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iPhone app · Sarper Labs

Plumbline: Bible Study

Read a short passage, write what stands out, choose one step to live it out and respond in prayer. Plumbline walks you through Scripture, Observation, Application and Prayer, and keeps your journal on your iPhone.

Download Plumbline: Bible Study on the App Store
  • Free to download
  • No account
  • Works offline

Published by Sarper Dijital Teknolojiler ve Kiralama A.Ş.

What you can do

  • Make Scripture personal

    Read a short passage, write what stands out, pick one step to live it out and respond in prayer.

  • A guide that asks

    An optional study guide asks thoughtful questions about the passage. It does not replace Scripture, your pastor or your church.

  • Your notes stay yours

    Your journal is encrypted on your iPhone. No account is needed.

  • Read and listen

    BSB, KJV and WEB, with search that works offline. Narration is available for the Lent readings.

  • Walk through Lent

    One passage a day from Ash Wednesday to Easter. Any day you missed is still there for you.

  • Share with your group

    Send a simple discussion guide to your small group. Your own notes and prayers stay private.

Scripture: Berean Standard Bible, King James Version and World English Bible (public domain).

See it in action

  • Study Scripture. Keep What Matters. A calm daily Bible study, one passage at a time.
  • Reflect With the SOAP Method: Scripture, Observation, Application, Prayer.
  • A Guide That Asks Questions: thoughtful prompts, not ready-made answers.
  • Your Notes Stay On Your iPhone: encrypted on device, no account needed.
  • Share the Verse. Keep Notes Private: verse cards to share, your prayers stay yours.
  • Look Back on Your Week: weekly recap, PDF export and small-group guides.

What is the SOAP Bible study method?

SOAP is a simple way to study a short Bible passage in four steps. It fits into a few quiet minutes, which is why many churches and small groups use it for daily devotions. Plumbline is built around it.

The four steps

  1. S: ScriptureRead a short Bible passage.
  2. O: ObservationWrite what stands out to you.
  3. A: ApplicationFind one way to live it out.
  4. P: PrayerRespond to God in your own words.

How Plumbline helps

  • A passage for today

    Start with “Abide”, a 21-day plan of short passages, or follow the daily Lent readings from Ash Wednesday to Easter.

  • Topics

    Passages for Peace, Forgiveness, Purpose, Fear, Gratitude and Grief.

  • A guide that asks

    The optional study guide asks questions about the passage. It does not give verdicts, speak for God or replace your church, and you can switch it off.

  • Private by design

    Your journal is encrypted on your iPhone and no account is needed. Your prayers are never sent anywhere.

Frequently asked questions

What does SOAP stand for?

Scripture, Observation, Application and Prayer: read a passage, write what stands out, choose one way to live it out and respond in prayer.

Do I need an account?

No. Plumbline works without an account, and your journal is encrypted on your iPhone.

Which Bible translations are included?

The Berean Standard Bible, King James Version and World English Bible, with search.

Does the study guide replace my pastor or church?

No. It only asks questions to help you reflect, it is optional, and you can turn it off in Settings.

Can I use it with my small group?

Yes. Send your group a simple discussion guide with the passage and four SOAP questions. Your own notes and prayers stay private.

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