AssemblyFlow
Read the docs Download for Windows
By Straight Truth Press · v1.3.0 just released · Free for 50 or fewer

The worship service,
composed.

AssemblyFlow plans the order, projects the words on the screen, and runs the stage display — from a single Windows app. Built with a cappella singing in mind, with livestream integration that's a first-class citizen, not an afterthought.

Download for Windows v1.3.0 · 67 MB See what it does
  • Runs offline, on the church laptop
  • 85 shape-note SATB hymns included, ready to project
  • From $20/mo — or free for 50 or fewer members
AssemblyFlow—▢×
AssemblyFlow
by Straight Truth Press
85 songs loaded

Service Order

Add passage, e.g. John 3:16
Add Sermon PPT
2 items
  1. 1
    Service Begins …
    Countdown - Pre-service countdown
  2. 2
    A Mighty Fortr…
    Song - PPT - 16 visual slides
85 songs included
A curated hymnal of pre-rendered PowerPoint songs ships in the box. No setup, no licensing.
One-click project
Project, Standby, and Blackout — the three states a service ever needs.
Built for the way real services run
Windows 10/11
Multi-monitor
Phone remote
PowerPoint passthrough
CCLI reporting
3 bundled + many via API
One executable, three roles

One app, three modes — coordinated through a shared folder.

Run AssemblyFlow as the Planner on the booth laptop, as Projection on the sanctuary screen, and as Stage Display on the worship-team monitor. They talk to each other through plain JSON files on disk — no servers, no accounts, no cloud.

⧗Pre-service countdown
★Welcome & announcements
♪Great Are You Lord
✦Romans 8:28–30
▦Sermon — Predestined…
♪Doxology
Planner

The booth's command center.

Build the service order from seven item types, hold the run, tweak lyrics in real time, and drive the projection. The Planner is the only window that mutates state — everything else reads from it.

  • Drag-and-drop service order
  • Live lyric editor for any song
  • Per-item background & speaker-notes overrides
  • Autosaves every change
Great are You, Lord
It's Your breath in our lungs
So we pour out our praise
⏵ ◂ ▶ ▸ B
Projection

Borderless, fullscreen, no chrome.

What the congregation sees. A clean fullscreen window with hover-revealed controls, ~350ms cross-fades, and three blank modes — Standby with the AF logo, true blackout, and your custom Logo screen.

  • 9 themed backgrounds + custom images & videos
  • Cross-fade transitions between every slide
  • Standby · Blackout · Logo screen
  • ← → B Esc
SONG · 3 of 11
Great Are You Lord
10:47:12
+18:04
It's Your breath in our lungs
So we pour out our praise
To You only
UP NEXTBridge — "And it's our joy to sing…"
NOTESDrop band volume on bridge ×2. Cue lights blue.
Stage Display

What the worship team needs to see.

A second screen for the people on stage. Current slide in big text, UP NEXT preview, a live clock and elapsed-since-launch timer, and amber-bordered speaker notes only the team sees.

  • Large current-slide text
  • UP NEXT slide preview
  • Clock + elapsed timer
  • Speaker notes hidden from the audience
Service composition

Seven item types. Everything a Sunday needs.

Drop any of these onto the order, in any sequence. Every item supports a per-item background override and speaker notes for the worship team.

♪

Songs

Drawn from a local library of 85 pre-rendered PowerPoint songs cached as PNGs. Drag onto the order or click +.

verse
Holy, holy, holy / Lord God Almighty
✦

Scripture

Type a reference like John 3:16. The app validates against the active translation, then splits each verse onto its own slide.

Romans 8:28–30 ✓ BSV
v.28 And we know that for those who love God…
v.29 For those whom he foreknew…
v.30 And those whom he predestined…
▦

Sermon PowerPoint

Drop a .ppt or .pptx. AssemblyFlow drives PowerPoint via COM to render every slide to 1920×1080 PNGs — cached per file.

⧗

Pre-service countdown

Live-ticking timer to a target time. Quick presets from 5–60 minutes, or pick a clock time. Switches to "It's time!" at zero.

04:32
510153060
★

Announcement

Quick text-on-theme slides — Welcome, Tithe & Offering, Communion, Greet your neighbor. No PowerPoint required.

Tithe & Offering
Give online at our church website,
or use the box at the back.
▶

Video

Play a local MP4 or paste a YouTube URL — AssemblyFlow auto-downloads via yt-dlp and caches it for instant playback. Full-screen on the projection, audio routed through your OBS livestream.

