also comparison tools available, as well as dictionaries. (UPDATE: Ryan Burns from Logos.com added a complete list in the comments.)

I'm almost hesitant to mention this next feature. Here's the good news: the new Logos version 4 will work with the iPhone app, giving you access over the Internet to books that you have purchased. That's a pretty killer feature.

Here's the bad news: the Mac version of Logos 4 is not finished. (That sound you just heard was an angry mob of Mac users grabbing their pitchforks off the wall and looking for the kerosene to light their torches.) Logos is developed both for Windows and Mac, and the Windows version beat the Mac version out the door.

The developers explain that the underlying "core" works on both Windows and Mac, and that the pre-release version "reads and indexes the exact same resources and data files as the Windows version. It synchronizes with the server and even uploads and downloads notes, settings, and other data. It can automatically update itself over the Internet. It just needs work at the user interface level, and we're doing that as fast as we can."

They go on to explain that the Windows and iPhone versions are both ready, and delaying "wouldn't speed up the Mac product, it would just delay access for the larger group of users." They describe version 4 as "a completely new product." All of which is fairly reasonable, but unlikely to soothe the nerves of some Mac users who will no doubt feel like second-class citizens.

The iPhone app still offers a lot of functionality, even without Logos 4 integration, and it is completely free.

Do you have a favorite iPhone Bible study app? If so, please let us know in the comments. I realize a lot of you are not religious and may not have any use or affinity for this particular app, but it would be appreciated if you'd let others have a chance to discuss this.

I have been waiting for Logos for Mac, the Bible research application suite, for over a year. I take that back: I have been waiting for Logos for the Mac for over five years, when I first switched to Mac after a brief and unfortunate experience in the Windows world.

Before we go any further I must stop to address the fear which has already gripped many Mac users. Let me say this clearly: this is no hastily slapped together Mac "port" of a Windows application. In fact 15 seconds into the introductory video, they proudly announce: "What we've done for the Mac is rebuild it from the ground up."

You can tell.

Logos for Mac looks and feels like a native Mac application. How native? If you can copy a passage from Logos to Microsoft Word for Mac, it automatically creates a footnote in APA, BibTex, Chicago, Harvard, MLA, Refer-BiblX, RIS, SBL, or Turabian format (whichever you choose in the preferences). As someone who has no love for footnoting, this may be my favorite feature of any piece of software ever.

There are also Mac-specific support videos to help you learn to use the software and native Mac "Help" available in the application itself.

The Mac version does not support all of the Windows features, although they say they "plan to add many of these features in upcoming versions." You can see a list of some of those features on a chart of features covered at Camp Logos, a two-day training seminar for Logos users. The same page also makes it clear that they have been thinking about Mac users for these seminars, and in fact usually have someone there who is a Mac user to help if needed.

As TUAW's own Robert Palmer noted a few weeks ago, there are over 20 Bible applications available for iPhone. Some require an Internet connection to query an online Bible database, while others store the text on the device.

HANDiBIBLE (formerly Pocket Bible) is one of the latter apps, and is now available in the App Store (iTunes link). The developer, Jerry Beers, made an easily accessible (US$4.99) and usable Bible application and realizes that version 1.0 is just the start -- he welcomes feature requests.

At the present time, HANDiBIBLE provides an easy-to-use interface to a King James Version of both the Old and New Testaments. Readers pick which Testament they wish to read and a list of all of the books appears. Pick the book by tapping on it, and a set of scroll wheels appears which are used to set the Chapter and Verse. Tap go, and you're reading.

Since the developer has asked for feature requests, I'd suggest a word search mechanism and a New King James Version translation for readability. Despite these suggestions, HANDiBIBLE is a well-done and affordable Bible application for iPhone.

When I was going through a minor existential crisis a few years ago, I read the Bible from cover to cover. The copy I had was the rattiest, oldest paperback version I could find: I got it for two bucks at a library booksale.

The Bible app for iPhone and iPod touch, however, beats even that, because it's free. Bible is published by YouVersion.com, a social website for people reading the Bible that allows annotation and discussion of passages in the book.

Bible includes 13 English translations, three Spanish translations, and one translation each in French, German, and Simplified Chinese. It's searchable by term or location (chapter and verse), and includes a "daily read" tool that -- if you stick with it -- you can use to read the whole kit and kaboodle in a year.

There are more than 20 other Bible applications available in the App Store, costing as much as $30. The upshot is that some don't require an internet connection to view the text. (Thanks, commenters, for that one.) For example, Acro Bible NIV is $28.99, and includes only the New International Version. In this crowded category, there is also another app identically named "Bible," but it's $14.99.

There is also a free version of the Qur'an, called iQuran, available too. For the devout, there are web apps to help with prayer times as well, but no native iPhone app yet. As yet there isn't a full version of the Torah in the App Store, but there are both KosherMe (the mealtime blessings for $6.99) and Pocket Luach Lite (Jewish calendar conversion for $3.99).

Bible -- the YouVersion (uh) version -- is free, and available at the App Store.