Free forever: the Bible, the commentaries and your notes. No ads.
On all your devices
Theodidaktos on a computer, an iPad, a foldable and a phone
Computer
On the computer, room to spread out.
Up to four panels at once: the Bible, the commentary and your notes, in sync.
iPad
On iPad, your notes in the margin.
With room to spare, your notes and references sit beside their verse.
Foldable
On a foldable, it opens like a book.
Closed, it is a phone. Open, two pages.
Phone
One study on every screen you own.
What you mark on one shows up on the rest.
What's new in 6.0
Six things that change how you read
01Read
Every chapter opens like the page of a book.
Print-quality type, generous line spacing and the width you choose. When you finish, the next chapter is already waiting below.
02Ask
Ask. It answers from your books.
The assistant searches your commentaries and dictionaries and tells you where each point comes from. If your library does not say it, it does not make it up.
03Pro
Mark the text by hand.
Circles, boxes, stars and arrows over the words, just like in your paper Bible.
04Margin
Your notes, in the margin.
Your notes and cross-references beside their verse, on the phone too.
05Plus
By day, Paper. By night, Lamp.
Book paper with grain, or amber light for reading in the dark without tiring your eyes.
06Every day
Read every day with Tola.
A plan at your pace and the week's streak. Miss a day and the plan adjusts.
Plans
The essentials, free. Plus and Pro, if you want more.
Paying for a plan keeps the app going for everyone. Seven-day free trial on Plus and Pro, cancel whenever you like.
Plans are activated in the app. Prices may vary by country and store.
Your library
A serious library, not a shop window.
Eight kinds of resources, all free and all linked to each other. If a commentary cites a verse, one tap opens it. If you need something more specific, you import it yourself.
* Availability of specific versions depends on license and region. Some modern Bibles cannot be distributed because of copyright. For those, you import your own module in seconds.
How the library works
Straight with you: this is how you get access to everything.
We do not promise what we cannot give. Here is exactly how Theodidaktos puts together a serious Bible study library, and why it really is free.
01
Open access · no permission needed
Resources in the public domain
Hundreds of classic works that no longer need a license.
Ready to use on day one
No cards, no fees, no catch
More works added every month
02
Your library, your call
Import your own modules
Have the NIV, ESV or NLT in MySword?
MySword (.bbl · .cmt · .dct · .bok)
e-Sword (.bblx · .cmtx · .dctx · .refx)
ePub coming soon
Why we do it this way
Newer Bibles and books carry copyrights we cannot redistribute for free…
0+
Free classic works, ready when you install
+
∞
Modules you import from MySword or e-Sword
=
Your library
No paying twice. No asking anyone for permission.
Features that change everything
More than a digital Bible. A complete study desk.
From the finest highlight to a study workspace synced across all your devices. These are the tools that make Theodidaktos a complete study app.
Synced study workspaces
Up to 4×2 panels: Bible, commentary, dictionary, notes. Save the whole workspace and open it exactly as you left it on your phone, tablet or the web.
RVR1960
Rom 8:28
And we know that all things work together for good…
Henry · MH
Romans 8
The golden chain of salvation…
Strong G4903
sunergéo
To work together, to cooperate…
My note
Mar 15
Five unbreakable links…
Synced · iPhone, iPad, Mac, web
Greek and Hebrew interlinear
The original text with morphology, roots and occurrences. Tap any word for its Strong's number, every occurrence in the canon and a literal translation.
Highlights with notes
Create your own highlight styles with a name and a color. Add notes to each highlight. They work in books and commentaries too.
Audio for any resource
Listen to the Bible, commentaries, books and devotionals in a natural voice. On the way to work, at the gym or in the kitchen.
Zen mode for books
Full screen, editorial typography, Kindle-style highlighting. For the books that deserve your full attention.
Linked resources
If a commentary cites a verse, one tap opens it. If a book points to another resource, it jumps there. Your library talks to itself.
AI with verifiable citations
Summaries, Q&A, semantic search, commentary comparison. It always cites the source. It does not preach and does not make things up.
Version comparison
KJV, ESV, NIV, NLT and more, side by side. To see any passage from several angles.
Smart global search
One box. Search by idea, exact word or reference across all your resources: Bibles, commentaries, books and notes.