Missionary Update — Sept 2026
4:188:30
▦

Image

Project a Canva design, photo, or announcement graphic — any PNG, JPG, WebP, BMP, or GIF. Drag-and-drop or pick via dialog; shows full-screen on the projection.

VBS-2026.png
◐

Drop in any background

Nine bundled themes plus any image or video you drag onto the window. Files are copied to data/backgrounds/ and rendered with a 45% darken overlay for legibility. Per-item overrides for that one communion song.

Aa
+
Bible translations

Three bundled. Many more with your free API keys.

Type a reference, hit Enter — every verse becomes its own slide, with the verse reference as the heading. Bad keys re-prompt automatically.

  • BSV Biblical Standard Version — translated & published by Straight Truth Press. Bundled, default, offline.
  • KJV King James Version — bundled, offline
  • ASV American Standard Version — bundled, offline
  • ESV via api.esv.org — free key, 5,000 verses/day, non-commercial
  • api.bible Starter — pick any 3 copyrighted Bibles (NIV, NASB, CSB, NLT, NKJV, The Message…) plus a deep library of Creative Commons & Public Domain versions, including many non-English languages. Free key, 5,000 calls/month, non-commercial.

All API responses are cached to disk, so re-using the same verse is instant — and works offline next time.

BSV KJV ASV ESV NIV
ROMANS 8:28
And we know that for those who love God all things work together for good, for those who are called according to his purpose.
ROMANS 8:29
For those whom he foreknew he also predestined to be conformed to the image of his Son…
ROMANS 8:30
And those whom he predestined he also called, and those whom he called he also justified…
9:41 ●●●  ▣
AssemblyFlow LIVE
SONG · 4 of 11
Great Are You Lord
It's Your breath in our lungs
Theme · Sanctuary Display 2
SONG · 4 of 11
Great Are You Lord
◂▸B
Web remote

Drive the screen from a phone in your pocket.

A built-in HTTP server, bound to your church Wi-Fi. Any phone, tablet, or laptop on the same network pulls up a mobile-first page — Prev/Next, blank, jump items.

  • Installable as a PWA on iOS & Android — gets the AF icon
  • Same command file the booth uses — state stays in one place
  • Bound to LAN IP — never leaves your network
Connect http://192.168.1.42:8788
CCLI reporting

Logs every song, generates the CSV.

Every time a song projects, AssemblyFlow appends a log entry with timestamp, song title, your CCLI metadata, and your church's license number. When the reporting window comes, export a CSV — already in the right shape.

CCLI is Christian Copyright Licensing International — the license most congregations carry to legally project copyrighted song lyrics. If your assembly sings a cappella from public-domain hymns only, you may not need one at all. The CCLI panel is hidden by default; turn it on once you've entered your license number.

Per-song metadataCCLI Song #, authors, copyright, publisher
Date-range reportsDefaults to last 6 months (CCLI biannual)
Missing-data warningsCatches blank CCLI numbers before submission
Local-onlyStored in data/ccli-usage/ — never sent anywhere
CCLI Usage Report · Jan 1 – Jun 30, 2026
DateSongCCLI #AuthorPublisher
2026-01-05Holy Forever7228369Tomlin, FurtickCapitol CMG
2026-01-05Great Are You Lord6460220Ingram, LeonardIntegrity
2026-01-12In Christ Alone3350395Getty, TownendThankyou Music
2026-01-12How Great Thou Art14181Boberg, HineManna Music
2026-01-19Doxologymissing——
2026-01-19King of Kings7127647Hastings, LigertwoodHillsong
2026-01-26Goodness of God7117726Johnson, JennBethel
52 services · 184 entries · 1 missing CCLI#
From the bench

An honest note instead of testimonials.

“AssemblyFlow is new, and we're not going to invent quotes from churches that don't exist. As real congregations start using it, we'll publish their notes here — with names attached, with permission, and only if they actually said it.”
STP
The AssemblyFlow team
Straight Truth Press

Using it? Email support@assemblyflow.net with a sentence or two about how it's working in your assembly — we'd love to include it.

Affordable for every church. Free for the smallest.

Standard is $20/month — flat rate, no attendance ladders. Congregations of 50 or fewer use the full app for free, honor system, no questions asked.

Download for Windows See pricing
Windows 10 · 11· v1.3.0 · 67 MB· Last updated June 2026