Devotionals with notifications
Spurgeon, Tozer, Lloyd-Jones. They arrive at the time you choose. No pressure, no spam.
Gamified plans
Bible in a year, overview and chronological plans. Streaks, achievements and visible progress to keep you going.
TOPOO guides
Step-by-step guided studies by book, topic or character. Made for people just starting out, and for people who already teach.
12 reading themes
Six dark, six light. Sepia, high contrast, rose petal, ivory, forest… Change the fonts and the accent color.
Works offline
Download whole Bibles, commentaries and books and read them on a plane, at a retreat or wherever there is no signal.
Import what you have
Works with MySword and e-Sword modules. Coming soon: ePub. Your resources upload once and follow you to all your devices.
Publish and export
Share your studies with your church. Export as an image for Instagram, WhatsApp or Facebook, or as a PDF for your team.
For study
A seminary's tools, in your pocket.
Greek and Hebrew
The word as it was written.
Every word of the original with its transliteration, its Strong's number and what it means. One tap opens the lexicon.
Ask
It answers, and shows you where from.
The assistant searches your commentaries and dictionaries, builds word studies, timelines and comparisons, and cites every source. If your library does not say it, it does not make it up.
Compare
Several versions, one verse.
KJV, ESV, NIV and any you have, side by side with the differences marked.
For every reader
One tool. Three depths.
Theodidaktos grows with you. The teenager opening the Bible for the first time and the pastor writing the tenth sermon of the week use the same app, each with the tools they need.
For young people
Hungry for the Word, with tools that fit you.
For laypeople
Get ready to teach the gospel.
For pastors and ministers
The complete library to preach and disciple.
Renewed themes in 6.0
Find the tone that won't tire you.
Each theme brings its own paper, ink and colour, chosen together for long reading. Eight dark and eight light; Paper and Lamp come with Plus.
KJV · Bible
Psalm 23
Aa
⌕
⋮
23
The Lord is my shepherd
1The LORD is my shepherd; I shall not want.
2He maketh me to lie down in green pastures: he leadeth me beside the still waters.
3He restoreth my soul: he leadeth me in the paths of righteousness for his name's sake.
4Yea, though I walk through the valley of the shadow of death, I will fear no evil: for thou art with me.
Dark mode
Classic
Ink blue with a gold accent. The signature look.
And also:
Midnight, Purple, Rose Night, Contrast, Ivory, Rose Petal.
Comparison
The tools of serious study. Without the bill.
Next to the most popular study apps, this is what you get today in the free version, with direct sign-up and no card.
Feature
Theodidaktos
Logos
YouVersion
e-Sword
* YouVersion is free, but its study model is different: built around devotional plans, not academic study. Comparison based on public versions as of Apr. 2026.
On the web too
Your library, open in four panels. One screen.
The web app takes its cues from the mobile app and speaks the same language: the same panels, the same themes, the same notes. Synced live.
📖 Study: Romans 8+ New panel
4 panelsSynced
KJV · Bible
Romans 8:28-30
↓ Synced
28And we know that all things work together for good to them that love God, to them who are the called according to his purpose.
29For whom he did foreknow, he also did predestinate to be conformed to the image of his Son…
30Moreover whom he did predestinate, them he also called: and whom he called, them he also justified: and whom he justified, them he also glorified.
Matthew Henry · Commentary
Romans 8
The apostle closes the chapter with the golden chain of salvation: foreknowledge, predestination, calling, justification, glorification. What God begins, God finishes.
Verse 28 does not claim that all things are good, but that they work together for good…
Strong's Dictionary
G4903 · sunergéo
συνεργέω
To work together, cooperate, contribute. From sun- (with) + érgon (work). 5 occurrences in the NT. See Mark 16:20, 1 Cor 16:16, 2 Cor 6:1, Jas 2:22.
My note
Mar 15 · Romans 8
Editing
The golden chain of salvation
Five unbreakable links: foreknew → predestined → called → justified → glorified. Not one aorist verb stops halfway.
Start today · free
Open your Bible with the right tools.
Create your account in under a minute. No card, no trial fee, no fine print. If we ever charge for something, it will not be for reading.
